1.25MHz, 600mA Synchronous
Step-Down Regulator
(Preliminary)
Description
The SE3806 is a high efficiency monolithic
synchronous buck regulator using a constant
frequency, voltage mode architecture. The device
is available in fixed output voltage of 1.8V and 1.5V
and adjustable output voltage.
Supply current
during operation is only 20μA and drop to
≤1μA
in
shutdown. The 2.5V to 5.5V input voltage range
makes the SE3806 ideally suited for single Li-Ion
battery-powered applications.
life in portable systems.
Switching frequency is internally set at
1.25MHz, allowing the use of small surface mount
inductors and capacitors.
The internal synchronous switch increases
efficiency and eliminates the need for an external
Schottky diode.
The SE3806 is available in low
profile SOT package.
100% duty cycle
provides low dropout operation, extending battery
SE3806
Features
High Efficiency: Up to 96%
Very Low Quiescent Current: Only 20μA
During Operation
600mA Output Current
2.5V to 5V Input Voltage Range
1.25MHz Constant Frequency Operation
No Schottky Diode Required
Low Dropout Operation: 100% Duty Cycle
Shutdown Mode draws
≤
1μA Supply Current
Excellent Line and Load Transient Response
Overtemperature Protection
Available in SOT Package
Application
Cellular Phone
Personal Information Appliances
Wireless and DSL Modems
Digital Still Cameras
MP3 Players
Portable Instruments
Pin Configuration
5 Lead SOT-23
Application Diagram
Revision
12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics, Inc., 2004. •
www.seawardinc.com.cn
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