| Number of series cells | 2 |
| Charge current (Max) (A) | 3 |
| Operating Vin (Max) (V) | 17 |
| Cell chemistry | Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 |
| Battery charge voltage (Min) (V) | 3.4 |
| Battery charge voltage (Max) (V) | 9 |
| Absolute Vin (safety rating) (Max) ((V)) | 28 |
| Control interface | Standalone (RC-Settable) |
| Features | BAT temp thermistor monitoring (hot/cold profile), IINDPM (Input current limit), Input OVP |
| Operating Vin (Min) (V) | 4 |
| Rating | Catalog |
- Standalone charger and easy to configure
- High-efficiency, 1.2-MHz, synchronous switch-mode buck charger
- 92.5% charge efficiency at 2A from 5-V input for 1-cell battery
- 91.8% charge efficiency at 2A from 9-V input for 1-cell battery
- 95% charge efficiency at 2A from 12-V input for 2-cell battery
- Single input to support USB input and high voltage adaptors
- Support 4.1-V - 17-V input voltage range with 28-V absolute maximum input voltage rating
- Input Voltage Dynamic Power Management (VINDPM) tracking battery voltage
- High integration
- Integrated reverse blocking and synchronous switching MOSFET
- Internal input and charge current sense
- Internal loop compensation
- Integrated bootstrap diode
- 3.4-V to 9.0-V programmable charge voltage
- 3.0-A maximum fast charge current
- 200-nA low battery leakage current at 4.5-V VBAT
- 4.25-μA VBUS supply current in IC disable mode
- Charge current thermal regulation at 120°C
- Precharge current: 10% of fast charge current
- Termination current: 10% of fast charge current
- Charge accuracy
- ±0.5% charge voltage regulation
- ±10% charge current regulation
- Safety
- Thermal regulation and thermal shutdown
- Input Under-Voltage Lockout (UVLO) and Over-Voltage Protection (OVP)
- Battery overcharge protection
- Safety timer for precharge and fast charge
- Charge disabled if battery feedback pin FB is open or short
- Cold/hot battery temperature protection
- Fault report on STAT pin
- Available in WQFN 3x3-16 package
The BQ25306 is a highly-integrated standalone switch-mode battery charger for 1-cell and 2-cell Li-ion, Li-polymer, and LiFePO4 batteries. The BQ25306 supports 4.1-V to 17-V input voltage and 3-A fast charge current.The integrated current sensing topology of the device enables high charge efficiency and low BOM cost. The best-in-class 200-nA low quiescent current of the device conserves battery energy and maximizes the shelf time for portable devices. The BQ25306 is available in a 3x3 WQFN package for easy 2-layer layout and space limited applications.
The BQ25306supports a 4.1-V to 17-V input to charge either single cell batteries or dual batteries in series with charge voltage from 3.4 V to 9.0 V programmable by resistor divider. The BQ25306provides up to 3-A continuous charge current to a single cell (1S) battery or dual cell batteries in series (2S). The device features fast charging for portable devices. Its input voltage regulation delivers maximum charging power to the battery from input source. The solution is highly integrated with an input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), and low-side switching FET (LSFET, Q3).
The BQ25306 features lossless integrated current sensing to reduce power loss and BOM cost with minimized component count. It also integrates a bootstrap diode for the high-side gate drive and battery temperature monitor to simplify system design. The device initiates and completes a charging cycle without host control. The BQ25306 charge voltage and charge current are set by external resistors. The BQ25306charge voltage is programmed by an external resister divider and it charges the battery in three phases: pre-conditioning, constant current, and constant voltage. At the end of the charging cycle, the charger automatically terminates if the charge current is below the termination current threshold and the battery voltage is above the recharge threshold. When the battery voltage falls below the recharge threshold, the charger will automatically start another charging cycle. The charger provides various safety features for battery charging and system operations, including battery temperature monitoring based on negative temperature coefficient (NTC) thermistor, charge safety timer, input over-voltage and over-current protections, as well as battery over-voltage protection. Pin open and short protection is also built in to protect against the battery voltage feedback pin FB or feedback resistors accidently open or short. The thermal regulation regulates charge current to limit die temperature during high power operation or high ambient temperature conditions.
The STAT pin output reports charging status and fault conditions. When the input voltage is removed, the device automatically enters HiZ mode with very low leakage current from battery to the charger device. The BQ25306 is available in a 3 mm x 3 mm thin WQFN package.
