The BQ24120RHLTG4 is a single-cell Li-Ion or Li-Polymer charger from TI's bqSWITCHER series, delivering a programmable constant-current charge up to 2A and terminating at 4.2V pack voltage. The 16V maximum supply input lets it run from a 5V USB rail or a 12V adapter without an external pre-regulator — handy in portable instruments, handheld scanners, and battery-backed IoT gateways where the input source varies.
Programmable current and timer — no external FET needed
Charge current is set with a single resistor; the timer and current are the only programmable features, keeping the BOM lean. The IC integrates the power FET and sense resistor — no external MOSFET or current-sense amplifier required, which simplifies layout and saves board area in the 20-VQFN (3.5x4.5 mm) package.
Over-temperature protection and industrial temperature range
Built-in over-temperature fault protection shuts down the charger if the die exceeds safe limits — critical when the 2A charge current is run at high ambient temperatures.