Fixed 3V rail from a single cell
The internal switch is rated for 1.3A, which sets the practical output current ceiling — at 3V out with a 1.2V input, you can expect around 300-400 mA continuous before the switch current limit kicks in, depending on inductor and diode losses.
Switching frequency and inductor choice
Switching at 500 kHz, this part uses a standard boost topology without synchronous rectification, so the external Schottky diode and inductor are the main loss elements.
The small footprint suits space-constrained boards.