SEAWARD
ELECTRONICS
INC.
DC-to-DC Converter
Control Circuit
S E3 4 0 6 3
DESCRIPTION
The SE34063 is a monolithic control circuit
containing the primary functions required for
DC-to-DC converter. The device consists of an
internal temperature compensated reference,
comparator, controlled duty cycle oscillator with an
active current limit circuit, driver and high current
output switch. This was specifically designed to be
incorporated in Step-up, and Step-down and
Voltage-Inverting applications with a minimum
number of external components.
FEATURES
Operation from 3.0V to 35V input
Dip-8 Packages
Low Standby Current
Output Switch Current to 1.5A
Output Voltage Adjustable
Frequency Operation to 100KHz
Precision 2% Reference
APPLICATION
Battery charges
Power supply adapter
DC-to-DC converter, such as 12 to 5V.
PIN CONFIGURATIONS
BLOCK DIAGRAM
DIP-8 (Top View)
SC
SE
TC
GND
1
2
3
4
DIP-8
8
7
6
5
DRIC
Ipk
Vcc
Drive 8
Collector
Ipk 7
Sense
6
CT
Oscillator
Comparator
Ipk
S Q
R
1 Switch
Collector
2 Switch
Emitter
3 Timing
Capacitor
Vcc
CII
+
-
Comparator 5
Inverting Input
1.25V
Reference
Regulator
4
Gnd
SOP-8
SC
SE
TC
GND
1
2
3
4
SOP-8
8
7
6
5
DRIC
Ipk
Vcc
CII
Preliminary and all contents are subject to change without prior notice.
©2001SEAWARD ELECTRONICS INC.
Tel: 0086-(010)82895705, 82895706
Room1605, Building1, International Pioneering Park, No.1 Shangdi XinXi Road, Haidian District, Beijing 100085, China
http://
www.seawardinc.com.cn
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SEAWARD [ Seaward Electronics Inc. ]
