A
TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Description
The AH2984 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. It is
optimized for low start-up voltage.
To help protect the motor coils, the AH2984 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.
Over temperature shutdown provides thermal protection for the
device.
The AH2984 is available in SIP4 and SOT89-5 packages.
Features
Pin Assignments
Vdd
(Top View)
AH2984
1 2 4 3
SIP- 4
(Top View)
1
H2984
1 : V
DD
2 : DO
3 : DOB
4 : GND
NC
5
• Single-chip solution
• Operating Voltage: 2.5V to 15V
• Built-in Hall sensor and input amplifier
• Rotor Lock Protection (Lock detection, output shutdown and
automatic re-start)
• Built-in reverse voltage protection diode
• Built-in Zener protection for output drivers
• Average output current up to 500mA
• Packages: SIP-4 and SOT89-5
• “Green” Molding Compound
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Applications
• Two-coil BLDC Cooling Fans
• Low Voltage/ Low Power BLDC Motors
GND
AH2984
2
3 7
SOT89-5
4
GND
DOBDO
AH2984
Document number: DS31698 Rev. 4 - 2
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Typical Applications Circuit (Note 4)
(1) For SIP-4
12V
Vdd
H2984
D2
(2) For SOT89-5
Vdd
(12V)
D1
D1
AH2984
Vdd DO DOB G ND
1234
C
12V Brushless DC Fan
5 4
NC DOB
AH2984
Vdd DOGND
132
C
L1 L2
GND
D2
GND
L1
L2
12V Brushless DC Fan
Note: 4. D1 (Zener Diode) and Capacitor C are for power stabilization. Recommended value of C is 1μF/ 50V (E-Cap). Diode D2 is optional and helps
to protect the device and fan coils from reverse power conditions. The AH2984 also includes an internal reverse blocking diode at V
Pin Descriptions
AH2984
Document number: DS31698 Rev. 4 - 2
Pin Name SIP-4 SOT89-5 Description
VDD
DO 2 3 Output Pin
DOB 3 4 Output Pin
GND 4 2 Ground
NC — 5 No Connection
1 1 Input Power
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GND
pin.
DD
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Functional Block Diagram
(1) For SIP-4
Vdd
1
Regulator
Hall
Plate
Amp.
Lock detect,
Shutdown and
Automatic re-start
Control Logic
2
3
H2984
DO
DOB
(2) For SOT89-5
Vdd
1
Regulator
Hall
Plate
Amp.
4
GND
Lock detect,
Shutdown and
Automatic re-start
Control Logic
5
3
4
NC
DO
DOB
2
GND
AH2984
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)
)
y
H2984
Absolute Maximum Ratings (@T
Symbol Conditions Rating Unit
VDD
V
RDD
I
O(AVE
I
O(peak as hold
PD
TST
TJ
θJA
θJC
Reverse VDD Polarity Voltage
Supply Voltage 18 V
Output Current
(Note 5)
Power Dissipation
Storage Temperature -55 to +150 C
Maximum Junction Temperature +150 C
Thermal Resistance (Note 6)
Thermal Resistance (Note 6)
= +25°C, unless otherwise specified.)
A
SIP-4 550 mW
SOT89-5 800 mW
SIP-4 227 C/W
SOT89-5 168 C/W
SIP-4 49 C/W
SOT89-5 36 C/W
TA
TJ
JA
Tc
-15 V
500
800
mA
JC
Recommended Operating Conditions (@T
= +25°C, unless otherwise specified.)
A
Symbol Parameter Conditions Min
VDD
TA
Supply Voltage Operating 2.5
Operating Ambient Temperature (Note 5) Operating -40
Max
15
+105
Unit
V
C
Electrical Characteristics (@T
= +25°C; V
A
= 12V; unless otherwise specified, Note 4)
DD
Symbol Characteristics Conditions Min Typ. Max Unit
IDD
T
on
T
off
R
dut
R
DS(ON)
VZ
Notes: 5. Shall not exceed PD and Safety Operation Area.
6. θ
7. The V
Supply Current
Locked Protection On Time —
Locked Protection Off Time —
Locked Protection Duty Ratio
Output On Resistance
Output Zener-Breakdown Voltage (Note 7) 24 33 42 V
should be confirmed with heat sink thermal resistance. SOT89 exposed pad soldered to minimum recommended landing pads (see Package Outline
JA
Dimension section) on 2”x2” two-layer 2oz.copper FR4 PCB with thermal vias in the exposed pad connecting to the copper flood on the bottom layer.
value is in D.C voltage measurement. The VZ may vary with coils in A.C. voltage measurements.
Z
Operating, VDD = 12V
T
off/Ton
I
= 300mA
O
IO= 500mA
2.0 3.5 5.0 mA
—
—
—
—
—
0.25
3.25
13
1 1.67
1.25 1.8
—
—
—
s
s
—
Ω
AH2984
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H2984
Magnetic Characteristics (T
Symbol Characteristics Min Typ. Max Unit
BOP
BRP
BHY
Note: 8. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
= +25C, VDD = 2.5V to 15V, Note 8)
A
(1mT=10 Gauss)
Operate Point 5 30 60 Gauss
Release Point -60 -30 -5 Gauss
Hysteresis 20 60 120 Gauss
Operating Characteristics
DOB
RP
ON
Output Voltage in Volts
OFF
OP
Vsat Vsat
OFF
RP
Output Voltage in Volts
Magnetic Flux Density in GaussMagnetic Flux Density in Gauss
DO
OP
ON
BopBrp 0BopBrp 0
S
Marking side
S
Marking
side
N
( SIP-4)
AH2984
Document number: DS31698 Rev. 4 - 2
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N
(SOT89-5
)
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Performance Characteristics
(1) SIP-4
T
(C)
A
PD(mW)
TA(C)
PD(mW)
PD(mW)
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
600
500
400
300
200
H2984
Power Dissipation Curve
(2) SOT89-5
T
PD (mW)
TA (C)
PD (mW)
(C)
A
PD(mW)
100
0
0 25 50 75 100 125 150
-40
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
105
(oC)
T
A
Power Dissipation Curve
900
800
700
600
500
400
300
200
100
0
0 25 50 75 100 125 150
-40
AH2984
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105
(°C)
T
A
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Ordering Information (Note 9)
H2984
AH2984 - X G - X
Package Green
P : SIP-4L
G : Green
Y : SOT89-5L
Packing
B : Bulk
13 : Tape & Reel
Device
AH2984-PG-B P SIP-4 1000 -B NA NA
AH2984-YG-13 Y SOT89-5 NA NA 2500/Tape & Reel -13
Note: 9. For packaging details, go to our website at http://www.diodes.com/products/packages.html
Package
Code
Packaging
(Note 9)
Quantity
Bulk 13” Tape and Reel
Part Number
Suffix
Quantity
Part Number
Suffix
Marking Information
(1) SIP-4
Part Number
(Top View)
2984
Y WW X
Y : Year : 0~9
: Week : 01~52, "52" represents
WW
52 and 53 week
X : Internal Code : A~Z : Green
(2) SOT89-5
(Top View)
5
XX Y W X
1 2 3
Device Package Identification Code
AH2984 SOT89-5 K1
4
7
XX
: Identification code
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
AH2984
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Package Outline Dimensions (All dimensions in mm.)
(1) Package type: SIP-4L
a
1︵2
x
︶
A
S
a
2︵2
x
︶
b
E
D
J
2
L
1
L
F
c
b
1
e
1
H2984
Dim Min Max Typ
A 1.45 1.65 1.55
b1 0.38 0.44 0.40
b2 — — 0.48
x
︶
2
°
︵
5
4
x
3
.
0
c 0.35 0.45 0.40
D 5.12 5.32 5.22
e1 1.24 1.30 1.27
E 3.55 3.75 3.65
F 0.00 0.20 —
J 4.10 4.30 4.20
L 14.00 14.60 14.30
L1 1.32 1.52 1.42
a
4︵2
a
3︵2
x
︶
x
︶
S 0.63 0.83 0.73
a1 — 5° 3°
a2 4° 7° 5°
a3 4° 7° 5°
a4 — 5° 3°
All Dimensions in mm
SIP-4
AH2984
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Package Outline Dimensions (All dimensions in mm.)
(2) Package type: SOT89-5L
D
1
E
B
1
8° ︵4
x
︶
D
0
0
2
.
0
R
L
L
B
e
A
C
H
H2984
SOT89-5
Dim Min Max Typ
A 1.40 1.60 1.50
B 0.50 0.62 0.56
B1 0.44 0.54 0.48
C 0.35 0.43 0.38
D 4.40 4.60 4.50
D1 1.62 1.83 1.733
E 2.40 2.60 2.50
e — — 1.50
H 3.95 4.25 4.10
L 0.65 0.95 0.80
All Dimensions in mm
1.24/1.44
AH2984
Document number: DS31698 Rev. 4 - 2
0.73/0.87
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H2984
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 Incorporated convey any license under its patent or
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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.
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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 patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
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 devices 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 © 2013, Diodes Incorporated
www.diodes.com
IMPORTANT NOTICE
LIFE SUPPORT
AH2984
Document number: DS31698 Rev. 4 - 2
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