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LTM4608
Low V IN , 8A DC/DC μModule
Regulator with Tracking, Margining,
and Frequency Synchronization
Complete Standalone Power Supply
± 1.5% Output Voltage Regulation
2.7V to 5.5V Input Voltage Range
8A DC, 10A Peak Output Current
0.6V Up to 5V Output
Output Voltage Tracking and Margining
Power Good Tracking and Margining
Multiphase Operation
Parallel Current Sharing
Onboard Frequency Synchronization
Spread Spectrum Frequency Modulation
Overcurrent/Thermal Shutdown Protection
Small Surface Mount Footprint, Low Profile
Telecom, Networking and Industrial Equipment
Storage Systems
Point of Load Regulation
FEATURES
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(9mm × 15mm × 2.82mm) LGA Package
APPLICATIONS
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For easier board layout and PCB assembly due to in-
creased spacing between land grid pads, please refer
to the LTM4608A.
TYPICAL APPLICATION
2.7V to 5.5V Input to 1.8V Output DC/DC μModule ? Regulator
DESCRIPTION
The LTM ? 4608 is a complete 8A switch mode DC/DC
power supply. Included in the package are the switching
controller, power FETs, inductor and all support compo-
nents. Operating over an input voltage range of 2.7V to
5.5V, the LTM4608 supports an output voltage range of
0.6V to 5V, set by a single external resistor. This high ef-
ficiency design delivers up to 8A continuous current (10A
peak). Only bulk input and output capacitors are needed.
The low profile package (2.82mm) enables utilization
of unused space on the back side of PC boards for high
density point-of-load regulation. The 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 frequency syn-
chronization, programmable multiphase and/or spread
spectrum operation, output voltage tracking for supply
rail sequencing and voltage margining.
Fault protection features include overvoltage protection,
overcurrent protection and thermal shutdown. The power
module is offered in a compact and thermally enhanced
9mm × 15mm × 2.82mm LGA package. The LTM4608 is
RoHS compliant with Pb-free finish.
L , LT, LTC, LTM, Linear Technology, the Linear logo, μModule, Burst Mode and PolyPhase are
registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Efficiency vs Load Current
100
CLKIN
95
V IN
2.7V TO 5.5V
10μF
V IN
SV IN
SW
RUN
CLKIN
LTM4608
V OUT
FB
I TH
I THM
4.87k
V OUT
1.8V
100μF
90
85
V IN = 3.3V
V IN = 5V
PLLLPF
PGOOD
PGOOD
80
TRACK MGN
CLKOUT GND SGND
4608 TA01a
75
70
0
2
4 6
V OUT = 1.8V
8 10
LOAD CURRENT (A)
4608 TA01b
4608fd
1
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