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LM2576-12BU Datasheet(PDF) 1 Page - Micrel Semiconductor |
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LM2576-12BU Datasheet(HTML) 1 Page - Micrel Semiconductor |
1 / 9 page August 2005 1 M9999-082605-B LM2576 Micrel, Inc. LM2576 52kHz Simple 3A Buck Regulator General Description The LM2576 series of monolithic integrated circuits provide all the active functions for a step-down (buck) switching regulator. Fixed versions are available with a 3.3V, 5V, or 12V fixed output. Adjustable versions have an output voltage range from 1.23V to 37V. Both versions are capable of driving a 3A load with excellent line and load regulation. These regulators are simple to use because they require a minimum number of external components and include internal frequency compensation and a fixed-frequency oscillator. The LM2576 series offers a high efficiency replacement for popular three-terminal adjustable linear regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is required. A standard series of inductors available from several different manufacturers are ideal for use with the LM2576 series. This feature greatly simplifies the design of switch-mode power supplies. The feedback voltage is guaranteed to ±2% tolerance for adjustable versions, and the output voltage is guaranteed to ±3% for fixed versions, within specified input voltages and output load conditions. The oscillator frequency is guaranteed to ±10%. External shutdown is included, featuring less than 200 µA standby current. The output switch includes cycle-by- cycle current limiting and thermal shutdown for full protection under fault conditions. Typical Applications Features • 3.3V, 5V, 12V, and adjustable output versions • Voltage over specified line and load conditions: Fixed version: ±3% max. output voltage Adjustable version: ±2% max. feedback voltage • Guaranteed 3A output current • Wide input voltage range: 4V to 40V • Wide output voltage range 1.23V to 37V • Requires only 4 external components • 52kHz fixed frequency internal oscillator • Low power standby mode I Q typically < 200µA • 80% efficiency (adjustable version typically > 80%) • Uses readily available standard inductors • Thermal shutdown and current limit 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) • Isolated Flyback Converter using minimum number of external components • Negative Boost Converter R2 R1 7V–40V Unregulated DC Input LM2575 + CIN 100µF +VIN 1 3 Gnd 5 On/Off 2 Output 4 Feedback L1 330µH + D1 1N5822 COUT 330µF R2 3.09k R1 1k VOUT = 1.23 1 + ( ) +5V, 1A Regulated Output Note: Pin numbers are for TO-220 Package 7V–40V Unregulated DC Input LM2575-5.0 + CIN 100µF +VIN 1 3 Gnd 5 On/Off 2 Output 4 Feedback L1 330µH + D1 1N5822 COUT 330µF +5V, 1A Regulated Output Note: Pin numbers are for TO-220 Package Fixed Regulator in Typical Application Adjustable Regulator in Fixed Output Application Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com |
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