AH285
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. 1.0 Sep 29, 2005
1/9

„ Features

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







„ Pin Configuration

1 : FG
2 : Vdd
3 : DO
4 : DOB
( Front View )
15432
285
5 : GND

„ General Description

AH285 is a monolithic fan motor controller with Hall
sensor’s capability. It contains two complementary
open-drain transistors as motor coil drivers,
automatic lock current shutdown, and recovery
protections. Additional, frequency generator (FG)
output is for speed detection 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
the rotor is blocked. Until the blocking is removed,
the motor recovers running normally.



„ Pin Descriptions

Symbol Description
FG Frequency generation
Vdd Input power
DO Output pin
DOB Output pin
GND Ground
SIP-5L
1
2
3 74
5
DOBDO
GND
FGVdd
SOT89-5L
285
1 32
5 4
SOT23-5
FG GND DO
DOB
Vdd
285


„ Ordering Information
AH285 X - X X X
Packing
Blank : Bulk
A : Tape & Reel
P: SIP-5L
Package Lead
L : Lead Free
Wafer Body
Blank or
A~Z : if necessary
to specify
Y: SOT89-5L
W: SOT23-5L
(for SOT Packages Only)