LTM4637
20A DC/DC µModule
Step-Down Regulator
FeaTures
DescripTion
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The LTM®4637 is a complete 20A output high efficiency
switch mode step-down DC/DC µModule (micromodule)
regulator.Includedinthepackagearetheswitchingcontrol-
ler, power FETs, inductor and compensation components.
Operating over an input voltage range from 4.5V to 20V,
the LTM4637 supports an output voltage range of 0.6V
to 5.5V, set by a single external resistor. Only a few input
and output capacitors are needed.
Complete 20A Switch Mode Power Supply
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4.5V to 20V Input Voltage Range
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0.6V to 5.5V Output Voltage Range
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1.5ꢀ Total DC Output Voltage Error
(–40°C to 125°C)
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Differential Remote Sense Amplifier for Precision
Regulation for (V
≤ 3.3V)
OUT
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Current Mode Control/Fast Transient Response
Parallel Current Sharing (Up to 80A)
Frequency Synchronization
Current mode operation allows precision current sharing
of up to four LTM4637 regulators to obtain up to 80A
output. High switching frequency and a current mode
architecture enable a very fast transient response to line
and load changes without sacrificing stability. The device
supports frequency synchronization, multiphase/current
sharing,BurstModeoperationandoutputvoltagetracking
forsupplyrailsequencing.Adiode-connectedPNPtransis-
tor is available for use as an internal temperature monitor.
Selectable Pulse-Skipping or Burst Mode® Operation
Soft-Start/Voltage Tracking
Up to 88% Efficiency (12V , 1.8V
)
IN
OUT
Overcurrent Foldback Protection
Output Overvoltage Protection
Internal Temperature Monitor
Overtemperature Protection
15mm × 15mm × 4.32mm LGA and
15mm × 15mm × 4.92mm BGA Packages
TheLTM4637isofferedin15mm× 15mm× 4.32mmLGA
and 15mm × 15mm × 4.92mm packages. The LTM4637
is available with SnPb (BGA) or RoHS compliant terminal
finish.TheLTM4637ispincompatiblewiththeLTM4627,
a 15A DC/DC µModule regulator.
L, LT, LTC, LTM, PolyPhase, Burst Mode, µModule, Linear Technology, the Linear logo are
registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 6677210, 8163643.
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SnPb (BGA) or RoHS Compliant (LGA and BGA) Finish
applicaTions
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Telecom Servers and Networking Equipment
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Industrial Equipment
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Medical Systems
High Ambient Temperature Systems
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Typical applicaTion
12VIN, 1.2VOUT, 20A DC/DC µModule® Regulator
12VIN Efficiency vs Load Current
2.2µF
100
1.2V
250kHz
CCM
OUT
V
IN
12V
95
90
22µF
16V
×4
10k
PGOOD
V
EXTV
INTV
CC CC
IN
V
1.2V
20A
OUT
0.1µF
COMP
V
OUT
V
OUT_LCL
TRACK/SS
RUN
85
80
75
70
100µF*
6.3V
×2
+
330pF
470µF
6.3V
×2
DIFF_OUT
+
LTM4637
f
V
SET
OSNS
–
MODE_PLLIN
V
OSNS
TEMP
V
FB
SGND GND
R
**
FB
60.4k
65
* SEE TABLE 5
** SEE TABLE 1
4637 TA01a
8
10 12 14 16 18 20
0
6
2
4
OUTPUT CURRENT (A)
4637 TA01b
4637fc
1
For more information www.linear.com/LTM4637
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