L4938EPD中文资料高级稳压器数据手册ST规格书

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

简介

L4938EPD属于集成电路（IC）的线性+开关稳压器。由制造生产的L4938EPD稳压器 - 线性线性稳压器用于提供稳定的输出电压，无论负载电流、输入电压或环境因素如何变化，这些输出电压通常都要保持不变。它们的工作原理要求输入电压维持在高于所需的输出电压，而且要超出某个最小量，并且在工作时会将输入端的任何多余电压转换为热量。对于大多数应用而言，虽然这种稳压器的效率低于开关模式的稳压器，但它们通常更适合对噪声高度敏感的应用。