LTM4608 Datasheet, PDF (1/24 Pages) Linear Technology – Low VIN, 8A DC/DC μModuleTM with Tracking, Margining, and Frequency Synchronization

LTM4608
Low V_IN, 8A DC/DC
µModule^TM with Tracking, Margining,
and Frequency Synchronization
FEATURES
■ _{Complete Standalone Power Supply}
■ _{±1.5% Output Voltage Regulation}
■ _{2.375V 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 Surface Mount Footprint, Low Profile}
(15mm × 9mm × 2.8mm) LGA Package
APPLICATIONS
■ _{Telecom, Networking and Industrial Equipment}
■ _{Storage Systems}
■ _{Point of Load Regulation}
DESCRIPTION
The LTM^®4608 is a complete 8A switch mode DC/DC power
supply. Included in the package are the switching control-
ler, power FETs, inductor and all support components.
Operating over an input voltage range of 2.375V to 5.5V,
the LTM4608 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.
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
15mm × 9mm × 2.8mm LGA package. The LTM4608 is
Pb-free and RoHS compliant .
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. μModule is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
3V to 5.5V Input to 1.8V Output DC/DC μModule
CLKIN
V_IN
3V TO 5.5V
10μF
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
4608f
1