MIC5259中文資料Low Drop Out Regulator, 300mA High PSRR數(shù)據(jù)手冊Microchip規(guī)格書

描述 Description

The MIC5259 is an efficient CMOS voltage regulator optimized for low-noise applications. It offers 1.5% initial accuracy, low dropout voltage (300mV at 300mA), and low ground current (typically 105μA at light load). The MIC5259 provides a very low noise output, ideal for RF applications where a clean voltage source is required. The MIC5259 has a high PSRR even at low supply voltages, critical for battery-operated electronics. A noise bypass pin is also available for further reduction of output noise.Designed specifically for handheld and battery-powered devices, the MIC5259 provides a TTL logic-compatible enable pin. When disabled, power consumption drops to nearly zero. The MIC5259 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications; a critical issue in handheld wireless devices. Key features include current limit, thermal shutdown, faster transient response, and an active clamp to speed up device turnoff. The MIC5259 is available in Thin SOT-23-5 package in a wide range of output voltages.

特性 Features

? Input voltage range: 2.7V to 6.0V
? PSRR: 70dB at 1kHz
? Low output noise: 30μVrms
? Stability with ceramic output capacitors
? Low dropout: 300mV at 300mA
? 1.5% initial accuracy
? 3.0% over temperature
? Low quiescent current: 105μA
? Tight load and line regulation
? TTL logic-controlled enable input
? Zero off-mode current state
? Thermal shutdown and current limit protection

簡介

MIC5259屬于集成電路（IC）的線性+開關(guān)穩(wěn)壓器。由Microchip制造生產(chǎn)的MIC5259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，而且要超出某個最小量，并且在工作時會將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對于大多數(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噪聲高度敏感的應(yīng)用。