LTM4601 Datasheet, PDF (1/28 Pages) Linear Technology – 12A DC/DC μModules with PLL, Output Tracking and Margining

FEATURES
■ _{Complete Switch Mode Power Supply}
■ _{Wide Input Voltage Range: 4.5V to 20V}
■ _{12A DC Typical, 14A Peak Output Current}
■ _{0.6V to 5V Output Voltage}
■ _{Output Voltage Tracking and Margining}
■ _{Parallel Multiple µModules for Current Sharing}
■ _{Differential Remote Sensing for Precision}
Regulation (LTM4601 Only)
■ _{PLL Frequency Synchronization}
■ _{±1.5% Regulation}
■ _{Current Foldback Protection (Disabled at Start-Up)}
■ _{Pb-Free (e4) RoHS Compliant Package with Gold}
Finish Pads
■ _{Ultrafast Transient Response}
■ _{Current Mode Control}
■ _{Up to 95% Efficiency at 5VIN, 3.3VOUT}
■ _{Programmable Soft-Start}
■ _{Output Overvoltage Protection}
■ _{Small Footprint, Low Profile (15mm × 15mm ×}
2.8mm) Surface Mount LGA Package
U
APPLICATIO S
■ _{Telecom and Networking Equipment}
■ _Servers
■ _{Industrial Equipment}
■ _{Point of Load Regulation}
LTM4601/LTM4601-1
12A DC/DC µModules
with PLL, Output Tracking
and Margining
DESCRIPTIO
The LTM^®4601 is a complete 12A 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 LTM4601 supports an
output voltage range of 0.6V to 5V as well as output voltage
tracking and margining. The high efficiency design delivers
12A continuous current (14A peak). Only bulk input and
output capacitors are needed to complete the design.
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.
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 differential 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 LTM4601-1.
, LTC, LT 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.
Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589,
6774611, 6677210
TYPICAL APPLICATIO
1.5V/12A Power Supply with 4.5V to 20V Input
V_IN
4.5V TO 20V
C_IN
CLOCK SYNC
TRACK/SS CONTROL
V_IN
PGOOD
PLLIN TRACK/SS
V_OUT
ON/OFF
R1
392k
RUN
COMP
INTV_CC
DRV_CC
MPGM
LTM4601
SGND PGND
V_FB
MARG0
MARG1
V_{OUT_LCL}
DIFFV_OUT
V_OSNS+
V_OSNS–
f_SET
5% MARGIN
100pF
MARGIN
CONTROL
R_SET
40.2k
4601 TA01a
V_OUT
1.5V
12A
C_OUT
Efficiency and Power Loss
vs Load Current
95
4.0
EFFICIENCY 5V_IN
90
3.5
85
12V_IN
3.0
80
75
2.5
12V_IN
70
2.0
5V_IN
65
1.5
60
55
POWER LOSS
1.0
50
0
0.5
2 4 6 8 10 12 14
OUTPUT CURRENT (A)
4601 TA01b
4601f
1