US79 Series
CMOS Power Hall IC
Features and Benefits
ESD Tolerance IC>7,000V
ESD Tolerance of Fan >15,000V
Built-in Reverse Voltage Protection
Built-in RFI Filter
Power Efficient CMOS and Power MOSFET Drivers allow 400mA without overheating
Built-in Zener Diodes Protect Outputs
Eliminates all Fan Components
Eliminate PC Board
5V and 12V Operation
High Sensitivity for switching symmetry
Locked Rotor Shutdown
Applications
Fan Sizes up to 90mm
Current Range up to 400mA
Ordering Information
Part No.
US79
US79
Temperature Suffix
K
K
Package
UA
8-Pin Narrow SOIC
Temperature Range
-40
o
C to 125
o
C
-40
o
C to 125
o
C
Functional Diagram
Description
The US79KUA is the most advanced Smart Fan
Control Hall IC. It is designed for 5V and 12V cooling
commutation. The chip contains many features to
allow survival in a harsh environment. The IC was
designed to eliminate all discrete components such
as capacitors, resistors, transistors, diodes, PC
board and associated labor, replacing US$0.25 to
US$0.35 in direct cost.
The K rating guarantees proper operation up to an
ambient temperature of 125°C. Hall IC circuitry and
power FET output provide a low power dissipation
cool chip.
-
Voltage
Regulator
Control and
Protection
Hall Latch
+
1
Output 1
2
GND
3
Output 2
Locked Rotor conditions are detected by the IC when
there is no motion for one second and will shut off
the motor drive for five seconds. Then, the IC will
turn on the drive current for one second. This
sequence continues indefinitely until the locked rotor
condition is fixed. This feature prevents overheating.
Maximum ambient temperature is determined by
driver power dissipation. For instance, at 125C
ambient, driver power cannot exceed 125mW or
250mA. Future versions will offer optional features.
MLX902xx Name of Sensor
IC
US79 CMOS Power Hall
Rev Y.X
Rev 3.0
22/Aug/98
23/Jan/01
Page
Page 1
1
US79 Series
CMOS Power Hall IC
US79 Electrical Specifications
DC operating parameters: T
A
= 25 to 125
o
C, V
DD
= 5.0 to 12V unless otherwise specified.
Parameter
Supply Voltage
Supply Current
Output leakage
Output voltage
Output Saturation voltage
Output Saturation voltage
Output On resistance
Thermal resistance
V
DD
I
DD
I
LEAK
V
OUT
V
DSS
V
DSS
R
DDSS
R
th
Test Conditions
Operating
Operating
B<B
OP
B<B
HYS
I
OUT
= 150mA, V
DD
= 12V
I
OUT
= 350mA, V
DD
=12V
V
DD
= 12V
Operating
Min
3.7
1.2
-
-
Typ
-
2.0
1
-
400
800
1.34
Max Units
18
4
10
35
600
1100
200
V
mA
µA
V
mV
mV
Ω
°C/Watt
US79 Magnetic Specifications
DC operating parameters: T
A
= 25 to 125
o
C, V
DD
= 5.0 to 12V unless otherwise specified. 1 mT = 10 Gauss.
Parameter
Operate Point
Release Point
Hysteresis
General Description
Symbol
B
OP
B
RP
B
HYS
Test Conditions
Operating
Operating
Operating
Min
Typ
3.0
Max Units
6.0
-
mT
mT
mT
-6.0
-
-3.0
6.0
The US79 eliminates 16 solder joints, protects
against ESD, filters RFI emission caused by
switching of high currents, protects against voltage
surges, protects against locked rotor, operates at a
low temperature and is manufactured in an
Automotive IC factory.
The IC tolerates >7000V ESD. When installed in the
fan, the windings increase the ESD tolerance to
>15000V eliminating the need for ESD concerns in
the finished fan. Reverse Voltage protection is
provided by the motor windings. The IC contains
slew rate control on the output drivers to eliminate
RF emissions. 35V Zener diodes clamp the output
drivers for overstress protection.
Unique Features
Reverse voltage protection eliminates the need for a
diode. Reverse current flows through the coils and
the chip. Power dissipation is (2 * Istall/start * 0.7V).
Table 1 presents max temperature for each current.
Application Comments
EMC protection is built in. EMC considerations
require that the fan assembly should tolerate ESD,
reverse voltage, over voltage and not radiate RF
noise which may interfere with other electronic
equipment. These capabilities are built in to the chip
to meet EMC requirements.
Table 1
I
stall
/ I
start
100mA
200mA
300mA
400mA
US79 CMOS Power Hall IC
Qualification Test Results
T
A
Maximum Rev V Test
125°C
100°C
70°C
40°C
Rev 3.0
23/Jan/01
Page 2
SOA (Safe Operating Area) tests to verify inductive
switching of 500mA @ 20V. 1000 pieces tested 100
cycles each. Operating Life Test at TA = 150C for
4000 hrs. 100pc. “0” failures. Package qualified to
QS900 automotive PPAP specifications.
US79 Series
CMOS Power Hall IC
US79KA Applications Schematic
5V,12V
Supply
US79KA Applications
Schematic for Currents
Greater Than 500mA
VDD
+12V, +24V
Motor
Coil
US79
Motor
Coil
US79
500Ω
500Ω
Output 1
Output 2
P-Channel FET
P-Channel FET
US79 Hall Plate / Chip Location
Absolute Maximum Ratings
Supply Voltage (Over Voltage), V
DD
Output Current (Fault), I
OUT
Operating Temperature Range, T
A
Storage Temperature Range, T
S
Maximun Junction Temp, T
J
ESD Sensitivity
18V
500mA
-40 to 125°C
-55 to 165°C
150°C
+/- 7KV
U79 *
905
2.13
1.87
0.45
0.41
1.53
1.27
Marked
Surface
All Dimensions in millimeters
* MARKING:
Line 1:
1st digit (U)
2nd and 3rd digits (79)
Line 2:
1st digit (9)
2nd and 3rd digits(05)
= Supplier (Melexis)
= Series (79xx)
= Year (1999)
= Week of Year
1
2
3
PINOUT:
Pin 1
Pin 2
Pin 3
Output 1
GND
Output 2
Melexis Inc. reserves the right to make changes without further
notice to any products herein to improve reliability, function or
design. Melexis does not assume any liability arising from the use
of any product or application of any product or circuit described
herein.
MLX902xx Name of Sensor
IC
US79 CMOS Power Hall
Rev Y.X
Rev 3.0
22/Aug/98
23/Jan/01
Page
Page 3
3
US79 Series
CMOS Power Hall IC
UA Package Dimensions
1.60
1.40
4.30
3.90
2.64
2.34
45
o
Typical
For the latest version of this document,
Go to our website at:
www.melexis.com
Or for additional information, contact Melexis directly:
5
o
Typical
0.84
0.63
USA
Melexis Inc.
41 Locke Road, Concord, NH 03301
Phone: +1 603 223 2362
E-mail: sales_usa@melexis.com
Fax: +1 603 223 9614
U79 *
905
0.48
0.43
3.20
2.80
45
Typical
o
1.75
1.55
0.38
Typical
(see note 3)
United Kingdom
Silicon Concepts
PCB Lynchborough Road, Hampshire GU30 7SB, United Kingdom
Phone: +44 1428 751 617
Fax: +44 1428 751 603
E-mail: sales_uk@melexis.com
0.20
0.00
0.41
0.35
1
2
3
NOTES:
1.) Controlling dimension: mm
2.) Leads must be free of flash and
plating voids
3.) Leads must not arc toward
the rear of package
4.) Lead frame material:
EFTEC 64T
5.) Molding compound:
Sumitomo EME 6300H
6.) Package dimensions exclude
molding flash
7.) Tolerance is 0.254mm unless
otherwise specified
2.57
2.51
0.41
0.35
Germany
11.0
10.0
Am Seestern 8, 40547 Düsseldorf, Germany
Phone: +49 211 5360212
Fax: +49 211 5360250
E-mail: sales_de@melexis.com
France
Melexis France
Tour Arago, 5 rue Bellini, 92806 Puteaux-La-Défense, France.
Phone: +33 1 47 78 11 34
Fax: +33 1 47 78 06 35
E-mail: sales_france@melexis.com
1.30
1.24
Italy
Dimacred IRL
Via Papa Giovanni X XIII no. 25, 20046 Biassono, Italy
Phone: +39 039 249 4856
Fax: +39 039 491773
E-mail: sales_italy@melexis.com
Japan
Satori Electric Co., LTD
1-14-10 Shiba, Minato-Ku, Tokyo, Japan
Phone: +81 3 3452 7171
Fax: +81 3 3769 2197
E-mail: sales_japan@melexis.com
Taiwan
8-Pin Narrow SOIC
Package Dimensions
8
7
6
5
Beechwood Int’l Taiwan Co.
Room 8, 17F, No. 189, Taipei, Taiwan
Phone: +886 2 2739 3322
E-mail: sales_taiwan@melexis.com
Fax: +886 2 2739 3090
US79SO
0012
1
2
3
4
3.81
3.99
5.79
6.20
0.38
1.27
0.33
0.51
1.27
0
o
to 8
o
Notes:
1. Measurements in millimeters.
2. Body dimensions do not include mold flash,
protrusions, or burrs - not to exceed 0.15mm .
3. Lead frame material: copper 194.
4. Tolerances: +/- 0.25 mm unless otherwise
indicated.
5. Pin Connections:
1
2
3
4
5 to 8
n/c
Out1 VSS Out2 n/c
4.80
4.95
1.47
1.73
0.010 min.
US79 CMOS Power Hall IC
Rev 3.0
23/Jan/01
Page 4
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