Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

VBB Supply Current

–

2.5

5

mA

Standby mode, PWM = 0 V, SLEW = FC = O/C

–

25

50

μA

–

800

1200

mΩ

Overcurrent Threshold

180

200

220

mV

PWM Low Level

–

–

0.8

V

PWM High Level

2––

V

Input Hysteresis

–

300

600

mV

Logic Input Current

–25

–15

–5

μA

–70

–50

–20

μA

–30

–15

–5

μA

Output Saturation Voltage

I = 5 mA

–

–

0.3

V

FG Output Leakage

V = 16 V

–

–

1

μA

Protection Circuitry

Lock Protection

1.6

2

2.4

s

456

s

Thermal Shutdown Temperature

Temperature increasing

150

165

180

°C

Thermal Shutdown Hysteresis

–15–°C

VBB Undervoltage Lockout (UVLO)

–

4.3

4.7

V

*For the A4941GLPTR-T the electrical test is performed at 12 V only and characterized across the voltage range.

Three-Phase Sensorless Fan Driver

A4941

3

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com