LM2576 Micrel, Inc. LM2576
52kHz Simple 3A Buck Regulator General Description Features 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
The feedback voltage is guaranteed to В±2% tolerance for
adjustable versions, and the output voltage is guaranteed to
В±3% for fixed versions, within specified input voltages and
output load conditions. The oscillator frequency is guaranteed
to В±10%. External shutdown is included, featuring less than …