Datasheet > MAX871

MAX871

更新时间： 2024-11-02 14:57:19

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MAX871 数据手册

19-1240; Rev 1; 2/04

Switched-Capacitor Voltage Inverters

General Description

Features

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 efficien-

cy (90%) and low operating current (0.7mA for the

MAX870) make these devices ideal for both battery-pow-

ered and board-level voltage-conversion applications.

ꢀ 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 Range

ꢀ Require Only Two Capacitors

ꢀ 25mA Output Current

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.

ꢀ Shutdown Control

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.

Ordering Information

PIN-

SOT

PART

TEMP RANGE

PACKAGE TOP MARK

MAX870EUK

MAX871EUK

-40°C to +85°C 5 SOT23-5

ABZN

ABZO

________________________Applications

Local -5V Supply from 5V Logic Supply

Small LCD Panels

Cell Phones

Medical Instruments

Handy-Terminals, PDAs

Battery-Operated Equipment

Pin Configuration

Typical Operating Circuit

TOP VIEW

INPUT

SUPPLY

VOLTAGE

C1+

MAX870

MAX871

OUT

C1+

MAX870

MAX871

C1-

NEGATIVE

OUTPUT

VOLTAGE

OUT

C1-

GND

SOT23-5

NEGATIVE VOLTAGE CONVERTER

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7 8

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