MP38870 Datasheet, PDF (1/10 Pages) Monolithic Power Systems – 3A, 14V, 600KHz Step-Down Converter with Synchronizable Gate Driver

The Future of Analog IC Technology
MP38870
3A, 14V, 600KHz Step-Down Converter
with Synchronizable Gate Driver
DESCRIPTION
The MP38870 is a monolithic step-down switch
mode converter with a built in internal high-side
power MOSFET. It achieves 3A 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.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
The MP38870 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 14V Operating Input Range
• 3A Continuous Output Current
• 80mΩ Internal Power MOSFET Switch
• Power Good Indicator
• Synchronous Gate Driver Delivers up to
95% Efficiency
• Fixed 600KHz Frequency
• External Synchronous Option: 250kHz-
1.5MHz
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown
• Output Adjustable from 0.8V
• 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
12
VCC
2
PG
8, 9, 10
SW
13
BG
OFF ON
3
EN/SYNC
GND
14
1
FB
V_OUT
3.3V @ 3A
Efficiency vs.
Output Current
100
V_IN=5V
95
90
V_IN=12V
85
80
75
70
65
V_OUT=3.3V
60
0
1
2
3
4
OUTPUT CURRENT (A)
MP38870 Rev. 1.1
www.MonolithicPower.com
1
10/22/2009
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.