Datasheet > MAX1721

MAX1721

更新时间： 2024-11-20 14:57:35

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描述
SOT23封装、开关电容电压反相器，带有关断

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MAX1721 数据手册

19-1439; Rev 2; 4/04

SOT23, Switched-Capacitor

Voltage Inverters with Shutdown

General Description

Features

The ultra-small MAX1719/MAX1720/MAX1721 monolithic,

CMOS charge-pump inverters accept input voltages

ranging from +1.5V to +5.5V. The MAX1720 operates at

12kHz, and the MAX1719/MAX1721 operate at 125kHz.

High efficiency, small external components, and logic-

controlled shutdown make these devices ideal for both

battery-powered and board-level voltage conversion

applications.

♦ 1nA Logic-Controlled Shutdown

♦ 6-Pin SOT23 Package

♦ 99.9% Voltage Conversion Efficiency

♦ 50µA Quiescent Current (MAX1720)

♦ +1.5V to +5.5V Input Voltage Range

♦ 25mA Output Current

Oscillator control circuitry and four power MOSFET

switches are included on-chip. A typical MAX1719/

MAX1720/MAX1721 application is generating a -5V

supply from a +5V logic supply to power analog circuitry.

All three parts come in a 6-pin SOT23 package and can

deliver a continuous 25mA output current.

♦ Requires Only Two 1µF Capacitors

(MAX1719/MAX1721)

For pin-compatible SOT23 switched-capacitor voltage

inverters without shutdown (5-pin SOT23), see the

MAX828/MAX829 and MAX870/MAX871 data sheets. For

applications requiring more power, the MAX860/MAX861

Ordering Information

deliver up to 50mA. For regulated outputs (up to -2 x V ),

refer to the MAX868. The MAX860/MAX861 and MAX868

are available in space-saving µMAX packages.

PIN-

SOT

PART

TEMP RANGE

PACKAGE TOP MARK

MAX1719EUT -40°C to +85°C 6 SOT23-6

MAX1720EUT -40°C to +85°C 6 SOT23-6

MAX1721EUT -40°C to +85°C 6 SOT23-6

AACA

AABS

AABT

Applications

Local Negative Supply from a Positive Supply

Small LCD Panels

GaAs PA Bias Supply

Handy-Terminals, PDAs

Battery-Operated Equipment

Pin Configuration

Typical Operating Circuit

1µF

TOP VIEW

OUT

C1+

C1-

OUT

NEGATIVE

OUTPUT

INPUT

1.5V to 5.5V

-1 · V

MAX1719

MAX1720

MAX1721

SHDN (SHDN)

GND

25mA

MAX1721

1µF

C1-

SHDN

OFF

GND

SOT23-6

( ) ARE FOR MAX1719

________________________________________________________________ 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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