Melexis MLX90285LDCAAA-000RE 24v low noise two-coil fan driver Datasheet

MLX90285
24V Low Noise Two-Coil Fan Driver
Features and Benefits






Applications

1-chip solution (Hall element + Output Drivers)
Soft Switching for low noise
Two-Stage Thermal Protection
Locked Rotor Protection and auto-restart
FG and RD available in 4-pin VK (“No-VDD” design)
Pin-to-pin compatible with US90A & US91A
24V Two-Coil motors
Ordering Code
Product Code
MLX90285
MLX90285
MLX90285
MLX90285
Temperature Code
L
L
L
L
Legend:
Temperature Code:
Package Code:
Package Code
VK
VK
DC
DC
Option Code
ABA-000
AAA-000
ABA-000
AAA-000
Packing Form:
L for Temperature Range -40°C to 150°C
VK for Plastic Single in Line ,
DC for SOIC8 (AECQ100 compliant)
AAA-000 for Frequency Generation (FG),
ABA-000 for Rotation Detection (RD)
BU for Bulk, RE for Reel (live bug)
Ordering example:
MLX90285LVK-ABA-000-BU
Option Code:
1 Functional Diagram
Packing Form Code
BU
BU
RE
RE
2 General Description
The MLX90285 is a one-chip solution for driving two-coil
brushless DC cooling fans.
The device features Soft Switching to lower acoustic and electrical
fan noise. This efficient solution is enhanced with an intelligent
Active Slope Control which automatically adjusts the slope
duration depending on the fan rotation speed. Thus, the fan
performance to noise ratio is always kept optimum without the
need of tuning via external component.
The device includes a novel Two-Stage Thermal Protection as well
as Locked Rotor Protection for demanding application
safety requirements.
Frequency Generator or Rotation Detection is available. The
open-drain output makes the connectivity with any external
interface for hardware monitoring easier.
These features are combined with the Melexis patented no- VDD
design to fit the IC in small 4-pin VK package.
The device is also delivered in DC package for automatic
assembly.
3901090285
Rev. 005
Page 1 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
Table of Contents
1 Functional Diagram....................................................................................................................................... 1
2 General Description....................................................................................................................................... 1
3 Glossary of Terms.......................................................................................................................................... 3
4 Absolute Maximum Ratings .......................................................................................................................... 3
5 Application Information ................................................................................................................................ 3
6 General Electrical Specifications .................................................................................................................... 4
7 Magnetic Specifications ................................................................................................................................ 5
8 Driver Output vs Magnetic Pole ..................................................................................................................... 5
9 Detailed General Description ......................................................................................................................... 5
10 Unique Features .......................................................................................................................................... 6
10.1 Active Soft Switching .................................................................................................................................................... 6
10.2 Best Performance to Noise compromise....................................................................................................................... 7
10.3 Two-Stage Thermal protection ..................................................................................................................................... 7
11 Performance Graphs.................................................................................................................................... 8
11.1 RDSON vs. TJ ..................................................................................................................................................................... 8
11.2 RDSON vs. VDD .................................................................................................................................................................. 8
11.3 Magnetic parameters vs. TJ .......................................................................................................................................... 8
11.4 Magnetic parameters vs. VDD ....................................................................................................................................... 8
11.5 IDD vs. TJ ......................................................................................................................................................................... 8
11.6 IDD vs. VDD ...................................................................................................................................................................... 8
11.7 VOL vs TJ ......................................................................................................................................................................... 9
11.8 Power dissipation vs. TA ................................................................................................................................................ 9
12 Standard information regarding manufacturability of
Melexis products with different soldering processes ....................................................................................... 10
13 ESD Precautions ........................................................................................................................................ 10
14 Packages Information (Outline Drawing, Hall Plate location & Pinout) ....................................................... 11
14.1 VK Package (4-pin TO92) ............................................................................................................................................ 11
14.2 DC Package (8-pin narrow SOIC) ................................................................................................................................ 12
15 Disclaimer ................................................................................................................................................. 14
3901090285
Rev. 005
Page 2 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
3 Glossary of Terms
Two-coil fan
MilliTesla (mT), Gauss
VDD
IDD
Peak output current
Continuous output current
Locked rotor
LFPM
A fan with two-coil windings where current alternates from 1 coil to the other
depending on the direction of the magnetic field.
Units of magnetic flux density :
1mT = 10 Gauss
Voltage on the coils common node.
Current supplying the chip which flows through the coil connected to the switched off
output driver.
The current flowing in the coil at start-up, only limited by the coil resistance RCOIL and
the output driver resistance R DSON.
The current flowing in the coil when the fan is spinning normally.
The state when the fan stopped spinning due to mechanical blockage.
Linear Feet Per Minute – Unit of airflow velocity
4 Absolute Maximum Ratings
Parameter
Symbol
Value
Units
Fan Supply Voltage (Continuous)
VDDcont
30
V
Fan Supply Voltage (Peak < 100 s)
VDDpeak
60
V
Output Current (Continuous)
IOUTcont
350
mA
Output Current (Peak)
IOUTpeak
700
mA
FG/RD Voltage
VFG/RD
28
V
FG/RD Output Current (sink)
IFG/RD
20
mA
Operating Junction Temperature Range
TJ
-40 to 150
C
Magnetic Flux Density
Table 1: Absolute maximum ratings
B
Unlimited
mT
Exceeding the absolute maximum ratings may cause permanent damage. Exposure to absolute-maximum-rated conditions
for extended periods may affect device reliability.
5 Application Information
At power-on, the FG/RD output is kept high for at least
500 s independently of the rotation status or magnetic
field. It prevents appearance of unexpected impulses or
oscillation on the FG/RD output signal due to broken coil
(i.e. open connection) or short connection between OUT1 or
OUT2 to ground.
A decoupling capacitor from 100nF or higher should be
placed between the VDD point (fan common node) and IC
ground. It reduces the risk of electrical over-stress damage
to ground bouncing when plugging/unplugging the fan
connector.
Typical two-coil fan application circuit
3901090285
Rev. 005
Speed control schemes using a transistor on the ground pin
are not recommended as it may damage the IC. Please
contact your nearest sales contact, if you require speed
control.
Page 3 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
6 General Electrical Specifications
DC Operating Parameters T J = 25°C, VDD = 24V (unless otherwise specified)
Parameter
Symbol
Fan Supply Voltage
(2)
Extended Operating Voltage
Supply Current
Power-On Reset Voltage
VDD
VDD
IDD
VPOR
Output Driver Resistance
RDSON
Output Clamping Voltage
FG / RD Output Low Voltage
FG / RD Output Clamp Voltage
FG / RD Output Leakage Current
Typical Rotation Speed Range
with Active Slope Control
VOUT 1,2
VOL
VCLAMP
ILEAK
ASLON
Test Conditions
Recommended Operating (average)
Fully Functional
Min
9.6
5
Typ
Max
Units
30
30
4
V
V
mA
V
3
5
80
500
10
ohms
ohms
V
mV
V
µA
6700
RPM
6.25
10
%
10
%
sec
sec
(1)
2
1.8
2
3
VDD = 5V
60
IOL = 10mA
250
28
VFG (VRD) = 18V
VDD = 12 to 24V
2-pole pair rotor magnet
VDD = 12 to 24V
2300
Output Slope Duration To Torque
(3, 4)
Period Ratio
SLRATIO
Locked Rotor Period
Locked Rotor Period
(5)
Thermal Protection Level1 ON
TON
TOFF
TSD1ON
4.2
0.43
2.6
140
Thermal Protection Level1 OFF
Thermal Protection Level2 ON
TSD1OFF
TSD2ON
120
160
C
C
Thermal Protection Level2 OFF
TSD2OFF
RTH-ja
140
150
C
One-sided PCB, zero LFPM
One-sided PCB, zero LFPM
50
200
DC Thermal Resistance
RTH-jc
RTH-ja
VK Thermal Resistance
VDD = 5V
RTH-jc
Table 2: General electrical specifications
70
C
C/W
1
The minimal value of VDD should be determined using the following equation: VDD = 9.6V + RCOIL * IDD
The extended operating voltage is the range in which the device is able to start-up properly (down to 5V) with full functionality of the device (including basic
function like magnetic field sensing, FG output, Locked Rotor protection,...) with potential deviation versus normal operating conditions
3
The SLRATIO is defined as the ratio of the slope duration over the motor torque period, equal to the half of the electrical output period T of OUT1 or OUT2 :
2
SLRATIO
4
5
tSLOPE
TM
2
tSLOPE
TOUT
Within ASLON range, slope measured from VDSon to 100% VDD
Output Slope Duration reduced to half its normal value
3901090285
Rev. 005
Page 4 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
7 Magnetic Specifications
DC Operating Parameters T J = 25°C, VDD = 5 to 30V (unless otherwise specified)
Parameter
Symbol
Operate point
BOP
Release point
BRP
Hysteresis
BHYST
Table 3: Magnetic specifications
Min
0.5
-6
2
Typ
3
-3
6
Max
6
-0.5
Units
mT
mT
mT
OUT1
High
Low
OUT2
Low
High
8 Driver Output vs Magnetic Pole
Parameter
Test Conditions
North pole
B < Brp – all packages
South pole
B > Bop - all packages
(7)
Table 4: Driver output vs. magnetic pole
(6)
FG
High
Low
9 Detailed General Description
The MLX90285 is a one-chip solution for driving two-coil brushless DC cooling fans.
Based on mixed-signal CMOS design, the device includes Hall-effect sensor with offset cancellation scheme, voltage
regulator, digital logic and power output drivers in a single package.
The MLX90285-FG version has an open-drain tachometer FG output that follows the Hall signal. This signal is used by
hardware monitoring system to determine the rotation speed of the fan.
In the MLX90285-RD version, the open-drain alarm output RD is a safety signal which allows detecting if the fan rotates or
not. It is active low during normal spinning of the motor. It goes high when the magnetic flux switching frequency drops
below nearly 1.15Hz (35RPM for 2 pole-pair fan)
The built-in locked rotor protection automatically shuts off the coil current when the rotor is mechanically blocked for more
than 0.43 second. The fan tries to restart every 3 seconds until the rotor is released. This on/off cycling reduces the average
current by factor of about 7. This protection prevents the fan to be overheated or damaged.
The device is based on the Melexis patented “no-VDD” design which removes the need of separate supply voltage pin for
two-coil fan. During operation, the power outputs are always operating as complementary, meaning also that one power
output is kept inactive while the other is active. Melexis cleverly turned this fact into benefit as “No-VDD” devices such as
MLX90285 recover the power supply through the inactive power output pin. Therefore, a separate supply voltage pin is not
required anymore and the device including logical output FG/RD can fit into a small 4-pin through-hole package VK.
In the application, the “No-VDD” design inherently isolates the IC behind the fan coils. Without direct output to the external
environment, the device is best protected against ESD and over-voltage issue on the power supply voltage line.
6
7
FG state is only valid during normal operation. In locked rotor protection, FG signal is high
The magnetic pole is applied facing the branded side of the package
3901090285
Rev. 005
Page 5 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
10 Unique Features
10.1 Active Soft Switching
The use of the Melexis Soft Switching techniques in the US168/169 and US651/661 has already proven its efficiency to
noticeably reduce electrical and acoustic noise by precisely control the output slope duration on the fan coil. The US168/168
is the first generation with fixed output slope duration and the US651/661 is the second generation with possibility for the
user to fine-tune the slope duration via an external pin.
The MLX90285 represents the third generation of soft switching device as it goes even a step further into intelligence and
smart driving.
It mainly combines the major advantage of each previous generation:
Adjustable Slope Control  best balance between motor performance and acoustic/electrical noise
No need of external component for slope control  cost efficiency and simplicity
“Adjustable without external component” is possible as the device automatically determine the slope duration depending on
the fan rotation speed.
The MLX90285 determines the fan rotation speed by measuring the half output switching period from the magnetic field
signal. The output slope duration is extrapolated by measuring the duration from the falling edge on OUT1 to the cross over
with OUT2.
The result is processed to determine the actual Output Slope Duration to Torque Period Ratio (SLRATIO = 2 . tSLOPE / TOUT ),
leading to two possible options:
If SLRATIO < 6.25% (typical), the slope duration should be increased
If SLRATIO > 6.25% (typical), the slope duration should be decreased
The Digital Slope Duration Control register is incremented or decremented accordingly, thus updating the slope duration
value for both outputs OUT1 and OUT2, prior the next rising slope occurring on OUT1.
Magnetic Field
at Hall sensor
(from rotor magnet)
Digital Magnetic Field
(North or South)
BOP
BRP
½ . TOUT1
= ½ . 7.5ms = 3.75ms
VOUT1
VOUT2
Output Voltage
OUT1 slope duration
measurement signal
Slope Duration to
Output Switching
Period Ratio register
Digital Slope Duration
Control register
( 1 N 96 )
Output
crossover
½ tSLOPE
= 0.15ms
½ tSLOPE
= 0.145ms
SLRATIO comparison + decision
= 0.3ms / 3.75ms = 8%

Slope duration must be decreased
N = N0 (= 53) 
tSLOPE = REF . N (= REF . 53 = 0.3ms)
tSLOPE = REF . (N0 - 1) (= REF . 52 = 0.29)
1 - All values in green are arbitrary and just given for example purpose
2 - Condition example: 4000RPM, 2-pole pair rotor magnet, initial slope
duration = 0.3ms, target SLRATIO = 6.25%
Picture 1 – Active Soft Switching Operation Principle
3901090285
Rev. 005
Page 6 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
The Slope Control provides smooth change in the coil current and allows reducing both electrical and acoustic noise.
In addition, the MLX90285 slope generation is processed upon reaching a precise magnetic threshold B OP/BRP. Unlike other
fan driver using the rotor magnetic field amplitude which might lead to difficulty in adequate rotor magnet magnetisation,
the Melexis solution provides best results with different fan size with weaker or stronger rotor magnet.
10.2 Best Performance to Noise compromise
The MLX90285 features a typical 6.25% ratio between slope duration over the torque period, proportional to the fan rotation
speed. This value is controlled to provide the best compromise between fan performance (rotation speed and current
consumption) and acoustic noise. Increasing this ratio mainly lowers the motor efficiency while decreasing this ratio removes
the low noise benefit.
SLRATIO
Output Slope Duration
Low Performance
408us
Performance
High Performance
Low Noise
6.25%
Acoustic Noise
Medium Performance
High Noise
140us
2300
2300
Rotation speed
(RPM)
Rotation speed
6700
6700
Picture 2 – Slope Duration to Torque Period Ratio effect
The device keeps this ratio constant within a large rotation speed range from 2300RPM to 6700RPM (2-pole pair fan).
Therefore, the device automatically adjusts its low noise specification to a given cooling application requirements.
10.3 Two-Stage Thermal protection
The use of soft switching through linear slope control leads to an increase of the IC junction temperature . As a result, using
long slope and high output current can result in reaching the thermal protection threshold and so shut off the device to
prevent overheating. In the application, it would stop a low noise cooling fan in an environment where cooling is a required
due to high temperature.
The MLX90285 is the first fan driver to integrate a Two-Stage Thermal Protection.
st
When the IC junction temperature exceeds a 1 thermal threshold TSD1 ON (140°C typical), the slope duration are
unconditionally divided to half the actual value. The immediate effect is a reduction of the average power dissipation, hence
it stabilizes or even starts reducing the IC junction temperature so the cooling fan continues rotating to provide airflow in a
system.
The slope duration is back to normal when the junction temperature decreases below TSD1 OFF (120°C typical).
However, in case the reduction of the slope duration is not enough to stop the junction temperature increase, the device has
nd
a 2 thermal threshold TSD2 ON (160°C typical) which then shuts-off the IC to prevent over-heating. All the outputs OUT1,
OUT2 and FG/RD goes to high level and stay in this state until the junction temperature decreases below TSD2 OFF (140°C
typical).
3901090285
Rev. 005
Page 7 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
11 Performance Graphs
11.1 RDSON vs. TJ
11.2 RDSON vs. VDD
6
6
5.5
5.5
5
5
4.5
4.5
4
Ron(ohms)
Ron (ohms)
4
3.5
3
2.5
3.5
3
2.5
2
2
1.5
1.5
Tj= -40○C
Tj= 25○C
Ron, VDD=5V
1
Tj= 150○C
1
Ron, VDD=24V
0.5
0.5
0
0
-40
-20
0
20
40
60
80
100
120
140
4
160
6
8
10
12
14
Tj (○C)
11.3 Magnetic parameters vs. TJ
18
20
22
26
28
30
28
30
6
5
5
4
4
3
Magnetic Field(mT )
3
2
1
0
-1
2
1
0
-1
Bop, Tj= -40oC
-2
-2
Bop, Tj= 25○C
Bop, Tj= 150○C
Brp, Tj= -40○C
Brp, Tj= 25○C
Brp, Tj= 150○C
-3
-3
Bop,VDD=5V
-4
-4
Bop,VDD=24V
Brp,VDD=5V
Brp,VDD=24V
-5
-5
-6
-6
-40
-20
0
20
40
60
80
100
120
140
4
160
6
8
10
12
14
16
18
20
22
24
26
VDD (Volts)
T j (○C)
11.5 IDD vs. TJ
11.6 IDD vs. VDD
4
4
3.5
3.5
3
3
2.5
IDD(mA)
2.5
IDD (mA)
24
11.4 Magnetic parameters vs. VDD
6
Magnetic Field(mT )
16
VDD (Volts)
2
2
1.5
1.5
1
1
IDD, Tj= -40○C
IDD, Tj= 25○C
IDD, VDD= 5V
0.5
0.5
IDD, VDD= 24V
0
IDD, Tj= 150○C
0
-40
-20
0
20
40
60
80
100
120
140
160
Tj (oC)
3901090285
Rev. 005
4
6
8
10
12
14
16
18
20
22
24
26
28
30
VDD (Volts)
Page 8 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
11.7 VOL vs TJ
11.8 Power dissipation vs. TA
1
DC - Rth=150degC/W - PDm ax=833m W
TA = 25degC
0.9
VK - Rth=200degC/W - PDm ax=625m W
400
0.8
Allowed power dissipation (W)
FG/RD pin Output Saturation Voltage,(mV)
500
300
200
VA - Rth=170 degC/W - PDm ax=735m W
0.7
0.6
0.5
0.4
0.3
100
0.2
Vdson, VDD=5V,Iol= 10mA
Vdson, VDD=24V,Iol= 10mA
TJ MAX = 150degC
0.1
0
0
-40
-20
0
20
40
60
80
100
120
140
160
-40
Tj (○C)
3901090285
Rev. 005
-20
0
20
40
60
80
100
120
140
160
T j (○C)
Page 9 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
12 Standard information regarding manufacturability of Melexis products with
different soldering processes
Our products are classified and qualified regarding soldering technology, solderability and moisture sensitivity level according
to following test methods:
Reflow Soldering SMD’s (Surface Mount Devices)
IPC/JEDEC J-STD-020
Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface Mount Devices
(classification reflow profiles according to table 5-2)
EIA/JEDEC JESD22-A113
Preconditioning of Nonhermetic Surface Mount Devices Prior to Reliability Testing
(reflow profiles according to table 2)
Wave Soldering SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)
EN60749-20
Resistance of plastic- encapsulated SMD’s to combined effect of moisture and soldering heat
EIA/JEDEC JESD22-B106 and EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Iron Soldering THD’s (Through Hole Devices)
EN60749-15
Resistance to soldering temperature for through-hole mounted devices
Solderability SMD’s (Surface Mount Devices) and THD’s (Through Hole Devices)
EIA/JEDEC JESD22-B102 and EN60749-21
Solderability
For all soldering technologies deviating from above mentioned standard conditions (regarding peak temperature,
temperature gradient, temperature profile etc) additional classification and qualification tests have to be agreed upon with
Melexis.
The application of Wave Soldering for SMD’s is allowed only after consulting Melexis regarding assurance of adhesive
strength between device and board.
Melexis is contributing to global environmental conservation by promoting lead free solutions. For more information on
qualifications of RoHS compliant products (RoHS = European directive on the Restriction Of the use of certain Hazardous
Substances) please visit the quality page on our website: http://www.melexis.com/quality.aspx
13 ESD Precautions
Electronic semiconductor products are sensitive to Electro Static Discharge (ESD).
Always observe Electro Static Discharge control procedures whenever handling semiconductor products.
3901090285
Rev. 005
Page 10 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
14 Packages Information (Outline Drawing, Hall Plate location & Pinout)
14.1 VK Package (4-pin TO92)
5.22+/-0.10
1.55+/-0.10
4.20+/-0.10
0.73+/-0.10
1. All dimensions are in millimeters
3.65+/-0.10
0.46
3°+2 (2X)
+2
-1
5°
2. Package dimension exclude molding flash.
Mold flash shall not exceed 0.127mm.
(2X)
3. To preserve reliability, it is recommended to
have total lead length equal to 2.5mm minimum,
measured from the package line.
+0.02
- 0.03
2.5 min
see note 3
1.42+/-0.10
0.00
0.20
4. VK package is a pin through-hole package,
hence adapted for wave soldering process.
A reflow soldering process is not recommended
with VK package as it may seriously affect
device reliability.
10.50+/-0.30
E.D.M Process Surface Ro1.6~2.4um
Notes:
Marking:
Top side :
1st Line = 285FG (or 285RD) – Part number
(MLX90285) and Option Code
2nd Line - xxyww – xx = Lot number
0.38+/-0.03
1.27+/-0.03
y = year (last digit)
0.38+/-0.03
ww = calendar week
3.81+/-0.03
+2
5° -1
(2X)
0.30+/-0.10
(2X)
3°+2
(2X)
Hall plate location
2.25+/-0.13
0.52
1.05+/-0.13
Notes:
1. All dimensions are in millimeters
Pin number (VK)
1
2
3
4
3901090285
Rev. 005
Pin Name
FG (RD)
OUT1
OUT2
GND
Function
FG (RD) open drain output signal
Open Drain Coil Driver 1
Open Drain Coil Driver 2
Ground pin
Page 11 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
14.2 DC Package (8-pin narrow SOIC)
Notes:
8
7
6
5
1. Controlling dimensions in millimeters.
+0.05
+0.21
5.99 - 0.15
see note 5
3.94 - 0.13
2. The appearance of pin 1 is optional, round type on single
leadframe and rectangular type on matrix leadframe.
3. Formed leads shall be planar with respect to one another
within 0.0792mm at seating plane.
Parting Line
4. Length of terminal for soldering to a substrate.
5. Package length and width are reference datums and do
not include mold flash or protrusions, but does include
mold mismatch and are measured at the mold parting
line.
+0.25
0. 64 - 0.23
+3
1
2
3
5° - 5
4
see note4
Mold flash or protrusions shall not exceed 0.1524mm at
end and 0.254mm at window.
DETAIL A
see note2
Addition
4.93
6. This part is compliant with JEDEC standard MS-012.
+0.05
- 0.13
Marking:
h x 45°
see note5
1.63- 0.08
+0.10
+0.08
1.47 - 0.07
Top side :
+0. 05
0.25- 0.06
1st Line = MLX285 – Part number (MLX90285)
2nd Line = FGyyww (or RDyyww) – Option Code
and Datecode
(yy -year
ww - calendar week)
+0.08
0. 41- 0.06
1. 27 BSC
3rd Line = xxxxxx – Lot number
Seating Plane
see note3
See DETAIL A
Marking on top side is duplicated on bottom side
Hall plate location
7
6
5
0.45
8
Notes:
1.9
2.0
1. All dimensions are in millimeters.
1
2
2.4
2.5
3
4
Package outline
Pin number (DC)
1
2
3
4
5, 6, 7, 8
3901090285
Rev. 005
Pin Name
FG (RD)
OUT1
GND
OUT2
-
Function
FG (RD) open drain output signal
Open Drain Coil Driver 1
Ground pin
Open Drain Coil Driver 2
Not Connected
Page 12 of 14
DataSheet
Aug/14
MLX90285
24V Low Noise Two-Coil Fan Driver
15 Disclaimer
Devices sold by Melexis are covered by the warranty and patent indemnification provisions appearing in its Term of
Sale. Melexis makes no warranty, express, statutory, implied, or by description regarding the information set forth
herein or regarding the freedom of the described devices from patent infringement. Melexis reserves the right to
change specifications and prices at any time and without notice. Therefore, prior to designing this product into a
system, it is necessary to check with Melexis for current information. This product is intended for use in normal
commercial applications. Applications requiring extended temperature range, unusual environmental requirements,
or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not
recommended without additional processing by Melexis for each application.
The information furnished by Melexis is believed to be correct and accurate. However, Melexis shall not be liable to
recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of
profits, loss of use, interrupt of business or indirect, special incidental or consequential damages, of any kind, in
connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or
liability to recipient or any third party shall arise or flow out of Melexis’ rendering of technical or other services.
© Melexis NV. All rights reserved.
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3901090285
Rev. 005
Page 13 of 14
DataSheet
Aug/14
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