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AH293
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Description
AH293 is a monolithic fan motor controller with Hall sensor’s
capability. It contains two complementary open-collector
transistors for Motor’s coil driving, automatic lock current
shutdown, and recovery protections. Also, rotor-state
detection (RD) output is for speed detection.
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.
The AH293 is available in SOT89-5L package.
Features
• On Chip Hall Sensor
• Rotor-Locked Shutdown
• Automatically Restart
• Rotor-State Detection (RD) Output
• Built-in Zener Protection for Output Driver
• Operating Voltage: 1.8V~5.75 V
• Output Current: I
• Packaged in SOT89-5L
• Green Molding Compound
O(AVE)
= 400 mA
Pin Assignments
(Top View)
Vdd
1
GND
2
3 7
293
SOT89-5L
RD
5
DOBDO
4
Applications
• Two-coil BLDC cooling fans
• Low to medium voltage, low power BLDC motors
Typical Application Circuit (Note 1)
V
dd
(1.8V/5.75V)
D1
RD
(alarm)
Notes: 1. R1, R2: typical 56 Ohm
C1, C2, C3: typical 2.2µF
The R, C value need to be fine tuned based
on coils design.
1.8V/5.75V DC Brush-Less Fan with RD Output Function
AH293
Document number: DS31048 Rev. 6 - 2
R
pu
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D2
293
Coil2 Coil1
1
32
4
5
GND
C3
R1 R2
C1 C2
June 2010
© Diodes Incorporated
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Pin Descriptions
Pin Name Description
RD Rotor-State Detection
Vdd Input Power
DO Output Pin
DOB Output Pin
GND Ground
Functional Block Diagram
Vdd
AH293
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Regulator
Hall
Plate
AH293
Document number: DS31048 Rev. 6 - 2
Amp.
Lock detect,
shutdown and
automatic re-start
Control Logic
GND
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RD
DO
DOB
June 2010
© Diodes Incorporated
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AH293
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Absolute Maximum Ratings (T
Symbol Characteristics Rating Unit
Vdd Operating Supply Voltage 8 V
I
Output Current 400 mA
O(AVE)
I
Output Current 700 mA
O(PEAK)
PD Power Dissipation 800 mW
TST Storage Temperature -55 ~ 150
TJ Maximum Junction Temperature 150
Recommended Operating Conditions
Symbol Characteristic Conditions Min Max Unit
Vdd Supply Voltage (Note 2) Operating 1.8 5.75 V
TA Operating Ambient Temp erature Operating -20 100
Notes: 2. The output of IC will be switched after the supply voltage is over 1.8V, but the magnetic characteristics won't be normal until the
supply is over 2.0V.
= 25°C)
A
°C
°C
°C
Electrical Characteristics (T
= 25 °C, Vdd = 5V, unless otherwise specified)
A
Symbol Characteristics Conditions Min Typ. Max Unit
Idd Supply current Operating - 2.6 4.0 mA
T
RLP-ON
T
RLP-OFF
V
OUT(SAT)
R
DS(ON)
Rotor Lock Protection On Time - 0.4 - Sec
Rotor Lock Protection Off Time 2.4 3 3.6 Sec
I
= 180mA - 300 - mV
Output Saturation Voltage
O
IO = 350mA - 600 - mV
Output On Resistance - 1.75 - ohm
VOL RD Output Vds IO = 10mA - 0.5 - V
Vz Output Zener-Breakdown Voltage - 15 - V
Truth Table (Note 3)
IN- IN+ CT OUT1 OUT2 RD Mode
H L L H L L Rotating
L H L L H L Rotating
- - H off off off Lockup protection activated
Notes: 3. Latch-type RD output is low during rotor rotation and high when the rotor is locked (not rotating)
AH293
Document number: DS31048 Rev. 6 - 2
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© Diodes Incorporated
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LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Magnetic Characteristics (T
Symbol Characteristics Min Typ. Max Unit
Bop Operation Point - 30 60 Gauss
Brp Release Point -60 -30 - Gauss
Bhy Hysteresis - 60 - Gauss
Notes: 4. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Operating Characteristics
DOB DO
= 25 °C, Vdd = 5V, unless otherwise specified, Note 4)
A
(1mT = 10 Gauss)
AH293
RP
ON
Output Voltage in Volts
12
10
8
6
4
2
OFF
OP
Vsat Vsat
OFF
RP
Output Voltage in Volts
Magnetic Flux Density in GaussMagnetic Flux Density in Gauss
12
10
8
6
4
2
OP
ON
BopBrp 0BopBrp 0
S
Marking
side
AH293
Document number: DS31048 Rev. 6 - 2
N
( SOT89-5L )
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Performance Characteristics
25 50 60 70 75 80 85 90 95 100
800 640 576 512 480 448 416 384 352 320
105 110 115 120 125 130 135 140 145 150
288 256 224 192 160 128 96 64 32 0
-40
0 25 50 75 100 125 150
TA (°C)
PD (mW)
TA (°C)
PD (mW)
P
D
(mW)
900
800
700
600
500
400
300
200
100
0
AH293
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Power Dissipation Curve
TA (°C)
AH293
Document number: DS31048 Rev. 6 - 2
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AH293
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
Ordering Information
AH 293 - Y G - 13
PackingPackage Green
Y : SOT89-5L 13 : Tape & ReelG : Green (Note 5)
Device
AH293-YG-13 Y SOT89-5L NA NA 2500/Tape & Reel -13
Notes: 5. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
6. 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.
7. Reverse taping as shown on Diodes Inc. Surface Mount (SMD) Packaging document AP02007, which can be found on our website
http://www.diodes.com/datasheets/ap02007.pdf.
Package
Code
Packaging
(Note 6, 7)
Quantity
Bulk 13” Tape and Reel
Part Number
Suffix
Quantity
Part Number
Suffix
Marking Information
(Top View)
5
293 Y W X
1 2 3
SOT89-5L
4
7
Y : Year : 0~9
: Week : A~Z : 1~26 week;
W
a~z : 27~52 week;
z represents 52 and 53 week
: Internal code
X
A~Z : Green
AH293
Document number: DS31048 Rev. 6 - 2
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LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
Package Outline Dimensions (All Dimensions in mm)
AH293
CONTROLLER
Sensor Location
AH293
Document number: DS31048 Rev. 6 - 2
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© Diodes Incorporated
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AH293
LOW VOLTAGE HALL-EFFECT SMART FAN MOTOR
CONTROLLER
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Copyright © 2010, Diodes Incorporated
www.diodes.com
AH293
Document number: DS31048 Rev. 6 - 2
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