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LTM4608A
Low V IN , 8A DC/DC μModule
Regulator with Tracking, Margining,
and Frequency Synchronization
Complete Standalone Power Supply
± 1.75% Total DC Output Error (–55°C to 125°C)
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 Tracks Margining
Multiphase Operation
Parallel Current Sharing
Onboard Frequency Synchronization
Spread Spectrum Frequency Modulation
Overcurrent/Thermal Shutdown Protection
Current Mode Control/Fast Transient Response
Selectable Burst Mode ? Operation
Up to 95% Efficiency
Output Overvoltage Protection
Small, Low Profile 9mm × 15mm × 2.82mm
Telecom, Networking and Industrial Equipment
Storage Systems
Point of Load Regulation
FEATURES
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LGA Package (0.630mm Pads)
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, μModule and PolyPhase
are registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents
including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.
TYPICAL APPLICATION
DESCRIPTION
The LTM ? 4608A is a complete 8A switch mode DC/DC
power supply with ±1.75% total output voltage error. In-
cluded in the package are the switching controller, power
FETs, inductor and all support components. Operating
over an input voltage range of 2.7V to 5.5V, the LTM4608A
supports an output voltage range of 0.6V to 5V, set by a
single external resistor. This high efficiency design delivers
up to 8A continuous current (10A peak). Only bulk input
and output capacitors are needed to complete the design.
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 0.630mm LGA pads
with 1.27mm pitch simplify PCB layout by providing stan-
dard trace routing and via placement. The high switching
frequency and 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 surface mount LGA package.
The LTM4608A is RoHS compliant with Pb-free finish.
Efficiency vs Load Current
2.7V to 5.5V Input to 1.8V Output DC/DC μModule ? Regulator
CLKIN
100
95
V OUT = 1.8V
V IN
2.7V TO 5.5V
10μF
V IN
SV IN
SW
RUN
CLKIN
LTM4608A
V OUT
FB
I TH
I THM
4.87k
V OUT
1.8V
100μF
90
85
80
V IN = 3.3V
V IN = 5V
PLLLPF
TRACK
PGOOD
MGN
PGOOD
75
CLKOUT GND SGND
4608A TA01a
70
0
2
4 6
8
10
LOAD CURRENT (A)
4608A TA01b
4608afd
1
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