MAX8640Z Maxim Integrated Products, MAX8640Z Datasheet

MAX8640Z

Manufacturer Part Number

MAX8640Z

Description

4MHz/2MHz Synchronous Step-Down DC-DC Converters

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX8640Z.pdf (12 pages)

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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 28µA.

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 (2.0mm x 2.1mm) and µDFN (1.5mm x

1.0mm) packages. Both packages are lead-free.

19-3997; Rev 4; 2/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim's website at www.maxim-ic.com.

2.7V TO 5.5V

INPUT

2.2μF

ON/OFF

Microprocessor/DSP Core Power

I/O Power

Cell Phones, PDAs, DSCs, MP3s

Other Handhelds Where Space Is Limited

Typical Operating Circuit

GND

SHDN

________________________________________________________________ Maxim Integrated Products

MAX8640Y

MAX8640Z

General Description

Tiny 500mA, 4MHz/2MHz Synchronous

OUT

1μH OR 2.2μH

Applications

2.2μF OR

4.7μF

Step-Down DC-DC Converters

UP TO 500mA

0.8V TO 2.5V

OUTPUT

♦ Tiny SC70 and µDFN Packages

♦ 500mA Guaranteed Output Current

♦ 4MHz or 2MHz PWM Switching Frequency

♦ Tiny External Components: 1µH/2.2µF or

♦ 28µA 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

* Contact factory for availability of each version. For 2.85V output

(82 version), request application note that includes limitations

and typical operating characteristics.

+ Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

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

operating temperature range.

Ordering Information continued and Selector Guide appears

at end of data sheet.

MAX8640YEXT08+T

2.2µH/4.7µF

MAX8640YEXT10+T

MAX8640YEXT11+T

MAX8640YEXT12+T

MAX8640YEXT13+T

MAX8640YEXT15+T

MAX8640YEXT16+T

MAX8640YEXT18+T

MAX8640YEXT19+T

MAX8640YEXT82+T

GND

OUT

2.0mm x 2.1mm

PART*

MAX8640Y

MAX8640Z

SC70

GND

SHDN

Ordering Information

TOP VIEW

PIN-

PACKAGE

6 SC70

Pin Configurations

GND

OUT

1.5mm x 1.0mm

MAX8640Y

MAX8640Z

μDFN

Features

TOP MARK

ACQ

ACG

ADD

ACH

ACR

ACS

ADB

ADF

ADJ

ACI

SHDN

GND

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