LTM4636 40A DC/DC µModule Regulator FeaTuresDescripTion n Stacked Inductor Acts as Heat Sink The LTM®4636 is a 40A step-down µModule (power n Wide Input Voltage Range: 4.7V to 15V module) switching regulator with a stacked inductor as a n 0.6V to 3.3V Output Voltage Range heat sink for quicker heat dissipation and cooler operation n ±1.3% Total DC Output Voltage Error Over Line, in a small package. The exposed inductor permits direct Load and Temperature (–40°C to 125°C) contact with airflow from any direction. The LTM4636 n Differential Remote Sense Amplifier for Precision can deliver 40W (12VIN, 1VOUT, 40A, 200LFM) with only Regulation 40°C rise over the ambient temperature. Full-power 40W n Current Mode Control/Fast Transient Response is delivered, up to 83°C ambient and half-power 20W is n Frequency Synchronization supported at 110°C ambient. n Parallel Current Sharing (Up to 240A) The LTM4636 operates at 92%, 90% and 88% efficiency, n Internal or External Compensation delivering 15A, 30A and 40A, respectively, to a 1V load n 88% Efficiency (12VIN, 1VOUT) at 40A (12VIN). The µModule regulator is scalable such that four n Overcurrent Foldback Protection µModules in current sharing mode deliver 160W with only n 16mm × 16mm × 7.07mm BGA Package 40°C rise and 88% efficiency (12VIN, 1VOUT, 400LFM). The LTM4636 is offered in a 16mm × 16mm × 7.07mm applicaTions BGA package. L n , LT, LTC, LTM, PolyPhase, Burst Mode, µModule, Linear Technology, LTpowerCAD and the Telecom Servers and Networking Equipment Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks n are the property of their respective owners. Protected by U.S. Patents, including 5481178, Industrial Equipment and Medical Systems 5847554, 6580258, 6304066, 6476589, 6774611, 6677210, 8163643. Typical applicaTion1V, 40A DC/DC µModule Regulator12VIN , 1VOUT Efficiencyvs Output Current VIN ≤ 5.5V, TIE VIN, INTVCC AND PVCC 100 TOGETHER, TIE RUNP TO GND. VIN > 5.5V, THEN OPERATE AS SHOWN 4.70V TO PVCC 95 15V PVCC INTVCC + 22µF 22µF 100µF 90 16V 15k V 25V IN INTV PV ×5 CC CC RUNC 85 0.1µF LTM4636 1V EFFICIENCY (%) 80 RUNP V V OUT OUT INTV 1V, 40A CC HIZREG V + 75 FREQ OUTS1 + 470µF 100µF 34.8k TRACK/SS 6.3V 6.3V MODE/PLLIN ×3 ×4 70 0 5 10 15 20 25 30 35 40 V – OUTS1 OUTPUT CURRENT (A) 4636 TA01b SNSP1 SNSP2 PINS NOT USED IN THIS CIRCUIT: COMPA CLKOUT, GMON, PGOOD, PHMODE, PWM, COMPB VFB SW, TEST1, TEST2, TEST3, TEST4, TMON TEMP+ TEMP– SGND PGND 7.5k 4636 TA01a OPTIONAL TEMP MONITOR 4636f For more information www.linear.com/LTM4636 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Decoupling Requirements Operation Applications Information Typical Applications Package Description Package Photo Typical Application Design Resources Related Parts
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