Datasheet LTM4636-1 (Analog Devices)

LTM4636-1 40A µModule Regulator with Overvoltage/ Overtemperature Protection FEATURES DESCRIPTION n
Overtemperature, Input/Output Overvoltage
The LTM®4636-1 is a 40A step-down µModule® (power
Protection
module) switching regulator with stacked inductor as a n
Trips Upstream Power Source or Circuit Breaker
heat sink for heat dissipation and cooler operation in a n
Stacked Inductor Acts as Heat Sink
small package. The LTM4636-1 detects overtemperature n
Wide Input Voltage Range: 4.7V to 15V
and input/output overvoltage conditions and can trip an up- n
0.6V to 3.3V Output Voltage Range
stream power supply or circuit breaker to protect itself and n
±1.3% Total DC Output Voltage Error (–40°C to 125°C)
its load. The exposed inductor as a heat sink permits direct n
Differential Remote Sense Amplifier for Precision
contact with airflow from any direction. The LTM4636-1
Regulation
can deliver 40W (12VIN, 1VOUT, 40A, 200LFM) with only n
Current Mode Control/Fast Transient Response
40°C rise over the ambient temperature. Full-power 40W n
Frequency Synchronization
is delivered up to 83°C ambient and half-power 20W is n
Parallel Current Sharing (Up to 240A)
supported at 110°C ambient. n 88% Efficiency (12VIN, 1VOUT) at 40A The LTM4636-1 operates at 92%, 90% and 88% efficiency n Overcurrent Foldback Protection delivering 15A, 30A and 40A, respectively, to a 1V load n Overtemperature Shutdown (12VIN). The µModule regulator is scalable where four n 16mm × 16mm × 7.07mm BGA Package in current sharing deliver 160W with only 40°C rise and 88% efficiency (12VIN, 1VOUT, 400LFM). The LTM4636-1 APPLICATIONS is offered in 16mm × 16mm × 7.07mm BGA package. n All registered trademarks and trademarks are the property of their respective owners. Protected Telecom Servers and Networking Equipment by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, n Industrial Equipment and Medical Systems 6677210, 8163643. TYPICAL APPLICATION
12VIN , 1VOUT Efficiency at 350kHz vs Output Current 1V, 40A DC/DC µModule Regulator
100 UPSTREAM 4.5V TO 5.5V RANGE BIAS 95 BIAS REGULATOR VSYS VIN ≤ 5.5V, TIE VIN AND PVCC 61.9k 90 TOGETHER, TIE RUNP TO GND. 4.7V HOT SWAP V TO IN > 5.5V, THEN OPERATE AS SHOWN PV CIRCUIT INTV CC 15V CC BREAKER 100µF 22µF PV 85 CC 22µF 86.6k + 25V 16V V 15k IN INTV BIAS PV ×5 CC CC EFFICIENCY (%) OTP_SET 80 RUNC OVP_SET 0.1µF RUNP OPTIONAL CROWBAR CROWBAR 75 INTVCC HIZREG OVER_TEMP 0.01µF 100k OPTIONAL OVERTEMPERATURE OVP_TRIP AND OVERVOLTAGE FAULT SIGNAL 70 FREQ LTM4636-1 0 5 10 15 20 25 30 35 40 1V V V OUT OUT 34.8k TRACK/SS + 1V, 40A OUTPUT CURRENT (A) 46361 TA01b VOUTS1 MODE/PLLIN + 470µF 100µF SNSP1 6.3V 6.3V SNSP2 V – ×3 ×4 OUTS1 PINS NOT USED IN THIS CIRCUIT: COMPA CLKOUT, GMON, PGOOD, PHMODE, PWM, COMPB VFB SW, TEST1, TEST2, TEST3, TMON TEMP+ TEMP– SGND PGND 7.5k 46361 TA01a OPTIONAL TEMP MONITOR See the LTM4636 for simpler circuit and fewer features. 46361fa For more information www.linear.com/LTM4636-1 1