LTM4604A_15 Datasheet, PDF (1/22 Pages) Linear Technology – Low Voltage, 4A DC/DC Module Regulator with Tracking

LTM4604A
Low Voltage, 4A DC/DC
µModule Regulator with Tracking
Features
n _{Complete Standalone Power Supply}
n _{±1.75% Max Total DC Output Error (–40°C to 125°C)}
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 _UltraFast^TM _{Transient Response}
n _{Power Good Indicator}
n _{Current Mode Control}
n _{Current Foldback Protection, Parallel/Current Sharing}
n _{Up to 95% Efficiency}
n _{Programmable Soft-Start}
n _{Micropower Shutdown: IQ ≤ 7µA}
n _{Overtemperature Protection}
n _{9mm × 15mm × 2.32mm LGA and}
9mm × 15mm × 3.42mm BGA Packages
Applications
n _{Telecom and Networking Equipment}
n _Servers
n _{Storage Cards}
n _{ATCA Cards}
n _{Industrial Equipment}
L, LT, LTC, LTM, Linear Technology, LTspice, µModule and the Linear logo are registered
trademarks and UltraFast and LTpowerCAD are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Description
The LTM^®4604A is a complete 4A switch mode step-down
µModule^® (micromodule) regulator with ±1.75% maximum
total output voltage error. Included in the package are the
switching controller, power FETs, inductor and all support
components. Operating over an input voltage range of
2.375V to 5.5V, the LTM4604A supports an output volt-
age range of 0.8V to 5V, set by a single resistor. This high
efficiency design delivers up to 4A continuous current
(5A peak). Only input and output capacitors are needed
to complete the design.
The 0.630mm LGA pads with 1.27mm pitch simplify
PCB layout by providing standard trace routing and via
placement. (The LTM4604A has smaller pads than the
LTM4604). The low profile package 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.
Fault protection features include foldback current protec-
tion, thermal shutdown and a programmable soft-start
function. The LTM4604A is offered with SnPb (BGA) or
RoHS-compliant terminal finish.
Typical Application
3.3V to 2.5V/4A µModule Regulator
V_IN
3.3V
10µF
6.3V
V_IN
PGOOD V_OUT
LTM4604A
COMP
FB
RUN/SS TRACK
GND
V_IN
2.37k
V_OUT
2.5V
4A
22µF
6.3V
×2
4604A 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
4604A TA01b
For more information www.linear.com/LTM4604A
4604afc
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