Order this document by MC34063A/D
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.
SEMICONDUCTOR
TECHNICAL DATA
• 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
P, P1 SUFFIX
PLASTIC PACKAGE
CASE 626
8
1
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
PIN CONNECTIONS
Representative Schematic Diagram
Switch
Collector
Driver
Collector
8
7
6
5
1
2
Switch
Emitter
I
Sense
pk
1
8
7
6
Drive
Collector
Switch
Collector
Timing
Capacitor
V
3
4
CC
Q2
S Q
R
Comparator
Inverting
Input
Q1
Gnd
100
I
pk
Sense
2
3
Switch
Emitter
(Top View)
I
pk
Oscillator
C
T
ORDERING INFORMATION
Operating
Timing
Capacitor
V
CC
Comparator
Temperature Range
Device
Package
1.25 V
Reference
Regulator
+
–
MC33063AD
MC33063AP1
MC33063AVD
MC33063AVP
MC34063AD
SO–8
T
A
= – 40° to +85°C
= –40° to +125°C
5
4
Comparator
Inverting
Input
Plastic DIP
SO–8
Gnd
T
A
(Bottom View)
Plastic DIP
SO–8
This device contains 51 active transistors.
T
A
= 0° to +70°C
MC34063AP1
Plastic DIP
Motorola, Inc. 1996
Rev 5
1
MOTOROLA ANALOG IC DEVICE DATA