MC33166 Datasheet | Motorola Semiconductor

Order this document by MC34166/D Power 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 ponents and can also be used cost effectively in step- up applications. These devices consist of an internal temperature pensated reference, fixed frequency oscillator with on- chip timing ponents, 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 MC34166 MC33166 POWER SWITCHING REGULATORS SEMICONDUCTOR TECHNICAL DATA TH SUFFIX PLASTIC PACKAGE CASE 314A - - - - - - - - - - - Fixed Frequency Oscillator (72 k Hz) 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 D2PAK Package 5 1 1 5 TV SUFFIX PLASTIC PACKAGE CASE 314B Heatsink surface connected to Pin 3. T SUFFIX PLASTIC PACKAGE CASE 314D 1 5 Simplified Block Diagram (Step Down Application) ILIMIT Oscillator 4 Pin 1. 2. 3. 4. 5. Vin Voltage Feedback Input Switch Output Ground Input Voltage/VCC pensation/Standby D2T SUFFIX PLASTIC PACKAGE CASE 936A (D2PAK) S Q R 2 Heatsink surface (shown as terminal 6 in case outline drawing) is connected to Pin 3. ORDERING INFORMATION UVLO Thermal...