LTM4608A
Low V , 8A DC/DC µModule
IN
Regulator with Tracking, Margining,
and Frequency Synchronization
FEATURES
DESCRIPTION
TheLTM®4608Aisacomplete8AswitchmodeDC/DCpower
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Complete Standalone Power Supply
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±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
supply with ±±.ꢀ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.ꢀV to 7.7V, the LTM4608A sup-
ports an output voltage range of 0.6V to 7V, set by a single
external resistor. This high efficiency design delivers up
to 8A continuous current (±0A peak). Only bulk input and
output capacitors are needed to complete the design.
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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 975 Efficiency
Output Overvoltage Protection
9mm × ±7mm × 2.82mm LGA and
9mm × ±7mm × 3.42mm BGA Packages
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 ±.2ꢀmm 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.
APPLICATIONS
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Telecom, Networking and Industrial Equipment
Fault protection features include overvoltage protec-
tion, overcurrent protection and thermal shutdown. The
LTM4608A is offered in 9mm × ±7mm × 2.82mm LGA and
9mm ×±7mm ×3.42mm BGA packages. The LTM4608A is
availablewithSnPb(BGA)orRoHScompliantterminalfinish.
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Storage Systems
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Point of Load Regulation
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 748±±ꢀ8, 6780278, 6304066, 6±2ꢀ8±7, 6498466, 66±±±3±.
TYPICAL APPLICATION
Efficiency vs Load Current
100
2.7V to 5.5V Input to 1.8V Output DC/DC µModule® Regulator
V
= 1.8V
OUT
CLKIN
95
V
= 3.3V
IN
CLKIN
V
V
IN
2.7V TO 5.5V
OUT
1.8V
90
85
V
V
IN
OUT
V
= 5V
IN
SV
FB
IN
10µF
100µF
4.87k
SW
I
TH
LTM4608A
RUN
I
THM
80
75
70
PGOOD
PLLLPF
TRACK
PGOOD
MGN
CLKOUT GND SGND
4608A TA01a
0
2
4
6
8
10
LOAD CURRENT (A)
4608A TA01b
4608afe
1
For more information www.linear.com/LTM4608A
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