BQ24050

The BQ24050 is a highly integrated, low-voltage battery charger IC designed by Texas Instruments for single-cell lithium-ion and lithium-polymer batteries. It supports input voltages from 3.6V to 5.5V, making it suitable for USB-powered applications such as portable electronics, wearables, and small IoT devices. The device features an internal power MOSFET that enables efficient charging with minimal external components, reducing board space and cost. This charger operates in two primary modes: constant-current (CC) and constant-voltage (CV), ensuring safe and optimized battery charging. It includes programmable charge current up to 1A, adjustable via an external resistor, allowing flexibility for various battery capacities and system requirements. The IC also incorporates temperature monitoring through an external thermistor, enabling thermal regulation to prevent overheating during charging. Built-in protection features include overvoltage protection (OVP), overtemperature shutdown, and short-circuit protection, enhancing reliability and safety in demanding environments. Additionally, the BQ24050 supports automatic recharge functionality after a battery voltage drops below a threshold, maintaining battery health and performance over multiple cycles. Designed for low-power operation, the BQ24050 offers a shutdown mode with less than 1μA quiescent current, ideal for battery-powered systems requiring long standby times. It also includes a status pin that indicates charging state—such as charging active, done, or fault conditions—allowing system-level control without additional microcontroller intervention. The BQ24050 is commonly used in portable medical devices, wireless sensors, Bluetooth headphones, smartwatches, and other compact consumer electronics where efficient, reliable, and compact charging solutions are critical. Its simple interface, minimal external component count, and robust protection mechanisms make it a preferred choice for designers seeking high integration and ease of implementation.