BQ25798 Description
The BQ25798 is a fully integrated switch-mode buck-boost charger for 1-4 cell Li-ion batteries and Li-polymer batteries. The integration includes 4 switching MOSFETs, input and charging current sensing circuits, the battery FET and all the loop pensation of the buck-boost converter. It uses NVDC power path management, regulating the system not dropping below a configurable minimum system voltage.
BQ25798 Key Features
- High power density, high integration buck-boost charger for 1-4 cell batteries supporting USB PD 3.0 profile
- Integrates four switching MOSFETs, BATFET
- Integrates input and charging current sensing
- Highly efficient
- 750-kHz or 1.5-MHz switching frequencies
- 5-A charging current with 10-mA resolution
- 96.5% efficient: 16-V battery at 3A from 20V
- Supports a wide range of input sources
- Autonomously sampled open circuit voltage (VOC) maximum power point tracking (MPPT) for charging from a photovoltaic pan
- 3.6-V to 24-V wide input operating voltage range with 30-V