LM2574N-3.3屬于集成電路（IC）的DCDC開關穩(wěn)壓器。由安森美半導體公司制造生產(chǎn)的LM2574N-3.3穩(wěn)壓器 - DC-DC 開關穩(wěn)壓器DC-DC 開關穩(wěn)壓器 PMIC（電源管理集成電路）產(chǎn)品族中的產(chǎn)品是元器件級設備，用于需要穩(wěn)定 DC 輸入電壓和/或?qū)⑵滢D(zhuǎn)換為不同幅度的輸出電壓的應用。這些器件與稱為“控制器”PMIC 的類似產(chǎn)品的區(qū)別在于集成了主開關元件，設備提供的電力會通過該元件。

The LM2574 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step?down switching regulator (buck converter). All circuits of this series are 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, 5.0 V, 12 V, 15 V, and an adjustable output version.

These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2574 are offered by several different inductor manufacturers.

特性 Features

? 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions

? Adjustable Version Output Voltage Range, 1.23 to 37 V ±4 max over Line and Load Conditions

? Guaranteed 0.5 A Output Current

? Wide Input Voltage Range: 4.75 to 40 V

? 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

? NCV Prefix for Automotive and Other Applications Requiring Site and Control Changes

? Pb?Free Packages are Available*

Applications

? Simple and High?Efficiency Step?Down (Buck) Regulators

? Efficient Pre?regulator for Linear Regulators

? On?Card Switching Regulators

? Positive to Negative Converters (Buck?Boost)

? Negative Step?Up Converters

? Power Supply for Battery Chargers