描述 Description

The L4938ED and L4938EPD are monolithic integrated dual voltage regulators with two very low dropout outputs and additional functions such as power-on reset and input voltage sense. They are designed for supplying microcomputer controlled systems especially in automotive applications.

特性 Features

? Output 2 voltage 5 V ± 2% with 400 mA current capability (ADJ wired to VOUT2)
? High precision standby output voltage 5 V ± 1% with 100 mA current capability
? Output 2 disable function for standby mode
? Enable and sense inputs (EN, SI) protected against negative transients down to -5 V
? Extremely low quiescent current, 65 μA (less than 90 μA) in standby mode
? Reset threshold adjustable from 3.8 V to 4.7 V
? Operating transient supply voltage up to 40 V
? Output 2 voltage adjustable by external voltage divider
? Operating DC supply voltage range 5 V - 28 V

簡介

L4938EPD屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由制造生產(chǎn)的L4938EPD穩(wěn)壓器 - 線性線性穩(wěn)壓器用于提供穩(wěn)定的輸出電壓，無論負(fù)載電流、輸入電壓或環(huán)境因素如何變化，這些輸出電壓通常都要保持不變。它們的工作原理要求輸入電壓維持在高于所需的輸出電壓，而且要超出某個(gè)最小量，并且在工作時(shí)會(huì)將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對(duì)于大多數(shù)應(yīng)用而言，雖然這種穩(wěn)壓器的效率低于開關(guān)模式的穩(wěn)壓器，但它們通常更適合對(duì)噪聲高度敏感的應(yīng)用。