Texas Instruments Incorporated
INTEGRATED CIRCUIT FOR SMOKE DETECTOR HAVING COMPATIBILITY WITH MULTIPLE POWER SUPPLIES

Abstract:

An AFE chip for a smoke detector includes a DC/DC boost converter having a boost input, a boost output, and a boost upper power supply input. The boost input is coupled to a first pin that is adapted for coupling to a battery through an inductor and the boost output is coupled to a second pin. The DC/DC boost converter is configured to not switch when a voltage on the second pin is greater than a programmed boost voltage. A set of power regulator circuits have a power input, which is coupled to a third pin, and a power output. The third pin is adapted for receiving an input voltage, the power output is coupled to provide an internal voltage, and the set of power regulator circuits are further coupled to the boost upper power supply input.