Rainbow-electronics MAX8575 User Manual download pdf

General Description

The MAX8570 family of LCD step-up converters uses

an internal n-channel switch and an internal p-channel

output isolation switch. These converters operate from

a 2.7V to 5.5V supply voltage and deliver up to 28V at

the output.

A unique control scheme provides the highest efficien-

cy over a wide range of load conditions. The internal

MOSFET switch reduces external component count and

a high switching frequency (up to 800kHz) allows for

tiny surface-mount components. Three current-limit

options are available. The MAX8570 and MAX8572 use

a 110mA current limit to reduce ripple and component

size in low-current applications. For high-power require-

ments, the MAX8574 and MAX8575 use a 500mA cur-

rent limit and supply up to 20mA at 20V. The MAX8571

and MAX8573 use a 250mA current limit for a compro-

mise between ripple and power. Built-in safety features

protect the internal switch and down-stream compo-

nents from fault conditions.

Additional features include a low quiescent current and

a True Shutdown mode to save power. The MAX8570/

MAX8571/MAX8574 allow the user to set the output

voltage between 3V and 28V, and the MAX8572/

MAX8573/MAX8575 have a preset 15V output. These

step-up converters are ideal for small LCD panels with

low current requirements, but can also be used in other

applications. The MAX8571 evaluation kit is available to

help reduce design time.

Applications

LCD Bias Generators

Polymer LEDs (OLED)

Cellular or Cordless Phones

Palmtop Computers

Personal Digital Assistants (PDAs)

Organizers

Handy Terminals

Features

♦ 15V or Adjustable Output Voltage Up to 28V

♦ Safety Features Protect Against Output Faults

♦ 20mA at 20V from a Single Li+ Battery

♦ True Shutdown

♦ 87% Efficiency

♦ Up to 800kHz Switching Frequency

♦ Small 6-Pin SOT23 Package

MAX8570–MAX8575

High-Efficiency LCD Boost

with True Shutdown

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3329; Rev 0; 7/04

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.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX8570EUT-T*

-40°C to +85°C

6 SOT23-6

ABTJ

MAX8571EUT-T*

-40°C to +85°C

6 SOT23-6

ABTK

MAX8572EUT-T

-40°C to +85°C

6 SOT23-6

ABTL

MAX8573EUT-T

-40°C to +85°C

6 SOT23-6

ABTM

MAX8574EUT-T*

-40°C to +85°C

6 SOT23-6

ABTN

MAX8575EUT-T

-40°C to +85°C

6 SOT23-6

ABTO

GND

16V

5SW

MAX8570

MAX8571

MAX8574

SOT23-6

TOP VIEW

34SHDN

GND

16V

5SW

OUT

MAX8572

MAX8573

MAX8575

SOT23-6

34SHDN

Pin Configurations

PART

CURRENT LIMIT

OUTPUT VOLTAGE

MAX8570EUT 110mA Adjustable

MAX8571EUT 250mA Adjustable

MAX8572EUT 110mA 15V

MAX8573EUT 250mA 15V

MAX8574EUT 500mA Adjustable

MAX8575EUT 500mA 15V

Selector Guide

True Shutdown is a trademark of Maxim Integrated Products,

Inc.

MAX8572

MAX8573

MAX8575

OUT

GND

OFF

= 2.7V TO 5.5V

OUT

= V

TO 28V

SHDN

Typical Operating Circuit

*Future products—contact factory for availability.

1 2 3 4 5 6 7 8 9 10

Summary of Contents

Page 1 - High-Efficiency LCD Boost

General DescriptionThe MAX8570 family of LCD step-up converters usesan internal n-channel switch and an internal p-channeloutput isolation switch. The

Page 2

MAX8570–MAX8575High-Efficiency LCD Boost with True ShutdownMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely e

Page 3

MAX8570–MAX8575High-Efficiency LCD Boost with True Shutdown2 _______________________________________________________________________________________AB

Page 4

MAX8570–MAX8575High-Efficiency LCD Boost with True Shutdown_______________________________________________________________________________________ 3EF

Page 5

MAX8570–MAX8575High-Efficiency LCD Boost with True Shutdown4 _______________________________________________________________________________________EF

Page 6

MAX8570–MAX8575High-Efficiency LCD Boost with True Shutdown_______________________________________________________________________________________ 5PI

Page 7

MAX8570–MAX8575High-Efficiency LCD Boost with True Shutdown6 _______________________________________________________________________________________MA

Page 8

MAX8570–MAX8575High-Efficiency LCD Boost with True Shutdown_______________________________________________________________________________________ 7De

Page 9

MAX8570–MAX8575High-Efficiency LCD Boost with True Shutdown8 _______________________________________________________________________________________De

Page 10

MAX8570–MAX8575High-Efficiency LCD Boost with True Shutdown_______________________________________________________________________________________ 9Fo

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Rainbow-electronics MAX8575 User Manual

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