Texas Instruments' BQ25887 is a highly-integrated 2 A boost switch-mode battery charge management device for 2-cell (2s) Li-Ion and Li-polymer batteries. The BQ25887 has I2C control with cell balancing, no OTG, and no power-path.
Features
- High-efficiency 2 A, 1.5 MHz switch-mode boost charger:
- 93.4% charge efficiency at 5 V adapter, 7.6 V battery, and 1 A charge
- Optimized for USB input and 2s Li-Ion batteries
- Selectable low-power PFM mode for light-load operations
- Single input to support USB input adapters:
- Supports 3.9 V to 6.2 V input voltage range with 20 V absolute maximum input voltage rating
- Input current limit (500 mA to 3.3 A with 100 mA resolution) to support USB2.0 and USB3.0 standard adapters
- Max power tracking by input voltage limit up to 5.5 V
- Cell balancing and I2C control:
- Integrated FETs for balancing current up to 400 mA
- Automatic cell balancing with a default register setting
- Input current optimizer (ICO) to maximize input power without overloading the adapters
- Integrated 16-bit ADC for system monitoring (BUS voltage and current, each cell voltage, charge current, and NTC and die temperature)
- High integration includes all MOSFETs, current-sensing, and loop compensation
- High accuracy:
- Charge voltage regulation: ±0.5%
- Charge current regulation: ±5%
- Input current regulation: ±7.5%
- Safety:
- Battery temperature sensing in charge
- Thermal regulation and thermal shutdown
