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LTM4603HV
6A, 28V IN DC/DC μModule
with PLL, Output Tracking
and Margining
FEATURES
DESCRIPTIO
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Complete Switch Mode Power Supply
Wide Input Voltage Range: 4.5V to 28V
6A DC Typical, 8A Peak Output Current
0.6V to 5V Output Voltage
Output Voltage Tracking and Margining
Remote Sensing for Precision Regulation
Typical Operating Frequency: 1MHz
PLL Frequency Synchronization
1.5% Regulation
Current Foldback Protection (Disabled at Start-Up)
Pin Compatible with the LTM4601/LTM4601HV/
LTM4603
Ultrafast Transient Response
Current Mode Control
Up to 93% Ef?ciency at 5V IN , 3.3V OUT
Programmable Soft-Start
Output Overvoltage Protection
Pb-Free (e4) RoHS Compliant Package with Gold
Finish Pads
Small Footprint, Low Pro?le (15mm × 15mm ×
The LTM ? 4603HV 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 28V, the LTM4603HV supports an
output voltage range of 0.6V to 5V as well as output voltage
tracking and margining. The high ef?ciency design deliv-
ers 6A continuous current (8A peak). Only bulk input and
output capacitors are needed to complete the design.
The low pro?le (2.8mm) 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 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 sacri?cing stability. An
2.8mm) Surface Mount LGA Package
APPLICATIO S
onboard remote sense ampli?er can be used to accurately
regulate an output voltage independent of load current.
, LT, LTC, LTM and PolyPhase are registered trademarks of Linear Technology
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Telecom and Networking Equipment
Servers
Industrial Equipment
Point of Load Regulation
Corporation. μ Module is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
2.5V/6A with 4.5V to 28V Input μModule Regulator
Ef?ciency vs Load Current with 24V IN
100
V IN
4.5V TO 28V
CLOCK SYNC
TRACK/SS CONTROL
90
V IN
PGOOD
PLLIN TRACK/SS
V OUT
100pF
V OUT
2.5V
6A
80
ON/OFF
RUN
V FB
MARG0
MARGIN
70
C IN
COMP
INTV CC
LTM4603HV
MARG1
V OUT_LCL
CONTROL
C OUT
60
392k
DRV CC
MPGM
SGND
PGND
DIFFV OUT
V OSNS+
V OSNS–
f SET
19.1k
50
40
24V IN , 1.8V OUT
24V IN , 2.5V OUT
24V IN , 3.3V OUT
24V IN , 5V OUT
5% MARGIN
4603HV TA01a
0
1
2 3 4 5
LOAD CURRENT (A)
6
7
4603HV G03
4603hvf
1
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