MAX685EEET Maxim Integrated Products, MAX685EEET Datasheet

MAX685EEET

Manufacturer Part Number

MAX685EEET

Description

SSOP16

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX685EEET.pdf (11 pages)

Specifications of MAX685EEET

Date_code

08+

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The MAX685 DC-DC converter provides low-noise dual

outputs for powering CCD imaging devices and LCDs.

This device uses a single inductor to provide indepen-

dently regulated positive and negative outputs.

Integrated power switches are included in a small 24-

Pin 4mm x 4mm Thin QFN package to save space and

reduce cost. A 16-pin QSOP package is also available.

Each output delivers up to 10mA from a +2.7V to +5.5V

input voltage range. Output voltages are set indepen-

dently up to 24V and down to -9V. With a few additional

low-cost components, the output voltages can be set at

up to 45V and down to -16V. Output ripple magnitude is

30mVp-p. The MAX685 uses a fixed-frequency, pulse-

width-modulated (PWM) control scheme at 220kHz or

400kHz to permit output noise filtering and to reduce

the size of external components. The frequency can

also be synchronized to an external clock signal

between 200kHz and 480kHz.

The MAX685 has a power-OK indicator output (POK)

that signals when both outputs are within regulation. A

logic-controlled shutdown completely turns off both out-

puts and reduces supply current to 0.1µA. The user

can also set which output turns on first.

The preassembled MAX685 evaluation kit is available to

reduce design time.

19-1353; Rev 1; 6/03

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.

TOP VIEW

Camcorders

Digital Cameras

Notebooks

SHDN

N.C.

POK

SEQ

________________________________________________________________ Maxim Integrated Products

24-TQFN (4mm x 4mm)

General Description

MAX685

Dual-Output (Positive and Negative),

Pin Configuration

LCDs

CCD Imaging Devices

DC-DC Converter for CCD and LCD

Applications

N.C.

PGND

FBP

REF

o Dual Output Using a Single Inductor

o Low-Noise Output, 30mVp-p Ripple

o Output Voltages up to 24V and down to -9V

o Internal Switches in a Small 24-Pin 4mm x 4mm

o 220kHz/400kHz Fixed-Frequency PWM Operation

o Frequency Can Be Synchronized to External

o Power-OK Indicator

o Selectable Power-On Sequencing

o 0.1µA Logic-Controlled Shutdown

MAX685EEE

MAX685ETG

(up to 45V and down to -16V with added

components)

Thin QFN Package

Clock

POS

OPTIONAL

POWER-OK

INDICATOR

PART

INPUT

2.7V TO 5.5V

OFF

NEG

Typical Operating Circuit

SHDN

SYNC

SEQ

POK

-40°C to +85°C

TEMP RANGE

MAX685

Ordering Information

GND

LXN

FBN

FBP

LXP

REF

16 QSOP

24 TQFN

PIN-PACKAGE

Features

POSITIVE

OUTPUT

UP TO 24V,

10mA

NEGATIVE

OUTPUT

DOWN TO -9V,

10mA

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