TPS2661

• ±50-V operating voltage, ±55-V absolute maximum
• Integrated fixed bipolar 32-mA current limit
• Allows 2x current limit at startup
• 50% space savings compared to a typical discrete protection circuit
• Low R-on: 7.5-Ω typical
• Low Iq (< 100 nA) - current drawn from loop when powered from external supply
• Protection against miswiring conditions on IN and OUT
• Protection during signal line surge IEC61000-4-5 (with external TVS)
• Criteria-A EFT (IEC61000-4-4) immunity (with external TVS)
• Supports loop testing without supply (TPS26610 only)
• HART compliant
• Enable control
• SGOOD for system health monitoring
• Thermal shutdown

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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 R_ON 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 ± 2.25 V to ±20 V. It can also be powered from unipolar supplies as low as 3 V to 30 V. TPS26610 device features loop power mode to facilitate loop testing in un-powered state without ±Vs supplies.

The device also protects the system from output side miswiring in Analog Outputs and sensor transmitters by turning off the current path. 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.