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 BQ25751
- Wide input voltage operating range: 4.4V to 70V
- Wide
battery voltage operating range: up-to 70V
- 6V up-to 48V lead-acid charging profile with bulk, absorb and float voltage charging phases
- Charge voltage temperature compensation
- Synchronous buck charge controller with NFET drivers
- Adjustable switching frequency from 200kHz to 600kHz
- Optional synchronization to external clock
- Integrated loop compensation with soft start
- Optional gate driver supply input for optimized efficiency
- Bidirectional converter operation (Reverse Mode) supporting USB-PD Extended Power Range
(EPR)
- Adjustable input voltage (VAC) regulation from 3.3V to 65V with 20mV/step
- Adjustable input current regulation (RAC_SNS) from 400mA to 20A with 50mA/step using 2mΩ resistor
- Direct power path management for highest efficiency to power system
- System power selection from adapter or battery
- Dynamic power management
- All N-channel FET drivers
- High accuracy
- ±0.5% charge voltage regulation
- ±3% charge current regulation
- ±3% input current regulation
- I2C 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
- Low battery quiescent current
- High safety integration
- Adjustable input overvoltage and undervoltage protection
- Battery Overvoltage and overcurrent protection
- Charging safety timer in CV Mode
- Thermal shutdown
- Status outputs
- Adapter present status (PG)
- Charger Operation status
- Package
- 36-pin 6mm × 5mm QFN
Description for the BQ25751
The BQ25751 is a wide input voltage, switched-mode buck-boost battery charge controller with direct power path control. The device offers high-efficiency battery charging over a wide voltage range with bulk, float and absorption charging for lead-acid batteries. The device integrates all the loop compensation for the buck-boost converter, thereby providing a high density solution with ease of use.
Besides the I2C 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.