MC33166 查看數據表（PDF） - ON Semiconductor

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MC33166

3.0 A, Step−Up/Down/Inverting Switching Regulators

ON Semiconductor 

MC34166, MC33166

3.0 A, Step−Up/Down/

Inverting Switching

Regulators

The MC34166, MC33166 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

• Output Switch Current in Excess of 3.0 A

• Fixed Frequency Oscillator (72 kHz) with On−Chip Timing

• Provides 5.05 V Output without External Resistor Divider

• Precision 2% Reference

• 0% to 95% Output Duty Cycle

• Cycle−by−Cycle Current Limiting

• Undervoltage Lockout with Hysteresis

• Internal Thermal Shutdown

• Operation from 7.5 V to 40 V

• Standby Mode Reduces Power Supply Current to 36 mA

• Economical 5−Lead TO−220 Package with Two Optional Leadforms

• Also Available in Surface Mount D2PAK Package

• Moisture Sensitivity Level (MSL) Equals 1

• Pb−Free Packages are Available

Vin

ILIMIT

4

Oscillator

S

Q

R

2

PWM

UVLO

Thermal

L

Reference

EA

1

VO

5.05 V/

3.0 A

3

5

This device contains 143 active transistors.

Figure 1. Simplified Block Diagram

(Step Down Application)

http://onsemi.com

x = 3 or 4

A = Assembly Location

WL = Wafer Lot

Y = Year

WW = Work Week

G = Pb−Free Package

MARKING

DIAGRAMS

1

5

TO−220

TH SUFFIX

CASE 314A

MC

3x166T

AWLYWWG

1

5

TO−220

TV SUFFIX

CASE 314B

MC

3x166T

AWLYWWG

Heatsink surface connected to Pin 3

TO−220

MC

T SUFFIX

3x166T

CASE 314D AWLYWWG

1

5

Pin 1. Voltage Feedback Input

2. Switch Output

3. Ground

4. Input Voltage/VCC

5. Compensation/Standby

1

5

D2PAK

D2T SUFFIX

CASE 936A

MC

3x166T

AWLYWWG

Heatsink surface (shown as

terminal 6 in case outline

1

5

drawing) is connected to Pin 3

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 2 of this data sheet.

© Semiconductor Components Industries, LLC, 2005

1

October, 2005 − Rev. 7

Publication Order Number:

MC34166/D

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