LTM4604 Datasheet, PDF (1/20 Pages) Linear Technology – Low Voltage, 4A DC/DC μModuleTM with Tracking

LTM4604
Low Voltage, 4A DC/DC
µModule^TM with Tracking
FEATURES
■ _{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}
■ _{Power Good Indicator}
■ _{Current Mode Control}
■ _{Current Foldback Protection, Parallel/Current Sharing}
■ _{Up to 95% Efficiency}
■ _{Programmable Soft-Start}
■ _{Micropower Shutdown: IQ ≤ 7μA}
■ _{Overtemperature Protection}
■ _{Small and Very Low Profile Package:}
15mm × 9mm × 2.3mm LGA
APPLICATIONS
■ _{Telecom and Networking Equipment}
■ _Servers
■ _{Storage Cards}
■ _{ATCA Cards}
■ _{Industrial Equipment}
DESCRIPTION
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 efficiency design
delivers up to 4A continuous current (5A peak). Only bulk
output capacitors are needed to complete the design.
The low profile 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
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 space saving and
thermally enhanced 15mm × 9mm × 2.3mm LGA package
and is Pb free and RoHS compliant.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
μModule 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
4
OUTPUT CURRENT (A)
"$" /
4604f
1