1.2 A linear charge for single-cell Li-Ion
The BQ24003PWPG4 is a linear charger IC from Texas Instruments designed for single-cell Lithium-Ion battery packs. Charge current and charge timer are programmable via external resistors, so no I2C or GPIO overhead — set the rate with a single passives change. The constant-current/constant-voltage profile is handled internally.
Thermal and supply budget for the board
Maximum supply voltage is 10 V, which covers standard 5 V USB and 9 V wall-adapter rails with margin. The operating ambient range is -40°C to 70°C, suitable for outdoor telecom, industrial handhelds, and automotive cabin-adjacent equipment. At 1.2 A with a 5 V input and 4.2 V battery, expect ~1 W dissipation; a 2-layer board with a solid ground plane under the pad handles it. Built-in over-temperature fault protection shuts down the charger if the die exceeds the safe junction limit — a safeguard against a stalled fan or blocked vent in an enclosure.
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