MAX6684ESA datasheet(3/7 Pages) MAXIM

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Fan-Failure Detector with Integrated

Power Switch

_______________________________________________________________________________________

RDSON vs. TEMPERATURE

TEMPERATURE (

°C)

-15

0.4

0.8

1.2

1.6

2.0

-40

VCC = 3V

ISENSE = 300mA

VCC = 5.5V

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (

°C)

-15

225

250

275

300

200

-40

VCC = 3V

NO LOAD

VCC = 5.5V

OVERCURRENT OPERATION

20ms/div

ISENSE

500mA/div

VFAIL

5V/div

VSENSE

2V/div

Typical Operating Characteristics

(VCC = 3.3V, TA = +25°C, unless otherwise noted.)

Pin Description

NAME

FUNCTION

SENSE

Positive Current-Sensing Terminal. Connect SENSE to low side of fan.

FAIL

Active-Low, Open-Drain Fan-Failure Output

GND

Ground

FC-

Connect to 0.1µF capacitor for most locked-rotor detection applications. To detect minimum speed,

select CF according to Minimum Speed and Locked-Rotor Detection.

FC+

Connect to 0.1µF capacitor for most locked-rotor detection applications. To detect minimum speed,

select CF according to Minimum Speed and Locked-Rotor Detection.

6VCC

Supply Voltage Input. Bypass VCC to GND with a 1µF capacitor.

OFF

Active-Low Fan-Control Input. Drive OFF high or leave floating to turn fan on. Drive OFF low to turn fan off.

PGND

Power Ground. Connect to GND.

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