MP38875 Datasheet, PDF (1/14 Pages) Monolithic Power Systems – 15A, 16V, 800kHz Step-Down Converter with Synchronous Gate Driver

The Future of Analog IC Technology
MP38875
15A, 16V, 800kHz Step-Down
Converter with Synchronous Gate Driver
DESCRIPTION
The MP38875 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 15A continuous output
current over a wide input supply range with
excellent load and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
The MP38875 requires a minimum number of
readily available standard external components
and is available in a 20-pin 3mm x 4mm QFN
package.
The MP38875 is ideal for a wide range of
applications including distributed power systems,
pre-regulator for linear regulators, compact DC-
DC regulators for PCB space limited platforms.
TYPICAL APPLICATION
VCC
V_IN
C1
22uF
25V
R3
C6 C3
OFF ON
IN
PG BST
SW
COMP
VCC
BG
SS/TRK ^MP38875
FB
EN
SYNCIN
SYNCOUT GND
CB
L1
1uF _0.72uH
FEATURES
• Wide 4.5V to 16V Operating Input Range
• 15A Output Current
• 25mΩ Internal Power MOSFET Switch
• Synchronous Gate Driver
• Synch from 300KHz to > 1MHz External Clock or
800KHz Fixed Switching Frequency
• Synch Output to Drive Another Regulator in
Phase-Shift Operation
• Feedback Voltage Accuracy: 2%
• Programmable Soft-Start
• Startup Tracking
• EN and Power Good for Power Sequencing
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown
• Output Adjustable from 0.8V to 12V
• Stable with Low ESR Output Ceramic
Capacitors
• Available in a 3mm x 4mm QFN Package
APPLICATIONS
• Distributed Power Systems
• Pre-Regulator for Linear Regulators
• Compact DC-DC Regulator for PCB Space
Limited Platforms
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
System
V_OUT
1.8V/15A
C2
100uF
6.3V
Efficiency vs. Output Current
V_IN=12V,V_O=1.8V
100
90
80
70
60
50
40
30
20
0 2 4 6 8 10 12 14 16
I_OUT (A)
MP38875 Rev. 0.9
www.MonolithicPower.com
1
11/20/2009
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