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General Description

The MAX8640Y/MAX8640Z step-down converters are

optimized for applications where small size, high effi-

ciency, and low output ripple are priorities. They utilize

a proprietary PWM control scheme that optimizes the

switching frequency for high efficiency with small exter-

nal components and maintains low output ripple volt-

age at all loads. The MAX8640Z switches at up to

4MHz to allow a tiny 1µH inductor and 2.2µF output

capacitor. The MAX8640Y switches at up to 2MHz for

higher efficiency while still allowing small 2.2µH and

4.7µF components. Output current is guaranteed up to

500mA, while typical quiescent current is 24µA.

Factory-preset output voltages from 0.8V to 2.5V elimi-

nate external feedback components.

Internal synchronous rectification greatly improves effi-

ciency and replaces the external Schottky diode

required in conventional step-down converters. Internal

fast soft-start eliminates inrush current so as to reduce

input capacitor requirements.

The MAX8640Y/MAX8640Z are available in the tiny 6-

pin, SC70 lead-free package (2.0mm x 2.1mm footprint,

1.1mm max height).

Applications

Microprocessor/DSP Core Power

I/O Power

Cell Phones, PDAs, DSCs, MP3s

Other Handhelds Where Space Is Limited

Features

♦ Tiny 6-Pin SC70 Package

♦ 500mA Guaranteed Output Current

♦ 4MHz or 2MHz PWM Switching Frequency

♦ Tiny External Components: 1µH/2.2µF or

2.2µH/4.7µF

♦ 24µA Quiescent Current

♦ Factory Preset Outputs from 0.8V to 2.5V

♦ ±1% Initial Accuracy

♦ Low Output Ripple at All Loads

♦ Ultrasonic Skip Mode Down to 1mA Loads

♦ Ultra-Fast Line- and Load-Transient Response

♦ Fast Soft-Start Eliminates Inrush Current

MAX8640Y/MAX8640Z

500mA, 4MHz/2MHz Synchronous

Step-Down DC-DC Converters in SC70

________________________________________________________________ Maxim Integrated Products 1

19-3997; Rev 0; 5/06

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

Ordering Information

PART*

PIN-

PACKAGE

PKG

CODE

TOP

MARK

MAX8640YEXT08+T 6 SC70-6 X6S-1

ACQ

MAX8640YEXT11+T 6 SC70-6 X6S-1

ACR

MAX8640YEXT12+T 6 SC70-6 X6S-1

ACS

MAX8640YEXT13+T 6 SC70-6 X6S-1

ACG

MAX8640YEXT15+T 6 SC70-6 X6S-1

ADD

MAX8640YEXT16+T 6 SC70-6 X6S-1

ADB

MAX8640YEXT18+T 6 SC70-6 X6S-1

ACI

MAX8640YEXT19+T 6 SC70-6 X6S-1

ACH

MAX8640YEXT25+T 6 SC70-6 X6S-1

ACJ

GND

OUT

6IN

5 GND

MAX8640Y

MAX8640Z

SC70

TOP VIEW

SHDN

Pin Configuration

1μH OR 2.2μH

2.2μF OR

4.7μF

2.2μF

OUT

GND

SHDN

ON/OFF

MAX8640Y

MAX8640Z

INPUT

2.7V TO 4.9V

OUTPUT

0.8V TO 2.5V

UP TO 500mA

Typical Operating Circuit

Ordering Information continued and Selector Guide appears

at end of data sheet.

*Contact factory for availability of each version.

+Denotes lead-free package.

Note: All devices are specified over the -40°C to +85°C

operating temperature range.

1 2 3 4 5 6 7 8 9

Resumo do Conteúdo

Página 1 - 500mA, 4MHz/2MHz Synchronous

General DescriptionThe MAX8640Y/MAX8640Z step-down converters areoptimized for applications where small size, high effi-ciency, and low output ripple

Página 2

MAX8640Y/MAX8640Z500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters in SC702 ____________________________________________________________________

Página 3

MAX8640Y/MAX8640Z500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters in SC70______________________________________________________________________

Página 4

MAX8640Y/MAX8640Z500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters in SC704 ____________________________________________________________________

Página 5

MAX8640Y/MAX8640Z500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters in SC70______________________________________________________________________

Página 6

Soft-StartThe MAX8640Y/MAX8640Z include internal soft-startcircuitry that eliminates inrush current at startup, reduc-ing transients on the input sour

Página 7

MAX8640Y/MAX8640Z500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters in SC70______________________________________________________________________

Página 8

MAX8640Y/MAX8640Z500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters in SC708 ____________________________________________________________________

Página 9

MAX8640Y/MAX8640Z500mA, 4MHz/2MHz Synchronous Step-Down DC-DC Converters in SC70Maxim cannot assume responsibility for use of any circuitry other than

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Rainbow-electronics MAX8640Z Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX8640Z. Rainbow Electronics MAX8640Z User Manual Manual do Utilizador

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