MC34063A, MC33063A
DC-to-DC Converter
Control Circuits
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. Refer to Application Notes AN920A/D and AN954/D
for additional design information.
http://onsemi.com
8
1
PDIP–8
P, P1 SUFFIX
CASE 626
•
•
•
•
•
•
•
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
8
1
SO–8
D SUFFIX
CASE 751
8
1
SOEIAJ–8
M SUFFIX
CASE 968
PIN CONNECTIONS
Switch
Collector
Switch
Emitter
Driver
Collector
I
pk
Sense
V
CC
Comparator
Inverting
Input
1
2
3
4
(Top View)
8
7
6
5
Representative Schematic Diagram
Drive 8
Collector
S Q
I
pk
Sense
7
R
100
Q2
Q1
2
Switch
Emitter
1
Switch
Collector
Timing
Capacitor
Gnd
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
I
pk
Oscillator C
T
V
CC
6
Comparator
+
-
Comparator 5
Inverting
Input
1.25 V
Reference
Regulator
4
(Bottom View)
3
Timing
Capacitor
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 11 of this data sheet.
Gnd
This device contains 51 active transistors.
©
Semiconductor Components Industries, LLC, 2000
1
August, 2000 – Rev. 6
Publication Order Number:
MC34063A/D