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Features AH286


HALL-EFFECT SMART FAN MOTOR CONTROLLER


AH286 Rev. 8




1 of 7

JULY 2008


www.diodes.com

©
Diodes Incorporated





AH286 is a monolithic fan motor controller with Hall sensors
capability. It contains two complementary open-drain transistors
for motors coil driving, automatic lock current shutdown, and
recovery protections. In addition, rotor-state detection (RD)
output is for Rotor-state detection.

On chip Hall sensor

Rotor-locked shutdown

Automatically restart

Rotor-state detection (RD) output

Built-in Zener protection for output driver

Operating voltage: 3.8V~20 V
Rotor-lock shutdown detection circuit turns off the output driver
when the rotor is blocked to avoid coil overheat. Then, the
automatic recovery circuit will restart the motor. These protected
actions are repeated and periodic during the blocked period. Until
the blocking is removed, the motor recovers and runs normally.


Output current: I
O(AVE)
= 500mA for SOT89-5L

Lead Free Package: SOT89-5L

Lead Free Finish/RoHS Compliant (Note 1)




Ordering Information


AH286 - Y L - 13
Packing
Package
Lead Free
L : Lead Free
Y : SOT89-5L
13 : Tape & Reel




13 Tape and Reel
Device
Package
Code
Packaging
(Note 2)
Quantity
Part Number Suffix
AH286-YL-13
Y
SOT89-5L
2500/Tape & Reel
-13
Features

General Description

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied, see EU Directive 2002/95/EC Annex Notes.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.


Pin Assignment


1
2
3
74
5
DOB
DO
GND
RD
Vdd
SOT89-5L
286
( Top View )


AH286


HALL-EFFECT SMART FAN MOTOR CONTROLLER


AH286 Rev. 8




2 of 7

JULY 2008


www.diodes.com

©
Diodes Incorporated


Pin Descriptions


Symbol
Description
RD
Rotor-state detection
Vdd Input
power
DO Output
pin
DOB Output
pin
GND Ground


Block Diagram


Hall
Plate
Control Logic
Regulator
Lock Shutdown
and
Automatic Recovery
Vdd
GND
DOB
DO
Amp.
1
3
4
2
5
RD






AH286


HALL-EFFECT SMART FAN MOTOR CONTROLLER


AH286 Rev. 8




3 of 7

JULY 2008


www.diodes.com

©
Diodes Incorporated

Typical Application Circuit



286
1
3
2
Vdd (12V)
Coil2
Coil1
R
pu
RD
D2
D1
C3
5
4
GND
D3
R1
C1
R2
C2
Notes: R1, R2: typical 56 Ohm.
C1, C2, C3: typical 2.2µF, E-Cap. is recommended.
The R, C value need to be fine tuned based on coils design.
D3 is a Zener diode, not to exceed the absolute maximum
rating voltage.



12V DC Brush-Less Fan with RD Output Function

Absolute Maximum Ratings
(T
A
= 25
°
C)

Symbol
Characteristics
Rating
Unit
V
dd
Supply
Voltage
24
V
SOT89-5L 500
I
O (AVE)

I
O (PEAK)

Output Current
I
O (PEAK)

700
mA
P
D
Power
Dissipation
SOT89-5L 800
mW
T
OP

Operating Temperature
-40 ~ 100
°
C
T
ST

Storage Temperature
-55 ~ 150
°
C
T
J

Maximum Junction Temperature
150
°
C JA
(Note 3)
Thermal Resistance Junction-to-Case
SOT89-5L
156
°
C/W

T
J
T
A
Tc
JC JA

Notes: 3.
JA
should be confirmed with what heat sink thermal resistance. If no heat sink contacting, JA

is almost the same as JC.
. AH286


HALL-EFFECT SMART FAN MOTOR CONTROLLER


AH286 Rev. 8




4 of 7

JULY 2008


www.diodes.com

©
Diodes Incorporated

Electrical Characteristics
(T
A
= 25
°
C, Vdd

=12V, unless otherwise specified)


Symbol
Characteristics
Conditions
Min
Typ.
Max
Unit
Vdd
Supply Voltage
Operating
3.8
-
20
V
Idd Supply
current
Operating -
2.0
4.0
mA
Ioff
Output Leakage Current
V
OUT
=24V -
<
0.1
10 A
Tlrp-on

Locked Protection On

0.4
0.5
0.6
Sec
Tlrp-off

Locked Protection Off

2.4
3
3.6
Sec
)
sat
(
OUT
V

I
O
=300mA -
375
500

Output saturation voltage
I
O
=500mA -
625
900
mV
Rds(on)
Output On resistance
I
O
=300mA -
1.25
1.67
ohm
Vol
RD output Vds
I
O
=10mA
-
0.5
-
V
Vz Output
Zener-breakdown
Voltage

35
42
60
V

Truth Table
IN-
IN+
CT
OUT1
OUT2
RD
Mode
H L L H L L
Rotating
L H L L H L
Rotating
- - H off off H Lockup
protection
activated


Magnetic Characteristics
(T
A
= 25
°
C, V
dd
= 12V, unless otherwise specified)



(1mT=10 Gauss)

Symbol
Characteristics
Min.
Typ.
Max.
Unit
Bop Operate
Point
10
30
60
Gauss
Brp Release
Point
-60
-30
-10
Gauss
Bhy Hysteresis
--
60
--
Gauss













AH286


HALL-EFFECT SMART FAN MOTOR CONTROLLER


AH286 Rev. 8




5 of 7

JULY 2008


www.diodes.com

©
Diodes Incorporated

Operating Characteristics




DOB DO
12
10
8
6
4
2
OFF
OP
RP
ON
Ou
t
put
V
o
lt
ag
e in V
o
lt
s
12
10
8
6
4
2
OFF
RP
OP
ON
O
u
tp
u
t Vo
l
ta
g
e
in

Vo
lts
Bop
Brp
0
Bop
Brp
0
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
Vsat
Vsat



Marking
side
S
( SOT89-5L )
N














AH286


HALL-EFFECT SMART FAN MOTOR CONTROLLER


AH286 Rev. 8




6 of 7

JULY 2008


www.diodes.com

©
Diodes Incorporated

Performance Characteristics


(1) SOT89-5L

T
A
(
°
C)
25
50
60
70
75
80
85
90
95
100
P
D
(mW)
800 640 576 512 480 448 416 384 352 320
T
A
(
°
C)
105
110
115
120
125
130
135
140
145
150
P
D
(mW)
288 256 224 192 160 128 96 64 32 0


Power Dissipation Curve
0
100
200
300
400
500
600
700
800
900
0
25
50
75
100
125
150
T
A
(°C)
P
D
(mW)



Marking Information


(1) SOT89-5L


1
2
3
5
7
4
286 Y M X
Y : Year : 0~9
X : Internal code a~z : Lead Free
( Top View )
M : Month: A~L




AH286


HALL-EFFECT SMART FAN MOTOR CONTROLLER


AH286 Rev. 8




7 of 7

JULY 2008