L4971中文资料1.5A开关稳压器数据手册ST规格书

描述 Description

The L4971 is a step down monolithic power switching regulator delivering 1.5A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25Ω) to obtain very high efficency and high switching speed.

A switching frequency up to 300KHz is achievable (the maximum power dissipation of the packages must be observed).

A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today’s applications.

Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.

The device is available in plastic dual in line, DIP8 for standard assembly, and SO16W for SMD assembly.

特性 Features

• PROTECTION AGAINST FEEDBACK DISCONNECTION
• INHIBIT FOR ZERO CURRENT CONSUMPTION
• SOFT START FUNCTION
• THERMAL SHUTDOWN
• ZERO LOAD CURRENT OPERATION
• VOLTAGE FEEDFORWARD
• UP TO 1.5A STEP DOWN CONVERTER
• PRECISE 3.3V (±1%) INTERNAL REFERENCE VOLTAGE
• OPERATING INPUT VOLTAGE FROM 8V TO 55V
• SWITCHING FREQUENCY ADJUSTABLE UP TO 300KHz
• INTERNAL CURRENT LIMITING (PULSE-BY PULSE AND HICCUP MODE)
• OUTPUT VOLTAGE ADJUSTABLE FROM 3.3V TO 50V

简介

L4971属于集成电路（IC）的稳压器-DC-DC开关稳压器。由制造生产的L4971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。