Data sheet, bq24298 I2C Controlled 3A Single Cell USB Charger With Narrow VDC Power Path Management and Adjustable Voltage USB OTG datasheet (Rev. A) · PDF|HTML ...
Buck-boost NVDC charger for 1-, 2-, 3-, or 4-cell Li-ion batteries · Input voltage range 3.2V to 23.4V (no dead zone) · System output voltage 3V to 18.304V ...
Hence, NVDC operates only as a buck converter, both when NVDC charges the battery and when the battery supplements the adapter and provides power to the system.