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

(-0.3 to 18)V

500mA

-40 to 125°C

-55 to 165°C

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

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Supply Voltage

Operating

3.5

-

18

V

Supply Current

Operating

2.0

4

mA

Output Saturation voltage

300

600

mV

Output Saturation voltage

650

1100

mV

Thermal resistance

Operating

190

Locked-Rotor Period

0.8

S

Locked-Rotor period

5

S

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Operate Point

Operating

2.5

6.0

mT

Release Point

Operating

-6.0

-2.5

mT

Hysteresis

Operating

2.0

5.0

-

mT