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MC34166, MC33166 Inverting Switching Regulators - Step-Up/Down 3.0 A 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 http://onsemi.com designed to be incorporated in step-down and voltage-inverting configurations with a minimum number of external components and MARKING can also be used cost effectively in step-up applications. x = 3 or 4 DIAGRAMS These devices consist of an internal temperature compensated A = Assembly Location reference, fixed frequency oscillator with on-chip timing components, WL = Wafer Lot latching pulse width modulator for single pulse metering, high gain Y = Year error amplifier, and a high current output switch. WW = Work Week Protective features consist of cycle-by-cycle current limiting, G = Pb-Free Package undervoltage lockout, and thermal shutdown. Also included is a low power standby mode that reduces power supply current to 36 mA. TO-220 MC Features TH SUFFIX 3x166T · Output Switch Current in Excess of 3.0 A CASE 314A AWLYWWG · Fixed Frequency Oscillator (72 kHz) with On-Chip Timing 1 · Provides 5.05 V Output without External Resistor Divider 5 · Precision 2% Reference · 0% to 95% Output Duty Cycle · Cycle-by-Cycle Current Limiting · Undervoltage Lockout with Hysteresis TO-220 MC · Internal Thermal Shutdown TV SUFFIX 3x166T 1 AWLYWWG · Operation from 7.5 V to 40 V CASE 314B · Standby Mode Reduces Power Supply Current to 36 mA 5 · Economical 5-Lead TO-220 Package with Two Optional Leadforms