1

2

3

4

8

7

6

5

Switch Collector

Switch Emitter

Timing Capacitor

GND

Driver Collector

Comparator Inverting Input

D (SOIC) OR P (PDIP) PACKAGE

(TOP VIEW)

DRJ (QFN) PACKAGE

(TOP VIEW)

Comparator Inverting Input

Switch Collector

2

3

4

1

8

7

6

5

Switch Emitter

Timing Capacitor

GND

Driver Collector

†

MC33063A

MC34063A

www.ti.com

SLLS636L – DECEMBER 2004 – REVISED DECEMBER 2009

1.5-A PEAK BOOST/BUCK/INVERTING SWITCHING REGULATORS

Check for Samples: MC33063A MC34063A

1

FEATURES

•

Wide Input Voltage Range: 3 V to 40 V

•

Precision Internal Reference: 2%

•

High Output Switch Current: Up to 1.5 A

•

Short-Circuit Current Limiting

•

Adjustable Output Voltage

•

Low Standby Current

•

Oscillator Frequency Up to 100 kHz

DESCRIPTION/ORDERING INFORMATION

The MC33063A and MC34063A are easy-to-use ICs containing all the primary circuitry needed for building

simple dc-dc converters. These devices primarily consist of an internal temperature-compensated reference, a

comparator, an oscillator, a PWM controller with active current limiting, a driver, and a high-current output switch.

Thus, the devices require minimal external components to build converters in the boost, buck, and inverting

topologies.

The MC33063A is characterized for operation from –40°C to 85°C, while the MC34063A is characterized for

operation from 0°C to 70°C.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2004–2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.