© Semiconductor Components Industries, LLC, 2005

November, 2005 − Rev. 7

1

Publication Order Number:

MC34167/D

MC34167, MC33167

5.0 A, Step−Up/Down/

Inverting Switching

Regulators

The MC34167, MC33167 series are high performance fixed

frequency power switching regulators that contain the primary

functions required for dc−to−dc converters. This series was

specifically designed to be incorporated in step−down and

voltage−inverting configurations with a minimum number of external

components and can also be used cost effectively in step−up

applications.

These devices consist of an internal temperature compensated

reference, fixed frequency oscillator with on−chip timing components,

latching pulse width modulator for single pulse metering, high gain

error amplifier, and a high current output switch.

Protective features consist of cycle−by−cycle current limiting,

undervoltage lockout, and thermal shutdown. Also included is a low

power standby mode that reduces power supply current to 36

mA.

Features

Figure 1. Simplified Block Diagram

(Step Down Application)

EA

4

2

S

Q

R

UVLO

3

5

L

5.05 V/

5.0 A

Reference

Thermal

PWM

Oscillator

1

This device contains 143 active transistors.

TO−220

TH SUFFIX

CASE 314A

See detailed ordering and shipping information in the package

dimensions section on page 17 of this data sheet.

ORDERING INFORMATION

1

5

MARKING

DIAGRAMS

1

5

TO−220

TV SUFFIX

CASE 314B

1

5

Heatsink surface connected to Pin 3

TO−220

T SUFFIX

CASE 314D

Pin

1.

Voltage Feedback Input

2.

Switch Output

3.

Ground

4.

5.

Compensation/Standby

D2T SUFFIX

CASE 936A

Heatsink surface (shown as

terminal 6 in case outline

drawing) is connected to Pin 3

x

= 3 or 4

A

= Assembly Location

WL = Wafer Lot

Y

= Year

WW = Work Week

G

= Pb−Free Package

MC

3x167T

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1

5

15

http://onsemi.com

MC

3x167T

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MC

3x167T

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MC

3x167T

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