LTM4628
Dual 8A or Single 16A
DC/DC µModule Regulator
FeaTures
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DescripTion
The LTM
®
4628 is a complete dual 8A output switching
mode DC/DC power supply and can be easily configured
to provide a single 2-phase 16A output. Included in the
package are the switching controller, power FETs, inductor,
and all supporting components. Operating from an input
voltage range of 4.5V to 26.5V, the LTM4628 supports
two outputs each with an output voltage range of 0.6V to
5.5V, set by a single external resistor. Its high efficiency
design delivers 8A continuous current for each output.
Only a few input and output capacitors are needed.
The device supports frequency synchronization, multi-
phase operation, Burst Mode operation and output voltage
tracking for supply rail sequencing. It has an onboard
temperature diode for device temperature monitoring.
High switching frequency and a current mode architec-
ture enable a very fast transient response to line and load
changes without sacrificing stability.
Fault protection features include overvoltage and over-
current protection. The power module is offered in space
saving and thermally enhanced 15mm × 15mm × 4.32mm
LGA and 15mm × 15mm × 4.92mm BGA packages. The
LTM4628 is RoHS compliant with Pb-free finish.
L,
LT, LTC, LTM, Linear Technology, the Linear logo, µModule, Burst Mode and PolyPhase
are registered and LTpowerCAD is a trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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Complete Standalone Dual Power Supply
Single 16A or Dual 8A Output
Wide Input Voltage Range: 4.5V to 26.5V
Output Voltage Range: 0.6V to 5.5V
±1.5% Total DC Output Error
Differential Remote Sense Amplifier
Current Mode Control/Fast Transient Response
Adjustable Switching Frequency
Overcurrent Foldback Protection
Multiphase Parallel Current Sharing with
Multiple LTM4628s
Frequency Synchronization
Internal Temperature Sensing Diode Output
Selectable Burst Mode
®
Operation
Soft-Start/Voltage Tracking
Output Overvoltage Protection
Small Surface Mount Footprint, Low Profile
15mm × 15mm × 4.32mm LGA and
15mm × 15mm × 4.92mm BGA Packages
applicaTions
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Telecom and Networking Equipment
Storage and ATCA Cards
Industrial Equipment
Typical applicaTion
Dual 8A, 1.5V and 1.2V Output DC/DC µModule
®
Regulator
4.7µF
95
V
IN
4.5V TO
26.5V
MODE_PLLIN CLKOUT INTV
CC
*
10µF
35V
×4
V
IN
120k
TEMP
RUN1
RUN2
*
TRACK1
5.1V ZENER
0.1µF
TRACK2
f
SET
PHASMD
100k
LTM4628
EXTV
CC
PGOOD1
V
OUT1
V
OUTS1
DIFFOUT
SW1
V
FB1
V
FB2
COMP1
COMP2
V
OUTS2
V
OUT2
SW2
PGOOD2
* PULL-UP RESISTOR AND
ZENER ARE OPTIONAL.
SGND
GND
DIFFP
DIFFN
100µF
6.3V
60.4k
40.2k
100µF
6.3V
V
OUT1
1.5V AT 8A
EFFICIENCY (%)
470µF
6.3V
90
85
80
75
70
65
60
55
V
OUT2
1.2V AT 8A
470µF
6.3V
50
0
1
2
3
5
6
4
LOAD CURRENT (A)
7
8
POWER LOSS
Efficiency and Power Loss
at 12V Input
1.2V
1.5V
2.0
EFFICIENCY
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
POWER LOSS (W)
10k
4628 TA01b
4628 TA01a
4628fd
1
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
