TPS61094 Supercapacitor Charging Board

The TPS61094 features a wide input voltage range and an output
voltage . When the TPS61094 is charging a supercapacitor in buck mode
, the charging current and termination voltage can be programmed using two external resistors
. When the TPS61094 operates in boost mode, the output voltage can be programmed using
one external resistor.
In automatic buck or boost mode (EN = 1, MODE = 1), upon
applying an input power supply, the device bypasses the input voltage to the output while simultaneously
charging the backup supercapacitor. When the input power supply is disconnected or falls below
the target output voltage, the TPS61094 enters boost mode and
regulates the output voltage via the backup supercapacitor. The TPS61094
consumes 60nA of quiescent current in this mode.
The TPS61094 supports true shutdown mode (EN = 0, MODE = 1) and
forced bypass mode (EN = 0, MODE = 0). In true shutdown mode
, the TPS61094 completely disconnects the load from the input power supply. When
forced , the TPS61094
connects the load directly to the input voltage via a bypass switch and consumes only 4nA of current, thereby extending battery
life .