Rainbow-electronics MAX871 Manual do Utilizador descarregar pdf

_______________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 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.

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.

________________________Applications

Local -5V Supply from 5V Logic Supply

Small LCD Panels

Cell Phones

Medical Instruments

Handy-Terminals, PDAs

Battery-Operated Equipment

____________________________Features

♦ 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

♦ Shutdown Control

MAX870/MAX871

Switched-Capacitor Voltage Inverters

________________________________________________________________

Maxim Integrated Products

TOP VIEW

GND

C1-

C1+

OUT

SOT23-5

MAX870

MAX871

__________________Pin Configuration

NEGATIVE VOLTAGE CONVERTER

C1+

C1-

OUT

GND

INPUT

SUPPLY

VOLTAGE

NEGATIVE

OUTPUT

VOLTAGE

MAX870

MAX871

__________Typical Operating Circuit

19-1240; Rev 0; 6/97

PART

MAX870C/D

MAX870EUK -40°C to +85°C

0°C to +70°C

TEMP. RANGE

PIN-

PACKAGE

Dice*

5 SOT23-5

______________Ordering Information

Dice are tested at T

= +25°C.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

MAX871C/D

MAX871EUK -40°C to +85°C

0°C to +70°C Dice*

5 SOT23-5

SOT

TOP MARK

—

ABZN

—

ABZO

1 2 3 4 5 6 7 8

MAX870/MAX871 1

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Página 1 - MAX870/MAX871

_______________General DescriptionThe ultra-small MAX870/MAX871 monolithic, CMOScharge-pump inverters accept input voltages rangingfrom +1.4V to +5.5V

Página 2

MAX870/MAX871Switched-Capacitor Voltage Inverters2 _______________________________________________________________________________________ABSOLUTE MAX

Página 3

MAX870/MAX871Switched-Capacitor Voltage Inverters_______________________________________________________________________________________300.51.01.52.0

Página 4

_____________________Pin DescriptionMAX870/MAX871Switched-Capacitor Voltage Inverters4 _______________________________________________________________

Página 5

_______________Detailed DescriptionThe MAX870/MAX871 capacitive charge pumps invertthe voltage applied to their input. For highest perfor-mance, use l

Página 6

MAX870/MAX871Switched-Capacitor Voltage Inverters6 _______________________________________________________________________________________Conversion l

Página 7

MAX870/MAX871Switched-Capacitor Voltage Inverters_______________________________________________________________________________________ 7capacitors.

Página 8

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

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Rainbow-electronics MAX871 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX871. Rainbow Electronics MAX871 User Manual Manual do Utilizador

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