Packaging information
| Package | Pins VQFN (RRV) | 36 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 3,000 | LARGE T&R |
Features for the BQ25756
- Wide input voltage operating range: 4.2 V to 70 V
- Wide battery
voltage operating range: up-to 70 V with multi-chemistry support:
- 1- to 14-cell Li-ion charge profile
- 1- to 16-cell LiFePO 4 charge profile
- Synchronous buck-boost charge controller with
NFET drivers
- Adjustable switching frequency from 200 kHz to 600 kHz
- Optional synchronization to external clock
- Integrated loop compensation with soft start
- Optional gate driver supply input for optimized efficiency
- Automatic maximum power point tracking (MPPT) for solar charging
- Buck-only mode
- Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range
(EPR)
- Adjustable input voltage (VAC) regulation from 3.3 V to 65 V with 20-mV/step
- Adjustable input current regulation (R AC_SNS) from 400 mA to 20 A with 50-mA/step using 5-mΩ resistor
- High accuracy
- ±0.5% charge voltage regulation
- ±3% charge current regulation
- ±3% input current regulation
- I 2C controlled for optimal system performance with resistor-programmable
option
- Hardware adjustable input and output current limits
- Integrated 16-bit ADC for voltage, current, and temperature monitoring
- High safety integration
- Adjustable input overvoltage and undervoltage protection
- Battery overvoltage and overcurrent protection
- Charging safety timer
- Battery short protection
- Thermal shutdown
- Status outputs
- Adapter present status ( PG)
- Charger operation status (STAT1, STAT2)
- Package
- 36-pin 5 mm × 6 mm QFN
Description for the BQ25756
The BQ25756 is a wide input voltage, switched-mode buck-boost Li-Ion, Li-polymer, or LiFePO 4 battery charge controller with bidirectional power flow support. The device offers high-efficiency battery charging over a wide voltage range with accurate charge current and charge voltage regulation, in addition to automatic charge preconditioning, termination, and charge status indication. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density solution with ease of use. In reverse mode, the device draws power from the battery and regulates the input terminal voltage with an added constant current loop for protection, supporting USB-PD EPR power profile.
Besides the I 2C host-controlled charging mode, the device also supports standalone charging mode via resistor programmable limits. Input current, charge current and charge voltage regulation targets can be set via the ILIM_HIZ, ICHG and FB pins, respectively.