MP28257 Datasheet, PDF (1/16 Pages) Monolithic Power Systems – 4A, Fast Transient, 4.2V-to-20V Input Synchronous Step-Down Converter 2mmx3mm QFN12

The Future of Analog IC Technology
DESCRIPTION
The MP28257 is a fully-integrated,
synchronous, step-down, switch-mode
converter with a programmable frequency. It
offers a very compact solution that can provide
up to 4A of continuous output current over a
wide input supply range with excellent load and
line regulation, and can operate at high
efficiency over a wide output current load
range.
Constant-on-time control mode provides fast
transient response and eases loop stabilization.
Protections include short-circuit protection,
over-current protection, over-voltage protection,
under-voltage protection, and thermal shut
down.
The MP28257 requires a minimal number of
readily-available standard external components.
The device is available in a space saving
2mmx3mm QFN12 package that complies with
ROHS.
MP28257
4A, Fast Transient, 4.2V-to-20V Input
Synchronous Step-Down Converter
2mmx3mm QFN12
FEATURES
 Wide 4.2V-to-20V Operating Input Range
 4A Continuous Output Current
 Internal 120mΩ High-Side, 50mΩ Low-
Side Power MOSFETs
 Stable with Ceramic Output Capacitors
 Proprietary Switching Loss-Reduction
Technology
 Power-Good Indicator
 Soft Startup/Shutdown
 Programmable Switching Frequency
 SCP, OCP, OVP, UVP Protection and
Thermal Shutdown
 Output Adjustable from 0.815V to 13V
 Available in a 2mmx3mm QFN12
Package
APPLICATIONS
 Networking Systems
 Distributed Power Systems
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TYPICAL APPLICATION
MP28257 Rev 1.0
www.MonolithicPower.com
1
11/8/2011
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