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| MAX6684 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – Fan-Failure Detector with Integrated Power Switch | |||
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19-2306; Rev 0; 1/02
Fan-Failure Detector with Integrated
Power Switch
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.
Features
o Dedicated Fan-Failure Detector
o Works with Ordinary 2-Wire Fans
o No Fan Tachometer Output Required
o No Software Development Required
o No Analog Circuit Design Required
o Logic-Level Fan Driver Control
o Works with Fans Rated Up to 24V/250mA
Desktop PCs
Notebooks
Networking Equipment
Telecommunications
Industrial Applications
Applications
PART
MAX6684ESA
Ordering Information
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
8 SO
Typical Operating Circuit
3.3V
VCC
OFF
MAX6684
FC+
FAIL
1µF 0.1µF
FC-
GND
SENSE
PGND
12V
10kâ¦
0.1µF
Pin Configuration
TOP VIEW
SENSE 1
FAIL 2
GND 3
FC- 4
MAX6684
8 PGND
7 OFF
6 VCC
5 FC+
SO
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maximâs website at www.maxim-ic.com.
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