US79 datasheet(3/9 Pages) MELEXIS

3 / 9 page

US79 Series

CMOS Power Hall IC

39010US79

Page 3 of 9

DataSheet

Rev. 006

Feb/04

3. Glossary of Terms

MilliTesla (mT), Gauss: Units of magnetic flux density; 1 milliTesla = 10 Gauss.

Two-Coil Fan: a fan with two coil windings, current alternates from 1 coil to the other depending on the

polarity of the magnetic field.

Two-wire Fan: A fan that has only two connections for the power supply plus and minus.

Locked rotor: The condition of a fan that has stopped spinning due to mechanical blockage .

4. Absolute Maximum Ratings

Supply Voltage, VDD

(-0.3 to 18)V

Output Current (Fault), IOUT

500mA

Operating Temperature Range, TA

-40 to 125°C

Storage Temperature Range, TS

-55 to 165°C

Maximun Junction Temp, TJ

150°C

Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-

maximum-rated conditions for extended periods may affect device reliability.

5. US79 Electrical Specifications

DC operating parameters: TA = 25

oC, VDD = 12V unless otherwise specified

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Supply Voltage

VDD

Operating

3.5

Supply Current

IDD

Operating

2.0

Output Saturation voltage

VDSS

IOUT = 150mA

300

600

Output Saturation voltage

VDSS

IOUT = 350mA

650

1100

Thermal resistance

Rth

Operating

190

oC/W

Locked-Rotor Period

ton

0.8

Locked-Rotor period

toff

6. US79 Magnetic Specifications

DC operating parameters: TA = 25 oC, VDD = 12V unless otherwise specified.

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Operate Point

BOP

Operating

2.5

6.0

Release Point

BRP

Operating

-6.0

-2.5

Hysteresis

BHYS

Operating

2.0

5.0

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