This battery charger is designed for a 20-V_IN,
140-W notebook personal computer (PC), featuring the BQ25720 1-to-4 cell narrow voltage DC (NVDC) buck-boost battery charge controller. This battery charger delivers 140-W with 97.2% efficiency and fits in a compact 1-in × 1.3-in (25.4-mm × 33.0-mm) form factor. The high-density design utilizes TI dual field-effect transistor (FET) - CSD87352 and reduces the design size by 40% compared to a discrete FET design. Due to the low thermal resistance of TI dual FETs, the device temperature is kept low, even with a smaller design size. This reference design is an excellent choice for notebook PCs where high power, high efficiency, and high density are top priorities. The design supports a 1-to-4S battery and accepts a wide input range such as USB Type-C® Power Delivery (PD) sources and traditional adapters.