LTM4631 Datasheet, PDF (1/32 Pages) Linear Technology – Ultrathin Dual 10A or Single 20A DC/DC μModule Regulator

LTM4631
Ultrathin Dual 10A or Single 20A
DC/DC µModule Regulator
FEATURES
n _{Dual 10A or Single 20A Output}
n _{Input Voltage Range: 4.5V to 15V}
n _{Output Voltage Range: 0.6V to 1.8V}
n _{±1.5% Maximum Total DC Output Error Over Line,}
Load and Temperature
n _{Differential Remote Sense Amplifier}
n _{Current Mode Control/Fast Transient Response}
n _{Adjustable Switching Frequency}
n _{Overcurrent Foldback Protection}
n _{Multiphase Parallel Current Sharing with Multiple}
LTM4631s
n _{Frequency Synchronization}
n _{Internal Temperature Monitor}
n _{Selectable Burst Mode}^® _Operation
n _{Soft-Start/Voltage Tracking}
n _{Output Overvoltage Protection}
n _{Ultrathin 16mm × 16mm × 1.91mm LGA Package}
APPLICATIONS
n _{Telecom and Networking Equipment}
n _{Storage and ATCA Cards}
n _{Industrial Equipment}
DESCRIPTION
The LTM^®4631 is a dual 10A or single 20A output switching
mode step-down DC/DC µModule^® (power module) regulator.
Included in the package are the switching controller, power
FETs, inductors and all supporting components. Operating
from an input voltage range of 4.5V to 15V, the LTM4631
supports two outputs each with an output voltage range of
0.6V to 1.8V, each set by a single external resistor. Its high
efficiency design delivers up to 10A continuous current
for each output. Only a few input and output capacitors
are needed.
The device supports frequency synchronization, multi-
phase operation, Burst Mode operation and output voltage
tracking for supply rail sequencing and has an onboard
temperature diode for device temperature monitoring. High
switching frequency and a current mode architecture enable
a very fast transient response to line and load changes
without sacrificing stability.
Fault protection features include overvoltage and
overcurrent protection. The LTM4631 is offered in an
ultrathin 16mm × 16mm × 1.91mm LGA package. The
LTM4631 is Pb-free and ROHS compliant.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered 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 and 6580258. Other patents pending.
TYPICAL APPLICATION
20A, 1.2V Output Ultrathin µModule Regulator
INTV_CC
4.7µF 10k
V_IN
4.5V TO 15V
22µF
25V 120k
×4
0.1µF
PINS NOT USED IN THIS CIRCUIT:
CLKOUT
EXTV_CC
SW1
SW2
V_OUTS2
147k
MODE_PLLIN INTV_CC
V_IN
TEMP
TRACK1
TRACK2
f_SET
PHASMD
SGND
LTM4631
GND
PGOOD1
V_OUT1
V_OUTS1
DIFFOUT
V_FB1
V_FB2
PGOOD
100µF ⁺
6.3V
60.4k
470µF
6.3V
DIFFP
V_OUT2
PGOOD2
DIFFN
PGOOD
100µF ⁺
6.3V
V_OUT
1.2V
20A
470µF
6.3V
4631 TA01a
For more information www.linear.com/LTM4631
1.2V Output Efficiency
vs Load Current
90
85
80
75
70
5V INPUT
12V INPUT
65
0
2
4
6
8
10
LOAD CURRENT (A)
3060 TA01b
4631f
1