EV3908DK-00B
High Efficiency Synchronous
Boost Converter EV Board
EV3908DK-00B Rev. 1.0 www.MonolithicPower.com 1
5/20/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The EV3908DK-00B is a synchronous boost
converter evaluation board for the MP3908DK.
It is configured to provide a regulated 19V
output at up to 5A load current from a 7V-17V
input. The output is adjustable by changing
feedback resistors on the evaluation board.
The demo board uses the external 6.7mΩ
resistor to sense the current and MP6901DS to
drive a low Ron mosfet as rectifier to achieve
high efficiency. MP6901DS is a Low-Drop
Diode Emulator IC which works with an external
switch to replace Schottky diode.
ELECTRICAL SPECIFICATIONS
Parameter Symbol Value Units
Input voltage V
IN
7–17 V
Input current I
IN
0–14.5 A
Output voltage V
O
19 V
Output Current I
O
5 A
FEATURES
• High Efficiency
• Synchronous Rectification with MP6901DS
• Current Mode Control
• Soft-Start
• Under-Voltage Lockout
• 250KHz Constant Frequency Operation
APPLICATIONS
• Backup Battery Charger for Notebook
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
EV3908DK-00B EVALUATION BOARD
(L x W x H) 4.3” x 3.1” x 0.6”
11cm x 8cm x 1.4cm
Board Number MPS IC Number
EV3908DK-00B MP3908DK
Efficiency vs.
Load Current
0123456
OUTPUT CURRENT (A)
EFFICIENCY (%)
V
IN
=7V
V
IN
=12V
V
IN
=17V
80
82
84
86
88
90
92
94
96
98
100
