MIC4576-3.3WU-TR Microchip

MIC4576 200 kHz Simple 3A Buck Regulator Features General Description Fixed 200 kHz Operation The MIC4576 is a series of easy-to-use xed and adjustable BiCMOS step-down (buck) switch-mode 3.3V, 5V, and Adjustable Output Versions voltage regulators. The 200 kHz MIC4576 duplicates Voltage Over Specified Line and Load Conditions: the pinout and function of the 52 kHz LM2576. The - Fixed version: 3% maximum output voltage higher switching frequency may allow up to a 2:1 - Adjustable version: 2% maximum feedback reduction in output lter inductor size. voltage The MIC4576 is available in 3.3V, and 5V xed output Guaranteed 3A Switch Current versions or a 1.23V to 33V adjustable output version. Wide 4V to 36V Input Voltage Range Both versions are capable of driving a 3A load with Wide 1.23V to 33V Output Voltage Range excellent line and load regulation. Requires Minimum External Components The feedback voltage is guaranteed to 2% tolerance <200 A Typical Shutdown Mode for adjustable versions, and the output voltage is guaranteed to 3% for xed versions, within specied 75% Efficiency (Adjustable Version > 75% voltages and load conditions. The oscillator frequency Typical) is guaranteed to 10%. Standard Inductors are 25% of Typical LM2576 Inductor Values In Shutdown mode, the regulator draws less than 200 A shutdown current. The regulator performs Thermal Shutdown cycle-by-cycle current limiting and thermal shutdown Overcurrent Protection for protection under fault conditions. 100% Electrical Thermal Limit Burn-In This series of simple switch-mode regulators requires a minimum number of external components and can Applications operate using a standard series of inductors. Simple High-Efficiency Step-Down (Buck) Frequency compensation is provided internally. Regulator The MIC4576 is available in TO-220 (T) and TO-263 Efficient Preregulator for Linear Regulators (U) packages for the industrial temperature range. On-Card Switching Regulators Positive-to-Negative Converter (Inverting Package Types Buck-Boost) Battery Charger Negative Boost Converter 5 SHDN 4 FB Step-Down to 3.3V for Intel Pentium and Similar 3 GND Microprocessors 2 SW 1 V IN 5-Pin TO-220 (T) 5 SHDN 4 FB 3 GND 2 SW 1 V IN 5-Pin TO-263 (U) See Table 2-1 for pin information. 2019 Microchip Technology Inc. DS20006158A-page 1 TAAAB TAAABMIC4576 Typical Application Circuit Fixed Regulator L1 5V/3A 5 2 Shutdown SHDN SW Enable 33H MIC4576-5.0WT 8V to 36V 1 4 C2 V FB IN 1000F C1 GND 16V D1 470F 3 MBR360 63V Adjustable Regulator L1 12V/3A 5 2 Shutdown SHDN SW Enable 68H R2 MIC4576WT 13.0k 16V to 36V 4 1 C2 1% V FB IN 1000F C1 GND R1 16V 470F MBR360 1.50k 3 63V 1% DS20006158A-page 2 2019 Microchip Technology Inc.