MAX6684ESA datasheet(2/7 Pages) MAXIM

2 / 7 page

Fan-Failure Detector with Integrated

Power Switch

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC = 3.0 to 5.5V, OFF = VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 3.3V, TA = +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Specifications to -40°C are guaranteed by design and not production tested.

Note 2: The MAX6684 is guaranteed to register a fault when the fan current fluctuates less than the minimum; it is guaranteed not to

Voltages Referenced to GND, Unless Otherwise Noted

VCC ........................................................................-0.3V to +6.0V

FC+, FC-.....................................................-0.3V to (VCC + 0.3V)

OFF, FAIL ..............................................................-0.3V to +6.0V

PGND ....................................................................-0.3V to +0.3V

SENSE to PGND ..................................................-0.3V to +28.0V

SENSE Current................................................................1400mA

Continuous Power Dissipation (TA = +70°C)

8-Pin SO (derate 5.9mW/°C above +70°C)..................470mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature ......................................................+150°C

Soldering Temperature (vapor phase, 60s).....................+215°C

Soldering Temperature (infrared, 15s).............................+220°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage

VCC

3.0

5.5

Supply Current

ICC

IFAN = 300mA

3.4

VCC Shutdown Supply Current

ISHDN

OFF = GND

µA

SENSE-to-PGND Output

Low Voltage

IFAN = 300mA

0.3

0.66

SENSE-to-PGND Output

On-Resistance

RDSON

2.2

Ω

SENSE Leakage Current

VSENSE = 26V

µA

VFAIL Output Low Voltage

IFAIL = 3mA

0.8

VFAIL Output Leakage Current

VFAIL = 5.5V

0.1

µA

Average SENSE (Fan) Current

300

SENSE Current Shutdown

VCC = 3V

600

1200

Thermal Shutdown of SENSE

15°C hysteresis

160

°C

Fan-Current Fluctuation

Frequency

No fault detected

400

VFAIL Output Delay After Fault

tFD

0.3

2.0

Minimum Fan-Current Fluctuation

Level (Note 2)

No fault detected

mAP-P

OFF Input High Voltage

VIH

0.7 x

VCC

OFF Input Low Voltage

VIL

0.3 x

VCC

OFF Input Current

-10

µA

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