US4881

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 Operation down to 2.2V CMOS for optimum stability, quality, and cost Low IDD current Applications Solid state switch Brushless DC motor commutation Speed sensing Ordering Information Part No. US4881 US4881 Temperature Suffix Package Temperature Range E SO or UA -40 to 85oC Extended L SO or UA -40 to 150oC Automotive Contact factory or sales representative for legacy temperature code options ry a in im l re P Functional Diagram Description The US4881 is a bipolar Hall effect sensor IC fabricated from mixed signal CMOS technology. It incorporates advanced chopper stabilization techniques 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 brushless DC motors and automotive speed sensing. The output transistor will be latched on (BOP) in the presence of a sufficiently s trong South pole magnetic field facing the marked side of the package. Similarly, the output will be latched off (BRP) in the presence of a North field. SO Package Pin 1 - VD D Pin 2 - Output Pin 3 - GND V DD Output Voltage Regulator Chopper GND UA Package Pin 1 - V D D Pin 2 - GND Pin 3 - Output The SOT-23 device is reversed from the UA package. The SOT-23 output transistor will be latched on (BOP) 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 VDD protection is not included. For reverse voltage protec tion, a 100 Ω resistor in series with VDD is recommended. US4881 CMOS Low Voltage High Sensitivity Latch 3901004881 Rev 1.5 24/July/01 Page 1 US4881 CMOS Low Voltage High Sensitivity Latch US4881 Electrical Specifications DC operating parameters: TA = 25oC, VDD = 12VDC (unless otherwise specified). Parameter Supply Voltage Supply Current Saturation Voltage Output Leakage Output Rise Time Output Fall Time Symbol Test Conditions VDD Operating IDD VDS(on) IOFF tr tf BBOP B