What the 500 mA charge current ceiling means for your BOM
The BQ24230RGTRG4 is a single-cell Li-Ion linear charger from Texas Instruments, capped at 500 mA maximum charge current. That 500 mA ceiling is the first decision point: it fits small-form-factor devices with batteries in the 300–800 mAh range—think Bluetooth headsets, wearable trackers, or portable medical sensors. If your BOM calls for charging a 2000 mAh cell in under three hours, this part is not the one; you need a switch-mode charger with higher current. The constant-current phase is programmable via an external resistor, so you can dial it down to match a smaller cell without overstressing it.
Protection set: what is covered and what is not
The charger integrates over-temperature, over-voltage, reverse-current, and short-circuit fault protection. That covers the common failure modes in a single-cell Li-Ion system: a shorted battery terminal, a reversed input supply, or a charger that runs hot in a sealed enclosure. What it does not include is a dedicated battery NTC thermistor input for JEITA-compliant temperature monitoring—if your design requires that, you need an external thermistor circuit or a different charger IC.
Package and thermal reality
The 16-VFQFN with exposed pad (3x3 mm body) is the package. The 0.50 mm pitch demands a 4-layer board for reliable fan-out; two-layer designs risk lifting the corner pads during reflow.