This design is meant to extract the energy stored in the supercapacitors with maximum efficiency to provide the required energy to generate the last gasp message and transmit this loss of power message to the system manager.

The TPS61381 supports maximum Iout depending on backup battery voltage (VBUB), by drawing the required energy from the supercapacitors through the boost convertor action. The transition from the main supply to the backup supply is meant to take place during power down situation without disruption of the load. The duration for backup power can be designed as needed by varying the capacitance value or by increasing the number of backup cells.

Here, the system is designed to sustain a maximum power draw of 28W for a period of 75ms. This application follows the below given design specifications; see Table 2-1.