LTM4636-1
40A Module Regulator
with Overvoltage/
Overtemperature Protection
FEATURES DESCRIPTION
n
Overtemperature, Input/Output Overvoltage The LTM 4636-1 is a 40A step-down Module (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
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Stacked Inductor Acts as Heat Sink small package. The LTM4636-1 detects overtemperature
n
and input/output overvoltage conditions and can trip an up-
Wide Input Voltage Range: 4.7V to 15V
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stream power supply or circuit breaker to protect itself and
0.6V to 3.3V Output Voltage Range
n
its load. The exposed inductor as a heat sink permits direct
1.3% Total DC Output Voltage Error (40C to 125C)
n
contact with airflow from any direction. The LTM4636-1
Differential Remote Sense Amplifier for Precision
can deliver 40W (12V , 1V , 40A, 200LFM) with only
Regulation
IN OUT
n 40C rise over the ambient temperature. Full-power 40W
Current Mode Control/Fast Transient Response
n is delivered up to 83C ambient and half-power 20W is
Frequency Synchronization
n supported at 110C ambient.
Parallel Current Sharing (Up to 240A)
n
88% Efficiency (12V , 1V ) at 40A
IN OUT 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
(12V ). The Module regulator is scalable where four
IN
n
16mm 16mm 7.07mm BGA Package
in current sharing deliver 160W with only 40C rise and
88% efficiency (12V , 1V , 400LFM). The LTM4636-1
IN OUT
APPLICATIONS is offered in 16mm 16mm 7.07mm BGA package.
All registered trademarks and trademarks are the property of their respective owners. Protected
n
Telecom Servers and Networking Equipment
by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611,
n 6677210, 8163643.
Industrial Equipment and Medical Systems
12V , 1V Efficiency at
TYPICAL APPLICATION IN OUT
350kHz vs Output Current
1V, 40A DC/DC Module Regulator
100
UPSTREAM
4.5V TO 5.5V RANGE BIAS
95
BIAS
REGULATOR
V
SYS
V 5.5V, TIE V AND PV
IN IN CC
61.9k
90
TOGETHER, TIE RUNP TO GND.
4.7V
V > 5.5V, THEN OPERATE AS SHOWN
HOT SWAP IN
PV
TO CC
INTV
CIRCUIT CC
15V
PV 85
100F 22F
BREAKER CC 22F 86.6k
+ 25V 16V
V INTV BIAS PV
IN CC CC
15k
5
80
OTP_SET
RUNC
OVP_SET
0.1F
RUNP OPTIONAL CROWBAR
CROWBAR 75
INTV HIZREG
CC
OVER_TEMP
0.01F 100k
OPTIONAL OVERTEMPERATURE
OVP_TRIP
70
AND OVERVOLTAGE FAULT SIGNAL
0 5 10 15 20 25 30 35 40
FREQ LTM4636-1
1V
V
OUT
V
OUT
TRACK/SS OUTPUT CURRENT (A)
+ 1V, 40A 46361 TA01b
34.8k
V
OUTS1
MODE/PLLIN
+
470F 100F
SNSP1
6.3V
6.3V
SNSP2
3
4
V
OUTS1
PINS NOT USED IN THIS CIRCUIT:
COMPA
V
CLKOUT, GMON, PGOOD, PHMODE, PWM, COMPB FB
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
1
For more information www.linear.com/LTM4636-1
EFFICIENCY (%)LTM4636-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
V , SW, HZBREG, RUNP, OVR_TRIP, PV Additional Output Current ................0mA to 50mA
IN CC
+
OVER TEMP ............................................... 0.3V to 16V TEMP , TEMP .......................................... 0.3V to 0.8V
V .......................................................... 0.3V to 3.5V INTV Peak Output Current (Note 6) ....................20mA
OUT CC
PGOOD, RUNC, TMON, PV , MODE/PLLIN, Internal Operating Temperature Range
CC
PHMODE, FREQ, TRACK/SS, TEST1, TEST2, (Note 2) .................................................. 40C to 125C
+
V , V , SNSP1, SNSP2, TEST3, Storage Temperature Range .................. 55C to 125C
OUTS1 OUTS1
OVP_SET, CROWBAR ....................0.3V to INTV (5V) Reflow (Peak Body) Temperature .......................... 250C
CC
V , COMPA, COMPB (Note 6) .................. 0.3V to 2.7V
FB
BIAS ............................................................. 0.3V to 6V Note: PWM, CLKOUT, and GMON are outputs only.
PIN CONFIGURATION
TOP VIEW
+
V V COMPB
OUTS1 OUTS1
1 2 3 4 5 6 7 8 9 10 11 12
A
V
OUT
B
OVER_TEMP
TRACK/SS C
OVP_TRIP
TEST2
RUNC
CROWBAR
D
HIZREG PGOOD
OVP_SET
V COMPA GND
FB
SNSP1 PHMODE
E
RUNP
SNSP2
INTV
CC
PV
CC
F
SGND
OTP_SET
FREQ GND BIAS
CLKOUT
TEMP
G
+
TEMP
PWM TMON
TEST3 TEST1
GMON
H
MODE/PLLIN
GND
J
K
V
GND IN SW
L
M
BGA PACKAGE
144-LEAD (16mm 16mm 7.07mm)
T = 125C, = 7.5C/W, = 3C/W, = 15C/W, = 12C/W
JMAX JA JCbottom JCtop JBA
= DERIVED FROM 95mm 76mm PCB WITH 6 LAYERS, WEIGHT = 3.95g
JA
V ALUES DETERMINED PER JESD51-12
Note: = ( + )|| ; is Board to Ambient
JA JCbottom JBA JCtop JBA
ORDER INFORMATION