SE3806 Datasheet, PDF (1/2 Pages) Seaward Electronics Inc. – 1.25MHz, 600mA Synchronous Step-Down Regulator

1.25MHz, 600mA Synchronous
Step-Down Regulator
(Preliminary)
SE3806
Description
Features
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. 100% duty cycle
provides low dropout operation, extending battery
life in portable systems.
Switching frequency is internally set at
1.25MHz, allowing the use of small surface mount
inductors and capacitors.
¾ High Efficiency: Up to 96%
¾ Very Low Quiescent Current: Only 20μA
During Operation
¾ 600mA Output Current
¾ 2.5V to 5V Input Voltage Range
¾ 1.25MHz Constant Frequency Operation
¾ No Schottky Diode Required
¾ Low Dropout Operation: 100% Duty Cycle
¾ Shutdown Mode draws ≤ 1μA Supply Current
¾ Excellent Line and Load Transient Response
¾ Overtemperature Protection
¾ Available in SOT Package
Application
The internal synchronous switch increases ¾ Cellular Phone
efficiency and eliminates the need for an external ¾ Personal Information Appliances
Schottky diode. The SE3806 is available in low ¾ Wireless and DSL Modems
profile SOT package.
¾ Digital Still Cameras
Pin Configuration
¾ MP3 Players
5 Lead SOT-23
¾ Portable Instruments
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 • Page 1