BQ24170

The BQ24170 is a highly integrated, high-efficiency battery charger IC designed for single-cell lithium-ion and lithium-polymer batteries. It supports input voltage from 4.5 V to 28 V, making it suitable for a wide range of power sources including USB, AC adapters, and solar panels. The device features an integrated N-channel MOSFET power switch that enables efficient charging with minimal external components, reducing board space and cost. This charger offers configurable charge current up to 3 A and programmable charge voltage with ±0.5% accuracy, ensuring safe and precise battery management. It includes built-in thermal regulation to prevent overheating by reducing charge current when the die temperature exceeds a threshold, maintaining reliable operation under varying environmental conditions. Additionally, the BQ24170 supports both constant-current (CC) and constant-voltage (CV) charging modes, essential for optimal battery health and longevity. The BQ24170 integrates multiple protection features such as overvoltage, overcurrent, and short-circuit protection on both the input and output sides. It also provides battery temperature monitoring via a thermistor input, allowing dynamic adjustment of charge parameters based on temperature to enhance safety and performance. An I²C interface enables system-level control and status monitoring, offering flexibility in configuring charge profiles and accessing real-time diagnostics. Designed for compact, portable applications, this IC supports low quiescent current operation—down to 3 µA in shutdown mode—making it ideal for always-on devices. It operates in various modes including pre-charge, fast charge, and termination, with automatic transition between them based on battery state. The device also includes a smart discharge path feature, which allows the battery to supply power to the load when the input source is removed, ensuring uninterrupted system operation. Common applications include portable medical devices, handheld tools, consumer electronics, and industrial equipment where reliable, efficient, and safe battery charging is critical. Its robust design, minimal external component count, and comprehensive protection mechanisms make it a preferred solution for developers seeking high-performance power management in space-constrained environments.