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LTM4604A
Low Voltage, 4A DC/DC
μModule Regulator with Tracking
Complete Standalone Power Supply
± 1.75% Max Total DC Output Error (–40°C to 125°C)
Wide Input Voltage Range: 2.375V to 5.5V
4A DC, 5A Peak Output Current
0.8V to 5V Output
Output Voltage Tracking
UltraFast TM Transient Response
Power Good Indicator
Current Mode Control
Current Foldback Protection, Parallel/Current Sharing
Up to 95% Efficiency
Programmable Soft-Start
Micropower Shutdown: I Q ≤ 7μA
Overtemperature Protection
15mm × 9mm × 2.32mm LGA and
Telecom and Networking Equipment
Servers
Storage Cards
ATCA Cards
Industrial Equipment
FEATURES
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15mm × 9mm × 3.42mm BGA Packages
APPLICATIONS
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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.
TYPICAL APPLICATION
DESCRIPTION
The LTM ? 4604A is a complete 4A switch mode step-down
μModule ? regulator with ±1.75% maximum total output
voltage error. Included in the package are the switching
controller, power FETs, inductor and all support compo-
nents. Operating over an input voltage range of 2.375V to
5.5V, the LTM4604A supports an output voltage range of
0.8V to 5V, set by a single resistor. This high efficiency
design delivers up to 4A continuous current (5A peak).
Only bulk 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 in RoHS-compliant
15mm × 9mm LGA and BGA packages.
Efficiency vs Output Current
3.3V to 2.5V/4A μModule Regulator
V IN
3.3V
100
95
90
V IN = 3.3V
V OUT = 2.5V
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
85
80
75
70
65
0
1
2
3
4
1
For more information www.linear.com/LTM4604A
OUTPUT CURRENT (A)
4604A TA01b
4604afa
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