LTM4634
Triple Output 5A/5A/4A
Step-Down DC/DC
®
µModule Regulator
FeaTures
DescripTion
The LTM®4634 integrates three complete 5A/5A/4A high
efficiencyswitchingmodeDC/DCconvertersintoonesmall
package.Switchingcontrollers,powerFETs,inductors,and
mostsupportcomponentsareincluded.Operatingoveran
inputvoltagerangeof4.75Vto28V, theLTM4634provides
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Three Independent High Efficiency Regulator
Channels
OUT1,2
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I
= 5A, I
= 4A
OUT3
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Input Voltage Range: 4.75V to 28V
Independent V for Each Channel
IN
V
V
Voltage Range: 0.8V to 5.5V
three independent output voltages. V
adjustable from 0.8V to 5.5V, while V
from 0.8V to 13.5V. Each output voltage is set by a single
external resistor.
and V
OUT3
are
OUT1,2
OUT1
OUT2
is adjustable
Voltage Range: 0.8V to 13.5V
OUT3
1.5ꢀ ꢁaꢂiꢃuꢃ Total DC Output Error
Current ꢁode Control/Fast Transient Response
Frequency Synchronization
Highswitchingfrequencyandacurrentmodearchitecture
enable a very fast transient response to line and load
changes without sacrificing stability. The device supports
frequency synchronization, multiphase parallel opera-
tion, soft-start and output voltage tracking for supply rail
sequencing.
Output Overvoltage and Overcurrent Protection
PolyPhase® Operation with Current Sharing
General Purpose Teꢃperature ꢁonitors
Soft-Start/Voltage Tracking
Power Good Monitors
SnPb or RoHS Compliant Finish
15mm × 15mm × 5.01mm BGA Package
Fault protection features include overvoltage protection,
overcurrent protection and temperature monitoring. The
power module is offered in a space saving, thermally
enhanced 15mm × 15mm × 5.01mm BGA package. The
LTM4634 is available with SnPb (BGA) or RoHS compliant
terminal finish.
applicaTions
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Telecom, Networking and Industrial Equipment
High Density Point of Load Voltage Regulation
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L, LT, LTC, LTM, µModule, PolyPhase, Burst Mode, Linear Technology and the Linear logo
are registered trademarks and PowerPath, LTpowerCAD and UltraFast are trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6100678, 6144194,
6177787, 6304066, 6580258 and 8163643. Other patents pending.
Typical applicaTion
24V Input to 3.3V, 5V and 12V Output Regulator
24V Input Efficiency
100
95
90
85
80
75
70
65
60
5V
24V
IN
4.7µF
6.3V
2Ω
40k
10k
10k
V
V
V
IN3
EXTV
INTV
FREQ/PLLLPF
CC
IN1
IN2
CC
CNTL_PWR
RUN1
PGOOD12
PGOOD3
3.3V
5V
V
V
V
OUT1
RUN2
19.1k
1µF
V
RUN3
FB1
LTM4634
TK/SS1
TK/SS2
TK/SS3
OUT2
11.5k
4.32k
V
= 5V
EXTVCC
V
FB2
24V to 3.3V EFF (750kHz) CH1
24V to 5V EFF (750kHz) CH2
24V to 12V EFF (750kHz) CH3
12V
OUT3
V
FB3
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
MODE/PLLIN GND SGND
LOAD CURRENT (A)
4634 TA01a
4634 TA01b
4634f
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For more information www.linear.com/LTM4634