AH2984

AH2984
TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER
Description
Pin Assignments
The AH2984 is a single-chip solution for driving two-coil brushless
(Top View)
direct current (BLDC) fans and motors. The device includes a Halleffect sensor, dynamic offset correction and two complementary
open-drain output drivers with internal Zener diode protection. It is
AH2984
optimized for low start-up voltage.
1 : VDD
To help protect the motor coils, the AH2984 provides Rotor Lock
2 : DO
Protection which shuts down output drives if rotor lock is detected.
3 : DOB
The device automatically re-starts when the rotor lock is removed.
Over temperature shutdown provides thermal protection for the
1 2
device.
3
4 : GND
4
SIP-4
The AH2984 is available in SIP4 and SOT89-5 packages.
(Top View)
Vdd 1
Features
•
Single-chip solution
•
Operating Voltage: 2.5V to 15V
•
Built-in Hall sensor and input amplifier
•
Rotor Lock Protection (Lock detection, output shutdown and
GND 2
5 NC
AH2984
DO 3
GND
74 DOB
automatic re-start)
SOT89-5
•
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)
•
Two-coil BLDC Cooling Fans
Halogen and Antimony Free. “Green” Device (Note 3)
•
Low Voltage/ Low Power BLDC Motors
•
Notes:
Applications
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.
AH2984
Document number: DS31698 Rev. 4 - 2
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AH2984
Typical Applications Circuit
(Note 4)
(1) For SIP-4
12V
D2
Vdd
AH2984
Vdd
1
L1
DO DOB GND
2
3
L2
4
GND
D1
C
12V Brushless DC Fan
(2) For SOT89-5
D2
Vdd (12V)
5
4
NC
GND DOB
L1
AH2984
D1
Vdd
GND
DO
1
2
3
L2
C
GND
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 VDD pin.
Pin Descriptions
Pin Name
SIP-4
SOT89-5
Description
VDD
1
1
Input Power
DO
2
3
Output Pin
DOB
3
4
Output Pin
GND
4
2
Ground
NC
—
5
No Connection
AH2984
Document number: DS31698 Rev. 4 - 2
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AH2984
Functional Block Diagram
(1) For SIP-4
Vdd
1
Lock detect,
Shutdown and
Automatic re-start
Regulator
Hall
Plate
Control Logic
Amp.
2
DO
3
DOB
5
NC
3
DO
4
DOB
4
GND
(2) For SOT89-5
Vdd
1
Lock detect,
Shutdown and
Automatic re-start
Regulator
Hall
Plate
Control Logic
Amp.
2
GND
AH2984
Document number: DS31698 Rev. 4 - 2
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AH2984
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
Conditions
Rating
Unit
VDD
Supply Voltage
18
V
VRDD
Reverse VDD Polarity Voltage
-15
V
IO(AVE)
IO(peak as hold)
500
Output Current (Note 5)
mA
800
PD
Power Dissipation
TST
Storage Temperature
TJ
Maximum Junction Temperature
θJA
Thermal Resistance (Note 6)
θJC
Thermal Resistance (Note 6)
SIP-4
550
mW
SOT89-5
800
mW
-55 to +150
C
+150
C
SIP-4
227
C/W
SOT89-5
168
C/W
SIP-4
49
C/W
SOT89-5
36
C/W
TA
TJ
Tc
 JA
 JC
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VDD
TA
Parameter
Conditions
Min
Max
Unit
Operating
Operating
2.5
-40
15
+105
V
C
Supply Voltage
Operating Ambient Temperature (Note 5)
Electrical Characteristics (@TA = +25°C; VDD = 12V; unless otherwise specified, Note 4)
Symbol
IDD
Ton
Toff
Rduty
RDS(ON)
VZ
Notes:
Characteristics
Supply Current
Locked Protection On Time
Locked Protection Off Time
Locked Protection Duty Ratio
Output On Resistance
Output Zener-Breakdown Voltage
Conditions
Operating, VDD = 12V
—
—
Toff/Ton
IO= 300mA
IO= 500mA
(Note 7)
Min
Typ.
Max
Unit
2.0
—
—
—
—
—
24
3.5
0.25
3.25
13
1
1.25
33
5.0
—
—
—
1.67
1.8
42
mA
s
s
—
Ω
V
5. Shall not exceed PD and Safety Operation Area.
6. θJA should be confirmed with heat sink thermal resistance. SOT89 exposed pad soldered to minimum recommended landing pads (see Package Outline
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.
7. The VZ value is in D.C voltage measurement. The VZ may vary with coils in A.C. voltage measurements.
AH2984
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AH2984
Magnetic Characteristics (TA = +25C, VDD = 2.5V to 15V, Note 8)
(1mT=10 Gauss)
Note:
Symbol
Characteristics
Min
Typ.
Max
Unit
BOP
BRP
BHY
Operate Point
Release Point
Hysteresis
5
-60
20
30
-30
60
60
-5
120
Gauss
Gauss
Gauss
8. The magnetic characteristics may vary with supply voltage, operating temperature and after soldering.
Operating Characteristics
DO
RP
OFF
ON
OP
Output Voltage in Volts
Output Voltage in Volts
DOB
Vsat
Brp
0
OP
RP
ON
Vsat
Bop
Brp
Magnetic Flux Density in Gauss
OFF
S
Marking side
N
N
( SIP-4)
(SOT89-5)
Document number: DS31698 Rev. 4 - 2
Bop
S
Marking side
AH2984
0
Magnetic Flux Density in Gauss
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AH2984
Performance Characteristics
(1) SIP-4
25
550
105
198
TA(C)
PD(mW)
TA(C)
PD(mW)
50
440
110
176
60
396
115
154
PD (mW)
70
352
120
132
80
308
125
110
85
286
130
88
90
264
135
66
95
242
140
44
100
220
150
0
Power Dissipation Curve
600
500
400
300
200
100
0
-40 0
(2) SOT89-5
TA (C)
PD (mW)
TA (C)
PD (mW)
25
800
105
288
25
50
640
110
256
50
60
576
115
224
PD (mW)
70
512
120
192
75
75
480
125
160
100
125
105
80
448
130
128
85
416
135
96
150
TA (oC)
90
384
140
64
95
352
145
32
100
320
150
0
Power Dissipation Curve
900
800
700
600
500
400
300
200
100
0
0
25
50
75
-40
AH2984
Document number: DS31698 Rev. 4 - 2
100
125
105
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150
TA (°C)
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AH2984
Ordering Information
(Note 9)
AH2984 - X G - X
Device
AH2984-PG-B
AH2984-YG-13
Note:
Package
Green
Packing
P : SIP-4L
Y : SOT89-5L
G : Green
B : Bulk
13 : Tape & Reel
Package
Code
Packaging
(Note 9)
Quantity
P
Y
SIP-4
SOT89-5
1000
NA
Bulk
Part Number
Suffix
-B
NA
13” Tape and Reel
Part Number
Quantity
Suffix
NA
NA
2500/Tape & Reel
-13
9. For packaging details, go to our website at http://www.diodes.com/products/packages.html
Marking Information
(1) SIP-4
(Top View)
Part Number
Y : Year : 0~9
WW : Week : 01~52, "52" represents
52 and 53 week
X : Internal Code : A~Z : Green
2984
Y WW X
(2) SOT89-5
(Top View)
4
7
5
XX Y W X
1
AH2984
Document number: DS31698 Rev. 4 - 2
2
3
XX : Identification code
Y : Year : 0~9
W : Week : A~Z : 1~26 week;
a~z : 27~52 week;
z represents 52 and 53 week
X : Internal code
A~Z : Green
Device
Package
Identification Code
AH2984
SOT89-5
K1
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AH2984
Package Outline Dimensions (All dimensions in mm.)
(1) Package type: SIP-4L
x
2
1
a
L
︵ ︶
c
A
S
x
2
2
a
x
2
°
5
4
x
3
.
0
︵
︶
︵ ︶
1
b
2
b
E
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x
2
1
e
F
1
L
AH2984
4
a
x
2
3
a
J
D
︵ ︶
︵ ︶
SIP-4
Dim
Min
Max
Typ
A
1.45
1.65
1.55
b1
0.38
0.44
0.40
b2
—
—
0.48
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
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
December 2013
© Diodes Incorporated
AH2984
Package Outline Dimensions (All dimensions in mm.)
(2) Package type: SOT89-5L
1
D
C
0
0
2
.
0
R
L
H
E
L
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
B
1
B
e
x
4
°
8
︵
︶
A
1.24/1.44
0.73/0.87
D
AH2984
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AH2984
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 Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document 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 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.
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 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
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