2-cell Li-ion linear charger at 1.2 A
The BQ24004PWPG4 is a linear charger IC from Texas Instruments designed for 2-cell series Li-ion battery packs, terminating at 8.4 V. It delivers a constant charge current up to 1.2 A max, making it suitable for portable equipment and backup battery applications where a simple, low-noise charging solution is needed.
Temperature range and package constraints
Operating temperature spans -40°C to 70°C — the 70°C ceiling limits use to indoor or ventilated enclosures; derating above 50°C ambient will reduce the charge current. The 20-HTSSOP package with an exposed thermal pad requires a solid copper pour on the PCB for heat sinking; without it the thermal shutdown may trip before reaching the rated current.
Active production — no end-of-life concern
Sourced through our distribution channel against your BOM quantity — current pricing and lead time confirmed at quote time.
Programmable current and timer
Programmable features include charge current and charge timer, allowing the designer to set the fast-charge rate and safety timeout with external resistors. The constant-current charging profile is a linear regulator topology — no switching noise, but thermal dissipation at 1.2 A with an 8.4 V pack and 10 V supply can exceed 2 W, so the thermal pad layout is critical.