MAX870, MAX871 开关电容电压反相器

max870, max871 开关电容电压反相器 max870, max871 pdf datasheet
max870, max871 概述
the ultra-small max870/max871 monolithic, cmos charge-pump inverters accept input voltages ranging from +1.4v to +5.5v. the max870 operates at 125khz, and the max871 operates at 500khz. their high efficiency (90%) and low operating current (0.7ma for the max870) make these devices ideal for both battery-powered and board-level voltage-conversion applications.
oscillator control circuitry and four power mosfet switches are included on-chip. a typical max870/ max871 application is generating a -5v supply from a +5v logic supply to power analog circuitry. both parts come in a 5-pin sot23-5 package and can deliver 25ma with a voltage drop of 500mv.
for a similar device with logic-controlled shutdown, refer to the max1720/max1721. for applications requiring more power, the max860 delivers up to 50ma with a voltage drop of 600mv, in a space-saving µmax package.
max870, max871 关键特性
5-pin sot23-5 package 99% voltage conversion efficiency invert input supply voltage 0.7ma quiescent current (max870) +1.4v to +5.5v input voltage require only two capacitors 25ma output current shutdown control
max870, max871 应用/使用
电池供电设备
蜂窝电话
手持终端、pda
从5v逻辑电源产生本地-5v电源
医疗仪器
小型lcd板
max870, max871应用电路
典型工作电路

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