LM2574中文资料0.5A Step-Down SMPS Regulator数据手册Microchip规格书

描述 Description

The LM2574 family is a series of easy to use fixed and adjustable switching voltage regulators. The LM2574 contains all of the active circuitry necessary to construct a stepdown (buck) switching regulator and requires a minimum of external components.The LM2574 is available in 3.3V, 5V, and 12V fixed output versions, or an adjustable version with an output voltage range of 1.23V to 37V. Output voltage is guaranteed to ±4% for specified input and load conditions.The LM2574 can supply 0.5A while maintaining excellent line and load regulation. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.An external shutdown connection selects operating or standby modes. Standby current is less than 200µA.Heat sinks are generally unnecessary due the regulator's high efficiency. Adequate heat transfer is usually provided by soldering all package pins to a printed circuit board.The LM2574 includes internal frequency compensation and an internal 52kHz fixed frequency oscillator guaranteed to ±10% of the frequency.Circuits constructed around the LM2574 use a standard series of inductors which are available from several different manufacturers.

特性 Features

3.3V, 5V, 12V, and adjustable output versions
Adjustable version output 1.23V to 37V ±4% Max. over Line and Load conditions.
Guaranteed 0.5A output current
Wide input voltage, up to 40V
Thermal shutdown and current limit protection
Requires only 4 external components.
Shutdown capability (standby mode)
Low power standby mode High efficiency
52kHz fixed frequency internal oscillator
Uses standard inductors

简介

LM2574属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的LM2574稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。