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MAX870

Maxim
Part Number MAX870
Manufacturer Maxim
Description Switched-Capacitor Voltage Inverters
Published May 2, 2005
Detailed Description 19-1240; Rev 0; 6/97 Switched-Capacitor Voltage Inverters _______________General Description The ultra-small MAX870/MAX...
Datasheet PDF File MAX870 PDF File

MAX870
MAX870

Overview
19-1240; Rev 0; 6/97 Switched-Capacitor Voltage Inverters _______________General Description 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 applications requiring more power, the MAX860 delivers up to 50mA with a voltage drop of 600mV, in a space-saving µMAX package.
____________________________Features o 5-Pin SOT23-5 Package o 99% Voltage Conversion Efficiency o Invert Input Supply Voltage o 0.
7mA Quiescent Current (MAX870) o +1.
4V to +5.
5V Input Voltage Range o Require Only Two Capacitors o 25mA Output Current o Shutdown Control MAX870/MAX871 ______________Ordering Information PART MAX870C/D MAX870EUK MAX871C/D MAX871EUK TEMP.
RANGE 0°C to +70°C -40°C to +85°C 0°C to +70°C -40°C to +85°C PINPACKAGE Dice* 5 SOT23-5 Dice* 5 SOT23-5 SOT TOP MARK — ABZN — ABZO ________________________Applications Local -5V Supply from 5V Logic Supply Small LCD Panels Cell Phones Medical Instruments Handy-Terminals, PDAs Battery-Operated Equipment * Dice are tested at TA = +25°C.
__________Typical Operating Circuit __________________Pin Configuration 5 C1+ IN 2 INPUT SUPPLY VOLTAGE TOP VIEW MAX870 MAX871 3 C1OUT 4 1 NEGATIVE OUTPUT VOLTAGE OUT 1 5 C1+ IN 2 MAX870 MAX871 4 GND C1- 3 GND SOT23-5 NEGATIVE VOLTAGE CONVERTER ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http:...


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