SLVAET3 October 2021 TPS8802
New smoke alarm regulations often require a 10-year battery life if the battery is the only power source. Battery selection in these alarms is highly dependent on the system power consumption, and lower power alarms have smaller, lower cost batteries. Achieving low power consumption requires low standby currents and careful management of the smoke alarm regulators, drivers, and amplifiers. The TPS8802 smoke alarm analog front end (AFE) integrates configurable regulators, drivers, and amplifiers with low active and standby currents for achieving 10-year battery life with a single lithium primary battery. The TPS8802 supports multi-wavelength photoelectric smoke sensors, carbon monoxide (CO) sensors, and a variety of battery configurations, all of which are explored in the context of power consumption.