MC34063A
Feb. 2009
MC34063A
1.5 A, Step-Up/Down/Inverting Switching Regulators
DESCRIPTION
The MC34063A Series is a monolithic control circuit containing the primary functions required for DC–to–DC
converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty
cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically
designed to be incorporated in Step–Down and Step–Up and Voltage–Inverting applications with a minimum number
of external components.
FEATURES
Operation from 3.0 V to 40 V Input
Low Standby Current
Current Limiting
Output Switch Current to 1.5 A
Output Voltage Adjustable
Frequency Operation to 100 kHz
Precision 2% Reference
Plug-in replacement of On Semi. MC34063A
APPLICATIONS
Chargers
Adaptors
Mother Board
Scanner
Server for Cellular Phones
DC-DC Converter Module
ORDERING INFORMATION
PART NO.
MC34063AP
MC34063AM
Temp. Range (°C)
0 to 70
0 to 70
Package
8 Pin DIP
8 Pin SOP
PINOUT
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
1
2
3
4
8
7
6
5
Driver
Collector
I
pk
Sense
V
CC
Comparator
Inverting
Input
(Top View)
SCHEMATIC DIAGRAM
Driver
Collector
8
S
R
Q
Q2
Q1
100
2
3
+
1
Switch
Collector
I
pk
Sense
7
I
pk
C
Oscillator
T
Comparator
Switch
Emitter
Timing
Capacitor
V
CC
Comparator
Inverting
Input
:
ADD.: RM. 4004,
6
1.25 V
Reference
4
5
88
BLOCK B,
B
4004
,
:210008
NEW WORLD CENTRE,
NO. 88 ZHUJIANG ROAD,
-
1
Gnd
(TEL.): (86)-25-68853600
NANJING 210008,
CHINA
(FAX): (86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
HN [ NANJING HONANO ELECTRONIC CO., LTD. ]
