MP28259 Datasheet, PDF (1/18 Pages) Monolithic Power Systems – High Efficiency, Fast Transient, 2A, 4.2V-20V Input Synchronous Step-down Converter in QFN12

The Future of Analog IC Technology
MP28259
High Efficiency, Fast Transient, 2A,
4.2V-20V Input Synchronous
Step-down Converter in QFN12 (2x3mm)
DESCRIPTION
The MP28259 is a fully-integrated synchronous,
rectified, step-down switch mode converter with
programmable frequency. It offers a very
compact solution that can achieve a 2A
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 (COT) control mode
provides fast transient response and eases loop
stabilization.
Full protection features include SCP, OCP, OVP,
UVP, and thermal shut down.
The MP28259 requires a minimal number of
readily-available standard external components.
The device is available in a space saving
2mmx3mm 12-pin QFN package.
FEATURES
• Wide 4.2V to 20V Operating Input Range
• 2A Output Current
• Low R_DS(ON) Internal Power MOSFETs
• Proprietary Switching Loss Reduction
Technique
• Power-Good Indicator in QFN Package
• Soft Shutdown
• Programmable Switching Frequency
• OCP, SCP, OVP, UVP Protection and
Thermal Shutdown
• Optional OCP Protection: Latch-Off Mode
and Hiccup Mode
• Output Adjustable from 0.815V to 13V
• Available in a QFN12 (2mmx3mm) Package
APPLICATIONS
• Networking Systems
• Distributed Power Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
4.2V - 20V _R7
C1
C5
9 _IN
3
BST
C3
MP28259
8 _FREQ
2, 10
SW
4 _VCC
OFF ON EN
5
EN
6
PG
FB ⁷
GND
1, 11, 12
L1
R4
C4
R1
220pF
VOUT
1.2V
C2
R2
MP28259 Rev. 1.34
www.MonolithicPower.com
1
4/27/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.