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LTM4603-1

Description
6A DC/DC レModule with PLL, Output Tracking and Margining
File Size344KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTM4603-1 Overview

6A DC/DC レModule with PLL, Output Tracking and Margining

FEATURES
LTM4603/LTM4603-1
6A DC/DC µModule
with PLL, Output Tracking
and Margining
DESCRIPTIO
The LTM
®
4603 is a complete 6A step-down switch mode
DC/DC power supply with onboard switching controller,
MOSFETs, inductor and all support components. The
µModule
TM
is housed in a small surface mount 15mm
×
15mm
×
2.8mm LGA package. Operating over an input
voltage range of 4.5 to 20V, the LTM4603 supports an
output voltage range of 0.6V to 5V as well as output voltage
tracking and margining. The high efficiency design deliv-
ers 6A continuous current (8A peak). Only bulk input and
output capacitors are needed to complete the design.
The low profile (2.8mm) and light weight (1.73g) package
easily mounts on the unused space on the back side of
PC boards for high density point of load regulation. The
µModule can be synchronized with an external clock for
reducing undesirable frequency harmonics and allows
PolyPhase
®
operation for high load currents.
A high switching frequency and adaptive on-time current
mode architecture deliver a very fast transient response
to line and load changes without sacrificing stability. An
onboard remote sense amplifier can be used to accurately
regulate an output voltage independent of load current.
The onboard remote sense amplifier is not available in the
LTM4603-1. The LTM4603/LTM4603-1 are pin compatible
with the 12A LTM4601/LTM4601-1.
, LT, LTC, LTM and PolyPhase 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.
Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 20V
6A DC Typical, 8A Peak Output Current
0.6V to 5V Output Voltage
Output Voltage Tracking and Margining
Remote Sensing for Precision Regulation
(LTM4603 Only)
Typical Operating Frequency: 1MHz
PLL Frequency Synchronization
1.5% Regulation
Current Foldback Protection (Disabled at Start-Up)
Pin Compatible with the LTM4601
Pb-Free (e4) RoHS Compliant Package with Gold
Finish Pads
Ultrafast Transient Response
Current Mode Control
Up to 93% Efficiency at 5V
IN
, 3.3V
OUT
Programmable Soft-Start
Output Overvoltage Protection
Small Footprint, Low Profile (15mm × 15mm ×
2.8mm) Surface Mount LGA Package
APPLICATIO S
Telecom and Networking Equipment
Servers
Industrial Equipment
Point of Load Regulation
TYPICAL APPLICATIO
V
IN
4.5V TO 20V
V
IN
PGOOD
RUN
COMP
INTV
CC
DRV
CC
MPGM
SGND
Efficiency vs Load Current with 12V
IN
1.00
0.95
CLOCK SYNC
TRACK/SS CONTROL
EFFICIENCY (%)
0.90
0.85
V
OUT
1.5V
6A
0.80
0.75
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0
4603 TA01a
4603 TA01b
1.5V/6A Power Supply with 4.5V to 20V Input
PLLIN TRACK/SS
V
OUT
V
FB
MARG0
MARG1
V
OUT_LCL
DIFFV
OUT
V
OSNS+
V
OSNS–
f
SET
100pF
MARGIN
CONTROL
13.3k
ON/OFF
C
IN
LTM4603
C
OUT
392k
5% MARGIN
PGND
U
1
U
U
12V
IN
, 1.2V
OUT
12V
IN
, 1.5V
OUT
12V
IN
, 1.8V
OUT
12V
IN
, 2.5V
OUT
12V
IN
, 3.3V
OUT
12V
IN
, 5V
OUT
4
3
2
5
OUTPUT CURRENT (A)
6
7
4603f
1

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