The bq24155 is a high-efficiency single-cell lithium-ion battery charger that is suitable for a wide range of portable applications. The charger can be programmed through an I2C interface to set battery charging parameters. The bq24155 integrates a synchronous PWM controller, power FETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.
The bq24155 is a fully integrated switch‑mode charger for single‑cell Li‑ion and Li‑polymer batteries. It offers high‑accuracy voltage and current regulation, USB‑friendly operation, and programmable charge parameters via an I²C‑compatible interface.
The document includes detailed electrical characteristics, typical application circuits, package information, and recommended operating conditions, enabling designers to implement efficient charging solutions in portable devices.
| Supply voltage range | 0.3‑20 V |
|---|---|
| Maximum charge current | 1.25 A |
| Input current regulation accuracy | +5 % |
| Operating temperature range | -40 °C to 85 °C |
| Package type | 14‑pin QFN |
| Charge voltage range | 3.5 V to 4.44 V |
The device is rated for a 20‑V absolute maximum input voltage.
Input current is automatically limited to the value set by the host.
It is supplied in a 14‑pin QFN (WCSP) package.