MIC4576-5BU IC - Step Down Regulator IC

The MIC4576 is a series of easy-to-use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200 kHz MIC4576 duplicates the pinout and function of the 52 kHz LM2576. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size. The MIC4576 is available in 3.3V, and 5V fixed output versions or a 1.23V to 33V adjustable output version. Both versions are capable of driving a 3A load with excellent line and load regulation. The feedback voltage is guaranteed to ±2% tolerance for adjustable versions, and the output voltage is guaranteed to ±3% for fixed versions, within specified voltages and load conditions. The oscillator frequency is guaranteed to ±10%. In Shutdown mode, the regulator draws less than 200 µA shutdown current. The regulator performs cycle-by-cycle current limiting and thermal shutdown for protection under fault conditions. This series of simple switch-mode regulators requires a minimum number of external components and can operate using a standard series of inductors. Frequency compensation is provided internally. The MIC4576 is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range. Features:- • Fixed 200 kHz Operation • 3.3V, 5V, and Adjustable Output Versions • Voltage Over Specified Line and Load Conditions: - Fixed version: ±3% maximum output voltage - Adjustable version: ±2% maximum feedback voltage • Guaranteed 3A Switch Current • Wide 4V to 36V Input Voltage Range • Wide 1.23V to 33V Output Voltage Range • Requires Minimum External Components • <200 µA Typical Shutdown Mode • 75% Efficiency (Adjustable Version > 75% Typical) • Standard Inductors are 25% of Typical LM2576 Inductor Values • Thermal Shutdown • Over current Protection • 100% Electrical Thermal Limit Burn-In Specification:- Parameter Specification Supply Voltage (VIN) 40V Shutdown Voltage (VSHDN) –0.3V to +36V Output Switch (VSW), Steady State –1V Feedback Voltage (VFB) [Adjustable] 3.8V Storage Temperature (TS) –65°C to +150°C Junction Temperature (TJ) 150°C Related Document:- MIC4576 IC Data Sheet