BQ24155RGYR

The bq24155RGYR is Texas Instruments’ battery charge-management IC for single‑cell Li‑ion/Li‑polymer packs with an integrated power-path. It lets you charge the battery from a 5V source (USB or adaptor) while simultaneously powering the system.
Key points:
- Integrated switching charger and power-path for seamless operation during charging.
- Programmable constant-current/constant-voltage charging with preconditioning for deeply discharged cells.
- Battery-temperature monitoring, automatic recharge, and robust safety features (overcurrent/short‑circuit, over/under-voltage, overtemperature).
- Status/monitoring pins for charge state and fault indication.
- Compact solution offered in TI’s RGYR 8‑pin package (small footprint).
Typical use: mobile devices and wearables where space and power efficiency matter. In short, it simplifies design by combining charging, system power, and protection in one chip.

Here are the main features of the BQ24155RGYR:
- Single-cell Li-Ion/Li-Po charger with integrated high-efficiency switching regulator and power-path management
- 5V USB input (typical 4.75–5.5V) for portable devices
- Programmable charging current (ISET) up to about 1.5 A
- Constant-current / constant-voltage charging with a 4.2V regulation for the cell
- Preconditioning for deeply discharged cells and automatic recharge
- Power-path architecture: supports system load while charging; protects the battery from brownouts
- Safety and reliability: overvoltage, short‑circuit/OC, and thermal protection; battery temperature monitoring (NTC input) and regulation
- Battery presence/detection and status reporting
- Small package with minimal external components (no external MOSFETs required in many designs)
Note: exact current limits and pin details are in the TI datasheet; values above are typical design references.

- Pin count/package: 16 pins (QFN, RGYR) with an exposed pad.
- Function: Single-cell Li‑ion/Li‑polymer battery charger with integrated power-path and system-load sharing. Accepts USB 5V input, provides regulated CC/CV charging with programmable current, and can power the system while charging. Includes status outputs (e.g., CHG/STAT) and thermal regulation features.

Manufacturer: Texas Instruments (TI).
What kind of company: TI is an American multinational semiconductor company that designs and manufactures analog and mixed-signal integrated circuits, embedded processors, and related semiconductor devices. It’s one of the world’s leading producers of analog ICs and power-management solutions.

BQ24155RGYR is a single‑cell Li‑ion/Li‑polymer charger with integrated power-path and safety features for USB/adaptor input. Typical applications:
- Smartphones, tablets, wearables
- Portable medical/fitness devices
- USB-powered IoT sensors and development boards
- Small drones and RC toys
- USB accessories and power banks requiring single‑cell charging

BQ24155RGYR uses a 16‑pin QFN package (3.0 x 3.0 mm) with an exposed pad (VQFN/EP); RoHS‑compliant.