MP38874 Datasheet, PDF (1/11 Pages) Monolithic Power Systems – 8A, 21V, 600KHz Step-Down Converter with Synchronizable Gate Driver

The Future of Analog IC Technology
MP38874
8A, 21V, 600KHz Step-Down Converter
with Synchronizable Gate Driver
DESCRIPTION
The MP38874 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 8A 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 MP38874 requires a minimum number of
readily available standard external components
and is available in a space saving 3mm x 4mm
14-pin QFN package.
FEATURES
• Wide 4.5V to 21V Operating Input Range
• 8A Continuous Output Current
• 42mΩ Internal Power MOSFET Switch
• Power Good Indicator
• Synchronous 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 to 15V
• Stable with Low ESR Output Ceramic
Capacitors
• Available in a 3mm x 4mm 14-Pin QFN
Package
APPLICATIONS
• Point of Load Regulator in Distributed
Power System
• Digital Set Top Boxes
• Personal Video Recorders
• Broadband Communications
• Flat Panel Television and Monitors
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
4, 5, 6
V_IN
IN
11
BST
POWER
GOOD
12
VCC
8, 9, 10
SW
MP38874
2
PG
13
BG
OFF ON
V_CC
3
EN/SYNC
GND
14
1
FB
Efficiency vs
Output Current
100
V_IN=12V
90
V_IN=20V
80
V_OUT=3.3V
70
1 2 34 5 6 7 8
OUTPUT CURRENT (A)
MP38874 Rev. 1.1
www.MonolithicPower.com
1
10/13/2010
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