| Number of series cells | 1, 2, 3, 4, 5 |
| Charge current (Max) (A) | 16.2 |
| Operating Vin (Max) (V) | 26 |
| Cell chemistry | Lead Acid, Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4, NiCd, NiMH, SuperCap |
| Battery charge voltage (Min) (V) | 1.024 |
| Battery charge voltage (Max) (V) | 23 |
| Absolute Vin (safety rating) (Max) ((V)) | 32 |
| Control interface | I2C |
| Features | IC thermal regulation, ICO (Input Current Optimization), IINDPM (Input current limit), Input OVP, Integrated ADC, USB C/PD compatible, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) |
| Operating Vin (Min) (V) | 3.5 |
| Rating | Catalog |
- No battery MOSFET for saving cost and high efficiency
- 400-kHz/800-kHz programmable switching frequency for high efficiency/high power density
- Buck-boost charger for USB-C Power Delivery (PD) interface platform
- 3.5-V to 26-V input range to charge 1- to 5-cell battery
- Charge current up to 16.2 A/8.1 A with 128-mA/64-mA resolution based on 5-mΩ/10-mΩ sensing resistor
- Input current limit up to 10 A/6.35 A with 100-mA/50-mA resolution based on 5-mΩ/10-mΩ sensing resistor
- Support USB 2.0, USB 3.0, USB 3.1 and USB Power Delivery (PD)
- Input Current Optimizer (ICO) to extract max input power without overloading the adapter
- Seamless transition between buck, buck-boost, and boost operations
- Input current and voltage regulation (IINDPM and VINDPM) against source overload
- TI patented switching frequency dithering pattern for EMI noise reduction
- TI patented Pass Through Mode (PTM) for system power efficiency improvement and battery fast charging achieving 99% efficiency.
- Input and battery current monitor through dedicated pins
- Integrated 8-bit ADC to monitor voltage, current and power
- Support independent comparator logic with dedicated pins
- Power up USB port from battery (USB OTG)
- 3-V to 24-V OTG with 8-mV resolution
- Output current limit up to 12.7 A/6.35 A with 100-mA/50-mA resolution based on 5-mΩ/10-mΩ sensing resistor
- I2C host control interface for flexible system configuration
- High accuracy for the regulation and monitor
- ±0.5% Charge voltage regulation
- ±3% Charge current regulation
- ±2.5% Input current regulation
- ±2% Input/charge current monitor
- Safety
- Thermal shutdown
- Input, system, battery overvoltage protection
- Input, MOSFET, inductor overcurrent protection
- Package: 32-Pin 4.0 mm × 4.0 mm WQFN
The BQ25731 is a synchronous buck-boost battery charge controller to charge a 1- to 5-cell battery from a wide range of input sources including USB adapter, high voltage USB-C Power Delivery (PD) sources, and traditional adapters. It offers a low component count, high efficiency solution for space constrained, 1- to 5-cell battery charging applications.
During power up, the charger sets the converter to a buck, boost, or buck-boost configuration based on the input source and battery conditions. The charger seamlessly transits between the buck, boost, and buck-boost operation modes without host control.