LM2574MX-3.3/NOPB

LM2574MX-3.3/NOPB 编带

Description

The LM2574xx series of regulators are monolithic integrated circuits that provide all the active functions for a step-down buck switching regulator, capable of driving a 0.5-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 internal frequency compensation and a fixed frequency oscillator.

Features

• 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 0.5-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

• Thermal Shutdown and Current-Limit Protection

Applications

• Simple High-Efficiency Step-Down Buck Regulator

• Efficient Preregulator for Linear Regulators

• On-Card Switching Regulators

• Positive-to-Negative Converter Buck-Boost