LTM4608_1 Datasheet, PDF (1/26 Pages) Linear Technology – Low VIN, 8A DC/DC Module Regulator with Tracking, Margining, and Frequency Synchronization

LTM4608
Low V_IN, 8A DC/DC µModule
Regulator with Tracking, Margining,
and Frequency Synchronization
FEATURES
n _{Complete Standalone Power Supply}
n _{±1.5% Output Voltage Regulation}
n _{2.7V to 5.5V Input Voltage Range}
n _{8A DC, 10A Peak Output Current}
n _{0.6V Up to 5V Output}
n _{Output Voltage Tracking and Margining}
n _{Power Good Tracking and Margining}
n _{Multiphase Operation}
n _{Parallel Current Sharing}
n _{Onboard Frequency Synchronization}
n _{Spread Spectrum Frequency Modulation}
n _{Overcurrent/Thermal Shutdown Protection}
n _{Small Surface Mount Footprint, Low Profile}
(9mm × 15mm × 2.8mm) LGA Package
APPLICATIONS
n _{Telecom, Networking and Industrial Equipment}
n _{Storage Systems}
n _{Point of Load Regulation}
For easier board layout and PCB assembly due to in-
creased spacing between land grid pads, please refer
to the LTM4608A.
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 (2.8mm) 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 × 2.8mm LGA package. The LTM4608 is
Pb-free and RoHS compliant.
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.
TYPICAL APPLICATION
2.7V to 5.5V Input to 1.8V Output DC/DC µModule^® Regulator
V_IN
2.7V TO 5.5V
10µF
CLKIN
CLKIN
V_IN
V_OUT
SV_IN
FB
SW
I_TH
RUN ^LTM4608 I_THM
PLLLPF
PGOOD
4.87k
PGOOD
TRACK
MGN V_OUT
CLKOUT GND SGND
4608 TA01a
V_OUT
1.8V
100µF
Efficiency vs Load Current
100
95
V_IN = 3.3V
90
V_IN = 5V
85
80
75
70
0
V_OUT = 1.8V
2
4
6
8
10
LOAD CURRENT (A)
4608 TA01b
4608fc
1