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MIC4574-5.0BN Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC4574-5.0BN Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 6 page MIC4574 Micrel 4-92 April 1998• MIC4574 200kHz Simple 0.5A Buck Voltage Regulator General Description The MIC4574 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200kHz MIC4574 duplicates the pinout and function of the 52kHz LM2574. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size. The MIC4574 is available in 3.3V, and 5V fixed output versions or a 1.23V to 20V adjustable output version. Both versions are capable of driving a 0.5A 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 standby 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 compensa- tion is provided internally. The MIC4574 is available in DIP (N) and SOIC (WM) pack- ages for the industrial temperature range. Typical Applications C1 47µF 35V D1 1N5819 C2 220µF 16V L1 100µH SGND FB SW MIC4574-5.0BN SHDN 8V to 24V 5.0V/0.5A VIN PGND 24 1 7 3 5 Shutdown Enable Fixed Regulator C1 10µF 35V D1 C2 330µF 6.3V L1 100µH SGND FB SW MIC4574BWM SHDN 6V to 24V 3.3V/0.5A VIN R2 2.49k 1% R1 1.50k 1% PGND 3 12 6 4 10 5 C3 3300pF MBRS130LT3 Shutdown Enable Adjustable Regulator Features • Fixed 200kHz operation • 3.3V, 5V, and adjustable output versions • Voltage over specified line and load conditions: Fixed version: ±3% max. output voltage Adjustable version: ±2% max. feedback voltage • Guaranteed 0.5A switch current • Wide 4V to 24V input voltage range • Wide 1.23V to 20V output voltage range • Requires minimum external components • < 200 µA typical shutdown mode • 75% efficiency (adjustable version > 75% typ.) • Standard inductors and capacitors are 25% of typical LM2574 values • Thermal shutdown • Overcurrent protection • 100% electrical thermal limit burn-in Applications • Simple high-efficiency step-down (buck) regulator • Efficient preregulator for linear regulators • On-card switching regulators • Positive-to-negative converter (inverting buck-boost) • Isolated flyback converter using minimum external components • Negative boost converter |
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