LM2576
Micrel
LM2576
52kHz Simple 3A Buck Voltage Regulator
General Description
The LM2576 series of monolithic integ...
LM2576
Micrel
LM2576
52kHz Simple 3A Buck Voltage
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 200µA standby current. The output switch includes cycle-bycycle current limiting and thermal shutdown for full protection under fault conditions.
Features
3.3V, 5V, 12V, and adjustable...