What this Li-Ion charger does on the board
The BQ24008PWP is a linear battery charger IC from Texas Instruments designed to charge a single-cell Lithium-Ion pack. Fault protection covers over-temperature shutdown, and the device operates from a supply up to 10V.
Package and footprint — what to expect at the bench
The BQ24008PWP comes in a 20-lead HTSSOP (PowerTSSOP) with a 4.40 mm body width and 0.65 mm pitch. The part is surface-mount only and ships in tubes.
Key ratings for the BOM decision
Maximum charge current is 1.2A — enough for a typical smartphone or tablet-sized cell, though the linear topology means the pass element dissipates (Vin - Vbat) × Icharge as heat. At 1.2A with a 5V input and a 3.7V battery, that's about 1.56 W, which the HTSSOP pad can handle with good board thermal design. The supply range goes up to 10V, so a 5V USB or 9V wall adapter is fine.