| Number of series cells | 1 |
| Charge current (Max) (A) | 3.5 |
| Operating Vin (Max) (V) | 18 |
| Cell chemistry | Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 |
| Battery charge voltage (Min) (V) | 3.5 |
| Battery charge voltage (Max) (V) | 4.8 |
| Absolute Vin (safety rating) (Max) ((V)) | 26 |
| Control interface | I2C |
| Features | BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Integrated ADC, Integrated LDO, Power Path, USB C/PD compatible, USB OTG integrated, VINDPM (Input voltage threshold to maximize adaptor power) |
| Operating Vin (Min) (V) | 3.9 |
| Rating | Catalog |
- High-efficiency, 1.5-MHz, synchronous switching mode buck charger for single cell battery
- >90% efficiency down to 25-mA output current from 5-V input
- Charge termination from 10 mA to 620 mA, 10-mA steps
- Flexible JEITA profile for safe charging over temperature
- BATFET control to support shutdown, ship mode and full system reset
- 1.5-μA quiescent current in battery only mode
- 0.15-μA battery leakage current in ship mode
- 0.1-μA battery leakage current in shutdown
- Supports USB On-The-Go (OTG)
- Boost mode operation supporting 3.84-V to 9.6-V output
- >90% boost efficiency down to 100-mA OTG current for 5-V VBUS
- Supports a wide range of input sources
- 3.9-V to 18-V wide input operating voltage range with 26-V absolute maximum input voltage
- Maximizes source power with input voltage regulation (VINDPM) and input current regulation (IINDPM)
- VINDPM threshold automatically tracks battery voltage
- Efficient battery operation with 15-mΩ BATFET
- Narrow VDC (NVDC) power path management
- System instant-on with depleted or no battery
- Battery supplement when adapter is fully loaded
- Flexible autonomous or I2C-controlled modes
- Integrated 12-bit ADC for voltage, current, temperature monitoring
- High accuracy
- ±0. 5% charge voltage regulation
- ±5% charge current regulation
- ±5% input current regulation
- Safety
- Thermal regulation and thermal shutdown
- Input, system, battery overvoltage protection
- Battery, converter overcurrent protection
- Charging safety timer
The BQ25620 and BQ25622 are highly-integrated 3.5-A switch-mode battery charge management and system power path management devices for single cell Li-Ion and Li-polymer batteries. The solution is highly integrated with built-in current sensing, loop compensation, input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4) between system and battery. The devices use narrow VDC power path management, regulating the system slightly above the battery voltage without dropping below a configurable minimum system voltage. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time, extends battery life during discharging phase, and the ultra-low 0.15-μA ship mode current extends battery shelf life. The I2C serial interface with charging and system settings makes the BQ25620 and BQ25622 truly flexible solutions.
