LTM4604_15 Datasheet, PDF (1/20 Pages) Linear Technology – Low Voltage, 4A DC/DC Module Regulator with Tracking

Features
n _{Complete Standalone Power Supply}
n _{Wide Input Voltage Range: 2.375V to 5.5V}
n _{4A DC, 5A Peak Output Current}
n _{0.8V to 5V Output}
n _{Output Voltage Tracking}
n _{±2% Maximum Total DC Output Error}
n _UltraFast^TM _{Transient Response}
n _{Current Mode Control}
n _{Current Foldback Protection, Parallel/Current Sharing}
n _{Small and Very Low Profile Package:}
15mm × 9mm × 2.32mm LGA
Applications
n _{Telecom and Networking Equipment}
n _{Servers, ATCA Cards}
n _{Industrial Equipment}
Please refer to the LTM4604A for easier PC board layout
and assembly due to increased spacing between land
grid pads.
LTM4604
Low Voltage, 4A DC/DC
µModule Regulator
with Tracking
Description
The LTM^®4604 is a complete 4A switch mode step-down
µModule^® (micromodule) regulator. Included in the pack-
age are the switching controller, power FETs, inductor and
all support components. Operating over an input voltage
range of 2.375V to 5.5V, the LTM4604 supports an output
voltage range of 0.8V to 5V, set by a single resistor. This
high efficiency design delivers up to 4A continuous cur-
rent (5A peak). Only bulk input and output capacitors are
needed to complete the design.
The low profile package (2.32mm) enables utilization of
unused space on the bottom of PC boards for high density
point of load regulation. 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 output voltage tracking for
supply rail sequencing.
Fault protection features include foldback current protec-
tion, thermal shutdown and a programmable soft-start
function. The LTM4604 is offered in a RoHS compliant
15mm × 9mm × 2.32mm LGA package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks
and LTpowerCAD, LTspice and UltraFast are trademarks of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
Typical Application
3.3V to 2.5V/4A µModule Regulator
V_IN
3.3V
10µF
6.3V
V_IN
PGOOD V_OUT
LTM4604
COMP
FB
RUN/SS TRACK
GND
V_IN
2.37k
V_OUT
2.5V
4A
22µF
6.3V
×2
4604 TA01a
Efficiency vs Output Current
100
V_IN = 3.3V
95
V_OUT = 2.5V
90
85
80
75
70
65
0
1
2
3
OUTPUT CURRENT (A)
4
4604 G02
For more information www.linear.com/LTM4604
4604fb
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