Texas InstrumentsTLV61048DBVR.
Non-synchronous boost converter, SOT-23-6. Vin 2.65–5.5 V, Vout up to 14 V, 3.7 A typ (2.9 A min) switch limit, 600 kHz/1 MHz (FREQ), Vref 0.80 V, internal compensation + 2 ms soft-start. Boosts VSYS to the 5 V rail (U3).