Order this document by MC34063A/D
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.
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Operation from 3.0 V to 40 V Input
DC–to–DC CONVERTER
CONTROL CIRCUITS
SEMICONDUCTOR
TECHNICAL DATA
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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
1
S Q
Ipk 7
Sense
R
100
Ipk
Oscillator CT
6
VCC
Comparator
+
–
Comparator 5
Inverting
Input
(Bottom View)
1.25 V
Reference
Regulator
4
Gnd
MC33063AVD
MC33063AVP
MC34063AD
This device contains 51 active transistors.
MC34063AP1
TA = 0° to +70°C
TA = –40° to +125°C
SO–8
Plastic DIP
SO–8
Plastic DIP
Rev 5
Switch
Collector
Switch
Emitter
Timing
Capacitor
Gnd
1
2
3
4
8
7
6
5
Driver
Collector
Ipk Sense
VCC
Comparator
Inverting
Input
Drive 8
Collector
Q2
Q1
Switch
Collector
2
Switch
Emitter
(Top View)
3
ORDERING INFORMATION
Timing
Capacitor
Device
MC33063AD
MC33063AP1
Operating
Temperature Range
TA = – 40° to +85°C
Package
SO–8
Plastic DIP
©
Motorola, Inc. 1996
MOTOROLA ANALOG IC DEVICE DATA
1