LTM4628_15 Datasheet, PDF (1/36 Pages) Linear Technology – Dual 8A or Single 16A DC/DC Module Regulator

FEATURES
n _{Complete Standalone Dual Power Supply}
n _{Single 16A or Dual 8A Output}
n _{Wide Input Voltage Range: 4.5V to 26.5V}
n _{Output Voltage Range: 0.6V to 5.5V}
n _{±1.5% Total DC Output Error}
n _{Differential Remote Sense Amplifier}
n _{Current Mode Control/Fast Transient Response}
n _{Adjustable Switching Frequency}
n _{Overcurrent Foldback Protection}
n _{Multiphase Parallel Current Sharing with}
Multiple LTM4628s
n _{Frequency Synchronization}
n _{Internal Temperature Sensing Diode Output}
n _{Selectable Burst Mode}^® _Operation
n _{Soft-Start/Voltage Tracking}
n _{Output Overvoltage Protection}
n _{Small Surface Mount Footprint, Low Profile}
15mm × 15mm × 4.32mm LGA and
15mm × 15mm × 4.92mm BGA Packages
APPLICATIONS
n _{Telecom and Networking Equipment}
n _{Storage and ATCA Cards}
n _{Industrial Equipment}
LTM4628
Dual 8A or Single 16A
DC/DC µModule Regulator
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 available with SnPb (BGA) or RoHS compli-
ant terminal 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.
TYPICAL APPLICATION
Dual 8A, 1.5V and 1.2V Output DC/DC µModule^® Regulator
4.7µF
V_IN
4.5V TO
26.5V _*
10k
10µF
35V
120k
×4
*
5.1V ZENER
0.1µF
100k
* PULL-UP RESISTOR AND
ZENER ARE OPTIONAL.
MODE_PLLIN CLKOUT INTV_CC
V_IN
TEMP
RUN1
RUN2
TRACK1
TRACK2
LTM4628
f_SET
PHASMD
SGND GND
DIFFP
EXTV_CC PGOOD1
V_OUT1
V_OUTS1
DIFFOUT
SW1
V_FB1
V_FB2
COMP1
COMP2
V_OUTS2
V_OUT2
SW2
PGOOD2
DIFFN
100µF
6.3V
V_OUT1
1.5V AT 8A
470µF
6.3V
60.4k
40.2k
100µF
6.3V
470µF
6.3V
V_OUT2
1.2V AT 8A
4628 TA01a
For more information www.linear.com/LTM4628
Efficiency and Power Loss
at 12V Input
95
1.2V
90
1.5V
85
80
75
70
65
60
55
2.0
EFFICIENCY
1.8
1.6
1.4
1.2
1.0
POWER LOSS
0.8
0.6
0.4
0.2
50
0
012345678
LOAD CURRENT (A)
4628 TA01b
4628fe
1