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AH291
Low Voltage Hall-Effect Smart Fan Motor Controller Features
- On chip Hall sensor - Rotor-locked shutdown - Automatically restart - Built-in Zener protection for output driver - Operating voltage: 1.8V~5.75 V - Output current: IO( AVE ) = 400 mA
General Description
AH291 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. These protecting actions are repeated and periodic during the blocked period. Until the blocking is removed, the motor recovers running normally.
- Package: SIP-4L, SOT23-5L, SOT89-5L
Pin Assignment
NC 5 DOB 4
VCC 1 5 NC AH291 7 DOB 4 SOT89-5L
291
Front View
1 : VCC 2 : DO 3 : DOB
291
GND 2
12
3
4
4 : GND
1
2 SOT23-5
3 DO
DO 3
VCC GND
SIP-4L
Pin Descriptions
Name VCC DO DOB GND NC Description Input power Output pin Output pin Ground Not connected
Ordering Information
AH291 X - X X X
Wafer Body Blank or A~Z : if necessary to specify
Package P: SIP-4L W: SOT23-5L Y: SOT89-5L
Lead L : Lead Free Blank: Normal
Packing Blank : Tube or Bulk A : Tape & Reel
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. 0.6 Jan 27, 2005 1/9
AH291
Low Voltage Hall-Effect Smart Fan Motor Controller Block Diagram (SIP4)
VCC 1
Lock shutdown and Automatic recovery Regulator
2
Hall Plate
DO
Amp.
Control Logic
3
DOB
4 GND
Typical Application Circuit
1.8V/5.75V VCC D2
D1
291
L2 L1
1
2
3
4 GND
C3 DO
Notes: R1, R2: typical 56 C1, C2, C3: typical 2.2F The R, C value need to be fine tuned base on coils design.
DOB
R1 C1
R2 C2
1.8V/5.75V brush-less DC fan
Anachip Corp. www.anachip.com.tw 2/9
Rev 0.6 Jan 27, 2005
AH291
Low Voltage Hall-Effect Smart Fan Motor Controller Absolute Maximum Ratings
Characteristics
(Ta = 25C)
Symbol Rating Unit
Output Zener-breakdown Voltage Operating Supply Voltage Output Current Power Dissipation Operating Temperature Storage Temperature Maximum Junction Temp. PD
Vz VCC IO(AVE) IO(PEAK) SIP4 SOT23-5 SOT89-5 Topr Tstg Tj
38 8 400 700 550 230 800 -20 ~ 100 -55 ~ 150 150
V V mA mW
C C C
Electrical Characteristics (Ta = 25 C, VCC = 5V, unless otherwise specified)
Characteristics Symbol Conditions Min. Typ. Max. Unit
Supply Voltage Supply current Lock Protection On Lock Protection Off Output saturation voltage Output On resistance
Vcc
Icc Tlrp-on Tlrp-off
Operating Operating
1.8 2.4 -
2.6 0.4 3 300 600 1.75
5.75 4.0 3.6 -
V mA Sec Sec mV ohm
VOUT( sat )
IO=180mA IO=350mA
Rds(on)
Magnetic Characteristics (Ta = 25 C, VCC = 5V, unless otherwise specified)
(1mT=10 Gauss)
Characteristics Symbol Min. Typ. Max. Unit
Operate Point Release Point Hysteresis
Bop Brp Bhy
--60 --
30 -30 60
60 ---
Gauss Gauss Gauss
Anachip Corp. www.anachip.com.tw 3/9
Rev 0.6 Jan 27, 2005
AH291
Low Voltage Hall-Effect Smart Fan Motor Controller Operating Characteristics
DOB
Output Voltage in Volts Output Voltage in Volts 12 10 8 6 4 ON 2 OP Vsat Brp 0 Bop Magnetic Flux Density in Gauss
DO
12 10 8 6 4 RP Vsat Brp 0 Bop Magnetic Flux Density in Gauss 2 ON
RP
OFF
OFF
OP
Performance Characteristics (SIP4)
Ta (C) Pd (mW) Ta (C) Pd (mW)
P d (m W ) 600 500 400 300 200 100 0 0 25 50 75 100 125 150 T a ( C )
25 550 105 198
50 440 110 176
60 396 115 154
70 352 120 132
80 308 125 110
85 286 130 88
90 264 135 66
95 242 140 44
100 220 150 0
P o w e r D is s ip a tio n C u rve
Anachip Corp. www.anachip.com.tw 4/9
Rev 0.6 Jan 27, 2005
AH291
Low Voltage Hall-Effect Smart Fan Motor Controller Performance Characteristics (SOT23-5)
Ta (C) 25 50 60 70 80 90 100 110 120 130 140 150
Pd (mW)
P d (m W )
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 300 200 100 0 0 25 50 75 100 125 150
T a ( C )
Performance Characteristics (SOT89-5)
Ta (C) 25 50 60 70 75 80 85 90 95 100
Pd (mW)
Ta (C)
800
105
640
110
576
115
512
120
480
125
448
130
416
135
384
140
352
145
320
150
Pd (mW)
P d (m W )
288
256
224
192
160
128
96
64
32
0
P o w e r D is s ip a tio n C u r v e
900 800 700 600 500 400 300 200 100 0 0 25 50 75 100 125 150
T a ( C )
Anachip Corp. www.anachip.com.tw 5/9
Rev 0.6 Jan 27, 2005
AH291
Low Voltage Hall-Effect Smart Fan Motor Controller Marking Information
(1) SIP-4L
( Top View ) Part Number
291 X XX X X
Blank : normal L : Lead Free Package ID Code Nth week: 01~52 Year: "1" = 2001 "2" = 2002 ~
(2)SOT23-5L
(Top View) ID code A~Z: Non-Lead Free a~z: Lead Free RA:AH291 Date code Y : Year M :Month(A~L)
XX YM X
(3)SOT89-5L
5
4
7
291 Y M X
1
2
3
ID code A~Z: Non-Lead Free a~z : Lead Free M : Month: A~L Y : Year: 0-9
Anachip Corp. www.anachip.com.tw 6/9
Rev 0.6 Jan 27, 2005
AH291
Low Voltage Hall-Effect Smart Fan Motor Controller Package Information
(1)SIP-4L
Active Area Depth
Marking side
Package Sensor Location
1.97mm 1.04mm
0.7mm
1
2
3
4
Package Dimension
5 -7 1.55mm +/-0.1mm 1.03mm +/-0.1 0.30mm +/-0.1mm 3 -5
o o o o
14.25mm +/-1.25mm 0.38mm +/-0.03mm
3.65mm +/-0.1mm
0.46mm +/-0.03mm
0.41mm +/-0.03mm 3.81mm +/-0.03mm
5.22mm +/-0.1mm 4.20mm +/-0.1mm
5 -7
o
o
3 -5
o
o
291
0.2mm Max. 1.42mm+/-0.1mm
1.27mm +/-0.03mm
Anachip Corp. www.anachip.com.tw 7/9
Rev 0.6 Jan 27, 2005
AH291
Low Voltage Hall-Effect Smart Fan Motor Controller
(2)SOT23-5L
D e1
1(4x)
5
4 0.10 C 5x Seating Plane
E1 Y 1 X e 2 3 b
E
A
A2
A1
2(4x)
With Plating
b1
C
C1
Gauge Plane 0.25 mm
Base Metal
b
L L1
Symbol
Dimensions In Millimeters Min. 1.05 0.05 1.00 0.25 0.25 0.08 0.08 2.70 2.60 1.50 0.35 Nom. 1.20 0.10 1.10 0.40 0.11 2.85 2.80 1.60 0.45 0.60 Ref. 0.95 Bsc. 1.90 Bsc. 5o 5o o 8 1.067 0.432 Max. 1.35 0.15 1.20 0.55 0.45 0.20 0.15 3.00 3.00 1.70 0.55
Dimensions In Inches Min. 0.041 0.002 0.039 0.010 0.010 0.003 0.003 0.106 0.102 0.059 0.014 Nom. 0.047 0.004 0.043 0.016 0.004 0.112 0.110 0.063 0.018 0.024 Ref. 0.037 Bsc. 0.075 Bsc. 5o 5o o 8 0.042 0.017 Max. 0.053 0.006 0.047 0.022 0.018 0.008 0.006 0.118 0.118 0.067 0.022
A A1 A2 b b1 c c1 D E E1 L L1 e e1 1 2 X Y
0o 3o o 6 -
10o 7o o 10 -
0o 3o o 6 -
10o 7o o 10 -
Anachip Corp. www.anachip.com.tw 8/9
Rev 0.6 Jan 27, 2005
AH291
Low Voltage Hall-Effect Smart Fan Motor Controller
(3)SOT89-5L
A C D F
E
B K
J F L I H G
Package Sensor Location
Y
X
Symbol
A B C D E F G H I J K L X Y
Dimensions In Millimeters Min. Nom. Max. 4.40 4.50 4.60 4.05 4.15 4.25 1.50 1.60 1.70 1.30 1.40 1.50 2.40 2.50 2.60 0.80 3.00 Ref. 1.50 Ref. 0.40 0.46 0.52 1.40 1.50 1.60 0.35 0.39 0.43 5o Typ. 1.90 1.65 -
Dimensions In Inches Min. Nom. Max. 0.173 0.177 0.181 0.159 0.163 0.167 0.059 0.063 0.067 0.051 0.055 0.059 0.094 0.098 0.102 0.031 0.118 Ref. 0.059 Ref. 0.016 0.018 0.020 0.055 0.059 0.063 0.014 0.015 0.017 5o Typ. 0.075 0.065 -
Anachip Corp. www.anachip.com.tw 9/9
Rev 0.6 Jan 27, 2005

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