3901004881
Page 1
Sep/02
Rev. 008
Ordering Information
Part No.
Temperature Suffix
Package Code
US4881
E (-40C to 85C)
SO (SOT-23) or UA (TO-92)
US4882
E (-40C to 85C)
SO (SOT-23) or UA (TO-92)
US4882
L (-40C to 150C)
SO (SOT-23) or UA (TO-92)
Contact factory or sales representative for legacy temperature code options
Note: Static sensitive device; please observe ESD precautions.
Reverse V
DD
protection is not included. For reverse voltage
protection, a 100
resistor in series with V
DD
is recommended.
Description
The US4881/4882 are bipolar Hall effect sensor
IC's
fabricated
from
mixed
signal
CMOS
technology. Each incorporates advanced chopper
stabilization techniques to provide accurate and
stable magnetic switch points. The design
specifications
and
performance
have
been
optimized
for
commutation
applications
in
brushless DC motors and automotive speed
sensing.
The output transistor of the 4881 will be latched on
(B
OP
) in the presence of a sufficiently strong South
magnetic field facing the marked side of the
package. Similarly, the output will be latched off
(B
RP
) in the presence of a North field.
The output transistor of the 4882 will switch on
(B
OP
) near or after the South to North zero crossing
transition of a multipole ring magnet field facing the
marked side of the package. The output will switch
off (B
RP
) near or after the zero crossing transition
from South to North Field.
The SOT-23 device is magnetically reversed from
the UA package. The SOT-23 output transistor will
be latched on (B
OP
) in the presence of a sufficiently
strong North pole magnetic field subjected to the
marked face.
Features and Benefits
Chopper stabilized amplifier stage
Optimized for BDC motor applications
New miniature package / thin, high
reliability package
Operation down to 2.2V
CMOS for optimum stability, quality,
and cost
Low I
DD
current
Applications
Solid state switch
Brushless DC motor commutation
Speed sensing
Functional Diagram
3901004881
Page 2
Sep/02
Rev. 008
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.
Note: 1 mT = 10 Gauss.
US4881 and US4882 Electrical Specifications
DC operating parameters: T
A
= 25
o
C, V
DD
= 12V
DC
(unless otherwise specified).
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Supply Voltage
V
DD
Operating
2.2
18
V
Supply Current
I
DD
B<B
OP
1.5
2.0
5.0
mA
Saturation Voltage
V
DS(on)
I
OUT
= 20 mA, B>B
OP
0.4
0.5
V
Output Leakage
I
OFF
B<B
RP
, V
OUT
= 18V
0.01
5.0
A
Output Rise Time
t
r
V
DD
= 12V, R
L
= 1.1K
, C
L
= 20pf
0.04
s
Output Fall Time
t
f
V
DD
= 12V, R
L
= 1.1K
, C
L
= 20pf
0.18
s
US4881 Magnetic Specifications
Parameter
Symbol Test Conditions
Min
Typ
Max
Units
Operating Point
B
OP
E/L UA, E/L SO, Ta= 25
Vdd=2.2 & 18 volts DC Vdd
0.5
2.0
4.5
mT
Release Point
B
RP
E/L UA, E/L SO, Ta= 25
Vdd=2.2 & 18 volts DC Vdd
-4.5
-2.0
-0.5
mT
Hysteresis
B
hys
E/L UA, E/L SO, Ta= 25
Vdd=2.2 & 18 volts DC Vdd
1.5
4.0
5.0
mT
Operating Point
B
OP
EUA, ESO, Ta= 85
Vdd=2.2 & 18 volts DC Vdd
-1.0
2.0
6.0
mT
Release Point
B
RP
EUA, ESO, Ta= 85
Vdd=2.2 & 18 volts DC Vdd
-6.0
-2.0
-1.0
mT
Hysteresis
B
hys
EUA, ESO, Ta= 85
Vdd=2.2 & 18 volts DC Vdd
1.5
4.0
5.5
mT
3901004881
Page 3
Sep/02
Rev. 008
Absolute Maximum Ratings
Supply Voltage (Operating), V
DD
18V
Supply Current (Fault), I
DD
50mA
Output Voltage, V
OUT
18V
Output Current (Fault), I
OUT
50mA
Power Dissipation, P
D
100mW
Operating Temperature Range, T
A
-40 to 150C
Storage Temperature Range, T
S
-65 to 150C
Maximum Junction Temp, T
J
175C
US4882 Magnetic Specifications
Parameter
Symbol Test Conditions
Min
Typ
Max
Units
Operating Point
B
OP
E/L UA, E/L SO, Ta= 25
Vdd=2.2 & 18 volts DC Vdd
-2.0
2.0
6.0
mT
Release Point
B
RP
E/L UA, E/L SO, Ta= 25
Vdd=2.2 & 18 volts DC Vdd
-6.0
-2.0
2.0
mT
Hysteresis
B
hys
E/L UA, E/L SO, Ta= 25
Vdd=2.2 & 18 volts DC Vdd
3.0
4.0
5.0
mT
Operating Point
B
OP
EUA, ESO, Ta= 85
Vdd=2.2 & 18 volts DC Vdd
-3.0
2.0
6.0
mT
Release Point
B
RP
EUA, ESO, Ta= 85
Vdd=2.2 & 18 volts DC Vdd
-6.0
-2.0
-3.0
mT
Hysteresis
B
hys
EUA, ESO, Ta= 85
Vdd=2.2 & 18 volts DC Vdd
2.0
4.0
5.5
mT
Operating Point
B
OP
LUA, LSO, Ta=150C,
Vdd=2.2 & 18 volts DC Vdd
-3.5
2.0
6.0
mT
Release Point
B
RP
LUA, LSO, Ta=150C,
Vdd=2.2 & 18 volts DC Vdd
-6.0
-2.0
3.5
mT
Hysteresis
B
hys
LUA, LSO, Ta=150C,
Vdd=2.2 & 18 volts DC Vdd
1.0
4.0
5.5
mT
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