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General Description

The MAX6684 is an integrated fan-failure detector that

detects when a fan exhibits excessive underspeed or a

locked rotor. This device is especially well suited for criti-

cal systems where no fan control, or simple on/off control

is desired. The MAX6684 detects fan failure by evaluat-

ing fluctuations in current at the low side of the fan; no

tachometer signal is necessary. The output of the device,

FAIL, is an active-low, open-drain alarm. The MAX6684

can also be used to switch the fan on or off, based on

the state of a logic-level input, OFF. This device can be

used with fans rated at up to 24V and 250mA. The

MAX6684 is available in an 8-pin SO package, and is

specified for operation from -40°C to +85°C.

Applications

Desktop PCs

Notebooks

Networking Equipment

Telecommunications

Industrial Applications

Features

♦ Dedicated Fan-Failure Detector

♦ Works with Ordinary 2-Wire Fans

♦ No Fan Tachometer Output Required

♦ No Software Development Required

♦ No Analog Circuit Design Required

♦ Logic-Level Fan Driver Control

♦ Works with Fans Rated Up to 24V/250mA

MAX6684

Fan-Failure Detector with Integrated

Power Switch

________________________________________________________________ Maxim Integrated Products 1

FC+FC-

PGND

OFFFAIL

GND

SENSE

TOP VIEW

MAX6684

Pin Configuration

Ordering Information

MAX6684

OFF

SENSE

12V

PGND

GND

FC+

10kΩ

FC-

3.3V

1µF

0.1µF

FAIL

Typical Operating Circuit

19-2306; Rev 0; 1/02

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

MAX6684ESA -40°C to +85°C 8 SO

1 2 3 4 5 6 7

Power Switch 1

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Página 1 - Power Switch

General DescriptionThe MAX6684 is an integrated fan-failure detector thatdetects when a fan exhibits excessive underspeed or alocked rotor. This devic

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MAX6684Fan-Failure Detector with Integrated Power Switch2 _______________________________________________________________________________________ABSOL

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MAX6684Fan-Failure Detector with Integrated Power Switch_______________________________________________________________________________________ 3RDSON

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MAX6684Detailed DescriptionThe MAX6684 detects fan failure in brushless DC fans.This device is especially well suited for critical systemswhere no fan

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Undercurrent (AC Component)Fan failure is signaled if the AC component of IFANisless than 35mAP-Pand remains out of specification forat least 1s (Figu

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MAX6684FAILOutputThe FAIL output is an active-low, open-drain alarm.Three fan-failure modes are possible (see the Fan-Failure Detection section).OFFDr

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MAX6684Fan-Failure Detector with Integrated Power SwitchMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embo

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Rainbow-electronics MAX6684 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX6684. Rainbow Electronics MAX6684 User Manual Manual do Utilizador

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