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MIC4575-3.3WU Datasheet(PDF) 1 Page - Micrel Semiconductor |
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MIC4575-3.3WU Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 15 page MIC4575 200kHz Simple 1A Buck Regulator Pentium is a registered trademark of Intel Corporation Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( 408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com July 2009 1 M9999-072909 General Description The MIC4575 is a series of easy to use fixed and adjustable BiCMOS step-down (buck) switch-mode voltage regulators. The 200kHz MIC4575 duplicates the pinout and function of the 52kHz LM2575. The higher switching frequency may allow up to a 2:1 reduction in output filter inductor size. The MIC4575 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 1A 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 200µA 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 comp- ensation is provided internally. The MIC4575 is available in TO-220 (T) and TO-263 (U) packages for the industrial temperature range. Data sheets and support documentation can be found on Micrel’s web site at www.micrel.com. 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 1A switch current • Wide 4V to 24V input voltage range • Wide 1.23V to 20V output voltage range • Requires minimum external components • < 200µA typical shutdown mode • 75% efficiency (adjustable version > 75% typical) • Standard inductors and capacitors are25% of typical LM2575 values • Thermal shutdown • Overcurrent protection • 100% electrical thermal limit burn-in Applications • Simple high-efficiency step-down (buck) regulator • Efficient pre-regulator for linear regulators • On-card switching regulators • Positive-to-negative converter (inverting buck-boost) • Battery charger • Negative boost converter • Step-down 6V to 3.3V for Intel Pentium® and similar microprocessors ___________________________________________________________________________________________________________ Typical Application C1 150µF 35V D1 1N5819 C2 330µF 16V L1 68µH GND FB SW MIC4575-5.0_T SHDN 8V to 24V 5.0V/1A VIN 3 4 2 5 1 Shutdown Enable Fixed Regulator Adjustable Regulator |
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