MC34063 Datasheet, PDF (1/16 Pages) ON Semiconductor – DC-to-DC Converter Control Circuits

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