AH284
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. 0.5 Jan 17, 2005
1/9

„ Features

- On chip Hall sensor
- Rotor-locked shutdown
- Automatically restart
- Built-in Zener protection for output driver
- Operating voltage: 3.8V~20 V
- Output current: I
O(AVE)
= 500mA for SIP-4/SOT89-5
- Output current: I
O(AVE)
= 400mA for SOT23-5
- Package: SIP-4L, SOT23-5L, SOT89-5L





„ Pin Assignment

284
12 43
1 : VCC
2 : DO
3 : DOB
4 : GND
Front View
SIP-4L

1
2
3 74
5
DOBDO
GND
NCVCC
SOT89-5L
284
1 32
5 4
SOT23-5
NC GND DO
DOB
VCC
284


„ General Description

AH284 is a monolithic fan motor controller with Hall
sensor’s capability. It contains two complementary
open-drain 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. This function repeats while
rotor is blocked. Until the blocking is removed, the
motor recovers running normally.


„ Pin Descriptions

Name Description
VCC Input power
DO Output pin
DOB Output pin
GND Ground
NC Not connected





„ Ordering Information

AH284 X -XX X
Packing
Blank : Tube or Bulk
A : Tape & Reel
P: SIP-4L
W:SOT23-5L
Y: SOT89-5L
Package Lead
L : Lead Free
Blank: Normal
Wafer Body
Blank or
A~Z : if necessary
to specify