MIC5249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 MIC5249 is an efficient, precise 300mA CMOS voltage regulator with power-on reset delay which can be implemented via an external capacitor. It offers 1% initial accuracy, extremely low dropout voltage (typically 400mV @ 300mA), and low ground current (typically 85mA) over load. Designed specifically for noise-critical applications in handheld or battery-powered devices, the MIC5249 comes equipped with a noise reduction feature to filter the output noise via an external capacitor. Other features of the MIC5249 include a logic-compatible enable pin, current limit, thermal shutdown, ultra-fast transient response, and an active clamp to speed up device turnoff. The MIC5249 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices.

特性 Features

• 300mA output current
• High PSRR: 65dB at 120Hz
• Stable with ceramic output capacitor
• Power-on reset output with adjustable delay time
• ±1.0% initial accuracy
• ±3.0% over temperature
• Low dropout voltage: 400mV at 300mA
• Low quiescent current: 85mA
• Zero off-mode current state
• Thermal shutdown protection
• Current limit protection
• Tiny MSOP-8 package

简介

MIC5249属于集成电路（IC）的线性+开关稳压器。由制造生产的MIC5249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。