MP38894 Datasheet, PDF (1/10 Pages) Monolithic Power Systems – 4.5A, 42V, 420kHz Step-Down Converter with Synchronizable Gate Driver

The Future of Analog IC Technology
MP38894
4.5A, 42V, 420kHz Step-Down Converter
with Synchronizable Gate Driver
DESCRIPTION
The MP38894 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 4.5A 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 MP38894 requires a minimum number of
readily available standard external components
and is available in an 8-pin SOIC package with
exposed pad.
FEATURES
• Wide 4.5V to 42V Operating Input Range
• 4.5A Continuous Output Current
• ±1.5% Vfb Accuracy
• 100mΩ Internal Power MOSFET Switch
• Synchronizable Gate Driver Delivers up to
95% Efficiency
• Fixed 420kHz Frequency
• Synchronizable up to 1.5MHz
• Cycle-by-Cycle Over Current Protection with
Hiccup retry
• Thermal Shutdown
• Output Adjustable from 0.8V to 15V
• Stable with Low ESR Output Ceramic
Capacitors
• Available in a Thermally Enhanced 8-Pin
SOIC Package
APPLICATIONS
• 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
V_IN
OFF ON
8
IN
2
BST
3
VCC
1
SW
M2
4
BG
7
EN/SYNC
GND
5
6
FB
MP38894 Rev.1.0
www.MonolithicPower.com
1
9/28/2009
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