Rainbow-electronics MAX1721 Bedienungsanleitung PDF herunterladen

General Description

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.

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.

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

deliver up to 50mA. For regulated outputs (up to -2 · V

refer to the MAX868. The MAX860/MAX861 and MAX868

are available in space-saving µMAX packages.

Applications

Local Negative Supply from a Positive Supply

Small LCD Panels

GaAs PA Bias Supply

Handy-Terminals, PDAs

Battery-Operated Equipment

Features

♦ 1nA Logic-Controlled Shutdown

♦ 6-Pin SOT23 Package

♦ 99.9% Voltage Conversion Efficiency

♦ 50µA Quiescent Current (MAX1719/MAX1720)

♦ +1.5V to +5.5V Input Voltage Range

♦ 25mA Output Current

♦ Requires Only Two 1µF Capacitors

(MAX1719/MAX1721)

MAX1719/MAX1720/MAX1721

SOT23, Switched-Capacitor

Voltage Inverters with Shutdown

________________________________________________________________

Maxim Integrated Products

TOP VIEW

GND

C1-

C1+

OUT

( ) ARE FOR MAX1719

SOT23-6

SHDN (SHDN)

MAX1719

MAX1720

MAX1721

Pin Configuration

C1+ C1-

SHDN

OUT

GND

1µF

OFF

INPUT

1.5V to 5.5V

NEGATIVE

OUTPUT

-1 · V

25mA

MAX1721

Typical Operating Circuit

19-1439; Rev 1; 5/99

PART

MAX1719EUT

-40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

6 SOT23-6

Ordering Information

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

For small orders, phone 1-800-835-8769.

SOT

TOP MARK

AACA

MAX1721EUT

-40°C to +85°C 6 SOT23-6 AABT

MAX1720EUT

-40°C to +85°C 6 SOT23-6 AABS

1 2 3 4 5 6 7 8

Inhaltsverzeichnis

Seite 1 - SOT23, Switched-Capacitor

General DescriptionThe ultra-small MAX1719/MAX1720/MAX1721 monolithic,CMOS charge-pump inverters accept input voltagesranging from +1.5V to +5.5V. The

Seite 2

MAX1719/MAX1720/MAX1721SOT23, Switched-CapacitorVoltage Inverters with Shutdown2 _____________________________________________________________________

Seite 3

MAX1719/MAX1720/MAX1721SOT23, Switched-CapacitorVoltage Inverters with Shutdown_______________________________________________________________________

Seite 4

0150100502002503003504004505000105 15202530MAX1720 OUTPUT VOLTAGE RIPPLE vs. CAPACITANCEMAX1720/21toc12CAPACITANCE (µF)OUTPUT VOLTAGE RIPPLE (mVp-p)VI

Seite 5

Detailed DescriptionThe MAX1719/MAX1720/MAX1721 capacitive chargepumps invert the voltage applied to their input. For high-est performance, use low eq

Seite 6

MAX1719/MAX1720/MAX1721SOT23, Switched-CapacitorVoltage Inverters with Shutdown6 _____________________________________________________________________

Seite 7

MAX1719/MAX1720/MAX1721SOT23, Switched-CapacitorVoltage Inverters with Shutdown_______________________________________________________________________

Seite 8

MAX1719/MAX1720/MAX1721SOT23, Switched-CapacitorVoltage Inverters with ShutdownMaxim cannot assume responsibility for use of any circuitry other than

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Rainbow-electronics MAX1721 Bedienungsanleitung

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