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LTM4612

27

4612fc

For more information 

www.linear.com/LTM4612

REVISION HISTORY

REV

DATE

DESCRIPTION

PAGE NUMBER

A

03/10

Changes to Title and Description
Changes to Absolute Maximum Ratings
Changes to Electrical Characteristics 
Text Changes to Operation Section
Text Changes to Applications Information Section
Changes to Figures 18, 19, 20, 21, 22
Changes to Related Parts

1
1

2, 3

10

12, 14

19, 20, 21, 22

26

B

05/11

Changes to the Title, Description, Features and Typical Application sections.
Changes to “The 

l

 denotes...” statement and Note 2.

Changes to the Pin Functions.
Changes to the Block Diagram.
Text changes to the Operation section.
Text changes to the Applications Information section.
Changes to Figures 17, 19, 21, 22.
Changes to the Related Parts.

1

2, 3, 4

7, 8

9

10

10–20

20, 21, 22, 23

28

C

09/16

Changed Max value of V

INTVCC

 from 5.3V to 5.5V

3

Information 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.

Summary of Contents for EN55022B

Page 1: ...d regulation The LTM4612 is Pb free and RoHS compliant L LT LTC LTM Linear Technology the Linear logo PolyPhase and Module are registered trademarks and LTpowerCAD is a trademark of Linear Technology...

Page 2: ...15mm 15mm 2 8mm LGA 40 C to 125 C LTM4612MPV PBF LTM4612MPV PBF LTM4612MPV 133 Lead 15mm 15mm 2 8mm LGA 55 C to 125 C Consult LTC Marketing for parts specified with wider operating temperature ranges...

Page 3: ...X5R Ceramic and 1 100 F Electrolytic 1 10 F X5R Ceramic on VD Pins VIN 24V VOUT 5V VIN 24V VOUT 12V 7 2 3 4 mVP P mVP P VOUT AC Output Ripple Voltage IOUT 0A COUT 2 22 F 2 47 F X5R Ceramic VIN 24V VOU...

Page 4: ...rence Voltage 1 18 V VMARG0 VMARG1 MARG0 MARG1 Voltage Thresholds 1 4 V PGOOD DVFBH PGOOD Upper Threshold VFB Rising 7 10 13 DVFBL PGOOD Lower Threshold VFB Falling 7 10 13 DVFB HYS PGOOD Hysteresis V...

Page 5: ...5 50 80 75 4 5 4612 G02 12VIN 5VOUT 24VIN 5VOUT 36VIN 5VOUT LOAD CURRENT A 0 EFFICIENCY 70 95 100 1 2 3 60 85 65 90 55 50 80 75 4 5 4612 G03 20VIN 12VOUT 24VIN 12VOUT 28VIN 12VOUT 36VIN 12VOUT LOAD CU...

Page 6: ...SCON CAPACITOR 50 s DIV IIN 0 2A DIV VOUT 5V DIV 4612 G11 COUT 2 22 F CERAMIC CAPACITORS AND 2 47 F CERAMIC CAPACITORS 20 s DIV IIN 2A DIV VOUT 5V DIV 4612 G12 COUT 2 22 F CERAMIC CAPACITORS AND 2 47...

Page 7: ...enable discontinuous mode opera tion at low load or to a resistive divider from a secondary output when using a secondary winding TRACK SS PinA9 OutputVoltageTrackingandSoft Start Pin When the module...

Page 8: ...ied Thepinshaveaninternalpull downresistor of 50k See the Applications Information section SGND Pins D9 H12 Signal Ground Pins These pins connect to PGND at output capacitor point COMP Pins A11 D11 Cu...

Page 9: ...or Requirement VIN 20V to 36V VOUT 12V IOUT 4A 100 150 F Specifications are at TA 25 C Use Figure 1 configuration INTERNAL COMP SGND COMP PGOOD RUN 1 9V ON 1V OFF MAX 5V MARG1 MARG0 MPGM FCB PLLIN CSS...

Page 10: ...and ensure the electromagnetic interference EMI meets the limits of EN55022 Class B Pulling the RUN pin below 1V forces the controller into its shutdown state turning off both M1 and M2 At light load...

Page 11: ...7 5 2 10 F 50V 100 F 50V 4 47 F 16V None 12 86 178 14 8 3 13 7 5 2 10 F 50V 100 F 50V 2 22 F 16V 150 F 25V 24 83 166 27 3 13 7 5 2 10 F 50V 100 F 50V 4 47 F 16V None 24 86 169 14 8 3 13 7 5 2 10 F 50...

Page 12: ...equency vs Output Voltage Figure 3 Inductor Current Ripple vs Output Voltage VOUT V 2 600 800 1200 8 12 4612 F02 400 4 6 10 14 16 200 1000 FREQUENCY kHz 2 2 5 3 0 2 0 1 5 6 10 4 8 12 14 16 1 0 0 5 3 5...

Page 13: ...t advisable to properly derate the input capacitor or choose a capacitor rated at a higher temperature than required Always contact the capacitor manufacturer for derating requirements In a typical 5A...

Page 14: ...pple current versus the duty cycle Figure 5 provides a ratio of peak to peak output ripple current to the inductor ripple current as functions of duty cycle and the number of paralleled phases Pick th...

Page 15: ...ce continuous mode are disabled during the soft start process The soft start function can also be used to control the output ramp rising time so that another regulator can be easily tracked Output Vol...

Page 16: ...acks with margining COMP Pin The pin is the external compensation pin The module has alreadybeeninternallycompensatedformostoutputvolt ages LTpowerCAD from Linear Technology is available for more cont...

Page 17: ...al Considerations and Output Current Derating In different applications LTM4612 operates in a variety of thermal environments The maximum output current is limited by the environment thermal condition...

Page 18: ...3 5 4 5 105 4612 F11 0LFM 400LFM 200 LFM AMBIENT TEMPERATURE C 25 0 LOAD CURRENT A 1 0 2 0 3 0 35 45 55 65 85 75 95 4 0 5 0 0 5 1 5 2 5 3 5 4 5 105 4612 F12 0LFM 400LFM 200 LFM AMBIENT TEMPERATURE C...

Page 19: ...ure 9 0 BGA Heat Sink 12 2 Figures 12 14 16 24 36 Figure 9 200 BGA Heat Sink 8 6 Figures 12 14 16 24 36 Figure 9 400 BGA Heat Sink 7 7 Table 4 5V Output DERATING CURVE VIN V POWER LOSS CURVE AIR FLOW...

Page 20: ...Place high frequency ceramic input and output capaci tors next to the VD PGND and VOUT pins to minimize high frequency noise Place a dedicated power ground layer underneath the unit Useroundcornersfo...

Page 21: ...TO 36V CLOCK SYNC REFER TO TABLE 2 EXTERNAL 5V SUPPLY IMPROVES EFFICIENCY ESPECIALLY FOR HIGH INPUT VOLTAGES ON OFF LTM4612 SGND PGND MARGIN CONTROL R4 100k RfSET 191k 1 RFB 22 1k R1 392k 5 MARGIN 461...

Page 22: ...F20 VD VIN PLLIN C1 10 F 50V VOUT 15V 4A APPLICATIONS INFORMATION PGOOD RUN COMP INTVCC DRVCC fSET TRACK SS VOUT VFB FCB MARG0 MARG1 MPGM PULL UP SUPPLY 5V R2 100k C7 0 33 F C6 47pF C3 22 F 16V 4612 F...

Page 23: ...5 100 F 50V C2 10 F 50V C8 10 F 50V VIN 22V TO 36V LTC6908 1 2 PHASE OSCILLATOR CLOCK SYNC 0 PHASE CLOCK SYNC 180 PHASE LTM4612 SGND PGND PGOOD RUN COMP INTVCC DRVCC fSET TRACK SS LTM4612 SGND 12V TRA...

Page 24: ...CLOCK SYNC 0 PHASE CLOCK SYNC 180 PHASE SGND PGND PGOOD RUN COMP INTVCC DRVCC fSET TRACK SS VIN VD PLLIN SGND 5V TRACK PGND MARGIN CONTROL R4 100k RfSET1 150k RFB1 13 7k R1 392k R8 100k R9 22 1k RfSET...

Page 25: ...5 H6 H7 H8 H9 H10 H11 PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PIN NAME J1 J2 J3 J4 J5 J6 J7 J8 J9 J10 J11 VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT K1 K2 K3 K4 K5 K6 K7 K8...

Page 26: ...BSC 4 PAD 1 CORNER X Y aaa Z aaa Z DETAIL A 13 97 BSC 1 27 BSC 13 97 BSC 0 12 0 28 PACKAGE BOTTOM VIEW C 0 30 PAD 1 3 PADS SEE NOTES 1 2 3 4 5 6 7 8 10 9 11 12 DETAIL A 0 630 0 025 SQ 133x S Y X eee...

Page 27: ...ation sections Changes to The l denotes statement and Note 2 Changes to the Pin Functions Changes to the Block Diagram Text changes to the Operation section Text changes to the Applications Informatio...

Page 28: ...ator with PLL Output Tracking 4 5V VIN 26 5V 0 8V VOUT 5V Synchronizable 9mm 15mm 4 3mm LGA Package LTM8033 EN55022B Compliant 36VIN 3A DC DC Step Down Module Regulator 3 6V VIN 36V 0 8V VOUT 24V Sync...

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