Rainbow-electronics MAX1692 Bedienungsanleitung PDF herunterladen

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.

General Description

The MAX1692 is a low-noise, pulse-width-modulated

(PWM), DC-DC step-down converter. It powers logic

and transmitters in small wireless systems such as cellu-

lar phones, communicating PDAs, and handy-terminals.

The device features an internal synchronous rectifier for

high efficiency; it requires no external Schottky diode.

Excellent noise characteristics and fixed-frequency

operation provide easy post-filtering. The MAX1692 is

ideally suited for Li-Ion battery applications. It is also

useful for +3V or +5V fixed input applications.

The device operates in one of four modes. Forced PWM

mode operates at a fixed frequency regardless of the

load. Synchronizable PWM mode allows an external

switching frequency to control and minimize harmonics.

Idle Mode™ (PWM/PFM) extends battery life by switch-

ing to a PFM pulse-skipping mode during light loads.

Shutdown mode places the device in standby, reduc-

ing quiescent supply current to under 0.1µA.

The MAX1692 can deliver over 600mA. The output volt-

age can be adjusted from 1.25V to V

with the input

range of +2.7V to +5.5V. Other features of the

MAX1692 include high efficiency, low dropout voltage,

and a 1.2%-accurate 1.25V reference. It is available in

a space-saving 10-pin µMAX package with a height of

only 1.11mm.

Applications

Cellular Phones CPU I/O Supplies

Cordless Phones Notebook Chipset Supplies

PDAs and Handy-Terminals Battery-Operated Devices

(1 Li-Ion or 3 NiMH/NiCd)

Features

♦ +2.7V to +5.5V Input Range

♦ Adjustable Output from 1.25V to V

♦ 600mA Guaranteed Output Current

♦ 95% Efficiency

♦ No Schottky Diode Required

♦ 85µA Quiescent Current

♦ 100% Duty Cycle in Dropout

♦ 750kHz Fixed-Frequency PWM Operation

♦ Synchronizable Switching Frequency

♦ Accurate Reference: 1.25V (±1.2%)

♦ Small 10-Pin µMAX Package

MAX1692

Low-Noise, 5.5V-Input,

PWM Step-Down Regulator

________________________________________________________________

Maxim Integrated Products

PGND

SHDN

SYNC/PWMREF

GND

MAX1692

TOP VIEW

LIMFB

µMAX

19-1400; Rev 0; 11/98

PART

MAX1692EUB -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

10 µMAX

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Idle Mode is a trademark of Maxim Integrated Products.

Pin Configuration

Ordering Information

Typical Operating Circuit

MAX1692

SYNC/PWM

PGND

LIM

SHDN

= 2.7V TO 5.5V V

OUT

= 1.25V TO V

AGND REF

1 2 3 4 5 6 ... 11 12

Inhaltsverzeichnis

Seite 1 - PWM Step-Down Regulator

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.General Descript

Seite 2

MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator10 ______________________________________________________________________________________Bypass C

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MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator______________________________________________________________________________________ 11Package

Seite 4

MAX1692Low-Noise, 5.5V-Input, PWM Step-Down RegulatorMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodie

Seite 5

MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator2 _______________________________________________________________________________________ABSOLUTE

Seite 6

MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator_______________________________________________________________________________________ 3Note 1:

Seite 7

1.741.761.801.781.821.840 400300200100 500 600 700 800 900OUTPUT VOLTAGE vs.LOAD CURRENTMAX1692-10LOAD CURRENT (mA)OUTPUT VOLTAGE (V)VIN = 2.7VVOUT =

Seite 8

MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator_______________________________________________________________________________________5600650700

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MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator6 _______________________________________________________________________________________NAME FUN

Seite 10

MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator_______________________________________________________________________________________ 7Detailed

Seite 11

MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator8 _______________________________________________________________________________________amounts

Seite 12

MAX1692Low-Noise, 5.5V-Input, PWM Step-Down Regulator_______________________________________________________________________________________ 9Capacito

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Rainbow-electronics MAX1692 Bedienungsanleitung

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Inhaltsverzeichnis

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