LTM4620 Datasheet, PDF (1/36 Pages) Linear Technology – Dual 13A or Single 26A DC/DC μModule Regulator

LTM4620
Dual 13A or Single 26A
DC/DC µModule Regulator
Features
n _{Complete Standalone Dual Output Power Supply}
n _{Dual 13A or Single 26A Output}
n _{Wide Input Voltage Range: 4.5V to 16V}
n _{Output Voltage Range: 0.6V to 2.5V}
n _{±1.5% Maximum Total DC Output Error}
n _{Multiphase Current Sharing with Multiple}
LTM4620s Up to 100A
n _{Differential Remote Sense Amplifier}
n _{Current Mode Control/Fast Transient Response}
n _{Adjustable Switching Frequency}
n _{Overcurrent Foldback Protection}
n _{Frequency Synchronization}
n _{Internal Temperature Sensing Diode Output}
n _{Output Overvoltage Protection}
n _{Low Profile (15mm × 15mm × 4.41mm) LGA Package}
Applications
n _{Telecom and Networking Equipment}
n _{Storage and ATCA Cards}
n _{Industrial Equipment}
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 _{100A and 26A Thermal Performance}
 _{Current Sharing}
 _{Short-Circuit Protection}
Description
The LTM^®4620 is a complete dual 13A output switching
mode DC/DC power supply. 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 16V, the LTM4620 supports two outputs
each with an output voltage range of 0.6V to 2.5V, set by a
single external resistor. Its high efficiency design delivers
up to 13A 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 overcur-
rent protection. The power module is offered in a proprietary
space saving and thermally enhanced 15mm × 15mm ×
4.41mm LGA package with integrated top-side heat sink.
The LTM4620 is RoHS compliant with a PB-free finish.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase are
registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
Typical Application
26A, 1.2V Output DC/DC µModule^® Regulator
4.7µF
INTV_CC
5k
V_IN 4.5V TO 16V
10k*
22µF
×4
120k
25V
5.1V*
0.1µF
121k
* PULL-UP RESISTOR AND
ZENER ARE OPTIONAL
MODE_PLLIN CLKOUT INTV_CC
V_IN
TEMP
RUN1
RUN2
TRACK1
TRACK2
f_SET
PHASMD
LTM4620
SGND GND
DIFFP
EXTV_CC PGOOD1
V_OUT1
V_OUTS1
DIFFOUT
SW1
V_FB1
V_FB2
COMP1
COMP2
V_OUTS2
V_OUT2
SW2
PGOOD2
DIFFN
PGOOD
100µF ⁺
6.3V
470µF
6.3V
60.4k
100µF ⁺
6.3V
470µF
6.3V
V_OUT
1.2V AT 26A
PGOOD
4620 TA01a
1.2V Efficiency vs I_OUT
90
80
70
60
50
5V_IN /500kHz
12V_IN/500kHz
40
0 2 4 6 8 10 12 14 16 18 20 22 24 26
OUTPUT CURRENT (A)
4620 TA01b
4620f
1