The TPS3840 series of nanopower high-input voltage supervisors from Texas Instruments is available from Mouser Electronics. The devices are reset ICs that can operate at up to 10V while maintaining very low quiescent current across all operating conditions. A combination of minimal power consumption, high accuracy and low propagation delay helps extend the battery life of a variety of low-power, industrial and battery-powered applications.
The devices deliver a broad input voltage of 1.5 to 10V, which enables the monitoring of 9V rails or batteries with no external components, and 24V rails with external resistors. Their nano-quiescent current (nano-Iq) of 350nA (typical) increases battery life for low-power applications and reduces current consumption when utilising those external resistors. With current consumption less than 1µA, they can be configured to work as either a comparator (with a simple three-pin configuration) or as a daisy-chained universal power supply supervisor that acts as a sequencer.
Their fast start-up delay allows the detection of a voltage fault before the rest of the system powers up, providing maximum safety in hazardous start-up fault conditions, and the low power-on-reset prevents false resets, premature enable or turn-on of next device, and proper transistor control during power-up and power-down. Additional features include a typical monitor threshold accuracy of 1 per cent, built-in glitch immunity protection for manual reset and direct drain voltage, built-in hysteresis and low open-drain output leakage current.
The devices are available in a five-pin, industry-standard SOT-23 package, with three output topology options: open-drain, active-low (TPS3840DL), push-pull, active-low (TPS3840PL), and push-pull, active-high (TPS3840PH). Suitable applications include grid infrastructure equipment, such as circuit breakers, smart meters and other monitoring and protection equipment, factory and building automation, electronic point of sale devices, and portable and battery-powered systems.
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