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 µA.

 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 µA

 Economical 5–Lead TO–220 Package with Two Optional Leadforms

 Also Available in Surface Mount D2

PAK Package

 Moisture Sensitivity Level (MSL) Equals 1

 

 

 

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