رگولاتور LM2576T-3.3V 3A

1FEATURES DESCRIPTION
The LM2576 series of regulators are monolithic 23• 3.3V, 5V, 12V, 15V, and Adjustable Output
Versions integrated circuits that provide all the active functions
for a step-down (buck) switching regulator, capable of
• Adjustable Version Output Voltage driving 3A load with excellent line and load regulation.
Range,1.23V to 37V (57V for HV Version) ±4% These devices are available in fixed output voltages
Max Over Line and Load Conditions of 3.3V, 5V, 12V, 15V, and an adjustable output
• Specified 3A Output Current version.
• Wide Input Voltage Range, 40V Up to 60V for Requiring a minimum number of external
HV Version components, these regulators are simple to use and
• Requires Only 4 External Components include internal frequency compensation and a fixedfrequency
oscillator.
• 52 kHz Fixed Frequency Internal Oscillator
• TTL Shutdown Capability, Low Power Standby The LM2576 series offers a high-efficiency
Mode replacement for popular three-terminal linear regulators. It substantially reduces the size of the
• High Efficiency heat sink, and in some cases no heat sink is
• Uses Readily Available Standard Inductors required.
• Thermal Shutdown and Current Limit A standard series of inductors optimized for use with
Protection the LM2576 are available from several different
• P+ Product Enhancement Tested manufacturers. This feature greatly simplifies the
design of switch-mode power supplies.
APPLICATIONS Other features include a specified ±4% tolerance on
• Simple High-Efficiency Step-Down (Buck) output voltage within specified input voltages and
Regulator output load conditions, and ±10% on the oscillator
frequency. External shutdown is included, featuring
• Efficient Pre-Regulator for Linear Regulators 50 μA (typical) standby current. The output switch
• On-Card Switching Regulators includes cycle-by-cycle current limiting, as well as
• Positive to Negative Converter (Buck-Boost) thermal shutdown