LTM8026fb

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LTM802636VIN, 5A CVCC Step-Down µModule RegulatorFeaTures

n n n nDescripTion

The LTM®8026 is a 36VIN, 5A constant-voltage, constant- current (CVCC) step-down µModule® regulator. Included in the package are the switching controller, power switches, inductor and support components. Operating over an input voltage range of 6V to 36V, the LTM8026 supports an output voltage range of 1.2V to 24V. CVCC operation allows the LTM8026 to accurately regulate its output current up to 5A over the entire output range. The output current can be set by a control voltage, a single resistor or a thermistor. Only resistors to set the output voltage and frequency and the bulk input and output filter capacitors are needed to finish the design.The low profile package (2.82mm) enables utilization of unused space on the bottom of PC boards for high density point-of-load regulation. The LTM8026 is packaged in a thermally-enhanced, compact (11.25mm × 15mm) and low profile (2.82mm) overmolded land grid array (LGA) package suitable for automated assembly by standard sur-face mount equipment. The LTM8026 is RoHS compliant. L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 7199560, 7321203 and others pending.Complete Step-Down Switch Mode Power SupplyConstant-Voltage Constant-Current OperationSelectable Output Current Up to 5AParallelable for Increased Output Current, Even from Different Voltage Sourcesn Wide Input Voltage Range: 6V to 36Vn 1.2V to 24V Output Voltagen Selectable Switching Frequency: 100kHz to 1MHzn (e4) RoHS Compliant Package with Gold Pad Finishn Programmable Soft-Startn Tiny, Low Profile (11.25mm × 15mm × 2.82mm) Surface Mount LGA PackageapplicaTions

SuperCap Chargingn General Purpose Industrial n Extreme Short-Circuit Protection or Accurate Output Current Limitn µController-Based Battery Chargingn High Power LED Driven Multiple Input, Single Output Voltage ConversionnTypical applicaTion

Typical ApplicationVIN

6V TO 36V

LTM8026VINVOUTRUNSSSYNCCOMPRT90.9kVREFCTL_ICTL_TGNDADJ9.09k100µFVOUT2.5V5A

3.02.5OUTPUT VOLTAGE (V)2.01.51.00.5

8026 TA01aVOUT vs IOUT, 12VIN10µF510k+330µF0

2345OUTPUT CURRENT (A)

8026 TA01b

8026fbFor more information www.linear.com/LTM80261LTM8026absoluTe MaxiMuM raTings

(Note 1)pin conFiguraTion

TOP VIEWCOMPCLT_TCLT_IVREFADJSSRTVIN ............................................................................40VADJ, RT, COMP, CTL_I, CTL_T, VREF...........................3VVOUT..........................................................................25VRUN, SYNC, SS ...........................................................6VCurrent Into RUN Pin ............................................100µAInternal Operating Temperature Range ..–40°C to 125°CSolder Temperature ...............................................245°CStorage Temperature..............................–55°C to 125°C87654321ABCDEFGHJBANK 1VOUTBANK 3VINKLBANK 2 GNDSYNCRUNLGA PACKAGE81-LEAD (15mm × 11.25mm × 2.82mm) TJMAX = 125°C, θJA = 18.6°C/W, θJC(bottom) = 5.4°C/W, θJB = 5.6°C/W, θJC(top) = 10.8°C/W WEIGHT = 1.4g, θ VALUES DERIVED FROM A 4-LAYER 7.62cm × 7.62cmorDer inForMaTion

LEAD FREE FINISHLTM8026EV#PBFLTM8026IV#PBFLTM8026MPV#PBFTRAYLTM8026EV#PBFLTM8026IV#PBFLTM8026MPV#PBFPART MARKING*LTM8026VLTM8026VLTM8026VPACKAGE DESCRIPTION81-Lead (15mm × 11.25mm × 2.82mm) LGA81-Lead (15mm × 11.25mm × 2.82mm) LGA81-Lead (15mm × 11.25mm × 2.82mm) LGATEMPERATURE RANGE (NOTE 3)–40°C to 125°C–40°C to 125°C–55°C to 125°CConsult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.For more information on lead free part marking, go to: http://www.linear.com/leadfree/ This product is only offered in trays. For more information go to: http://www.linear.com/packaging/8026fb2For more information www.linear.com/LTM8026LTM8026elecTrical characTerisTics PARAMETERMinimum Input VoltageOutput DC VoltageOutput DC CurrentQuiescent Current Into VINLine RegulationLoad RegulationOutput RMS Voltage RippleSwitching FrequencyVoltage at ADJ PinCurrent Out of ADJ PinRUN Pin CurrentRUN Threshold Voltage (Falling)RUN Input HysteresisCTL_I Control RangeCTL_I Pin CurrentCTL_I Current Limit AccuracyCTL_T Control RangeCTL_T Pin CurrentCTL_T Current Limit AccuracyVREF VoltageSS Pin CurrentSYNC Input Low ThresholdSYNC Input High ThresholdSYNC Bias CurrentCTL_T = 1.5V CTL_T = 0.75V0.5mA Load(Note 4)fSYNC = 400kHzfSYNC = 400kHzSYNC = 0V1.215.1 2.241.89–110.65.6 2.8CTL_I = 1.5V CTL_I = 0.75V5.1 2.2405.6 2.80IOUT = 1A, RADJ Open IOUT = 1A, RADJ = 499Ω6V < VIN < 36V, VOUT = 3.3VRUN = 0V No Load 6V < VIN < 36V, IOUT = 1A VIN = 12V, 0A < IOUT < 5A VIN = 12V, IOUT = 4.5ART = 40.2k RT = 453k ADJ = 0V, VOUT = 1V RUN = 1.45V 1.47lThe l denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25°C. RUN = 3V, unless otherwise noted. (Note 3)CONDITIONSlMINTYP1.2 24MAX6UNITSVV V00.1 20.10.7101000 1001.161.191005.51.5513053 4AµA mA%%mVkHz kHz1.22VµAµA1.631.51.56.1 3.361.51.56.1 3.362.04VmVVµAA AVµAA AVµAVVµANote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.Note 2: This µModule regulator includes overtemperature protection that is intended to protect the device during momentary overload conditions. Internal temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum internal operating junction temperature may impair device reliability.Note 3: The LTM8026E is guaranteed to meet performance specifications from 0°C to 125°C internal operating temperature. Specifications over the full –40°C to 125°C internal operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM8026I is guaranteed to meet specifications over the full –40°C to 125°C internal operating temperature range. The LTM8026MP is guaranteed to meet specifications over the full –55°C to 125°C internal operating temperature range. Note that the maximum internal temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors.Note 4: Current flows out of pin.8026fbFor more information www.linear.com/LTM80263LTM8026TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.1.2VOUT Efficiency vs Output Current 908580EFFICIENCY (%)EFFICIENCY (%)7570656055500143OUTPUT CURRENT (A)

26VIN12VIN24VIN36VIN58026 G01

Typical perForMance characTerisTics

1.5VOUT Efficiency vs Output Current9085807570656055500143OUTPUT CURRENT (A)

26VIN12VIN24VIN36VIN58026 G02

1.8VOUT Efficiency vs Output Current908580EFFICIENCY (%)7570656055500143

OUTPUT CURRENT (A)

26VIN12VIN24VIN36VIN58026 G03

2.5VOUT Efficiency vs Output Current959085EFFICIENCY (%)EFFICIENCY (%)807570656055500

OUTPUT CURRENT (A)

6VIN12VIN24VIN36VIN5

8026 G04

3.3VOUT Efficiency vs Output Current959085

EFFICIENCY (%)807570656055500

OUTPUT CURRENT (A)

6VIN12VIN24VIN36VIN5

8026 G05

5VOUT Efficiency vs Output Current959085807570656055500

OUTPUT CURRENT (A)

12VIN24VIN36VIN5

8026 G06

8VOUT Efficiency vs Output Current1009590EFFICIENCY (%)EFFICIENCY (%)85807570656055500143

OUTPUT CURRENT (A)

212VIN24VIN36VIN58026 G07

12VOUT Efficiency vs Output Current95908580757065600143

OUTPUT CURRENT (A)

224VIN36VIN58026 G08

18VOUT Efficiency vs Output Current1009590EFFICIENCY (%)85807570650143OUTPUT CURRENT (A)

224VIN36VIN58026 G09

8026fb4For more information www.linear.com/LTM8026LTM8026Typical perForMance characTerisTics

TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.24VOUT Efficiency vs Output Current10095EFFICIENCY (%)EFFICIENCY (%)9085807570

90858075706560

28VIN36VIN0143OUTPUT CURRENT (A)

258026 G10

TA = 25°C, unless otherwise noted.–5VOUT Efficiency vs Output Current908580EFFICIENCY (%)12VIN24VIN33VIN7570656055

8026 G11

–3.3VOUT Efficiency vs Output Current55500143

OUTPUT CURRENT (A)

250

12VIN24VIN31VIN0143OUTPUT CURRENT (A)

258026 G12

–8VOUT Efficiency vs Output Current908580EFFICIENCY (%)EFFICIENCY (%)7570656055500143

OUTPUT CURRENT (A)

212VIN24VIN28VIN58026 G13

–12VOUT Efficiency vs Output Current90858075706560

INPUT CURRENT (A)1.61.41.21.00.80.60.4

12VIN24VIN00.511.522.53

3.58026 G14

Input Current vs Output Current 1.2VOUT6VIN12VIN24VIN36VIN0.200143

OUTPUT CURRENT (A)

258026 G15

OUTPUT CURRENT (A)

Input Current vs Output Current 1.5VOUT1.81.61.4INPUT CURRENT (A)1.21.00.80.60.40.200143

OUTPUT CURRENT (A)

8026 G16

Input Current vs Output Current 1.8VOUT2.01.81.6INPUT CURRENT (A)1.41.21.00.80.60.40.200143

OUTPUT CURRENT (A)

8026 G17

Input Current vs Output Current 2.5VOUT3.02.5INPUT CURRENT (A)2.01.51.00.50

6VIN12VIN24VIN36VIN6VIN12VIN24VIN36VIN6VIN12VIN24VIN36VIN01234OUTPUT CURRENT (A)

58026 G18

8026fbFor more information www.linear.com/LTM80265LTM8026Typical perForMance characTerisTics

TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.Input Current vs Output Current 3.3VOUT6VIN12VIN24VIN36VININPUT CURRENT (A)3.53.0INPUT CURRENT (A)2.52.01.51.00.5001234OUTPUT CURRENT (A)

58026 G19

4.03.53.02.52.01.51.00.50

Input Current vs Output Current 5VOUT8VIN12VIN24VIN36VININPUT CURRENT (A)4.03.53.02.52.01.51.00.5

01234OUTPUT CURRENT (A)

58026 G20

Input Current vs Output Current 8VOUT12VIN24VIN36VIN0

01234OUTPUT CURRENT (A)

58026 G21

Input Current vs Output Current 12VOUT4.54.03.5INPUT CURRENT (A)3.02.52.01.51.00.500

234OUTPUT CURRENT (A)

8026 G22

15VIN24VIN36VININPUT CURRENT (A)4.54.03.53.02.52.01.51.00.50

Input Current vs Output Current 18VOUT22VIN24VIN36VININPUT CURRENT (A)4.03.53.02.52.01.51.00.5

01234OUTPUT CURRENT (A)

58026 G23

Input Current vs Output Current 24VOUT28VIN36VIN0

234OUTPUT CURRENT (A)

8026 G24

Input Current vs Input Voltage (Output Shorted)700600INPUT CURRENT (mA)INPUT CURRENT (A)50040030020010000

INPUT VOLTAGE (V)

8026 G25

Input Current vs Load Current –3.3VOUT1.61.41.21.00.80.60.40.2

12VIN24VIN32.5VININPUT CURRENT (A)2.01.81.61.41.21.00.80.60.40.2

Input Current vs Load Current –5VOUT12VIN24VIN31VIN3040

0143

OUTPUT CURRENT (A)

258026 G26

0143

OUTPUT CURRENT (A)

258026 G27

8026fb6For more information www.linear.com/LTM8026LTM8026Typical perForMance characTerisTics

TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.Input Current vs Load Current –8VOUT3.02.5INPUT CURRENT (A)2.01.51.00.50

12VIN24VIN28VININPUT CURRENT (A)3.53.02.52.01.51.00.5

01234OUTPUT CURRENT (A)

58026 G28

Input Current vs Load Current –12VOUT12VIN24VININPUT VOLTAGE (V)Minimum Required Input Running Voltage vs Negative Output Voltage25

IOUT = 4AIOUT = 3AIOUT = 2AIOUT = 1A20

01234OUTPUT CURRENT (A)

58026 G29

–5–10OUTPUT VOLTAGE (V)

–15

8026 G30

Minimum Required Input Running Voltage vs Output Voltage, IOUT = 5A3025INPUT VOLTAGE (V)6.2

20151050

5.6INPUT VOLTAGE (V)6.4

Minimum Required Input Voltage vs Load 3.3VOUT and Below7.2

Minimum Required Input Voltage vs Load 5VOUT7.0INPUT VOLTAGE (V)6.06.8

5.86.6

101520OUTPUT VOLTAGE (V)

2530

8026 G31

LOAD CURRENT (A)

8026 G32

6.4

LOAD CURRENT (A)

8026 G33

10.0

Minimum Required Input Voltage vs Load 8VOUT14.414.2INPUT VOLTAGE (V)14.013.813.613.413.2

Minimum Required Input Voltage vs Load 12VOUT21.5

Minimum Required Input Voltage vs Load 18VOUT9.8INPUT VOLTAGE (V)21.0INPUT VOLTAGE (V)0

8026 G35

9.620.5

9.420.0

9.219.5

9.0

LOAD CURRENT (A)

8026 G34

23LOAD CURRENT (A)

19.0

23LOAD CURRENT (A)

8026 G36

8026fbFor more information www.linear.com/LTM80267LTM8026Typical perForMance characTerisTics

TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.Minimum Required Input Voltage vs Load 24VOUT28.0

3530INPUT VOLTAGE (V)252015105

23LOAD CURRENT (A)

8026 G37

Minimum Required Input Voltage vs Load –3.3VOUTTO STARTRUN CONTROLLEDTO RUNINPUT VOLTAGE (V)3530252015105

8026 G38

Minimum Required Input Voltage vs Load –5VOUTTO STARTRUN CONTROLLEDTO RUN27.5INPUT VOLTAGE (V)27.0

26.5

26.0

25.500

012345

8026 G39

LOAD CURRENT (A)LOAD CURRENT (A)

Minimum Required Input Voltage vs Load –8VOUT3025INPUT VOLTAGE (V)20151050

TO STARTRUN CONTROLLEDTO RUNINPUT VOLTAGE (V)302520151050

Minimum Required Input Voltage vs Load –12VOUTTO STARTRUN CONTROLLEDTO RUNTEMPERATURE RISE (°C)6050403020100

Temperature Rise vs Load Current 2.5VOUT36VIN24VIN12VIN6VIN0123458026 G40

012LOAD CURRENT (A)

348026 G41

0123458026 G42

LOAD CURRENT (A)LOAD CURRENT (A)

Temperature Rise vs Load Current 3.3VOUT6050TEMPERATURE RISE (°C)403020100

36VIN24VIN12VIN6VIN7060TEMPERATURE RISE (°C)5040302010

0123458026 G43

Temperature Rise vs Load Current 5VOUT36VIN24VIN12VIN7VIN9080TEMPERATURE RISE (°C)70605040302010

0123458026 G44

Temperature Rise vs Load Current 8VOUT36VIN24VIN12VIN00

LOAD CURRENT (A)LOAD CURRENT (A)

LOAD CURRENT (A)

8026 G45

8026fb8For more information www.linear.com/LTM8026LTM8026Typical perForMance characTerisTics

TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.Temperature Rise vs Load Current 12VOUT120100TEMPERATURE RISE (°C)806040200

36VIN24VIN15VINTEMPERATURE RISE (°C)120100806040200

Temperature Rise vs Load Current 18VOUT36VIN24VINTEMPERATURE RISE (°C)100908070605040302010

Temperature Rise vs Load Current 24VOUT36VIN28VIN012345

8026 G46

012345

8026 G47

01LOAD CURRENT (A)LOAD CURRENT (A)

LOAD CURRENT (A)

458026 G48

Temperature Rise vs Load Current –3.3VOUT7060TEMPERATURE RISE (°C)504030201000123458026 G49

Temperature Rise vs Load Current –5VOUT8070TEMPERATURE RISE (°C)6050403020100013LOAD CURRENT (A)

2458026 G50

12VIN32.5VIN24VIN12VIN31VIN24VINTEMPERATURE RISE (°C)9080706050403020100

Temperature Rise vs Load Current –8VOUT12VIN28VIN24VIN01

LOAD CURRENT (A)

8026 G51

Temperature Rise vs Load Current –12VOUT120100TEMPERATURE RISE (°C)806040200

24VIN12VIN500450400350RT VALUE (kΩ)012LOAD CURRENT (A)

8026 G52

Switching Frequency vs RT Value30025020015010050

340

0.20.60.80.4

SWITCHING FREQUENCY (MHz)

1.0

8026 G53

8026fbFor more information www.linear.com/LTM80269LTM8026Typical perForMance characTerisTics

TA = 25°C, unless otherwise noted. Configured per Table 1, where applicable.CTL_I Voltage vs Load Current, CTL_T = 2V2.5

2.5

CTL_T Voltage vs Load Current, CTL_I = 2V2.0

CTL_T VOLTAGE (V)CTL_I VOLTAGE (V)2.0

1.51.5

1.01.0

0.50

342

LOAD CURRENT (A)

8026 G54

342

LOAD CURRENT (A)

8026 G55

pin FuncTions

VOUT (Bank 1): Power Output Pins. Apply the output filter capacitor and the output load between these pins and GND pins.GND (Bank 2): Tie these GND pins to a local ground plane below the LTM8026 and the circuit components. In most applications, the bulk of the heat flow out of the LTM8026 is through these pads, so the printed circuit design has a large impact on the thermal performance of the part. See the PCB Layout and Thermal Considerations sections for more details. Return the feedback divider (RADJ) to this net. VIN (Bank 3): The VIN pins supply current to the LTM8026’s internal regulator and to the internal power switches. These pins must be locally bypassed with an external, low ESR capacitor; see Table 1 for recommended values.CTL_T (Pin D8): Connect a resistor/NTC thermistor network to the CTL_T pin to reduce the maximum regulated output current of the LTM8026 in response to temperature. The maximum control voltage is 1.5V. If this function is not used, tie this pin to VREF .CTL_I (Pin E8): The CTL_I pin reduces the maximum regulated output current of the LTM8026. The maximum control voltage is 1.5V. If this function is not used, tie this pin to VREF .VREF (Pin F8): Buffered 2V Reference Capable of 0.5mA Drive.RT (Pin G8): The RT pin is used to program the switching frequency of the LTM8026 by connecting a resistor from this pin to ground. The Applications Information section of the data sheet includes a table to determine the resis-tance value based on the desired switching frequency. When using the SYNC function, apply a resistor value equivalent to 20% lower than the SYNC pulse frequency. Do not leave this pin open.COMP (Pin H8): Compensation Pin. This pin is generally not used. The LTM8026 is internally compensated, but some rare situations may arise that require a modification to the control loop. This pin connects directly to the PWM comparator of the LTM8026. In most cases, no adjustment is necessary. If this function is not used, leave this pin open.8026fb10For more information www.linear.com/LTM8026LTM8026pin FuncTions

SS (Pin J8): The Soft-Start Pin. Place an external capacitor to ground to limit the regulated current during start-up conditions. The soft-start pin has an 11µA charging current.ADJ (Pin K8): The LTM8026 regulates its ADJ pin to 1.19V. Connect the adjust resistor from this pin to ground. The value of RADJ is given by the equation: 11.9

RADJ=

VOUT–1.19

higher than the absolute maximum voltage of 6V through a resistor, provided the pin current does not exceed 100µA. Do not leave this pin open. It may also be used to imple-ment a precision UVLO. See the Applications Information section for details.SYNC (Pin L7): Frequency Synchronization Pin. This pin allows the switching frequency to be synchronized to an external clock. The RT resistor should be chosen to oper-ate the internal clock at 20% lower than the SYNC pulse frequency. This pin should be grounded when not in use. Do not leave this pin floating. When laying out the board, avoid noise coupling to or from the SYNC trace. See the Synchronization section in Applications Information.where RADJ is in kΩ.RUN (Pin L6): The RUN pin acts as an enable pin and turns on the internal circuitry. The RUN pin is internally clamped, so it may be pulled up to a voltage source that is block DiagraM

VIN2.2µHRSENSEVOUT0.2µF10k2.2µFRUNSSSYNCVREFCTL_ICTL_TCOMPCURRENTMODECONTROLLERINTERNALREGULATORVINGNDRTADJ8026 BD8026fbFor more information www.linear.com/LTM802611LTM8026operaTion

The LTM8026 is a standalone nonisolated step-down switching DC/DC power supply that can deliver up to 5A of output current. This µModule regulator provides a precisely regulated output voltage programmable via one external resistor from 1.2V to 24V. The input voltage range is 6V to 36V. Given that the LTM8026 is a step-down converter, make sure that the input voltage is high enough to support the desired output voltage and load current. As shown in the Block Diagram, the LTM8026 contains a current mode controller, power switches, power inductor, and a modest amount of input and output capacitance. The LTM8026 utilizes fixed frequency, average current mode control to accurately regulate the inductor current, independently from the output voltage. This is an ideal solution for applications requiring a regulated current source. The control loop will regulate the current in the internal inductor. Once the output has reached the regula-tion voltage determined by the resistor from the ADJ pin to ground, the inductor current will be reduced by the voltage regulation loop. The current control loop has two reference inputs, determined by the voltage at the analog control pins, CTL_I and CTL_T .CTL_I is typically used to set the maximum allowable current output of the LTM8026, while CTL_T is typically used with a NTC thermistor to reduce the output current in response to temperature. The lower of the two analog voltages on CTL_I and CTL_T determines the regulated output current. The analog control range of both the CTL_I and CTL_T pin is from 0V to 1.5V. The RUN pin functions as a precision shutdown pin. When the voltage at the RUN pin is lower than 1.55V, switch-ing is terminated. Below the turn-on threshold, the RUN pin sinks 5.5µA. This current can be used with a resistor between RUN and VIN to the set a hysteresis. During start-up, the SS pin is held low until the part is enabled, after which the capacitor at the soft-start pin is charged with an 11µA current source. The LTM8026 is equipped with a thermal shutdown to protect the device during momentary overload conditions. It is set above the 125°C absolute maximum internal tem-perature rating to avoid interfering with normal specified operation, so internal device temperatures will exceed the absolute maximum rating when the overtemperature protection is active. So, continuous or repeated activation of the thermal shutdown may impair device reliability. During thermal shutdown, all switching is terminated and the SS pin is driven low. The switching frequency is determined by a resistor at the RT pin. The LTM8026 may also be synchronized to an external clock through the use of the SYNC pin.8026fb12For more information www.linear.com/LTM8026LTM8026applicaTions inForMaTion

For most applications, the design process is straight forward, summarized as follows: 1. Look at Table 1 and find the row that has the desired input range and output voltage.2. Apply the recommended CIN, COUT, RADJ and RT values.While these component combinations have been tested for proper operation, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions. Bear in mind that the maximum output current is limited by junction temperature, the relationship between the input and output voltage mag-nitude and polarity and other factors. Please refer to the Table 1. Recommended Component Values and Configuration. (TA = 25°C. See Typical Performance Characteristics for Load Conditions)VIN6V to 36V6V to 36V6V to 36V6V to 36V6V to 36V7V to 36V10V to 36V15V to 36V22V to 36V28V to 36V9V to 15V9V to 15V9V to 15V9V to 15V9V to 15V9V to 15V10V to 15V18V to 36V18V to 36V18V to 36VVOUT1.21.51.82.53.3581218241.21.51.82.53.3581.21.51.8CINCOUT CERAMICCOUT ELECTROLYTIC10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9m_, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9m_, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9m_, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210330µF, 4V, 27mΩ, OS-CON, 4SVPC330M10µF, 50V, 1210100µF, 6.3V, 1210330µF, 4V, 27mΩ, OS-CON, 4SVPC330M10µF, 50V, 1210100µF, 6.3V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M10µF, 50V, 1210100µF, 10V, 1210120µF, 16V, 27m_, OS-CON, 16SVPC120M10µF, 50V, 121047µF, 16V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M10µF, 50V, 121022µF, 25V, 121047µF, 20V, 45mΩ, OS-CON, 20SVPS47M4.7µF, 50V, 121010µF, 50V, 120647µF, 35V, 30mΩ, OS-CON, 35SVPC47M10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9mΩ, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9mΩ, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9mΩ, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210330µF, 4V, 27mΩ, OS-CON, 4SVPC330M10µF, 50V, 1210100µF, 6.3V, 1210330µF, 4V, 27mΩ, OS-CON, 4SVPC330M10µF, 50V, 1210100µF, 6.3V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M10µF, 50V, 1210100µF, 10V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9mΩ, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9mΩ, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210470µF, 6.3V, 9mΩ, Chemi-Con, APXF6R3ARA471MH80G10µF, 50V, 1210100µF, 6.3V, 1210330µF, 4V, 27mΩ, OS-CON, 4SVPC330M10µF, 50V, 1210100µF, 6.3V, 1210330µF, 4V, 27mΩ, OS-CON, 4SVPC330M10µF, 50V, 1210100µF, 6.3V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M10µF, 50V, 1210100µF, 10V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M10µF, 50V, 121047µF, 16V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M10µF, 50V, 1210100µF, 6.3V, 1210330µF, 4V, 27mΩ, OS-CON, 4SVPC330MRADJfOPTIMALRT(OPTIMAL)fMAXRT(MIN)Open200kHz210k250kHz169k38.3k19.6k9.09k5.62k3.09k1.74k1.10k604523Open38.3k19.6k9.09k5.62k3.09k1.74kOpen38.3k19.6k9.09k5.62k3.09k1.74k1.10k5.62k3.09k1.74k1.10k300kHz350kHz450kHz550kHz600kHz625kHz650kHz675kHz700kHz200kHz300kHz350kHz450kHz550kHz600kHz625kHz200kHz300kHz350kHz450kHz550kHz600kHz625kHz650kHz550kHz600kHz625kHz650kHz140k118k90.9k75.0k68.1k64.9k61.9k59.0k57.6k210k140k118k90.9k75.0k68.1k64.9k210k140k118k90.9k75.0k68.1k64.9k61.9k75.0k68.1k64.9k61.9k350kHz400kHz525kHz625kHz700kHz750kHz800kHz900kHz1MHz525kHz650kHz800kHz1MHz1MHz1MHz1MHz250kHz350kHz400kHz525kHz625kHz700kHz750kHz800kHz625kHz700kHz750kHz800kHz118k102k78.7k64.9k57.6k53.6k49.9k44.2k39.2k78.7k61.9k49.9k39.2k39.2k39.2k39.2k169k118k102k78.7k64.9k57.6k53.6k49.9k64.9k57.6k53.6k49.9k8026fb18V to 36V2.518V to 36V3.318V to 36V518V to 36V818V to 36V122.7V to –3.332.5V*2V to 31V*–510µF, 50V, 1210100µF, 6.3V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M10µF, 50V, 1210100µF, 10V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M2V to 28V*–83V to 24V*–1210µF, 50V, 121047µF, 16V, 1210120µF, 16V, 27mΩ, OS-CON, 16SVPC120M*Running voltage. Requires at least 6VIN to start. Note: An input bulk capacitor is required.For more information www.linear.com/LTM802613LTM8026applicaTions inForMaTion

graphs in the Typical Performance Characteristics section for guidance. The maximum frequency (and attendant RT value) at which the LTM8026 should be allowed to switch is given in Table 1 in the fMAX column, while the recommended frequency (and RT value) for optimal efficiency over the given input condition is given in the fOPTIMAL column. There are additional conditions that must be satisfied if the synchronization function is used. Please refer to the Switching Frequency Synchronization section for details.Capacitor Selection ConsiderationsThe CIN and COUT capacitor values in Table 1 are the minimum recommended values for the associated oper-ating conditions. Applying capacitor values below those indicated in Table 1 is not recommended, and may result in undesirable operation. Using larger values is generally acceptable, and can yield improved dynamic response, if necessary. Again, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions.Ceramic capacitors are small, robust and have very low ESR. However, not all ceramic capacitors are suitable. X5R and X7R types are stable over temperature, applied voltage and give dependable service. Other types, including Y5V and Z5U have very large temperature and voltage coefficients of capacitance. In an application circuit they may have only a small fraction of their nominal capacitance resulting in much higher output voltage ripple than expected.Many of the output capacitances given in Table 1 specify an electrolytic capacitor. Ceramic capacitors may also be used in the application, but it may be necessary to use more of them. Many high value ceramic capacitors have a large voltage coefficient, so the actual capacitance of the component at the desired operating voltage may be only a fraction of the specified value. Also, the very low ESR of ceramic capacitors may necessitate additional capacitors for acceptable stability margin.A final precaution regarding ceramic capacitors concerns the maximum input voltage rating of the LTM8026. A ceramic input capacitor combined with trace or cable inductance forms a high Q (under damped) tank circuit. If the LTM8026 circuit is plugged into a live supply, the input voltage can ring to twice its nominal value, possi-bly exceeding the device’s rating. This situation is easily avoided; see the Hot Plugging Safely section.Programming Switching FrequencyThe LTM8026 has an operational switching frequency range between 100kHz and 1MHz. This frequency is programmed with an external resistor from the RT pin to ground. Do not leave this pin open under any circumstance. See Table 2 for resistor values and the corresponding switching frequencies.Table 2. RT Resistor Values and Their Resultant Switching FrequenciesSWITCHING FREQUENCY (MHz)10.7500.50.30.20.1RT (kΩ)39.253.682.5140210453In addition, the Typical Performance Characteristics sec-tion contains a graph that shows the switching frequency versus RT value.To improve efficiency at light load, the part will enter discontinuous mode.Switching Frequency Trade-OffsIt is recommended that the user apply the optimal RT value given in Table 1 for the input and output operating condition. System level or other considerations, however, may necessitate another operating frequency. While the LTM8026 is flexible enough to accommodate a wide range of operating frequencies, a haphazardly chosen one may result in undesirable operation under certain operating or fault conditions. A frequency that is too high can reduce efficiency, generate excessive heat or even damage the LTM8026 in some fault conditions. A frequency that is too low can result in a final design that has too much output ripple or too large of an output capacitor.Switching Frequency SynchronizationThe nominal switching frequency of the LTM8026 is determined by the resistor from the RT pin to GND and 8026fb14For more information www.linear.com/LTM8026LTM8026applicaTions inForMaTion

may be set from 100kHz to 1MHz. The internal oscillator may also be synchronized to an external clock through the SYNC pin. The external clock applied to the SYNC pin must have a logic low below 0.6V and a logic high greater than 1.2V. The input frequency must be 20% higher than the frequency determined by the resistor at the RT pin. In general, the duty cycle of the input signal should be greater than 10% and less than 90%. Input signals outside of these specified parameters may cause erratic switching behavior and subharmonic oscillations. The SYNC pin must be tied to GND if the synchronization to an external clock is not required. When SYNC is grounded, the switching frequency is determined by the resistor at the RT pin. At light loads, the LTM8026 will enter discontinuous opera-tion to improve efficiency even while a valid clock signal is applied to the SYNC pin.Soft-StartThe soft-start function controls the slew rate of the power supply output voltage during start-up. A controlled output voltage ramp minimizes output voltage overshoot, reduces inrush current from the VIN supply, and facilitates supply sequencing. A capacitor connected from the SS pin to GND programs the slew rate. The capacitor is charged from an internal 11µA current source to produce a ramped output voltage. Maximum Output Current AdjustTo adjust the regulated load current, an analog voltage is applied to the CTL_I pin or CTL_T pins. Varying the voltage between 0V and 1.5V adjusts the maximum current between the minimum and the maximum current, 5.6A typical. Graphs of the output current vs CTL_I and CTL_T volt-ages are given in the Typical Performance Characteristics section. The LTM8026 provides a 2V reference voltage for conveniently applying resistive dividers to set the current limit. The current limit can be set as shown in Figure 1 with the following equation:7.467•R2IMAX= Amps

R1+R2

Load Current Derating Using the CTL_T PinIn high current applications, derating the maximum current based on operating temperature may prevent damage to the load. In addition, many applications have thermal limitations that will require the regulated current to be reduced based on the load and/or board temperature. To achieve this, the LTM8026 uses the CTL_T pin to reduce the effective regulated current in the load. While CTL_I programs the regulated current in the load, CTL_T can be configured to reduce this regulated current based on the analog voltage at the CTL_T pin. The load/board temperature derating is programmed using a resistor divider with a temperature dependant resistance (Figure 2). When the board/load temperature rises, the CTL_T voltage will decrease. To reduce the regulated current, the CTL_T voltage must be lower than the voltage at the CTL_I pin. CTL_T may be higher than CTL_I, but then it will have no effect.Voltage Regulation and Output Overvoltage ProtectionThe LTM8026 uses the ADJ pin to regulate the output voltage and to provide a high speed overvoltage lockout to avoid high voltage conditions. If the output voltage exceeds 125% of the regulated voltage level (1.5V at the ADJ pin), the LTM8026 terminates switching and shuts VREFLTM8026CTL_I OR CTL_TR28026 F012VR1Figure 1. Setting the Output Current Limit, IMAXRVVREFR2LTM8026CTL_TR1(OPTION A TO D)A

RNTCRNTCRX

RNTCRNTCRVRX

8026 F02Figure 2. Load Current Derating vs Temperature Using NTC Resistor8026fbFor more information www.linear.com/LTM802615LTM8026applicaTions inForMaTion

down switching for 13µs. The regulated output voltage must be greater than 1.21V and is set by the equation:11.9

RADJ=kΩ

VOUT–1.19

divider resistors for programming the falling UVLO voltage and rising enable voltage (VENA) as configured in Figure 4.1.55•R2UVLO–1.55

V–1.084•UVLOR2=ENA5.5µA R1=

where RADJ is shown in Figure 3.VOUTLTM8026ADJRADJ

8026 F03VOUTThe RUN pin has an absolute maximum voltage of 6V. To accommodate the largest range of applications, there is an internal Zener diode that clamps this pin, so that it can be pulled up to a voltage higher than 6V through a resistor that limits the current to less than 100µA. For applications where the supply range is greater than 4:1, size R2 greater than 375k.VINLTM8026RUNR18026 F04Figure 3. Voltage Regulation and Overvoltage Protection Feedback ConnectionsVINR2Thermal ShutdownIf the part is too hot, the LTM8026 engages its thermal shutdown, terminates switching and discharges the soft-start capacitor. When the part has cooled, the part automati-cally restarts. This thermal shutdown is set to engage at temperatures above the 125°C absolute maximum internal operating rating to ensure that it does not interfere with functionality in the specified operating range. This means that internal temperatures will exceed the 125°C absolute maximum rating when the overtemperature protection is active, possibly impairing the device’s reliability.Shutdown and UVLOThe LTM8026 has an internal UVLO that terminates switch-ing, resets all logic, and discharges the soft-start capacitor when the input voltage is below 6V. The LTM8026 also has a precision RUN function that enables switching when the voltage at the RUN pin rises to 1.68V and shuts down the LTM8026 when the RUN pin voltage falls to 1.55V. There is also an internal current source that provides 5.5μA of pull-down current to program additional UVLO hysteresis. For RUN rising, the current source is sinking 5.5µA until RUN = 1.68V, after which it turns off. For RUN falling, the current source is off until the RUN = 1.55V, after which it sinks 5.5µA. The following equations determine the voltage Figure 4. UVLO ConfigurationLoad SharingTwo or more LTM8026s may be paralleled to produce higher currents. To do this, simply tie VOUT, SS, RUN and ADJ together. The value of the ADJ resistor is given by the equation:11.9

RADJ= kΩ

n(VOUT–1.19)

where n is the number of LTM8026s in parallel. Given the LTM8026’s accurate current limit and CVCC operation, each paralleled unit will contribute a portion of the output current, up to the amount determined by the CTL_I and CTL_T pins. An example of this is given in the Typical Applications section.Two or more LTM8026s can share load current equally by using a simple op amp circuit to simultaneously modulate the CTL_I pins. Tie SS, RUN, and VOUT and CTL_I of all of the paralleled LTM8026s together. An example of two 8026fb16For more information www.linear.com/LTM8026LTM8026applicaTions inForMaTion

LTM8026s equally sharing output current is shown in the Typical Applications section. The modulation of the CTL_I inputs is performed at a high bandwidth, so use an op amp with a gain bandwidth product greater than 1MHz. The example circuit in the Typical Applications section uses the LTC6255, which has a minimum gain bandwidth product of 2MHz. The LTM8026’s CVCC operation provides the ability to power share the load among several input voltage sources. An example of this is shown in the Typical Applications section; please refer to the schematic while reading this discussion. Suppose the application powers 2.5V at 8A and the system under consideration has regulated 24V and 12V input rails available. The power budget for the power rails says that each can allocate only 750mA to produce 2.5V. From the Input Current vs Output Current graph in the Typical Performance Characteristics section for 2.5VOUT, 750mA from the 24V rail can support more than 5A output current, so apply a 66.5k/140k from VREF to the CTL_I pin of the LTM8026 powered from 24VIN to set the output current to 5A. These resistor values were derived as follows: 1. The typical output current limit is 5.6A for CTL_I = 1.5V and above. 2. To get 5A, make the voltage on CTL_I = 1.5V • 5A/5.6A = 1.34V. 3. The VREF node is a regulated 2V, so applying the 66.5k/140k network yields 2V • 140k/(66.5k + 140k) = 1.35VThe LTM8026 powered from 12VIN needs to supply the rest of the load current, or 3A. Again referring to the Input Current vs Output Current graph in the Typical Performance Characteristics section for 2.5VOUT, 750mA will support more than 3A when operated from 12VIN. Using a method similar to the above, apply a resistor network of 132k/78.7k to the CTL_I pin:1. To get 2.5A, make the voltage on CTL_I = 1.5V • 3A/5.6A = 0.8V2. Applying a 132k/88.7k network to VREF and CTL_I yields 2V • 88.7k/(88.7k + 132k) = 0.8V8026fbCTL_TCOMPCTL_IVREFRT•••COUT••••••VOUT•GND•••••••••SSADJ•••••VINSYNCRUN••••••••••••••GNDVOUTGNDCINVIN8026 F05•THERMAL AND INTERCONNECT VIASFigure 5. Layout Showing Suggested External Components, GND Plane and Thermal Vias. As seen in the graph accompanying the schematic in the Typical Applications section, the input currents to each LTM8026 stays below 750mA for all loads below 8A. PCB LayoutMost of the headaches associated with PCB layout have been alleviated or even eliminated by the high level of integration of the LTM8026. The LTM8026 is neverthe-less a switching power supply, and care must be taken to minimize EMI and ensure proper operation. Even with the high level of integration, you may fail to achieve specified operation with a haphazard or poor layout. See Figure 5 for a suggested layout. Ensure that the grounding and heat sinking are acceptable.A few rules to keep in mind are:1. Place the RADJ and RT resistors as close as possible to their respective pins.2. Place the CIN capacitor as close as possible to the VIN and GND connection of the LTM8026.For more information www.linear.com/LTM802617LTM8026applicaTions inForMaTion

3. Place the COUT capacitor as close as possible to the VOUT and GND connection of the LTM8026.4. Place the CIN and COUT capacitors such that their ground current flow directly adjacent or underneath the LTM8026.5. Connect all of the GND connections to as large a copper pour or plane area as possible on the top layer. Avoid breaking the ground connection between the external components and the LTM8026.6. Use vias to connect the GND copper area to the board’s internal ground planes. Liberally distribute these GND vias to provide both a good ground connection and thermal path to the internal planes of the printed circuit board. Pay attention to the location and density of the thermal vias in Figure 5. The LTM8026 can benefit from the heat sinking afforded by vias that connect to internal GND planes at these locations, due to their proximity to internal power handling components. The optimum number of thermal vias depends upon the printed circuit board design. For example, a board might use very small via holes. It should employ more thermal vias than a board that uses larger holes.Hot Plugging SafelyThe small size, robustness and low impedance of ceramic capacitors make them an attractive option for the input bypass capacitor of LTM8026. However, these capacitors can cause problems if the LTM8026 is plugged into a live input supply (see Application Note 88 for a complete dis-cussion). The low loss ceramic capacitor combined with stray inductance in series with the power source forms an underdamped tank circuit, and the voltage at the VIN pin of the LTM8026 can ring to more than twice the nominal input voltage, possibly exceeding the LTM8026’s rating and damaging the part. If the input supply is poorly con-trolled or the user will be plugging the LTM8026 into an energized supply, the input network should be designed to prevent this overshoot. This can be accomplished by installing a small resistor in series to VIN, but the most popular method of controlling input voltage overshoot is to add an electrolytic bulk capacitor to the VIN net. This capacitor’s relatively high equivalent series resistance damps the circuit and eliminates the voltage overshoot. The extra capacitor improves low frequency ripple filter-ing and can slightly improve the efficiency of the circuit, though it is physically large.Thermal ConsiderationsThe LTM8026 output current may need to be derated if it is required to operate in a high ambient temperature. The amount of current derating is dependent upon the input voltage, output power and ambient temperature. The temperature rise curves given in the Typical Performance Characteristics section can be used as a guide. These curves were generated by the LTM8026 mounted to a 58cm2 4-layer FR4 printed circuit board. Boards of other sizes and layer count can exhibit different thermal behavior, so it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental operating conditions.For increased accuracy and fidelity to the actual applica-tion, many designers use finite element analysis (FEA) to predict thermal performance. To that end, Page 2 of the data sheet typically gives four thermal coefficients: θJA – Thermal resistance from junction to ambient θJCbottom – Thermal resistance from junction to the bottom of the product caseθJCtop – Thermal resistance from junction to top of the product caseθJB – Thermal resistance from junction to the printed circuit board. While the meaning of each of these coefficients may seem to be intuitive, JEDEC has defined each to avoid confusion and inconsistency. These definitions are given in JESD 51-12, and are quoted or paraphrased below:θJA is the natural convection junction-to-ambient air thermal resistance measured in a one cubic foot sealed enclosure. This environment is sometimes referred to as “still air” although natural convection causes the air to move. This value is determined with the part mounted to a JESD 51-9 defined test board, which does not reflect an actual application or viable operating condition.8026fb18For more information www.linear.com/LTM8026LTM8026applicaTions inForMaTion

θJCbottom is the junction-to-board thermal resistance with all of the component power dissipation flowing through the bottom of the package. In the typical µModule regulator, the bulk of the heat flows out the bottom of the package, but there is always heat flow out into the ambient envi-ronment. As a result, this thermal resistance value may be useful for comparing packages but the test conditions don’t generally match the user’s application.θJCtop is determined with nearly all of the component power dissipation flowing through the top of the package. As the electrical connections of the typical µModule regulator are on the bottom of the package, it is rare for an application to operate such that most of the heat flows from the junc-tion to the top of the part. As in the case of θJCbottom, this value may be useful for comparing packages but the test conditions don’t generally match the user’s application.θJB is the junction-to-board thermal resistance where almost all of the heat flows through the bottom of the µModule regulator and into the board, and is really the sum of the θJCbottom and the thermal resistance of the bottom of the part through the solder joints and through a portion of the board. The board temperature is measured a specified distance from the package, using a 2-sided, 2-layer board. This board is described in JESD 51-9.Given these definitions, it should now be apparent that none of these thermal coefficients reflects an actual physical operating condition of a µModule regulator. Thus, none of them can be individually used to accurately predict the thermal performance of the product. Likewise, it would be inappropriate to attempt to use any one coefficient to correlate to the junction temperature vs load graphs given in the product’s data sheet. The only appropriate way to use the coefficients is when running a detailed thermal analysis, such as FEA, which considers all of the thermal resistances simultaneously.A graphical representation of these thermal resistances is given in Figure 6.The blue resistances are contained within the µModule device, and the green are outside.The die temperature of the LTM8026 must be lower than the maximum rating of 125°C, so care should be taken in the layout of the circuit to ensure good heat sinking of the LTM8026. The bulk of the heat flow out of the LTM8026 is through the bottom of the module and the LGA pads into the printed circuit board. Consequently a poor printed circuit board design can cause excessive heating, result-ing in impaired performance or reliability. Please refer to the PCB Layout section for printed circuit board design suggestions.JUNCTION-TO-AMBIENT RESISTANCE (JESD 51-9 DEFINED BOARD)JUNCTION-TO-CASE (TOP)RESISTANCECASE (TOP)-TO-AMBIENTRESISTANCEJUNCTIONJUNCTION-TO-BOARD RESISTANCEJUNCTION-TO-CASECASE (BOTTOM)-TO-BOARD(BOTTOM) RESISTANCERESISTANCEBOARD-TO-AMBIENTRESISTANCEAMBIENT

8026 F06µMODULE DEVICEFigure 68026fbFor more information www.linear.com/LTM802619LTM8026Typical applicaTions

36VIN, 3.3VOUT Step-Down CVCC ConverterVIN

6V TO 36V

VINSSSYNCCOMPRT75.0kLTM8026VOUTVREFCTL_ICTL_TGNDADJ5.62k8026 TA0210µF510kRUNVOUT3.3V5A

+100µF330µF36VIN, 5.6A Two 2.5V Series Supercapacitor ChargerVIN

7V TO 36V

VINSSSYNCCOMPRT68.1kLTM8026VOUTVREFCTL_ICTL_TGNDADJ3.09k47µF2.5V 2.2FVOUT5V2.5V 2.2F10µF510kRUN8026 TA0336VIN, 12VOUT Step-Down CVCC ConverterVIN

15V TO 36V

VINSSSYNCCOMPRT61.9kLTM8026VOUTVREFCTL_ICTL_TGNDADJ1.1k8026 TA0410µF510kRUNVOUT12V3.5A+47µF120µF8026fb20For more information www.linear.com/LTM8026LTM8026Typical applicaTions

31VIN, –5VOUT Negative CVCC ConverterVIN7V TO 31VVINSS5V02N390620k20k20kSYNCLTM8026VOUTVREFCTL_I120µF10µFRUN+OPTIONAL100µFCTL_TCOMPRTGNDADJ68.1k3.09k8026 TA05OPTIONAL: SEE DESIGN NOTE 1021VOUT–5V5ATwo LTM8026s Operating in Parallel to Produce 2.5VOUT at 10AVIN

6V TO 36V

LTM8026VOUTVREFCTL_ICTL_TGNDADJ100µFVOUT2.5V10A

10µF324kVINSSRUNSYNCCOMPRT75k4.53kVINSSLTM8026VOUTVREFCTL_ICTL_TGNDADJ100µFRUNSYNCCOMPRT75k8026 TA06+330µF8026fbFor more information www.linear.com/LTM802621LTM8026Typical applicaTions

Two LTM8026s Operating in Parallel to Produce 2.5VOUT at 10A, Equally Sharing CurrentVIN

6V TO 36V

LTM8026VOUTVREFCTL_TCTL_IGNDADJ100µFVOUT2.5V10A10µF324kVINSSRUNSYNCCOMPRT75k4.02k680k470pFVOUTVREFVINSSLTM8026VOUTVREFCTL_TCTL_IGNDADJ100µF330µFRUNSYNC0.1µFCOMPRT75k0.47µF+LTC6255Two LTM8026s Running from 12V and 24V. At Max Load, Each LTM8026 Draws Less Than 750mA from Their Respective Input Sources VIN1

REGULATED

24V

<750mA10µF324kVINSSSYNCCOMPRTLTM8026VOUTVREFCTL_ICTL_TGNDADJ66.5kINPUT CURRENT (mA)140k100µF700600500400300200100

330µF0

515

VOUT2.5V8A

RUNInput Current vs Output Current24V INPUT CURRENT12V INPUT CURRENTTOTAL INPUT POWER25

90.9k4.53kVIN1

REGULATED

12V

<750mA10µFVINSSLTM8026VOUTVREFCTL_ICTL_TGNDADJ132k88.7k8026 TA07RUNSYNCCOMPRT100µF+0

90.9k22For more information www.linear.com/LTM8026–+100k100k8026 TA09VOUT150k100k20

TOTAL INPUT POWER (W)10

462

OUTPUT CURRENT (A)

8026 TA07b

8026fbLTM8026package DescripTion

Table 3. Pin Assignment Table (Arranged by Pin Number)PINA1A2A3A4A5A6A7A8PING1G2G3G4G5G6G7G8NAMEVOUTVOUTVOUTVOUTGNDGNDGNDGNDNAMEGNDGNDGNDGNDGNDGNDGNDRTH5H6H7H8GNDGNDGNDCOMPJ5J6J7J8GNDGNDGNDSSK5K6K7K8GNDGNDGNDADJL5L6L7L8GNDRUNSYNCGNDPINB1B2B3B4B5B6B7B8PINNAMEVOUTVOUTVOUTVOUTGNDGNDGNDGNDNAMEPINC1C2C3C4C5C6C7C8PINJ1J2J3NAMEVOUTVOUTVOUTVOUTGNDGNDGNDGNDNAMEVINVINVINPIND1D2D3D4D5D6D7D8PINK1K2K3NAMEVOUTVOUTVOUTVOUTGNDGNDGNDCTL_TNAMEVINVINVINPINE1E2E3E4E5E6E7E8PINL1L2L3NAMEGNDGNDGNDGNDGNDGNDGNDCTL_INAMEVINVINVINPINF1F2F3F4F5F6F7F8NAMEGNDGNDGNDGNDGNDGNDGNDVREFpackage phoTo

8026fbFor more information www.linear.com/LTM802623LGA Package81-Lead (15mm × 11.25mm × 2.82mm)(Reference LTC DWG # 05-08-1868 Rev A)DETAIL ASEE NOTESaaa ZPAD 1ALTM8026package DescripTion

Z// bbb Zaaa Z0.0004.4453.1751.9050.6350.6351.9053.1754.445248Ab76543217PAD “A1”CORNERBCDE4DSUBSTRATEMOLDCAPFFG0.27 – 0.372.45 – 2.55HJKDETAIL BeLbGDETAIL BeSEE NOTES3XYEPACKAGE TOP VIEWDIA (0.630) 81xeeeSXYPACKAGE BOTTOM VIEWNOTES:1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-19942. ALL DIMENSIONS ARE IN MILLIMETERS3 LAND DESIGNATION PER JESD MO-222, SPP-010Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.For more information www.linear.com/LTM80266.3505.080DETAIL A0.630 ±0.025 Ø 81x4DETAILS OF PAD #1 IDENTIFIER ARE OPTIONAL,BUT MUST BE LOCATED WITHIN THE ZONE INDICATED.THE PAD #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE5. PRIMARY DATUM -Z- IS SEATING PLANEDIMENSIONSNOTES6. THE TOTAL NUMBER OF PADS: 817MAX2.920.66!0.000MIN2.720.605.0806.350NOM2.820.6315.011.251.2712.708.89PACKAGE ROW AND COLUMN LABELING MAY VARY AMONG µModule PRODUCTS. REVIEW EACH PACKAGE LAYOUT CAREFULLYSYMBOLAbDEeFGaaabbbeee0.150.100.05TOTAL NUMBER OF LGA PADS: 81COMPONENTPIN “A1”LTMXXXXXXµModuleSUGGESTED PCB LAYOUTTOP VIEWTRAY PIN 1BEVELPACKAGE IN TRAY LOADING ORIENTATIONLGA 81 1212 REV A8026fbLTM8026revision hisTory

REVABDATE8/125/13DESCRIPTIONAdded MP-Grade.Update maximum solder temperature.Update Package Description drawing.PAGE NUMBER2-32248026fbInformation furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.For more information www.linear.com/LTM802625LTM8026Typical applicaTion

36VIN, 3.3VOUT Step-Down Converter with 4.75A Accurate Current LimitVIN6V TO 36V510kVINSSSYNCCOMPRT75kLTM8026VOUTVREFCTL_ICTL_TGNDADJ5.62k71.5k127k8026 TA0810µFRUN100µFVOUT3.3V4.75A+330µFDesign resources

SUBJECTµModule Design and Manufacturing ResourcesDESCRIPTIONDesign: • Selector Guides • Demo Boards and Gerber Files • Free Simulation ToolsManufacturing: • Quick Start Guide • PCB Design, Assembly and Manufacturing Guidelines • Package and Board Level ReliabilityµModule Regulator Products Search1. Sort table of products by parameters and download the result as a spread sheet.2. Search using the Quick Power Search parametric table. TechClip VideosDigital Power System ManagementQuick videos detailing how to bench test electrical and thermal performance of µModule products.Linear Technology’s family of digital power supply management ICs are highly integrated solutions that offer essential functions, including power supply monitoring, supervision, margining and sequencing, and feature EEPROM for storing user configurations and fault logging.relaTeD parTs

PART NUMBERDESCRIPTIONLTM8062LTM8027LTM8052LTM4618LTM4612LTC2978LTC2974COMMENTS32VIN, 2A µModule Battery Charger with Maximum Peak Adjustable VBATT up to 14.4V, C/10 or Timer Termination, Power Tracking (MPPT)9mm × 15mm × 4.32mm LGA Package60VIN, 4A DC/DC Step-Down µModule Regulator4.5V ≤ VIN ≤ 60V, 2.5V ≤ VOUT ≤ 24V, 15mm × 15mm × 4.32mm LGA Package36VIN, ±5A µModule Regulator with Adjustable Accurate 6V ≤ VIN ≤ 36V, 1.2V ≤ VOUT ≤ 24V, –5V ≤ IOUT ≤ 5A, Synchronizable, Pin Current LimitCompatible with LTM8026, 11.25mm × 15mm × 2.82mm LGA Package26VIN, 6A Step-Down µModule Regulator5A EN55022 Class B DC/DC Step-Down µModule RegulatorOctal Digital Power Supply Manager with EEPROMQuad Digital Power Supply Manager witih EEPROM4.5V ≤ VIN ≤ 26.5V, 0.8V ≤ VOUT ≤ 5V, Synchronizable, VOUT Tracking, 9mm × 15mm × 4.3mm LGA Package5V ≤ VIN ≤ 36V, 3.3V ≤ VOUT ≤ 15V, PLL Input, VOUT Tracking and Margining, 15mm × 15mm × 2.8mm LGA Package I2C/PMBus Interface, Configuration EEPROM, Fault Logging, 16-Bit ADC with ±0.25% TUE, 3.3V to 15V OperationI2C/PMBus Interface, Configuration EEPROM, Fault Logging, Per Channel Voltage, Current and Temperature Measurements8026fbLT 0513 REV B • PRINTED IN USA26Linear Technology Corporation(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LTM8026 LINEAR TECHNOLOGY CORPORATION 2012

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