US3881ESO

US3881 CMOS Low Voltage Hall Effect Latch 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 Applications • • • • • • Solid state switch Brushless DC motor commutation Speed sensing Linear position sensing Angular position sensing Current sensing Ordering Information Part No. US3881 US3881 Temperature Suffix Package Temperature Range E SO or UA -40oC to 85oC Commercial L SO or UA -40oC to 150oC Automotive * Contact factory or Sale Representative for legacy temperature options Functional Diagram Description The US3881 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 sensor in addition to those listed above. The design, specifications, and performance have been optimized for commutation applications in 5V and 12V brushless DC motors. The output transistor will be latched on (BOP) in the presence of a sufficiently strong 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 - VDD Pin 2 - Output Pin 3 - GND V DD O utput Voltage Regulator Chopper GND UA Package Pin 1 - VDD 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 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. US3881 CMOS Low Voltage Hall Effect Latch 3901003881 Rev 4.2 7/23/01 Page 1 US3881 CMOS Low Voltage Hall Effect Latch US3881 Electrical Specifications DC Operating Parameters: TA = 25, 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