AH291

Low Voltage Hall-Effect Smart Fan Motor Controller

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of

this product. No rights under any patent accompany the sale of the product.

Rev. 0.6 Jan 27, 2005

1/9

Features

- On chip Hall sensor

- Rotor-locked shutdown

- Automatically restart

- Built-in Zener protection for output driver

- Operating voltage: 1.8V~5.75 V

- Output current:

)

AVE

(

O

I

= 400 mA

- Package: SIP-4L, SOT23-5L, SOT89-5L

General Description

AH291 is a monolithic fan motor controller with Hall

sensor’s capability. It contains two complementary

open-collector drivers for motor’s coil driving,

automatic lock shutdown and restart function

relatively.

To avoid coil burning, rotor-lock shutdown detection

circuit shut down the output driver if the rotor is

blocked and then the automatic recovery circuit will

try to restart the motor. These protecting actions are

repeated and periodic during the blocked period.

Until the blocking is removed, the motor recovers

running normally.

Pin Assignment

291

12

4

3

1 : VCC

2 : DO

3 : DOB

4 : GND

Front View

SIP-4L

1

3

2

5

4

SOT23-5

VCC GND

DO

DOB

NC

291

1

2

3

74

5

DOB

DO

GND

NC

VCC

SOT89-5L

AH291

Pin Descriptions

Name

Description

VCC

Input power

DO

Output pin

DOB

Output pin

GND

Ground

NC

Not connected

Ordering Information

AH291 X -X X X

Packing

Blank : Tube or Bulk

A : Tape & Reel

P: SIP-4L

Package

Lead

L : Lead Free

Blank: Normal

Wafer Body

Blank or

A~Z : if necessary

to specify

Y: SOT89-5L

W: SOT23-5L