Single-cell Li-Ion charger with I²C programmability
The Texas Instruments BQ24152YFFT is a single-cell Li-Ion/Polymer linear charger that uses an I²C interface to set charge current, termination timer, and battery regulation voltage. It delivers up to 1.25 A of programmable charge current to a single cell with a maximum battery pack voltage of 4.44 V.
1.25 A charge current and 4.44 V ceiling
The maximum charge current of 1.25 A suits single-cell Li-Ion packs in the 1000–2500 mAh range — enough for a portable medical device or a handheld scanner to charge in under two hours. The battery regulation voltage tops out at 4.44 V, which covers standard 4.2 V cells plus the higher-voltage 4.35 V and 4.4 V chemistries used in some high-density smartphone and tablet packs. Fault protection includes over-temperature and over-voltage shutdown, so the charger can sit on the board without a separate supervisor IC in most designs.
I²C control: current, timer, voltage all programmable
Unlike a fixed-function charger where the resistor divider sets the float voltage, the BQ24152YFFT lets firmware adjust charge parameters on the fly via I²C. That means the same BOM can handle different cell chemistries by changing a register write, and the host can terminate charging by timer or by current taper without extra pins.
NRND — plan for a last-time buy or alternate
The part is still available for existing production runs, but TI is not actively supporting new design-ins.
20-DSBGA — fine-pitch layout considerations
The 20-DSBGA package (0.4 mm pitch, 0.25 mm ball diameter) requires a controlled solder-paste stencil and a reflow profile matched to the board thickness.