MP38872 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 6A, 21V, 600kHz Step-Down Converter with Synchronizable Gate Driver

The Future of Analog IC Technology
MP38872
6A, 21V, 600kHz Step-Down Converter
with Synchronizable Gate Driver
DESCRIPTION
The MP38872 is a monolithic step-down switch
mode converter with a built in high-side internal
power MOSFET and a gate driver for a low-side
external MOSFET. It achieves 6A continuous
output current over a wide input supply range
with excellent load and line regulation.
Current mode operation provides fast transient
response and reliable over-current protection.
The MP38872 requires a minimum number of
readily available standard external components
and is available in a 14-pin QFN 3x4 package
with exposed pad.
FEATURES
• Wide 4.5V to 21V Operating Input Range
• 6A Output Current
• 45mΩ Internal Power MOSFET Switch
• Power Good Indicator
• Synchronizable Gate Driver Delivers up to
95% Efficiency
• Fixed 600kHz Frequency
• Synchronizable to >1MHz External Clock
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown
• Output Adjustable from 0.8V
• Stable with Low ESR Output Ceramic
Capacitors
• Available in a Thermally Enhanced 14-Pin
QFN 3x4 Package
APPLICATIONS
• Point of Load Regulator in Distributed
Power System
• Digital Set Top Boxes
• Personal Video Recorders
• Broadband Communications
• Flat Panel Television and Monitors
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“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
V_IN
C1
22uF
25V
C3
1uF
16V
Power Good
OFF ON
4, 5, 6
IN
11
BST
12
R3
100kΩ
SW
VCC
MP38872 _BG
8, 9, 10
13
2
PG
3
EN/SYNC
GND
14
1
FB
C4
1uF L1
16V 2.2uH
M2
R1
40.2kΩ
R2
13kΩ
V_OUT
3.3V
C2
100uF
6.3V
Efficiency vs
Output Current
100
95
90
85
80
V_IN=12V
75
V_IN=20V
70
65
60
55
V_OUT=3.3V
50
0123456
OUTPUT CURRENT (A)
MP38872 Rev.1.11
www.MonolithicPower.com
1
9/21/2011
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