描述 Description

The MCP1811/12 devices are 150 mA (MCP1811) and 300 mA (MCP1812) low dropout (LDO) linear regulators that provide high-current and low-output voltages while maintaining an ultra-low 250 nA of quiescent current during device operation. In addition, the MCP1811B/12B can be shut down for 5 nA (typical) supply current draw.The MCP1811/12 family comes in nine standard fixed output-voltage versions: 1V, 1.2V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.3V, and 4.0V. The 150/300 mA output current capability, combined?with the low output-voltage capability, make the MCP1811/12 device family a good choice for new ultra-long-life LDO applications that have high-current demands, but require ultra-low power consumption during sleep periods.The MCP1811/12 is stable with ceramic output capacitors that inherently provide lower output noise and reduce the size and cost of the entire regulator solution. Only 1 μF (2.2 μF for MCP1812) of output capacitance is needed to assure the stability of the?system with a low noise output.The MCP1811/12 can be paired with other ultra-low current devices, such as Microchip’s nanoWatt?eXtreme Low Power (XLP) technology devices, for a complete ultra-low-power solution.

特性 Features

Ultra-Low Quiescent Current: 250 nA (typical)
Ultra-Low Shutdown Supply Current: 10 nA typ (MCP1811A) and 5 nA typ (MCP1811B)
Input Voltage Range: 1.8V to 5.5V
Standard Output Voltages: 1.0V, 1.2V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.3V and 4.0V
Low Dropout Voltage: 400 mV (typical) w/ Small Variation Over Load Range
Stable with Ceramic Output Capacitor: 1.0 uF
Overcurrent Protection w/ Foldback
Output Discharge (MCP1811A)
Available in 3 and 5 lead SOT-23, 3 and 5 lead SC70, 4 lead 1x1mm UDFN

簡(jiǎn)介

MCP1811屬于集成電路（IC）的線(xiàn)性+開(kāi)關(guān)穩(wěn)壓器。由制造生產(chǎn)的MCP1811穩(wěn)壓器 - 線(xiàn)性線(xiàn)性穩(wěn)壓器用于提供穩(wěn)定的輸出電壓，無(wú)論負(fù)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(gè)最小量，并且在工作時(shí)會(huì)將輸入端的任何多余電壓轉(zhuǎn)換為熱量。對(duì)于大多數(shù)應(yīng)用而言，雖然這種穩(wěn)壓器的效率低于開(kāi)關(guān)模式的穩(wěn)壓器，但它們通常更適合對(duì)噪聲高度敏感的應(yīng)用。