General Description

The MAX8667/MAX8668 dual step-down converters

with dual low-dropout (LDO) linear regulators are

intended to power low-voltage microprocessors or

DSPs in portable devices. They feature high efficiency

with small external component size. The step-down

converters are adjustable from 0.6V to 3.3V (MAX8668)

or factory preset (MAX8667) with guaranteed output

current of 600mA for OUT1 and 1200mA for OUT2. The

1.5MHz hysteretic-PWM control scheme allows for tiny

external components and reduces no-load operating

current to 100µA with all outputs enabled. Dual low-qui-

escent-current, low-noise LDOs operate down to 1.7V

supply voltage. The MAX8667/MAX8668 have individ-

ual enables for each output, maximizing flexibility.

The MAX8667/MAX8668 are available in the space-

saving, 3mm x 3mm, 16-pin thin QFN package.

Applications

Cell Phones/Smartphones

PDA and Palmtop Computers

Portable MP3 and DVD Players

Digital Cameras, Camcorders

PCMCIA Cards

Handheld Instruments

Features

o Tiny, Thin QFN 3mm x 3mm Package

o Individual Enables

o Step-Down Converters

600mA Guaranteed Output Current on OUT1

1200mA Guaranteed Output Current on OUT2

Tiny Size 2.2µH Chip Inductor (0805)

Output Voltage from 0.6V to 3.3V (MAX8668)

Ultra-Fast Line and Load Transients

Low 25µA Supply Current Each

o LDOs

300mA Guaranteed

Low 1.7V Minimum Supply Voltage

Low Output Noise

1.5MHz Dual Step-Down DC-DC Converters

with Dual LDOs and Individual Enables

________________________________________________________________

Maxim Integrated Products

1

15

16

14

13

5

6

7

8

13

OUT1 (FB1)

4

12

10

9

EN1

EN2

OUT2 (FB2)

REF

GND

EN4

MAX8667

MAX8668

2

11

PGND1

THIN QFN

(3mm x 3mm)

TOP VIEW

( ) ARE FOR THE MAX8668

Pin Configuration

IN34

LX2

LX1

OUT2

OUT1

2.6V TO 5.5V

OUT3

OUT4

REF

GND

IN12

300mA

300mA

EN1

EN2

EN3

EN4

600mA

1.2A

PGND1

PGND2

10

µF

4.7

µF

4.7

µF

4.7

µF

0.01

µF

2.2

µH

2.2

µH

2.2

µF

2.2

µF

MAX8667

Typical Operating Circuit

19-0784; Rev 1; 7/07

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 continued at the end of data sheet.

Selector Guide appears at the end of data sheet.

Ordering Information

Note: All MAX8667/MAX8668 parts are in a 16-pin, thin QFN,

3mm x 3mm package and operate in the -40°C to +85°C

extended temperature range.

+

Denotes a lead-free package.

PART

PKG CODE

TOP MARK

MAX8667ETEAA+

T1633-4

AEQ

MAX8667ETEAB+

T1633-4

AFI

MAX8667ETEAC+

T1633-4

AFM

MAX8667ETECQ+

T1633-4

AFN