BQ24171RGYR – TEXAS INSTRUMENTS

The BQ24171RGYR is a Texas Instruments single-cell Li-ion battery charger IC optimized for low-power applications. It features a highly integrated architecture incorporating a switching charger, a linear pre-charger, and system-level protection circuitry all within a compact 10-pin WSON package. Operating from an input voltage range of 2.7V to 5.5V, it delivers a regulated 4.2V charge voltage to a single-cell lithium-ion battery. The device boasts a programmable charge current up to 500mA, adjustable via an external resistor, enabling designers to tailor charging speed to specific battery chemistries and application requirements. Its integrated thermal shutdown and input undervoltage lockout mechanisms enhance system robustness. The BQ24171RGYR excels in space-constrained designs requiring efficient and safe charging of small Li-ion batteries. Common applications include wearable electronics, portable medical devices, and low-power IoT sensors where its small size and low quiescent current (typically <1µA) are crucial. Its precise charge termination algorithm ensures optimal battery health and extends battery lifespan, making it a superior choice compared to simpler charging solutions. The device's integrated protection features minimize the need for external components, simplifying the bill of materials and reducing design complexity.