MP6903
Fast Turn-off Intelligent Controller
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP6903 is a low-drop diode emulator that,
combined with an external switch, replaces
Schottky diodes in high-efficiency LLC
converters. The chip regulates the forward drop
of an external switch to about 70mV and
switches it off as soon as the voltage goes
negative. MP6903 has a light-load sleep mode
that reduces the quiescent current to < 300µA.
Works with Standard and Logic-Level FETS
Compatible with Energy Star, 1W Standby
Requirements
VDD Range from 8V to 24V
Fast Turn-Off: Total Delay of 20ns
Max 400kHz Switching Frequency
<300µA Quiescent Current in Light Load
Mode
Supports DCM, CCM and CrCM Operation
Supports High-Side and Low-Side
Rectification
Power Savings of Up to 1.5W for a Typical
Notebook Adapter
APPLICATIONS
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
LLC Converters
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
U1
MP6903
Output
R2
8
7
1
R3
10k
PGND
EN
VG
NC
VDD
VSS
120k
VG1
2
3
4
EN
1nF
C2
R1
Or Left
Open
6
5
LL
C1
100k
VD
Qa
2.2uF
R5
1k
VG1
Cs
Ls
C
in
Q1
Q
b
Lm
Output
GND
C4
VG2
R6
1k
Q2
MP6903
VG2
1
2
3
8
7
6
VG
PGND
EN
LL
VD
NC
VDD
VSS
C3
1nF
R4 100k
4
5
U2
MP6903 Rev. 1.04
1/31/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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