1S Li-Ion/Polymer charger with USB input
The Texas Instruments BQ24030RHLR is a linear battery charger from the bqTINY™ III series, designed for single-cell (1S) Lithium Ion or Lithium Polymer packs.
Charge current and programmable features
The charge current is constant and programmable via an external resistor, with a ceiling of 1.5 A. Additional programmable features include a charge timer, which allows the designer to set a safety timeout for the charge cycle. Fault protection covers over-temperature, reverse current, and short-circuit conditions, providing a robust charging solution for portable devices without requiring external monitoring circuitry.
Package and thermal pad rework
Housed in a 20-VFQFN Exposed Pad package (Supplier Device Package 20-VQFN 3.5x4.5 mm), the part is surface-mount and requires a thermal pad on the PCB for heat sinking. Under a hot-air station, the small 3.5x4.5 mm body reflows cleanly if the pad is properly tinned and the profile stays within the datasheet's recommended reflow curve.
The 16 V maximum supply voltage gives headroom for unregulated USB or 12 V rail inputs.