LTM4608A Datasheet, PDF (1/24 Pages) Linear Technology – Low VIN, 8A DC/DC μModule with Tracking, Margining, and Frequency Synchronization

LTM4608A
Low V_IN, 8A DC/DC
µModule with Tracking, Margining,
and Frequency Synchronization
FEATURES
■ _{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 × 2.8mm}
LGA Package (0.630mm Pads)
APPLICATIONS
■ _{Telecom, Networking and Industrial Equipment}
■ _{Storage Systems}
■ _{Point of Load Regulation}
, 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. Protected by U.S.
Patents, including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.
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 sup-
ports 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 (2.8mm) 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
15mm × 9mm × 2.8mm surface mount LGA package. The
LTM4608A is Pb-free and RoHS compliant.
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 ^LTM4608A I_THM
PLLLPF
PGOOD
4.87k
PGOOD
TRACK
MGN V_OUT
CLKOUT GND SGND
4608A TA01a
V_OUT
1.8V
100μF
Efficiency vs Load Current
100
V_OUT = 1.8V
95
V_IN = 3.3V
90
V_IN = 5V
85
80
75
70
0
2
4
6
8
10
LOAD CURRENT (A)
4608A TA01b
4608afa
1