Single-cell Li-Ion charger with USB interface
The Texas Instruments BQ24266RGER is a single-cell lithium-ion battery charger IC designed for portable applications requiring a USB power source. It integrates a constant-current programmable charge controller with a maximum charge current of 3A, making it suitable for charging single-cell Li-Ion packs from a 14V maximum input supply.
Texas Instruments has classified the BQ24266RGER as obsolete. No pin-compatible direct replacement from Texas Instruments is documented.
Key parametrics for BOM fit
The 3A maximum charge current is programmable via external resistor, allowing the designer to set the charge rate to match the battery capacity. The 14V maximum input supply covers standard USB (5V) and higher-voltage adapters up to 14V, with over-voltage and over-temperature fault protection built in. The single-cell configuration targets 4.2V battery pack voltage, typical for Li-Ion chemistries. The constant-current programmable charge profile supports standard CC/CV charging algorithms without external microcontroller intervention.