POWER LOSS (W)
LTM4643
Ultrathin Quad Module
Regulator with Configurable
3A Output Array
FEATURES DESCRIPTION
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Quad Output Step-Down Module Regulator with The LTM 4643 is a quad DC/DC step-down Module
3A per Output (power module) regulator with 3A per output. Outputs can
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Wide Input Voltage Range: 4V to 20V be paralleled in an array for up to 12A capability. Included
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2.375V to 20V with External Bias in the package are the switching controllers, power FETs,
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0.6V to 3.3V Output Voltage inductors and support components. Operating over an
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3A DC Output Current Each Channel input voltage range of 4V to 20V or 2.375V to 20V with
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1.5% Total Output Voltage Regulation an external bias supply, the LTM4643 supports an output
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Current Mode Control, Fast Transient Response voltage range of 0.6V to 3.3V each set by a single external
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Parallelable for Higher Output Current resistor. Its high efficiency design delivers 3A continuous
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Output Voltage Tracking output current per channel. Only bulk input and output
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Internal Temperature Sensing Diode Output capacitors are needed.
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External Frequency Synchronization
Fault protection features include overvoltage, overcurrent
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Overvoltage, Current and Temperature Protection
and overtemperature protection. The LTM4643 is offered
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9mm 15mm 1.82mm LGA and 9mm 15mm
in a 9mm 15mm 1.82mm LGA and 9mm 15mm
2.42mm BGA Packages
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2.42mm BGA packages with SnPb (BGA) or RoHS compli
ant terminal finish.
APPLICATIONS
Configurable Output Array*
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FPGAs, GPUs and ASICs Applications
3A
6A
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PCIe and Backside PCB Mounting 3A 9A
12A
3A 3A
All registered trademarks and trademarks are the property of their respective owners.
3A 3A 3A
* Note 4
TYPICAL APPLICATION
4V to 20V Input, Quad 0.9V, 1V, 1.2V and
1.5V Output DC/DC Module Regulator
1.5V Output Efficiency and
Power Loss (Each Channel)
CLKIN CLKOUT
95 1.6
4V to 20V V V 1.5V/3A
IN1 OUT1
22F
SVIN1 FB1 47F
90 1.4
2
4V
RUN1 PGOOD1 40.2k
25V
LTM4643
85 1.2
V V 1.2V/3A
IN2 OUT2
80 1.0
SVIN2 FB2
47F
4V
RUN2 PGOOD2 60.4k
75 0.8
V V
1V/3A 70 0.6
IN3 OUT3
SVIN3 FB3
47F
65 0.4
RUN3 PGOOD3 90.9k 4V
60 V = 5V 0.2
IN
V V
0.9V/3A V = 12V
IN4 OUT4 IN
SVIN4 FB4 55 0.0
47F
0 0.5 1 1.5 2 2.5 3
RUN4 PGOOD4 121k 4V
LOAD CURRENT (A)
TEMP SGND GND
4643 TA01b
4643 TA01a
NOT ALL PINS
ARE SHOWN
Rev C
1
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EFFICIENCY (%)LTM4643
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Note 1)
TOP VIEW
V , SV (Per Channel) .............................. 0.3V to 22V
V TRACK/SS1
IN IN IN1
1 2 3 4 5 6 7
V (Per Channel) (Note 3) ............0.3V to SV or 6V
OUT IN
VOUT1 GND FB1
RUN (Per Channel) ..................................... 0.3V to 22V A
SV
IN1
GND
MODE1
INTV (Per Channel) ............................... 0.3V to 3.6V
CC B COMP1
RUN1
PGOOD, MODE, TRACK/SS,
CLKIN
C
V PGOOD2 PGOOD1 INTV
OUT2 CC1
TRACK/SS2
FB (Per Channel) ...................................0.3V to INTV
CC
D FB2
SV
IN2
GND
CLKOUT (Note 3), CLKIN .......................0.3V to INTV
CC MODE2
COMP2
E
Internal Operating Temperature Range V
IN2 RUN2
SGND
F
(Notes 2, 5) ............................................ 40C to 125C
V PGOOD3 TEMP INTVCC2
OUT3
TRACK/SS3
G FB3
Storage Temperature Range .................. 65C to 150C
SV
IN3
GND
MODE3
COMP3
H
Peak Solder Reflow Body Temperature .................260C
V
IN3 INTV RUN3
CC3
FB4
J
V PGOOD4 CLKOUT
OUT4
TRACK/SS4
RUN4
K
INTV
GND CC4
L
COMP4
V
IN4 SV MODE4
IN4
LGA PACKAGE (WEIGHT = 0.70g)
77-LEAD (9mm 15mm 1.82mm)
BGA PACKAGE (WEIGHT = 0.83g)
77-LEAD (9mm 15mm 2.42mm)
T = 125C, = 17C/W, = 2.75C/W,
JMAX JCtop JCbottom
+ = 11C/W, = 10C/W
JB BA JA
VALUES PER JESD 51-12