LTM4636
40A DC/DC Module
Regulator
Fea T Descrip T
n
Stacked Inductor Acts as Heat Sink
The LTM 4636 is a 40A step-down Module (power
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Wide Input Voltage Range: 4.7V to 15V
module) switching regulator with a stacked inductor as a
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0.6V to 3.3V Output Voltage Range
heat sink for quicker heat dissipation and cooler operation
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1.3% Total DC Output Voltage Error Over Line,
in a small package. The exposed inductor permits direct
Load and Temperature (40C to 125C)
contact with airflow from any direction. The LTM4636
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Differential Remote Sense Amplifier for Precision
can deliver 40W (12V , 1V , 40A, 200LFM) with only
IN OUT
Regulation
40C rise over the ambient temperature. Full-power 40W
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Current Mode Control/Fast Transient Response
is delivered, up to 83C ambient and half-power 20W is
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Frequency Synchronization
supported at 110C ambient.
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Parallel Current Sharing (Up to 240A)
The LTM4636 operates at 92%, 90% and 88% efficiency,
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Internal or External Compensation
delivering 15A, 30A and 40A, respectively, to a 1V load
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88% Efficiency (12V , 1V ) at 40A
IN OUT
(12V ). The Module regulator is scalable such that four
IN
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Overcurrent Foldback Protection
Modules in current sharing mode deliver 160W with only
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16mm 16mm 7.07mm BGA Package
40C rise and 88% efficiency (12V , 1V , 400LFM).
IN OUT
The LTM4636 is offered in a 16mm 16mm 7.07mm
a T
BGA package.
L, LT, LTC, LTM, PolyPhase, Burst Mode, Module, Linear Technology, LTpowerCAD and the
n
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 a T
12V , 1V Efficiency
1V, 40A DC/DC Module Regulator
IN OUT
vs Output Current
V 5.5V, TIE V , INTV AND PV
IN IN CC CC 100
TOGETHER, TIE RUNP TO GND.
V > 5.5V, THEN OPERATE AS SHOWN
IN
PV
CC
4.70V TO 95
15V
PV
CC
INTV
CC
22F 22F
+
90
100F 15k
16V
V INTV PV
IN CC CC
25V
5
RUNC
85
LTM4636
0.1F
80
1V
V
OUT
V
RUNP
OUT
1V, 40A
INTV HIZREG
CC
+ 75
V
OUTS1
FREQ
+ 100F
470F
TRACK/SS
6.3V 6.3V
34.8k
70
MODE/PLLIN 4
3
0 15 20 25 30 35 40
5 10
V
OUTS1
OUTPUT CURRENT (A)
4636 TA01b
SNSP1
SNSP2
PINS NOT USED IN THIS CIRCUIT:
COMPA
CLKOUT, GMON, PGOOD, PHMODE, PWM, COMPB V
FB
SW, TEST1, TEST2, TEST3, TEST4, TMON +
TEMP TEMP SGND PGND
7.5k
4636 TA01a
OPTIONAL TEMP MONITOR
4636f
1
For more information www.linear.com/LTM4636
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTM4636
a T e Maxi Mu M r a T
(Note 1)
+
V , SW, HZBREG, RUNP ........................... 0.3V to 16V TEMP , TEMP .......................................... 0.3V to 0.8V
IN
V .......................................................... 0.3V to 3.5V INTV Peak Output Current (Note 6) ....................20mA
OUT CC
PGOOD, RUNC, TMON, PV , MODE/PLLIN, PHMODE, Internal Operating Temperature Range
CC
+
FREQ, TRACK/SS, TEST1, TEST2, V , V , (Note 2) .................................................. 40C to 125C
OUTS1 OUTS1
SNSP1, SNSP2, TEST3, TEST4 .....0.3V to INTV (5V) Storage Temperature Range .................. 55C to 125C
CC
V , COMPA, COMPB (Note 7) .................. 0.3V to 2.7V Reflow (Peak Body) Temperature .......................... 250C
FB
PV Additional Output Current ................0mA to 50mA
CC
Note: PWM, CLKOUT, and GMON are outputs only.
p c F T
TOP VIEW
+
V V COMPB
OUTS1 OUTS1
1 2 3 4 5 6 7 8 9 10 11 12
A
V
OUT
B
C
TRACK/SS
TEST4 (FLOAT PIN)
TEST2 RUNC
HIZREG D
PGOOD
V COMPA
GND
FB
PHASMD
SNSP1
E
RUNP
SNSP2
INTV
CC PV
CC
F
SGND
FREQ GND
NC TEMP
CLKOUT
+
G
TEMP
GMON
TEST3 TEST1 PWM TMON
H
MODE/PLLIN
GND
J
K
GND V SW
IN
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
VALUES DETERMINED PER JESD51-12
Note: = ( + )|| ; is Board to Ambient
JA JCbottom JBA JCtop JBA
o r D i n F Ma T