LD2981数据手册集成电路（IC）的线性+开关稳压器规格书PDF

描述 Description

The LD2981 is a 100 mA fixed-output voltage regulator. The low-drop voltage and the ultra low quiescent current make them suitable for low noise, low power applications and in battery powered systems.

The quiescent current in sleep mode is less than 1 μA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin n° 3 (TTL compatible). This means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The LD2981 is designed to work with low ESR ceramic capacitor. Typical applications are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.

特性 Features

• Ultra low dropout voltage (0.17 V typ. at 100 mA load, 7 mV typ. at 1 mA load)
• Very low quiescent current (80 μA typ. at no load in on mode; max 1 μA in off mode)
• Guaranteed output current up to 100 mA
• Logic-controlled electronic shutdown
• Output voltage of 2.5; 3.0; 3.3; 5.0 V
• Internal current and thermal limit
• ± 0.75% tolerance output voltage available (A version)
• Output low noise voltage 160 μVRMS
• Temperature range: -40 to 125 °C
• Small package SOT23-5L and SOT-89
• Fast dynamic response to line and load changes

简介

LD2981属于集成电路（IC）的线性+开关稳压器。由制造生产的LD2981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。