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LTM4604
Low Voltage, 4A DC/DC
μModule ? Regulator
with Tracking
FEATURES
DESCRIPTION
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Complete Standalone Power Supply
Wide Input Voltage Range: 2.375V to 5.5V
4A DC, 5A Peak Output Current
0.8V to 5V Output
Output Voltage Tracking
± 2% Total DC Error
UltraFast TM Transient Response
Current Mode Control
Current Foldback Protection, Parallel/Current Sharing
Small and Very Low Pro?le Package:
15mm × 9mm × 2.3mm LGA
The LTM ? 4604 is a complete 4A switch mode DC/DC power
supply. Included in the package are the switching control-
ler, 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 ef?ciency design
delivers up to 4A continuous current (5A peak). Only bulk
output capacitors are needed to complete the design.
The low pro?le package (2.3mm) 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
Telecom and Networking Equipment
Servers, ATCA Cards
Industrial Equipment
APPLICATIONS
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For easier PC board layout and assembly due to in-
creased spacing between land grid pads, please refer
to the LTM4604A.
TYPICAL APPLICATION
3.3V to 2.5V/4A μModule Regulator
response to line and load changes without sacri?cing
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 space saving and
thermally enhanced 15mm × 9mm × 2.3mm LGA package
and is Pb free and RoHS compliant.
L , LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks of
Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Ef?ciency vs Output Current
10μF
6.3V
V IN
3.3V
100
95
90
V IN = 3.3V
V OUT = 2.5V
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
85
80
75
70
4604 TA01a
65
0
1
2
3
4
OUTPUT CURRENT (A)
4604 G02
4604fa
1
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