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 0.25?) 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

簡介

L4971屬于集成電路（IC）的穩(wěn)壓器-DC-DC開關(guān)穩(wěn)壓器。由制造生產(chǎn)的L4971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)備提供的電力會通過該元件。