LTM4603-1_15 Datasheet, PDF (1/26 Pages) Linear Technology – 20V, 6A DC/DC Module Regulator with PLL, Output Tracking and Margining

Features
n _{Complete Switch Mode Power Supply}
n _{Wide Input Voltage Range: 4.5V to 20V}
n _{6A DC Typical, 8A Peak Output Current}
n _{0.6V to 5V Output Voltage}
n _{Output Voltage Tracking and Margining}
n _{Remote Sensing for Precision Regulation (LTM4603}
Only)
n _{Typical Operating Frequency: 1MHz}
n _{PLL Frequency Synchronization}
n _{1.5% Regulation}
n _{Current Foldback Protection (Disabled at Start-Up)}
n _{Pin Compatible with the LTM4601}
n _{Pb-Free (e4) RoHS Compliant Package with Gold}
Finish Pads
n _{Ultrafast Transient Response}
n _{Current Mode Control}
n _{Up to 93% Efficiency at 5VIN, 3.3VOUT}
n _{Programmable Soft-Start}
n _{Output Overvoltage Protection}
n _{Small Footprint, Low Profile (15mm × 15mm ×}
2.82mm) Surface Mount LGA Package
Applications
n _{Telecom and Networking Equipment}
n _Servers
n _{Industrial Equipment}
n _{Point of Load Regulation}
LTM4603/LTM4603-1
20V, 6A DC/DC µModule
Regulator with PLL, Output
Tracking and Margining
Description
The LTM^®4603 is a complete 6A step-down switch mode
DC/DC µModule^® regulator with onboard switching con-
troller, MOSFETs, inductor and all support components.
The device is housed in a small surface mount 15mm ×
15mm × 2.82mm LGA package. Operating over an input
voltage range of 4.5V to 20V, the LTM4603 supports an
output voltage range of 0.6V to 5V as well as output volt-
age tracking and margining. The high efficiency design
delivers 6A continuous current (8A peak). Only bulk input
and output capacitors are needed to complete the design.
The low profile (2.82mm) and light weight (1.7g) package
easily mounts on the unused space on the back side of
PC boards for high density point of load regulation. The
µModule regulator 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.
L, LT, LTC, LTM, Linear Technology, the Linear logo, 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.
Typical Application
1.5V/6A Power Supply with 4.5V to 20V Input
V_IN
4.5V TO 20V
C_IN
CLOCK SYNC
TRACK/SS CONTROL
ON/OFF
392k
V_IN
PGOOD
PLLIN TRACK/SS
V_OUT
RUN
COMP
INTV_CC
DRV_CC
MPGM
LTM4603
SGND PGND
V_FB
MARG0
MARG1
V_{OUT_LCL}
DIFFV_OUT
V_OSNS+
V_OSNS–
f_SET
100pF
MARGIN
CONTROL
40.2k
V_OUT
1.5V
6A
C_OUT
5% MARGIN
4603 TA01a
Efficiency vs Load Current with 12V_IN
100
95
90
85
80
75
70
65
60
55
50
45
40
01
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
2 34 5 6 7
LOAD CURRENT (A)
4603 TA01b
4603fb
1