Power

Voltage supervisors help extend battery life

28th August 2019
Mick Elliott

The TPS3840 family of nanopower high-input voltage supervisors from Texas Instruments (TI) are reset ICs that can operate at up to 10V while maintaining very low quiescent current across all operating conditions. They are available at distributor Mouser Electronics.

The devices provide a combination of minimal power consumption, high accuracy, and low propagation delay to help extend battery life for a variety of low power, industrial and battery-powered applications.

The voltage supervisors deliver a broad input voltage of 1.5V to 10V, which enables the monitoring of 9V rails or batteries with no external components as well as 24V rails with external resistors.

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 less than a 1µA current consumption, the ICs 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.

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 (VPOR) 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 1% typical monitor threshold accuracy, built-in glitch immunity protection for manual reset and VDD, built-in hysteresis, and low open-drain output leakage current.

The voltage supervisors 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).

Target power management 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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