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TC646E/OA

PWM Fan Speed Controller with Auto-Shutdown and FanSense™ Technology

Microchip Technology 

TC646

1.0 ELECTRICAL

CHARACTERISTICS

Absolute Maximum Ratings*

Supply Voltage ......................................................... 6V

Input Voltage, Any Pin..... (GND – 0.3V) to (VDD+0.3V)

Package Thermal Resistance:

PDIP (RθJA)............................................. 125°C/W

SOIC (RθJA) ............................................ 155°C/W

MSOP (RθJA) .......................................... 200°C/W

Specified Temperature Range ........... -40°C to +125°C

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

*Stresses above those listed under "Absolute Maximum Rat-

ings" may cause permanent damage to the device. These are

stress ratings only and functional operation of the device at

these or any other conditions above those indicated in the

operation sections of the specifications is not implied. Expo-

sure to absolute maximum rating conditions for extended peri-

ods may affect device reliability.

DC ELECTRICAL SPECIFICATIONS

Electrical Characteristics: Unless otherwise specified, TMIN ≤ TA ≤ TMAX, VDD = 3.0V to 5.5V

Symbol

Parameter

Min

Typ

Max

Units

Test Conditions

VDD

Supply Voltage

3.0

IDD

Supply Current, Operating

—

IDD(SHDN)

Supply Current, Shutdown/

—

Auto-shutdown Mode

IIN

VIN, VAS Input Leakage

-1.0

VOUT Output

tR

VOUT Rise Time

—

tF

VOUT Fall Time

—

tSHDN

Pulse Width(On VIN) to Clear

30

Fault Mode

IOL

Sink Current at VOUT Output

1.0

IOH

Source Current at VOUT

5.0

Output

—

5.5

V

0.5

1.0

mA Pins 6, 7 Open,

CF = 1 µF, VIN = VC(MAX)

25

—

µA Pins 6, 7 Open;

Note 1

CF =1 µF, VIN = 0.35V

—

+1.0

µA Note 1

—

50

µsec IOH = 5 mA, Note 1

—

50

µsec IOL = 1 mA, Note 1

—

—

µsec VSHDN, VHYST

Specifications,

Note 1

—

—

mA VOL = 10% of VDD

—

—

mA VOH = 80% of VDD

SENSE Input

VTH(SENSE) SENSE Input Threshold

50

Voltage with Respect to GND

70

90

mV Note 1

FAULT Output

VOL

Output Low Voltage

—

tMP

Missing Pulse Detector Timer

—

tSTARTUP

Start-up Timer

—

tDIAG

Diagnostic Timer

—

Note 1: Ensured by design, not tested.

—

32/F

32/F

3/F

0.3

V IOL = 2.5 mA

—

Sec CF = 1.0 µF

—

Sec CF = 1.0 µF

—

Sec CF = 1.0 µF

 2002 Microchip Technology Inc.

DS21446C-page 3

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