LTM4604A Datasheet, PDF (1/20 Pages) Linear Technology – Low Voltage, 4A DC/DC μModule with Tracking

LTM4604A
Low Voltage, 4A DC/DC
µModule with Tracking
FEATURES
■ _{Complete Standalone Power Supply}
■ _{±1.75% 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: IQ ≤ 7μA}
■ _{Overtemperature Protection}
■ _{Small and Very Low Profile Package:}
15mm × 9mm × 2.3mm LGA (0.630mm Pads)
APPLICATIONS
■ _{Telecom and Networking Equipment}
■ _Servers
■ _{Storage Cards}
■ _{ATCA Cards}
■ _{Industrial Equipment}
, 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.
DESCRIPTION
The LTM^®4604A is a complete 4A switch mode DC/DC
power supply with ±1.75% 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 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 capaci-
tors 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 (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.
Fault protection features include foldback current protec-
tion, thermal shutdown and a programmable soft-start
function. The LTM4604A is offered in a small thermally
enhanced 15mm × 9mm × 2.3mm LGA package and is
Pb free and RoHS compliant.
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
4604af
1