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