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AH284
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Description
The AH284 is a single-chip solution for driving two-coil
brushless direct current (BLDC) fans and motors. The device
includes a Hall-effect sensor, dynamic offset correction and
two complementary open-drain output drivers with internal
Zener diode protection.
To help protect the motor coils, the AH284 provides Rotor
Lock Protection which shuts down output drives if rotor lock is
detected. The device automatically re-starts when the rotor
lock is removed.
The AH284 is available in SIP4 and SOT89-5L packages.
Features
• Single-chip solution
• Operating Voltage: 3.8V to 20V
• Built-in Hall sensor and input amplifier
• Rotor Lock Protection (Lock detection, output shutdown
and automatic re-start)
• Built-in Zener protection for output driver
• Average output current up to 500mA
• Packages: SIP-4L and SOT89-5L
• Green Molding Compound
Pin Assignments
(Top View)
284
12 43
SIP-4L
1 : Vdd
2 : DO
3 : DOB
4 : GND
Vdd
GND
(Top View)
1
284
2
3 7
SOT89-5L
Applications
• Two-coil BLDC cooling fans
• Low to medium voltage, low power BLDC motors
NC
5
DOBDO
4
Typical Application Circuit (Note 1)
12V
D3
Notes: 1. Typically it is recommended to us a 56 Ohm resistor for R1 and R2 and a 2.2μF E-Cap capacitor for C1, C2 and C3. These values
may need to be optimized depending on the coils used.
To help with IC protection it’s advised to add a Zener diode between Vdd and ground. The Zener diode should be chosen to help
prevent the supply voltage exceeding the maximum rating of the device.
V
dd
D1
C3
D2
284
1234
DO
L2 L1
GND
DOB
R1 R2
C1 C2
AH284
Document number: DS31051 Rev. 11 - 2
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Pin Descriptions
Pin Name Description
Vdd Input Power
DO Output Pin
DOB Output Pin
GND Ground
NC Not Connected
Functional Block Diagram
Vdd
Regulator
AH284
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Lock detect,
shutdown and
automatic re-start
DO
Hall
Plate
Amp.
Control Logic
DOB
GND
AH284
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AH284
θJAθ
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Absolute Maximum Ratings (T
Symbol Characteristics Rating Unit
Vdd Supply Voltage 24 V
IO Output Current
PD Power Dissipation
TST Storage Temperature -55 ~ 150
TJ Maximum Junction Temperature 150
θ
JA
Thermal Resistance Junction to
Case (Note 2)
= 25°C)
A
TJ
I
O (AVE)
I
O (PEAK)
SIP-4L 500 mA
SOT89-5L 500 mA
700 mA
SIP-4L 550 mW
SOT89-5L 800 mW
SIP-4L 227
SOT89-5L 156
TA
Tc
°C
°C
°C/W
°C/W
JC
Notes: 2. θJA should be confirmed with heat sink thermal resistance. If there is no heat sink contact, θJA will almost be the same as θJC..
Recommended Operating Conditions
Symbol Characteristic Conditions Min Max Unit
Vdd Supply Voltage Operating 3.8 20 V
TA Operating Ambient Temperature Operating -40 100
°C
AH284
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AH284
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Electrical Characteristics (T
= 25 °C, Vdd = 12V, unless otherwise specified)
A
Symbol Characteristics Conditions Min Typ. Max Unit
Idd Supply Current Operating - 2.0 4.0 mA
I
Output Leakage Current V
OFF
T
RLP-ON
T
RLP-OFF
V
OUT(SAT)
R
DS(ON)
Rotor Lock Protection On Time 0.4 0.5 0.6 Sec
Rotor Lock Protection Off Time 2.4 3 3.6 Sec
Output Saturation Voltage
Output On Resistance IO = 300mA - 1.25 1.67 ohm
= 24V - < 0.1 10 μA
OUT
= 300mA - 375 500
I
O
IO = 500mA - 625 900
VZ Output Zener-Breakdown Voltage 35 42 60 V
Truth Table
IN- IN+ CT OUT1 OUT2 Mode
H L L H L Rotating
L H L L H Rotating
- - H off off Lockup protection activated
Magnetic Characteristics (T
= 25 °C, Vdd = 12V, unless otherwise specified, Note 3)
A
(1mT = 10 Gauss)
Symbol Characteristics Min Typ. Max Unit
Bop Operation Point 10 30 60 Gauss
Brp Release Point -60 -30 -10 Gauss
Bhy Hysteresis - 60 - Gauss
Notes: 3. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
mV
AH284
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Operating Characteristics
DOB DO
AH284
HALL-EFFECT SMART FAN MOTOR CONTROLLER
RP
Output Voltage in Volts
ON
12
10
8
6
4
2
OFF
OP
V
SAT
S
Marking
side
OFF
RP
Output Voltage in Volts
V
SAT
Magnetic Flux Density in GaussMagnetic Flux Density in Gauss
S
Marking
side
12
10
8
6
4
2
OP
ON
BopBrp 0BopBrp 0
AH284
Document number: DS31051 Rev. 11 - 2
N
( SIP-4L )
( SOT89-5L )
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A
Performance Characteristics
(1) SIP-4L
T
(°C)
PD (mW)
TA (°C)
PD (mW)
(mW)
P
D
600
500
400
300
200
25 50 60 70 80 85 90 95 100
550 440 396 352 308 286 264 242 220
105 110 115 120 125 130 135 140 150
198 176 154 132 110 88 66 44 0
AH284
HALL-EFFECT SMART FAN MOTOR CONTROLLER
Power Dissipation Curve
100
0
0 25 50 75 100 125 150
TA (°C)
(2) SOT89-5L
TA (°C)
PD (mW)
TA (°C)
PD (mW)
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
(mW)
P
D
900
800
700
600
500
400
300
200
100
0
-40
0 25 50 75 100 125 150
Power Dissipation Curve
TA (°C)
AH284
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Ordering Information
AH284
HALL-EFFECT SMART FAN MOTOR CONTROLLER
AH 284 - X G - X
Package Green
P : SIP-4L
G : Green (Note 4)
Y : SOT89-5L 13 : Tape & Reel
Device
AH284-PG-B P SIP-4L 1000 -B NA NA
AH284-YG-13 Y SOT89-5L NA NA 2500/Tape & Reel -13
Notes: 4. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html
5. 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.
6. 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 5, 6)
Quantity
.
Bulk 13” Tape and Reel
Part Number
Suffix
Packing
B : Bulk
Quantity
Part Number
Suffix
Marking Information
(1) SIP-4L
Part Number
( Top View )
284
Y WW X
: Year : 0~9
Y
: Week : 01~52, "52" represents
WW
52 and 53 week
X : Internal Code : A~Z : Green
(2) SOT89-5L
AH284
Document number: DS31051 Rev. 11 - 2
( Top View )
5
284 Y W X
1 2 3
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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
June 2010
© Diodes Incorporated
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HALL-EFFECT SMART FAN MOTOR CONTROLLER
Package Outline Dimensions (All Dimensions in mm)
(1) Package type: SIP-4L
AH284
Active Area Depth
Package Dimension
0.7mm
Marking side
1.95士0.1mm
1.1士0.1mm
1234
Sensor Location
AH284
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HALL-EFFECT SMART FAN MOTOR CONTROLLER
Package Outline Dimensions (Continued)
(2) Package type: SOT89-5L
AH284
Sensor Location
AH284
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AH284
HALL-EFFECT SMART FAN MOTOR CONTROLLER
IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS
DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other
changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability
arising out of the application or use of this document or any product described herein; neither does Diodes In corporated convey any
license under its patent or trademark rights, nor the rights of others. Any Customer or user of this documen t or products described
herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies
whose products are represented on Diodes Incorporated website, harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized
sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall
indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign p atents pending. Product names
and markings noted herein may also be covered by one or more United States, international or foreign trademarks.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without
the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided
in the labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected
to cause the failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support dev ices or
systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements
concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,
notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further,
Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes
Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2010, Diodes Incorporated
www.diodes.com
AH284
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