10814NK 20131203-S0000 1 No.A2264-1/5
Semiconductor Components Industries, LLC, 2014
January, 2014
http://onsemi.com
LA6581DM
Overview
The LA6581DM is a low-saturation BTL output linear
driving motor driver for single-phase bipolar fan motors.
It features quite, low power, high efficiency drive that
suppresses reactive current. It is optimal for use in
applications that require miniaturization and low noise,
such as CPU cooling fan motors and 5 to 12V electronic
game products.
Functions
• Single-phase full-wave linear drive with BTL output (gain resistance 500Ω to 284kΩ, 55dB) : Suitable for the
equipment requiring silent operation, such as game equipment, CPU cooler, etc. because of its freedom from
switching noise.
• Low-voltage ope rat i o n possible, with wide operable voltage ran ge (2 .2 to 16 V)
• Low saturation output (Upper + lower saturation voltage : VOsat (total) = 0.3V typ, IO = 100mA) : High coil
efficiency with low current drain. IC itself does not generate much heat.
• High impedance of Hall input pin
• FG output (rot at ion speed detecti on output : open collecto r output)
• Heat protection circuit : When the large current flows beca use of output short-circ uit, raising the IC chi p temperature
above 180°C, the heat protection circuit suppresses the drive current, preventing IC burn and break down.
• Extra-small package (Micro8)
Small substrate while allowing larger blades
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Output voltage VCC max 18 V
Allowable power dissipation Pd max Mo u n t e d o n a s p e c i f i e d b o a r d *1 400 mW
Output current IOUT1 max *2 0.36 A
IOUT2 max T<200ms 0.50 A
Output withstand voltage VOUT max 18 V
FG output withstand VFG max 18 V
FG output current IFG max 5mA
Operating temperature Topr -30 to +100 °C
Storage temperature Tstg -55 to +150 °C
*1: Mounted on a board (20.0mm10.0mm0.8mm: Paper Phenol, wiring density 20%)
*2: This specifies the starting current. Tj=15°C max must not be exceeded..
Caution 1) Absolute maximum ratings represent the value which cannot be exceeded for any length of time.
Caution 2) Even w hen the device is u sed within the range of absolu te max imum ratings, as a resu lt of co ntinuous usage under high temperature , high cu rrent,
high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please contact us for the further details.
Orderin
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numbe
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: ENA2264
Monolithic Linear IC
Fan Motor Driver
BLT Driver Single-Phase
Full-Wave
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating
C onditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.
ORDERING INFORMATION
See detailed orderin
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and shi
pp
in
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information on
p
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g
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Micro8
LA6581DM
No.A2264-2/5
Recommended Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Supply voltage VCC 2.2 to 16 V
Common-phase input voltage range of
Hall input VICM 0.3 to VCC-1.5 V
Electrical Characteristics at Ta = 25°C, VCC = 12.0V, unless especially specified.
Parameter Symbol Conditions Ratings Unit
min Typ Max
Circuit Current ICC IN- = 5.8V , IN+ = 6.0V, RL =
∞
14 19 mA
OUT output low voltage VOL I
O = 100mA 0.1 0.2 V
OUT output high voltage VOH I
O = 100mA 0.1 0.2 V
Hall bias voltage VHB RH = 360Ω +91Ω 1.85 1.95 2.05 V
Hall amplifier gain Vg 52 55 58 dB
Hall amplifier input current VINR -10 -2 +10 μA
FG output low voltage VFG I
FG = 3mA 0.2 0.3 V
FG output leakage current IFGL V
FG = 7V 30 μA
Thermal protection circuit Th * Design guarantee 150 180 200 °C
*: These values are design guarantee values, and are not tested.
Truth Table
IN- IN+ OUT1 OUT2 FG mode
H L H L L During rotation
L H L H Off
- - Off Off - During overheat protection
Pd-Ta
90 120
0
500
400
300
200
100
Pd max -- Ta
160
With specified board
LA6581DM
No.A2264-3/5
Package Dimensions
unit : mm (typ)
Micro8
CASE 846A-02
ISSUE J
Pin Assignment
1IN+
2HB
3
4OUT1
8
7
6
5
FG
VCC
OUT2
GND
Micro8
Top view
LA6581DM
No.A2264-4/5
Block Diagram
2.0VRG
HB
OUT1 OUT2
FG
IN+
IN-
GND
VCC
H
Timing Chart
Hall Signal
OUTPUT
Coil Current
FG Pulse
LA6581DM
PS No.A2264-5/5
Application Circuit Example
*1 : When Di to prevent breakdown in case of reverse connection is used, it is necessary to insert a capacitor Cr to
secure the regenerative current route. Similarly, Cr is necessary to enhance the reliability when there is no
capacitor near the fan power line.
*2 : To obtain Hall bias from VCC, carry out 1/2 × VCC bias as shown in the figure. Linear driving is made through
voltage control of the coil by amplifying the Hall output. When the Hall element output is large, the startup
performance and efficiency are improved. Adjustment of the Hall element can reduce the noise further.
*3 : When the Hall bias is taken from the HB pin, constant-voltage bias is made with about 2.0V. Therefore, the Hall
element can provide the output satisfactory in temperature characteristics. Adjustment of the Hall output
amplitude is made with R1. (When VCC = 12V, the step *2 above proves advantageous fo r IC heat ge n e rat i on.)
*4 : Keep this open when not used.
*5 : When the wiring from the Hall output to IC Hall input is long, noise may be carried through the wiring.
In this case, insert the capacitor as shown in the figure.
ORDERING INFORMATION
Device Package Shipping (Qty / Packing)
LA6581DMR2G Micro8
(Pb-Free / Halogen Free) 4000 / Tape & Reel
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GND
VCC
FG
OUT1
OUT2IN+
HB
*1
Di Cr
*2
R2 *3
IN+
HB
*5
*4
R1
R2
HH
LA6581DM
Elements in substrate