2-cell Li-Ion linear charger in a 20-PowerTSSOP
The Texas Instruments BQ24004PWP is a linear charger IC designed for charging two-series Lithium-Ion battery packs.
1.2 A charge current and 8.4 V termination — sizing the BOM
The 1.2 A maximum charge current sets the thermal budget for the linear pass element. The programmable timer allows the designer to set a maximum charge duration, preventing overcharge if the battery never reaches the 8.4 V termination. The current-programming pin sets the constant-current phase level, which should be matched to the battery's recommended charge rate (typically 0.5 C to 1 C for Li-Ion).
