AH281
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. 0.7 Apr 16, 2004
1/7
Features
- On chip Hall sensor
- Rotor-locked shutdown
- Automatically restart
- Built-in Zener protection for output driver
- Operating voltage: 10V~20 V, driver start up: 8V
(minimum)
- Output current:
)
AVE
(
O
I
= 300 mA
- Package: SIP-4L, SOT89-5L
Pin Assignment
281
1 2
4
3
1 : VCC
2 : DO
3 : DOB
4 : GND
Front View
SIP-4L
General Description
AH281 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. 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
1
2
3
74
5
DOB
DO
GND
NC
VCC
SOT89-5L
AH281
Ordering Information
AH281 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
AH281
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 0.7 Apr 16, 2004
2/7
Block Diagram (SIP4)
Hall
Plate
Control Logic
Regulator
Lock shutdown
and
Automatic recovery
VCC
DOB
DO
Amp.
1
2
3
4
GND
Application Circuit
VCC
DOB
DO
GND
12V
D1
L2
L1
281
C1 =10uF
+
1
2
3
4
12V brush-less DC fan
AH281
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 0.7 Apr 16, 2004
3/7
Absolute Maximum Ratings
(Ta = 25
C)
Characteristics
Symbol
Rating
Unit
Output Zener-breakdown Voltage
Vz
38
V
Operating Supply Voltage
V
CC
28
V
I
O(AVE)
300
Output Current
I
O(PEAK)
400
mA
SIP4 550
Power Dissipation
P
D
SOT89-5 800
mW
Operating Temperature
Topr
-20 ~ 100
C
Storage Temperature
Tstg
-55 ~ 150
C
Maximum Junction Temp.
Tj
150
C
Electrical Characteristics
(
Ta = 25
C, V
CC
=12V, unless otherwise specified)
Characteristics
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply Voltage
Vcc
Operating
10
20
V
Supply current
cc
I
Operating -
2.0
4.0
mA
Locked Protection On
Tlrp-on
0.4 Sec
Locked Protection Off
Tlrp-off
2.4 Sec
I
O
=150mA -
375
Output saturation voltage
)
sat
(
OUT
V
I
O
=250mA -
625
mV
Output On resistance
Rds(on)
2.6
ohm
Magnetic Characteristics
(
Ta = 25
C, V
CC
= 12V, unless otherwise specified)
(1mT=10 Gauss)
Characteristics
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Bop
--
30
60
Gauss
Release Point
Brp
-60
-30
--
Gauss
Hysteresis Bhy
--
60
--
Gauss
AH281
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 0.7 Apr 16, 2004
4/7
Operating Characteristics
DOB DO
12
10
8
6
4
2
OFF
OP
RP
ON
Output Voltage in Volts
12
10
8
6
4
2
OFF
RP
OP
ON
Output Voltage in Volts
Bop
Brp
0
Bop
Brp
0
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
Vsat
Vsat
Performance Characteristics (SIP4)
Ta (
C)
25
50
60
70
80
85
90
95
100
105
110
115
120
Pd
(mW) 550 440 396 352 308 286 264 242
220
198
176 154 132
P o w e r D issip a tio n C u rve
1 0 0
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
0
2 5
5 0
7 5
1 0 0
1 2 5
1 5 0
T a ( C )
P d (m W )
AH281
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 0.7 Apr 16, 2004
5/7
Marking Information
(1)SIP-4L
281
Part Number
Year:
( Top View )
"2" = 2002
"1" = 2001
X XX X X
Nth week: 01~52
ID Code
Blank : normal
L : Lead Free Package
~
(2)SOT89-5L
1
2
3
5
7
4
281 Y M X
M : Month: A~L
Y : Year: 0-9
ID code
A~Z: Non-Lead Free
a~z : Lead Free
AH281
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 0.7 Apr 16, 2004
6/7
Package Information
(1)SIP-4L
Active Area Depth
Package Sensor Location
Marking side
0.7mm
1.97mm
1.04mm
1
2
3
4
Package Dimension
14.25mm
+/-1.25mm
1.03mm
+/-0.1
1.55mm
+/-0.1mm
0.38mm
+/-0.03mm
5.22mm
+/-0.1mm
4.20mm
+/-0.1mm
3.65mm
+/-0.1mm
1.42mm+/-0.1mm
1.27mm
+/-0.03mm
0.38mm
+/-0.03mm
0.30mm
+/-0.1mm
3.81mm +/-0.03mm
281
0.46mm +/-0.03mm
0.2mm Max.
5
o
-7
o
o
3
o
-5
o
3
o
-5
5
o
-7
o
AH281
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 0.7 Apr 16, 2004
7/7
(2)SOT89-5L
K
J
L
D
C
A
I
H
G
E
B
F
F
Package Sensor Location
X
Y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
Nom.
Max.
Min.
Nom.
Max.
A 4.40
4.50
4.60
0.173
0.177
0.181
B 4.05
4.15
4.25
0.159
0.163
0.167
C 1.50
1.60
1.70
0.059
0.063
0.067
D 1.30
1.40
1.50
0.051
0.055
0.059
E 2.40
2.50
2.60
0.094
0.098
0.102
F 0.80 -
-
0.031
-
-
G
3.00 Ref.
0.118 Ref.
H
1.50 Ref.
0.059 Ref.
I 0.40
0.46
0.52
0.016
0.018
0.020
J 1.40
1.50
1.60
0.055
0.059
0.063
K 0.35
0.39
0.43
0.014
0.015
0.017
L 5
o
Typ.
5
o
Typ.
X -
1.90
-
-
0.075
-
Y -
1.65
-
-
0.065
-
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