The Allegro ACS70312 IC incorporates a Hall element with BiCMOS integrated circuitry to provide a fully monolithic linear current sensor IC. The IC is sensitive to magnetic flux density orthogonal to the IC package surface and the output is an analog voltage proportional to the applied flux density. The ACS70312 is designed to be used in conjunction with a ferromagnetic core to provide highly accurate current sensing. The gain and offset drift over temperature is factory-programmed at Allegro and delivers a solution with ±1% sensitivity error and ±5 mV offset error from 25°C to 150°C.
The ACS70312 is customer programmable. The absolute value of gain and offset can be programmed after manufacturing to provide customers with industry-leading current sensing accuracy. The sensor has a high operating bandwidth from DC to 240 kHz and a fast 2 μs response time. The ACS70312 is ideal for use in high-frequency automotive inverters and DC/DC converters where fast switching is required.
The ACS70312 offers undervoltage detection (UVD) as well as low-voltage programming that eliminates the need for voltages greater than VCC during user programming. Broken-ground-wire detection, clamps, power-on-reset, and under/ overvoltage detection provide the required diagnostics for automotive applications.
The on-board supply regulator enables the VCC pin to survive voltages of ±18 V and the VOUT pin to survive voltages of +16 to –6 V for added robustness in the harsh automotive environment. Device parameters are specified across an extended ambient automotive temperature range: –40°C to 150°C. The ACS70312 sensor IC is provided in an extremely thin case (1 mm thick), 4-pin SIP (single in-line package, suffix KT). Packages are lead (Pb) free, with 100% matte tin leadframe plating.
