MIC2954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 MIC2954 is a \"bulletproof\", efficient voltage regulator with very low dropout voltage (typically 40mV at light loads and 375mV at 250mA) and low quiescent current (120µA typical). The quiescent current of the MIC2954 increases only slightly in dropout, thus prolonging battery life. Key MIC2954 features include protection against reversed battery, fold-back current limiting, and automotive load-dump protection (60V positive transient). The MIC2954-07/08BM is an adjustable version that includes an error flag output that warns of a low output voltage, which is often due to failing batteries on the input. This may also be used as a power-on reset. A logic-compatible shutdown input is provided which enables the regulator to be switched on and off. This part may be pin-strapped for 5V output or programmed from 1.24V to 29V with the use of two external resistors. The MIC2954 is available in two voltage tolerances, ±0.5% maximum and ±1% maximum. Both are guaranteed for junction temperatures from -40°C to +125°C. The MIC2954 has a very low output voltage temperature coefficient and extremely good load and line regulation (0.04% typical).

特性 Features

• High-accuracy: 5V, guaranteed 250mA output
• Low quiescent current
• Low dropout voltage
• Extremely tight load and line regulation
• Very low temperature coefficient
• Current and thermal limiting
• Input can withstand -20V reverse battery and +60V positive transients
• Error flag warns of low output voltage
• Logic-controlled electronic shutdown
• Output programmable from 1.24V to 29V (MIC2954-07/08)
• Available in TO-220, TO-92, and surface-mount SOT-223 and SOP-8 packages

简介

MIC2954属于集成电路（IC）的线性+开关稳压器。由制造生产的MIC2954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。