SEAWARD SE3806

1.25MHz, 600mA Synchronous
Step-Down Regulator
(Preliminary)
Description
SE3806
Features
The SE3806 is a high efficiency monolithic
¾
High Efficiency: Up to 96%
synchronous buck regulator using a constant
¾
Very Low Quiescent Current: Only 20μA
frequency, voltage mode architecture. The device
During Operation
is available in fixed output voltage of 1.8V and 1.5V
¾
600mA Output Current
and adjustable output voltage.
Supply current
¾
2.5V to 5V Input Voltage Range
during operation is only 20μA and drop to ≤1μA in
¾
1.25MHz Constant Frequency Operation
shutdown. The 2.5V to 5.5V input voltage range
¾
No Schottky Diode Required
makes the SE3806 ideally suited for single Li-Ion
¾
Low Dropout Operation: 100% Duty Cycle
battery-powered applications.
100% duty cycle
¾
Shutdown Mode draws ≤ 1μA Supply Current
provides low dropout operation, extending battery
¾
Excellent Line and Load Transient Response
life in portable systems.
¾
Overtemperature Protection
¾
Available in SOT Package
Switching frequency is internally set at
1.25MHz, allowing the use of small surface mount
inductors and capacitors.
Application
The internal synchronous switch increases
¾
Cellular Phone
efficiency and eliminates the need for an external
¾
Personal Information Appliances
Schottky diode.
¾
Wireless and DSL Modems
profile SOT package.
¾
Digital Still Cameras
Pin Configuration
¾
MP3 Players
¾
Portable Instruments
The SE3806 is available in low
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 • Page 1
1.25MHz, 600mA Synchronous
Step-Down Regulator
(Preliminary)
SE3806
OUTLINE DRAWING SOT-23-5L
DIMENSIONS
INCHES
MM
MIN MAX MIN MAX
K
B
H
D
A
F
E
C
J
DIMN
A
B
C
D
E
F
H
J
K
0.110
0.059
0.036
0.014
0.0035
0.102
0.120
0.070
0.051
0.020
0.037
0.075
0.006
0.008
0.118
Customer Support
Seaward Electronics Incorporated – China
Section B, 2nd Floor, ShangDi Scientific Office Complex, #22 XinXi Road
Haidian District, Beijing 100085, China
Tel: 86-10-8289-5700/01/05
Fax: 86-10-8289-5706
Seaward Electronics Corporation – Taiwan
2F, #181, Sec. 3, Minquan East Rd,
Taipei, Taiwan R.O.C
Tel: 886-2-2712-0307
Fax: 886-2-2712-0191
Seaward Electronics Incorporated – North America
1512 Centre Pointe Dr.
Milpitas, CA95035, USA
Tel: 1-408-821-6600
Last Updated - 12/4/2008
Revision
12/4/2008
Preliminary and all contents are subject to change without prior notice
© Seaward Electronics, Inc., 2004. • www.seawardinc.com.cn • Page 2
2.80
1.50
0.90
0.35
0.090
2.60
3.05
1.75
1.30
0.50
0.95
1.90
0.15
0.20
3.00