LTM4601AHV
12A, 28V DC/DC µModule
IN
with PLL, Output Tracking
and Margining
DESCRIPTION
FEATURES
The LTM®4601AHV is a complete 12A step-down switch
mode DC/DC power supply with onboard switching
controller, MOSFETs, inductor and all support compo-
nents. The μModule is housed in a small surface mount
15mm×15mm×2.8mmLGApackage. TheLTM4601AHV
LGA package is designed with redundant mounting pads
to enhance solder-joint strength for extended temperature
cycling endurance. Operating over an input voltage range
of 4.5 to 28V, the LTM4601AHV supports an output volt-
age range of 0.6V to 5V as well as output voltage tracking
and margining. The high efficiency design delivers 12A
continuouscurrent(14Apeak). Onlybulkinputandoutput
capacitors are needed to complete the design.
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Complete Switch Mode Power Supply
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Wide Input Voltage Range: 4.5V to 28V
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12A DC Typical, 14A Peak Output Current
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0.6V to 5V Output Voltage
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Output Voltage Tracking and Margining
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Redundant Mounting Pads for Enhanced Solder-
Joint Strength
Parallel Multiple μModulesTM for Current Sharing
n
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Differential Remote Sensing for Precision Regulation
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PLL Frequency Synchronization
1.5% Total DC Error
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Current Foldback Protection (Disabled at Start-Up)
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Pb-Free (e4) RoHS Compliant Package with Gold
Finish Pads
The low profile (2.8mm) and light weight (1.7g) pack-
age easily mounts in 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.
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–55°C to 125°C Operating Temperature Range
(LTM4601AHVMPV)
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Ultrafast™ Transient Response
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Up to 95% Efficiency at 5V , 3.3V
IN
OUT
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n
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Programmable Soft-Start
Output Overvoltage Protection
An onboard differential remote sense amplifier can be
used to accurately regulate an output voltage independent
of load current.
Enhanced (15mm × 15mm × 2.8mm) Surface Mount
LGA Package
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. PolyPhase is
a registered trademark of Linear Technology Corporation. μModule and Ultrafast are trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589,
6774611, 6677210.
APPLICATIONS
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Telecom, Industrial and Networking Equipment
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Military and Avionics Systems
TYPICAL APPLICATION
Efficiency and Power Loss
vs Load Current
2.5V/12A Power Supply with 4.5V to 28V Input
95
90
85
80
75
70
65
60
55
50
45
6
5
4
3
2
1
0
12V
IN
CLOCK SYNC
TRACK/SS CONTROL
EFFICIENCY
V
IN
4.5V TO 28V
V
PLLIN TRACK/SS
V
24V
IN
V
2.5V
12A
IN
OUT
PGOOD
OUT
100pF
POWER LOSS
V
FB
ON/OFF
RUN
COMP
INTV
CC
MARG0
MARG1
V
OUT_LCL
MARGIN
CONTROL
24V
IN
C
LTM4601AHV
OUT
C
IN
12V
IN
DRV
CC
DIFFV
OUT
+
MPGM
SGND PGND
V
V
OSNS
–
OSNS
R1
392k
f
SET
R
SET
19.1k
0
4
6
8
10
12
14
2
5% MARGIN
4601AHV TA01a
LOAD CURRENT (A)
4601AHV TA01b
4601ahvf
1