US168 / US169

Low Noise & Low voltage

Single-Coil Fan/Motor Driver

390109027901

Page 3 of 13

Data Sheet

Rev 001

July/06

3 Glossary of Terms

Gauss, milliTesla (mT),

Units of magnetic flux density :

10 Gauss = 1mT

Single-coil motor

DC motor with only one coil driven by a Full-Bridge.

Full-Bridge (H-Bridge)

Two push-pull output drivers that can source or sink current.

Peak output current

The current flowing in the coil at start-up, only limited by the coil resistance

Continuous output current

Average absolute value of the output current when the fan is spinning

Locked rotor

The state when the fan is not spinning due to mechanical blockage.

FG

Frequency Generator

RD

Rotation Detection

4 Absolute Maximum Ratings

Parameter

Symbol

Value

Units

Supply Voltage

-7 to 7

V

Voltage on FG (RD) pin

-6 to 7

V

Peak Output Current

500

mA

Multi-layer (1S2P) PCB

350

mA

Continuous Output Current

Single-layer (1S0P) PCB

300

mA

Operating Temperature Range

-40 to 85

°C

Junction Temperature

125

°C

Storage Temperature Range

-50 to 150

°C

Magnetic Flux Density

B

Unlimited

mT

-

1500

V

-

5000

V

Table 1: Absolute maximum ratings

Note 1: Human Body Model according JESD22-A114 standard – 100pF capacitor discharged through 1.5kΩ resistor into each pin.

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

rated conditions for extended periods may affect device reliability.

5 Pin Definitions and Descriptions

Pin Number

Pin Name

Function

1

OUT1

Coil Driver 1

2

GND

Ground pin

3

VDD

Power Supply pin

4

FG (RD)

Tachometer (Alarm) open drain output

5

OUT2

Coil Driver 2

Table 2: Pin description US168 (US169)