描述 Description

The LM2574 Buck Switching 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 loadwith 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. The Buck Switching Regulator is 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. Since the LM2574 converter is a switch-mode power supply, its efficiency is significantly higher in comparison with popular three-terminal linear regulators, especially with higher input voltages. In many cases, the power dissipated by the LM2574 regulator is so low, that no heatsink is required or its size could be reduced dramatically. The LM2574 features include a guaranteed 4% tolerance on output voltage within specified input voltages and output load conditions, and +/-10%on the oscillator frequency (+/-2% over 0C to 125C). External shutdown is included, featuring 80 uA typical standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

特性 Features

? 3.3 V, 5.0 V, 12 V, 15 V, and Adjustable Output Versions
? Adjustable Version Output Voltage Range of 1.23 V to 37 V +/-4%
? Guaranteed 0.5 A Output Current
? Wide Input Voltage Range: 4.75 V 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
? Moisture Sensitivity Level (MSL) Equals 1

應(yīng)用 Application

? Efficient Pre-Regulator for Linear Regulators
? On-Card Switching Regulators
? Power Supply for Battery Chargers
? Simple and High-Efficiency Step-Down (Buck) Regulators
? Automotive NCV Version Available

簡(jiǎn)介

LM2574屬于集成電路（IC）的DCDC開關(guān)穩(wěn)壓器。由制造生產(chǎn)的LM2574穩(wěn)壓器 - DC-DC 開關(guān)穩(wěn)壓器DC-DC 開關(guān)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(jí)設(shè)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(yīng)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(guān)元件，設(shè)備提供的電力會(huì)通過(guò)該元件。