−

+

Q

S

1.25-V

Reference

Regulator

R

Oscillator

Q2

Q1

Switch

Collector

4

Switch

Emitter

Timing

Capacitor

GND

3

2

1

8

7

6

5

Comparator

Inverting Input

Sense

Drive

Collector

100

Ω

MC33063A

MC34063A

SLLS636L – DECEMBER 2004 – REVISED DECEMBER 2009

www.ti.com

ORDERABLE PART NUMBER

TOP-SIDE MARKING

PDIP – P

Tube of 50

MC33063AP

MC33063AP

QFN – DRJ

Reel of 1000

MC33063ADRJR

ZYF

–40°C to 85°C

Tube of 75

MC33063AD

SOIC – D

M33063A

Reel of 2500

MC33063ADR

PDIP – P

Tube of 50

MC34063AP

MC34063AP

QFN – DRJ

Reel of 1000

MC34063ADRJR

ZYG

0°C to 70°C

Tube of 75

MC34063AD

SOIC – D

M34063A

Reel of 2500

MC34063ADR

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2)

Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.

FUNCTIONAL BLOCK DIAGRAM

2

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