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General Description

The MAX8506/MAX8507/MAX8508 integrate a PWM step-

down DC-DC regulator and a 75mΩ (typ) bypass FET to

power the PA in WCDMA and cdmaOne™ cell phones.

The supply voltage range is from 2.6V to 5.5V, and the

guaranteed output current is 600mA. One megahertz

PWM switching allows for small external components.

The MAX8506 and MAX8507 are dynamically controlled

to provide varying output voltages from 0.4V to 3.4V. The

MAX8508 is externally programmed for fixed 0.75V to

3.4V output. Digital logic enables a high-power (HP)

bypass mode that connects the output directly to the bat-

tery for all versions. The MAX8506/MAX8507/MAX8508

are designed so the output settles in less than 30µs for a

full-scale change in output voltage and load current.

The MAX8506/MAX8507/MAX8508 are offered in 16-pin

4mm x 4mm thin QFN packages (0.8mm max height).

Applications

WCDMA/NCDMA Cell Phones

Wireless PDAs, Palmtops, and Notebook

Computers

Wireless Modems

Features

♦ Integrated 75mΩ (typ) Bypass FET

♦ 38mV Dropout at 600mA Load

♦ Up to 94% Efficiency

♦ Dynamically Adjustable Output from 0.4V to 3.4V

(MAX8506, MAX8507)

♦ Externally Fixed Output from 0.75V to 3.4V

(MAX8508)

♦ 1MHz Fixed-Frequency PWM Switching

♦ 600mA Guaranteed Output Current

♦ Shutdown Mode 0.1µA (typ)

♦ 16-Pin Thin QFN (4mm x 4mm, 0.8mm max Height)

MAX8506/MAX8507/MAX8508

PWM Step-Down DC-DC Converters with 75m

Ω

Bypass FET for WCDMA and cdmaOne Handsets

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2918; Rev 1; 1/04

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.

PART TEMP RANGE PIN-PACKAGE

MAX8506ETE -40°C to +85°C 16 Thin QFN

MAX8507ETE -40°C to +85°C 16 Thin QFN

MAX8508ETE -40°C to +85°C 16 Thin QFN

cdmaOne is a trademark of CDMA Development Group.

Pin Configurations appear at end of data sheet.

Typical Application Circuits continued at end of data sheet.

CURRENT-

LIMIT

CONTROL

PWM

DAC

BATTP

OUT

COMP

PGND

GND

REFIN

1MHz

OSC

REF

INPUT

2.6V TO 5.5V

4.7µH

OUTPUT

0.4V TO 3.4V OR V

BATT

4.7µF

0.3Ω

0.4Ω

0.075Ω

BATT

REF

2.2µF

0.22µF

SKIP

SHDN

MAX8506

MAX8507

(kΩ)

1500

1000

(pF)

100

(pF)

MAX8506

MAX8507

Typical Application Circuits (MAX8506/MAX8507)

1 2 3 4 5 6 ... 10 11

MAX8506/MAX8507/MAX8508 1

Indice de contenidos

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General DescriptionThe MAX8506/MAX8507/MAX8508 integrate a PWM step-down DC-DC regulator and a 75mΩ (typ) bypass FET topower the PA in WCDMA and cdmaO

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MAX8506/MAX8507/MAX8508PWM Step-Down DC-DC Converters with 75mΩBypass FET for WCDMA and cdmaOne HandsetsMaxim cannot assume responsibility for use of

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MAX8506/MAX8507/MAX8508PWM Step-Down DC-DC Converters with 75mΩBypass FET for WCDMA and cdmaOne Handsets______________________________________________

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