The TPS2661x is a compact, feature rich, fully integrated current loop protector suitable for analog inputs, analog outputs, sensor transmitters, HART Inputs and UART IO protection. It provides Universal Input protection for ±20 mA, 0 to 20 mA, 4-20 mA. Low RON of 7.5 Ω minimizes drop in the current loop, thereby extending operating range and supporting operation even with lower voltage power supplies. The device can withstand and protect the loads from positive and negative supply voltages up to ±50 V. The MODE pin allows flexibility to enable 2x current limit through the device to enable proper startup of two wire transmitters. Device is capable of operating from an external bipolar supply as low as ± 2.5 V to ±20 V. It can also be powered from unipolar supplies as low as 3 V to 30 V. In case the external bias supply (+Vs) is down, the device intelligently switches from external supply to loop supply in TPS26610 variant, thereby not breaking the loop in redundant systems.
The device also protects the system from output side miswiring in Analog Outputs and sensor transmitters by turning off the current path when potential on OUT pin exceeds the supply rails. The internal robust protection control blocks along with the 50-V rating of the TPS2661x helps to protect against surge (IEC61000-4-5) and EFT (IEC61000-4-4) transients for signal lines. The device greatly reduces system footprint by its 2.9 mm × 1.6 mm 8-pin SOT-23 package.