This application note showcases the BQ2518x family of linear chargers in a compact small form factor battery charger application design. The BQ25180 and BQ25181 are I²C controlled, 1-cell 1-A linear battery chargers with power-path which focuses on small solution size and low quiescent current. The BQ2518x devices are well suited for wearables, medical, gaming accessories, trackers, and building automation applications. Available on a Wafer-level Chip-Scale (WCSP) and Quad-flat No-Leads (QFN) packages. The total solution size area of the BQ25180 (8-pin WCSP) design is 7 mm² and for the BQ25181 (10-pin QFN) the total solution size area is 12 mm². The solution size encompasses all the key components needed for operation.

Incorporated for functional evaluation on the board there is access to all pins of the BQ2518x via test points and it also includes the USB2ANY connector, used for communicating with the device via the TI Chargers GUI software. The total size of the 2-layer circuit board is 38 mm ✕ 38 mm for both BQ25180 and BQ25181 designs.