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LTM4601 fiches techniques PDF

Linear Technology - step-down switch mode DC/DC power supply

Numéro de référence LTM4601
Description step-down switch mode DC/DC power supply
Fabricant Linear Technology 
Logo Linear Technology 





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LTM4601 fiche technique
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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
µModuleTM 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
VIN
4.5V TO 20V
CIN
CLOCK SYNC
TRACK/SS CONTROL
VIN
PGOOD
PLLIN TRACK/SS
VOUT
ON/OFF
R1
392k
RUN
COMP
INTVCC
DRVCC
MPGM
LTM4601
SGND PGND
VFB
MARG0
MARG1
VOUT_LCL
DIFFVOUT
VOSNS+
VOSNS–
fSET
5% MARGIN
100pF
MARGIN
CONTROL
RSET
40.2k
4601 TA01a
VOUT
1.5V
12A
COUT
Efficiency and Power Loss
vs Load Current
95
EFFICIENCY
90
5VIN
85
12VIN
80
75
12VIN
70
5VIN
65
60
POWER LOSS
55
4.0
3.5
3.0
2.5
2.0
1.5
1.0
50
0
0.5
2 4 6 8 10 12 14
OUTPUT CURRENT (A)
4601 TA01b
4601f
1

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