MC33063AVP

Plastic DIP

Order this document by MC34063A/D

MC34063A

MC33063A

DC–to–DC CONVERTER

CONTROL CIRCUITS

D SUFFIX

PLASTIC PACKAGE

CASE 751

(SO–8)

P, P1 SUFFIX

PLASTIC PACKAGE

CASE 626

PIN CONNECTIONS

SEMICONDUCTOR

TECHNICAL DATA

8

1

1

8

1

Switch

Collector

Switch

Emitter

Timing

Capacitor

Gnd

Driver

Collector

Ipk Sense

VCC

Comparator

Inverting

Input

(Top View)

Device

Operating

Temperature Range

Package

ORDERING INFORMATION

MC33063AD

MC33063AP1

TA = – 40° to +85°C

SO–8

Plastic DIP

MC33063AVD

TA = –40° to +125°C

SO–8

2

3

45

6

7

8

MC34063AD

SO–8

MC34063AP1

TA = 0° to +70°C

Plastic DIP

1

MOTOROLA ANALOG IC DEVICE DATA

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.

Representative Schematic Diagram

SQ

R

Q2

Q1

100

Ipk

Oscillator CT

Comparator

+

–

1.25 V

Reference

Regulator

1

2

3

4

5

6

7

8

Drive

Collector

Ipk

Sense

VCC

Comparator

Inverting

Input

Switch

Collector

Switch

Emitter

Timing

Capacitor

Gnd

(Bottom View)

This device contains 51 active transistors.

© Motorola, Inc. 1996

Rev 5