Texas Instruments BQ25121YFPT, single-cell Li-Ion linear battery charger, 300 mA max charge current, I²C programmable, over-voltage protection, 25-bump DSBGA package, -40°C to 125°C operating range.
| Parameter | Value |
|---|---|
| Mounting | Surface Mount |
| Battery pack voltage | 4.2V |
| Supply voltage | 5.5V |
| Current - charging | Constant - Programmable |
| Charge current - max | 300mA |
| Interface | I²C |
| Operating temperature | -40°C~125°C(TJ) |
| Package | Tape & Reel (TR); Cut Tape (CT) |
| Case | 25-XFBGA, DSBGA |
| Number of cells | 1 |
| Fault protection | Over Voltage |
| Battery chemistry | Lithium Ion |
| Programmable features | Current |
The Texas Instruments BQ25121YFPT is a linear battery charger for single-cell Lithium-Ion packs, delivering a programmable charge current up to 300 mA. The charge current is set over I²C, so the charging profile can be tuned in firmware without a resistor swap. Over-voltage protection is built in.
That means TI will continue to supply it for existing production, but new BOMs should target a current-production alternate.
No official successor is listed on the record. For a current-production alternative within the same charger family, review the BQ2512x series — confirm pin-compatibility and feature set against the BQ25120.
Both are single-cell Li-Ion linear chargers in the same DSBGA package. The BQ25120 adds a buck converter and power-path management; the BQ25121YFPT is a charger-only part with I²C-programmable current. Pin-compatibility should be verified against the respective datasheets.