US4881 Datasheet, PDF (1/6 Pages) Micro Electronics – CMOS Low Voltage High Sensitivity Latch

US4881
CMOS Low Voltage High Sensitivity Latch
Preliminary Datasheet
Features and Benefits
• Chopper stabilized amplifier stage
• Optimized for BDC motor applications
• New miniature package / thin, high reliability package
ry • Operation down to 2.2V
• CMOS for optimum stability, quality, and cost
a _{• Low IDD current}
in _Applications
lim ^{• Solid state switch}
• Brushless DC motor commutation
• Speed sensing
Pre ^{Ordering Information}
Part No.
Temperature Suffix Package
Temperature Range
US4881
E
SO or UA
-40 to 85^oC Extended
US4881
L
SO or UA
-40 to 150^oC Automotive
Contact factory or sales representative for legacy temperature code options
Functional Diagram
V_DD
Voltage
Regulator
Chopper
Output
UA Package
Pin 1 - V _{D D}
Pin 2 - GND
Pin 3 - Output
GND
SO Package
Pin 1 - V_{D D}
Pin 2 - Output
Pin 3 - GND
Description
The US4881 is a bipolar Hall effect sensor IC fab-
ricated from mixed signal CMOS technology. It
incorporates advanced chopper stabilization tech-
niques to provide accurate and stable magnetic
switch points. There are many applications for
this HED in addition to those listed above. The
design specifications and performance have been
optimized for commutation applications in brush-
less DC motors and automotive speed sensing.
The output transistor will be latched on (B_OP) in
the presence of a sufficiently strong South pole
magnetic field facing the marked side of the pack-
age. Similarly, the output will be latched off (B_RP)
in the presence of a North field.
The SOT-23 device is 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.
Note: Static sensitive device; please observe ESD precautions. Re -
verse V_DD protection is not included. For reverse voltage protec -
tion, a 100Ω resistor in series with V_DD is recommended.
US4881 CMOS Low Voltage High Sensitivity Latch
3901004881 Rev 1.5
24/July/01
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