Boost converter for single-cell supplies
The TPS610995YFFT is a fixed-output step-up (boost) converter from Texas Instruments, designed to generate a regulated 3.6V rail from input voltages as low as 0.7V and up to 5.5V. Its 800mA switch current rating determines the maximum output current at a given input voltage — expect roughly 200-250 mA at 3.6V out from a 1.5V cell, less from a near-depleted battery.
6-DSBGA footprint and thermal reality
Housed in a 6-bump DSBGA measuring roughly 1.2 x 0.8 mm, this package demands a clean PCB layout with short, wide traces to the inductor and output capacitor — the scorch mark on a dead board often traces to a lifted bump from thermal cycling.