MC34167

MC33167

Order this document by MC34167/D

SEMICONDUCTOR

TECHNICAL DATA

POWER SWITCHING

REGULATORS

T SUFFIX

PLASTIC PACKAGE

CASE 314D

ORDERING INFORMATION

Device

Operating

Temperature Range

Package

Pin 1. Voltage Feedback Input

2. Switch Output

3. Ground

4. Input Voltage/VCC

5. Compensation/Standby

TH SUFFIX

PLASTIC PACKAGE

CASE 314A

TV SUFFIX

PLASTIC PACKAGE

CASE 314B

Heatsink surface (shown as terminal 6

in case outline drawing) is connected to Pin 3.

Heatsink surface connected to Pin 3.

D2T SUFFIX

PLASTIC PACKAGE

CASE 936A

(D2PAK)

5

1

5

1

5

1

5

1

MC34167D2T

MC34167T

MC34167TH

MC34167TV

TA = 0° to + 70°C

Surface Mount

Straight Lead

Horiz. Mount

Vertical Mount

MC33167D2T

MC33167T

MC33167TH

MC33167TV

TA = – 40° to +85°C

Surface Mount

Straight Lead

Horiz. Mount

Vertical Mount

1

MOTOROLA ANALOG IC DEVICE DATA

Power 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

µA.

Simplified Block Diagram

(Step Down Application)

EA

VO

ILIMIT

Vin

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.

© Motorola, Inc. 1996

Rev 3