DESCRIPTION

The Allegro? ACS72981 family of current sensor ICs provides

economical and precise solutions for AC or DC current sensing.

A 250 kHz bandwidth makes it ideal for motor control, load

detection and management, power supply and DC-to-DC

converter control, and inverter control. The <2 μs response

time enables overcurrent fault detection in safety-critical

applications.

The device consists of a precision, low-offset linear Hall

circuit with a copper conduction path located near the die.

Applied current flowing through this copper conduction path

generates a magnetic field which the Hall IC converts into a

proportional voltage. Device accuracy is optimized through the

close proximity of the magnetic signal to the Hall transducer.

A precise, proportional output voltage is provided by the

low-offset, chopper-stabilized BiCMOS Hall IC, which is

programmed for accuracy at the factory. Proprietary digital

temperature compensation technology greatly improves the

zero output voltage and output sensitivity accuracy over

temperature and lifetime.

The output of the device increases when an increasing current

flows through the primary copper conduction path (from

terminal 5 to terminal 6), which is the path used for current

sampling. The internal resistance of this conductive path is

200 μΩ typical, providing low power loss and increasing power

density in the application.

The sensor employs differential sensing techniques that virtually

eliminate output disturbance due to common-mode interfering magnetic field.

FEATURES AND BENEFITS

? AEC-Q100 automotive qualification

? High-bandwidth 250 kHz analog output

? Less than 2 μs output response time

? 3.3 V and 5 V supply operation

? Ultralow power loss: 200 μΩ internal conductor

resistance

? Industry-leading noise performance and increased

bandwidth through proprietary amplifier and filter design

techniques

? Greatly improved total output error through digitally

programmed and compensated gain and offset over the

full operating temperature range

? Small package size, with easy mounting capability

? Monolithic Hall IC for high reliability

? Output voltage proportional to AC or DC currents

? Factory-trimmed for accuracy

? Extremely stable zero amp output offset voltage over

temperature and lifetime