深圳市勤思达科技有限公司

1 Features

1• 3.3-V, 5-V, 12-V, 15-V, and Adjustable Output

Versions

• Adjustable Version Output Voltage Range,1.23 V

to 37 V (57 V for HV Version) ±4% Maximum Over

Line and Load Conditions

• Specified 3-A Output Current

• Wide Input Voltage Range: 40 V Up to 60 V for

HV Version

• Requires Only 4 External Components

• 52-kHz Fixed-Frequency Internal Oscillator

• TTL-Shutdown Capability, Low-Power Standby

Mode

• High Efficiency

• Uses Readily Available Standard Inductors

• Create a Custom Design with WEBENCH Tools

• Thermal Shutdown and Current Limit Protection

2 Applications

• Simple High-Efficiency Step-Down (Buck)

Regulator

• Efficient Preregulator for Linear Regulators

• On-Card Switching Regulators

• Positive-to-Negative Converter (Buck-Boost)

The LM2576 series of regulators are monolithic

integrated circuits that provide all the active functions

for a step-down (buck) switching regulator, capable of

driving 3-A load with excellent line and load

regulation. These devices are available in fixed output

voltages of 3.3 V, 5 V, 12 V, 15 V, and an adjustable

output version.

Requiring a minimum number of external

components, these regulators are simple to use and

include fault protection and a fixed-frequency

oscillator