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 )
1
5
4
3
2
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
DOB
DO
GND
FG
Vdd
SOT89-5L
285
1
3
2
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)
AH285
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 1.0 Sep 29, 2005
2/9
Block Diagram (SIP5)
Hall
Plate
Control Logic
Regulator
Lock shutdown
and
Automatic recovery
Vdd
GND
DOB
DO
Amp.
2
3
4
5
1
FG
Typical Application Circuit (SIP5)
285
1
5
4
3
2
Vdd
(12V)
Coil2
Coil1
R
pu
FG
GND
D2
D1
R1
R2
C1
C2
56
Notes: R1, R2: typical
C1, C2, C3: typical 2.2 F
The R, C value need to be fine tuned
base on coils design.
C3
µ
12V DC Brush-less Fan with FG output function
AH285
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 1.0 Sep 29, 2005
3/9
Absolute Maximum Ratings
(Ta = 25
°C)
Characteristics
Symbol
Rating
Unit
Supply Voltage
Vdd
24
V
SIP5/SOT89-5
500
I
O(AVE)
SOT23-5 400
Output Current
I
O(PEAK)
700
mA
SIP5 550
SOT23-5 230
Power Dissipation
P
D
SOT89-5 800
mW
Operating Temperature
Topr
-40 ~ 100
°C
Storage Temperature
Tstg
-55 ~ 150
°C
Maximum Junction Temp.
Tj
150
°C
SIP5 227
SOT23-5 543
Thermal Resistance
jc
SOT89-5 156
°C/W
Electrical Characteristics
(
Ta = 25
°C, Vdd
= 12V, unless otherwise notice)
Characteristics
Symbol
Conditions
Min.
Typ.
Max.
Unit
Supply Voltage
Vdd
Operating
3.8
-
20
V
Supply current
Idd
Operating
-
2
4
mA
Output Leakage Current
Ioff
V
OUT
=24V -
<
0.1
10
µA
Locked Protection On
Tlrp-on
0.4 0.5 0.6 Sec
Locked Protection Off
Tlrp-off
2.4 3 3.6
Sec
I
O
=300mA -
375
500
Output saturation voltage
)
sat
(
OUT
V
I
O
=500mA -
625
900
mV
Output On resistance
Rds(on)
I
O
=300mA -
1.25
1.67
ohm
FG output Vds
Vol
I
O
=10mA
- 0.5 - V
Output Zener-breakdown Voltage
Vz
35
42
60
V
Magnetic Characteristics
(
Ta = 25
°C, Vdd
= 12V, unless otherwise specified)
(1mT=10 Gauss)
Characteristics
Symbol
Min.
Typ.
Max.
Unit
Operate Point
Bop
10
30
60
Gauss
Release Point
Brp
-60
-30
-10
Gauss
Hysteresis Bhy
-
60
-
Gauss
AH285
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 1.0 Sep 29, 2005
4/9
Operating Characteristics
DOB DO
12
10
8
6
4
2
OFF
OP
RP
ON
Out
put
V
o
lt
age
i
n
V
o
lt
s
12
10
8
6
4
2
OFF
RP
OP
ON
Out
put
V
o
lt
age
i
n
V
o
l
t
s
Bop
Brp
0
Bop
Brp
0
Magnetic Flux Density in Gauss
Magnetic Flux Density in Gauss
Vsat
Vsat
Marking side
S
( SIP5 )
N
Marking side
S
( SOT23-5 )
N
Marking side
S
( SOT89-5 )
N
Performance Characteristics (SIP5)
Ta (
°C)
25
50
60
70
80
85
90
95
100
Pd
(mW)
550 440 396 352 308 286 264 242 220
Ta (
°C)
105
110
115
120
125
130
135
140
150
Pd
(mW)
198 176 154 132 110 88 66 44 0
P o w e r D issip a tio n C u rve
0
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 )
AH285
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 1.0 Sep 29, 2005
5/9
Performance Characteristics (SOT23-5)
Ta (
°C)
25
50
60
70
80
90
100
110
120
130 140 150
Pd (mW) 230 184 166 147
129
110
92 74 55 37 18 0
P o w e r D is s ip a tio n C u rv e
0
1 0 0
2 0 0
3 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 )
Performance Characteristics (SOT89-5)
Ta (
°C)
25
50
60
70
75
80
85
90
95
100
Pd (mW)
800 640 576
512
480
448
416
384 352 320
Ta (
°C)
105
110
115
120
125
130
135
140
145
150
Pd (mW)
288 256 224
192
160
128
96 64 32 0
P o w e r D i s s i p a t i o n C u r v e
0
1 0 0
2 0 0
3 0 0
4 0 0
5 0 0
6 0 0
7 0 0
8 0 0
9 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 )
AH285
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 1.0 Sep 29, 2005
6/9
Marking Information
(1)SIP-5L
285
Part Number
Year:
( Front View )
"2" = 2002
"1" = 2001
X XX X x
Nth week: 01~52
ID Code: A ~ Z
Wafer Lot ID: L & a~z
is lead-free products
(2)SOT23-5L
R5:AH285
XX YM X
Date code
Y : Year
M :Month(A~L)
(Top View)
ID code
A~Z: Non-Lead Free
a~z: Lead Free
(3)SOT89-5L
1
2
3
5
7
4
285 Y M X
M : Month: A~L
Y : Year: 0-9
ID code
A~Z : Non-Lead Free
a~z : Lead Free
AH285
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 1.0 Sep 29, 2005
7/9
Package Information
(1)Package type: SIP-5L
( unit: mm / [inch] )
4.2 REF
[0.165 REF]
0.001]
[0.016
0.03
0.41
±
±
0.001]
[0.037
0.03
0.95
±
±
0.003]
[0.144
0.1
3.65
±
±
0.003]
[0.019
0.1
0.48
±
±
]
003
.
0
±
206
.
0
[
1
.
0
±
22
.
5
2-0.3C
[0.079-0.012C]
0.001]
[0.015
0.03
0.38
±
±
°
° 3
~
2
0.012]
[0.563
0.3
14.3
±
±
0.003]
[0.061
0.1
1.55
±
±
0.003]
[0.029
0.1
0.73
±
±
°
° 5
~
2
°
° 5
~
2
°
° 3
~
2
Location of Sensing Point
1.016 mm
[0.04 inch]
2.006 mm
[0.079 inch]
1
2
3
4
5
( Top View)
AH285
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 1.0 Sep 29, 2005
8/9
(2) SOT23-5L
L
e
E
HE
D
A2
A1
b(5x)
A
VIEW C
L1
1(4x)
2(4x)
e1
GAUGE PLANE
C
SEE VIEW C
X
Y
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min.
Nom.
Max.
Min.
Nom.
Max.
A 1.05 - 1.35
0.041 - 0.053
A1 0.05 - 0.15
0.002 - 0.006
A2 1.00
1.10
1.20
0.039
0.043
0.047
b 0.25 - 0.50
0.010
-
0.020
C 0.08 - 0.20
0.003
-
0.008
D 2.70
2.90
3.00
0.106
0.114
0.118
E 1.50
1.60
1.70
0.059
0.063
0.067
HE 2.60
2.80
3.00
0.102
0.110
0.118
L 0.30 - 0.60
0.012
-
0.024
L1 0.50
0.60
0.70
0.020
0.024
0.028
e 1.80
1.90
2.00
0.071
0.075
0.079
e1 0.85
0.95
1.05
0.033
0.037
0.041
0
o
5
o
10
o
0
o
5
o
10
o
1 3
o
5
o
7
o
3
o
5
o
7
o
2 6
o
8
o
10
o
6
o
8
o
10
o
X
- 1.067 - - 0.042 -
Y
- 0.432 - - 0.017 -
AH285
Hall-Effect Smart Fan Motor Controller
Anachip Corp.
www.anachip.com.tw
Rev 1.0 Sep 29, 2005
9/9
(3) Package type: 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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