4.5A single-cell charger with I²C programmability
The I²C interface lets firmware set the charge current, termination threshold, and timer limits — a step up from fixed-function chargers that require resistor dividers for each parameter. It integrates over-current, over-temperature, and over-voltage protection on-die, so the external BOM stays lean: no separate protection supervisor needed for most designs.
17V input — USB PD and adapter tolerant
The 17V maximum supply voltage covers USB-C Power Delivery profiles up to 15V, plus common wall adapters. The input OVP threshold is set internally, so a 15V adapter or a hot-plug transient won't blow the charger.
I²C-controlled charge profile
Charge current is constant-current programmable via I²C, not a fixed resistor. That means the same PCB can support different cell capacities by changing a firmware register.
24-VQFN (4x4) with exposed pad — thermal management
The 24-VQFN package measures 4x4 mm with an exposed thermal pad. The datasheet's recommended layout uses a 2x2 via array under the pad — skip that and the charger will current-fold long before hitting 4.5A in a warm enclosure.
The base product number BQ24190 covers multiple package and tape variants; the RGER suffix is the 24-VQFN on Tape & Reel.