MP3900 Datasheet, PDF (1/13 Pages) Monolithic Power Systems – High Efficiency Boost Controller

The Future of Analog IC Technology
DESCRIPTION
The MP3900 is a boost controller that drives an
external MOSFET capable of handling 10A
current. It has an operational current of typically
180µA and can accommodate off-line, Telecom
and non-isolated applications. Internal
undervoltage lockout, slope compensation and
peak current limiting are all provided to
minimize the external component count. In a
boost application, with an output voltage of less
than 30V, the current sense pin can connect
directly to the drain of the external switch. This
eliminates the requirement for an additional
current sensing element and its associated
efficiency loss.
While designed for boost applications, the
MP3900 can also be used for other topologies
including Forward, Flyback and Sepic. The 10V
gate driver voltage minimizes the power loss of
the external MOSFET while allowing the use of
a wide variety of standard threshold devices.
The MP3900 is available in 8-pin MSOP and
SOIC packages.
MP3900
High Efficiency
Boost Controller
FEATURES
• Current Mode Control
• 10V MOSFET Gate Driver
• Undervoltage Lockout
• Internal Soft-Start
• Cycle-by-Cycle Current Limiting
• Slope Current Compensation
• Lossless Current Sense (V_ISENSE<30V)
• 10µA Shutdown Current
• 180µA Quiescent Current
• 330KHz Constant Frequency Operation
• Applicable to Boost, SEPIC, Flyback and
Forward Topologies
• Available in an 8-Pin MSOP/SOIC
Packages
APPLICATIONS
• TV CCFL Power Generation
• Telecom Isolated Power
• Brick Modules
• Off-line Controller
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
7
VCC
5
ISENSE
D1
FDS6630A
MP3900
8
GATE
4
SGND
1
PGND
COMP/RUN ^FB
2
3
C3
10nF
V_IN=12V
V_OUT
25V/2A
Efficiency
V_IN =13V, V_OUT =25V
98
97
96
V_OUT=25V
95
94
93
92
91
0
0.5 1.0 1.5 2.0 2.5 3.0
Current (A)
MP3900 Rev. 1.0
www.MonolithicPower.com
1
12/17/2013
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