100V Hall-effect current sensor with ambient field rejection and configurable overcurrent detection

The TMCS1170 is a galvanically

isolated Hall-effect current sensor with 100V functional isolation in a

small QFN package. An output voltage proportional to the input current is

provided with excellent linearity and low drift at all sensitivity options.

Signal conditioning circuitry with built-in drift compensation is capable of

less than 2.85% maximum sensitivity error over temperature with less than 3%

lifetime shift with no system level calibration.

AC or DC input current flows through an internal

conductor generating a magnetic field measured by integrated on-chip

Hall-effect sensors. Core-less construction eliminates the need for magnetic

concentrators. Differential Hall sensors reject interference from stray

external magnetic fields. Low conductor resistance increases measurable

current ranges up to ±60A while minimizing power loss and easing thermal

dissipation requirements. Integrated shielding enables excellent

common-mode rejection and transient immunity.

Fixed sensitivity allows the device to operate

from a single 3V to 5.5V power supply, eliminating ratiometry errors and

improving supply noise rejection. The small solution size, current

capability, and ambient field rejection make the device an ideal solution

for monitoring currents in tight spaces.