LTM4634_15 Datasheet, PDF (1/32 Pages) Linear Technology – Triple Output 5A/5A/4A Step-Down DC/DC Module Regulator

Features
n _{Three Independent High Efficiency Regulator}
Channels
n _{IOUT1,2 = 5A, IOUT3 = 4A}
n _{Input Voltage Range: 4.75V to 28V}
n _{Independent VIN for Each Channel}
n _{VOUT1,2 Voltage Range: 0.8V to 5.5V}
n _{VOUT3 Voltage Range: 0.8V to 13.5V}
n _{±1.5% Maximum Total DC Output Error}
n _{Current Mode Control/Fast Transient Response}
n _{Frequency Synchronization}
n _{Output Overvoltage and Overcurrent Protection}
n _PolyPhase^® _{Operation with Current Sharing}
n _{General Purpose Temperature Monitors}
n _{Soft-Start/Voltage Tracking}
n _{Power Good Monitors}
n _{SnPb or RoHS Compliant Finish}
n _{15mm × 15mm × 5.01mm BGA Package}
Applications
n _{Telecom, Networking and Industrial Equipment}
n _{High Density Point of Load Voltage Regulation}
LTM4634
Triple Output 5A/5A/4A
Step-Down DC/DC
µModule^® Regulator
Description
The LTM^®4634 integrates three complete 5A/5A/4A high
efficiency switching mode DC/DC converters into one small
package. Switching controllers, power FETs, inductors, and
most support components are included. Operating over an
input voltage range of 4.75V to 28V, the LTM4634 provides
three independent output voltages. V_OUT1 and V_OUT2 are
adjustable from 0.8V to 5.5V, while V_OUT3 is adjustable
from 0.8V to 13.5V. Each output voltage is set by a single
external resistor.
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 parallel opera-
tion, soft-start and output voltage tracking for supply rail
sequencing.
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.
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_IN
40k
5V
2Ω
V_IN1 V_IN2 V_IN3 EXTV_CC INTV_CC FREQ/PLLLPF
10k 10k
4.7µF
6.3V
CNTL_PWR
PGOOD12
RUN1
RUN2
1µF
RUN3
TK/SS1
TK/SS2
TK/SS3
LTM4634
PGOOD3
V_OUT1
3.3V
19.1k
V_FB1
V_OUT2
5V
11.5k
V_FB2
MODE/PLLIN GND SGND
V_OUT3
12V
4.32k
V_FB3
4634 TA01a
For more information www.linear.com/LTM4634
24V Input Efficiency
100
95
90
85
80
75
70
V_EXTVCC = 5V
24V to 3.3V EFF (750kHz) CH1
65
24V to 5V EFF (750kHz) CH2
24V to 12V EFF (750kHz) CH3
60
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
LOAD CURRENT (A)
4634 TA01b
4634f
1