BQ24120RHLT — single-cell Li-Ion charger with 2A programmable current
The Texas Instruments BQ24120RHLT is a bqSWITCHER™ series single-cell Li-Ion/Polymer battery charger IC in a 20-VQFN (3.5x4.5) package. It integrates a constant-current/constant-voltage charge algorithm with programmable charge current up to 2A and a fixed 4.2V battery regulation voltage. The input supply range extends to 16V, making it suitable for 5V USB or 12V wall-adapter inputs without an external pre-regulator in many portable designs.
Charge current, timer, and thermal protection
Charge current is programmable via an external resistor, and the timer-based termination provides a safety backup if the current taper does not reach the termination threshold within the configured window. Built-in over-temperature protection shuts down the charger if the die temperature exceeds the safe limit, protecting both the IC and the battery during high-ambient or high-current operation.
The exposed pad is the primary thermal path and should be connected to the ground plane with multiple vias.
Lifecycle and compliance
As a Texas Instruments bqSWITCHER™ series device, it is supported by full datasheet documentation and application notes. No pin-compatible second source is listed; the part is single-sourced from TI.