BQ25619ERTWR

The BQ25619ERTWR from Texas Instruments is a highly integrated, I2C controlled 1-cell battery charger designed for applications requiring efficient power management. This device features a synchronous switch-mode buck charger operating at 1.5MHz, offering high charge efficiency up to 95.5% at 0.5A and 94.5% at 1A. It supports a maximum charge current of 1.8A and provides precise voltage regulation with ±0.5% accuracy.

The charger is configurable via I2C, allowing for programmable JEITA profiles, charge voltage, current, and temperature thresholds. It supports a wide input voltage range from 4V to 13.5V, with an absolute maximum rating of 22V, and includes programmable input current limit (IINDPM) and maximum power tracking (VINDPM). The device also features narrow voltage DC (NVDC) power path management for instant system-on functionality, even with no battery or a deeply discharged battery.

Designed for space-constrained applications, the BQ25619ERTWR comes in a compact 24-WQFN (4x4mm) package. Its low quiescent current in Ship Mode (7µA) and system standby (9.5µA) helps conserve battery energy. Key features include ±6% charge current regulation, ±7.5% input current regulation, and low RDSON BATFET for minimized charging loss.

Applications for the BQ25619ERTWR include true wireless earbuds charging cases, consumer wearables like smartwatches, personal care devices, headphones, and hearing aid charging cases. Its high integration simplifies design by including all necessary MOSFETs, current sensing, and loop compensation.