US79 datasheet(2/4 Pages) ETC

2 / 4 page

US79 Series

CMOS Power Hall IC

US79 CMOS Power Hall IC

Rev 3.0

23/Jan/01

Page 2

US79 Electrical Specifications

DC operating parameters: TA = 25 to 125oC, VDD = 5.0 to 12V unless otherwise specified.

Parameter

Test Conditions

Min Typ Max Units

Supply Voltage

VDD

Operating

3.7

Supply Current

IDD

Operating

1.2

2.0

Output leakage

ILEAK

B<BOP

µA

Output voltage

VOUT

B<BHYS

Output Saturation voltage

VDSS

IOUT = 150mA, VDD = 12V

400 600

Output Saturation voltage

VDSS

IOUT = 350mA, VDD =12V

800 1100

Output On resistance

RDDSS

VDD = 12V

1.34

Ω

Thermal resistance

Rth

Operating

200 °C/Watt

US79 Magnetic Specifications

DC operating parameters: TA = 25 to 125oC, VDD = 5.0 to 12V unless otherwise specified. 1 mT = 10 Gauss.

Parameter

Symbol Test Conditions

Min Typ Max Units

Operate Point

BOP

Operating

3.0

6.0

Release Point

BRP

Operating

-6.0 -3.0

Hysteresis

BHYS

Operating

6.0

General Description

The US79 eliminates 16 solder joints, protects

against

ESD,

filters

RFI

emission

caused

switching of high currents, protects against voltage

surges, protects against locked rotor, operates at a

low

temperature

and

manufactured

Automotive IC factory.

Unique Features

Reverse voltage protection eliminates the need for a

diode. Reverse current flows through the coils and

the chip. Power dissipation is (2 * Istall/start * 0.7V).

Table 1 presents max temperature for each current.

Table 1

Istall / Istart

TA Maximum Rev V Test

100mA

125°C

200mA

100°C

300mA

70°C

400mA

40°C

The IC tolerates >7000V ESD. When installed in the

fan, the windings increase the ESD tolerance to

>15000V eliminating the need for ESD concerns in

the finished fan. Reverse Voltage protection is

provided by the motor windings. The IC contains

slew rate control on the output drivers to eliminate

RF emissions. 35V Zener diodes clamp the output

drivers for overstress protection.

Application Comments

EMC protection is built in. EMC considerations

require that the fan assembly should tolerate ESD,

reverse voltage, over voltage and not radiate RF

noise which may interfere with other electronic

equipment. These capabilities are built in to the chip

to meet EMC requirements.

Qualification Test Results

SOA (Safe Operating Area) tests to verify inductive

switching of 500mA @ 20V. 1000 pieces tested 100

cycles each. Operating Life Test at TA = 150C for

4000 hrs. 100pc. “0” failures. Package qualified to

QS900 automotive PPAP specifications.

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