Texas Instruments bq25770G Battery Charge Controller
Texas Instruments bq25770G Battery Charge Controller is a synchronous NVDC buck-boost battery charge controller that charges 2- to 5-cell batteries. These can be charged from a wide range of input sources, including USB adapters, extended power range (EPR) USB-C™ Power Delivery (PD) sources, standard power range (SPR) USB-C Power Delivery (PD) sources, and traditional adapters. The device offers a low component count, high-efficiency solution for space-constrained, 2- to 5-cell battery charging applications.
The NVDC configuration allows the system to be regulated based on battery voltage but not drop below the system minimum voltage. The system keeps operating even when the battery is completely removed or discharged. When load power exceeds the input source rating, the battery prevents the system from crashing by going into supplement mode. The bq25770G monitors adapter current, battery current, and system power. The flexibly programmable PROCHOT output goes directly to the CPU for throttling back when needed.
The TI-patented switching frequency dithering pattern can significantly reduce EMI noise over the entire conductive EMI frequency range (150kHz to 30MHz). Multiple dithering scale options are available, and the devices provide flexibility for different applications. The dithering feature greatly simplifies EMI noise filter design.
The charger operates in the TI-patented Pass-Through Mode (PTM) to improve efficiency over the full load range. In the PTM mode, the input power passes directly through the charger to the system. Switching losses of the inductor core and MOSFETs can be saved, thus achieving high-efficiency operation. The bq25770G is available in a 36-pin 4mm × 5mm WQFN package.
Features
- TI patented quasi dual phase buck-boost narrow voltage DC (NVDC) charger for USB-C Extended Power Range (EPR) interface platform
- 3.5V to 40V input range to charge 2- to 5-cell battery
- Charge current up to 16.3A/30A based on 5mΩ/2mΩ sensing resistor
- Input current limit up to 8.2A/16.4A based on 10mΩ/5mΩ sensing resistor
- Support USB 2.0, USB 3.0, USB 3.1, USB-C power delivery, and extended power range input current setting
- Input Current Optimizer (ICO) to extract max input power without overloading the adapter
- Integrated Fast Role Swap (FRS) feature following USB-PD specification
- Seamless transition between quasi-dual phase buck, buck-boost, and boost operations
- Input current and voltage regulation (IINDPM and VINDPM) against source overload
- Battery supplements system when the adapter is fully loaded
- IMVP8/IMVP9 compliant system features for the Intel platform
- Enhanced Vmin Active Protection (VAP) mode supplements battery from input capacitors during system peak power spike following the current Intel specification
- Comprehensive PROCHOT profile
- Two-level discharge current limit PROCHOT profile to avoid battery wearout
- System power monitor (PSYS)
- TI patented dual random spread spectrum (DRSS) for meeting IEC-CISPR 32 EMI specification
- TI patented Pass-Through Mode (PTM) for >99% efficiency and battery-fast charging support
- Input and battery current monitor through dedicated pins
- Integrated 16-bit ADC to monitor voltage, current, and power
- Battery MOSFET ideal diode operation in supplement mode
- Power up the USB port from the battery (USB OTG)
- 3V to 5V OTG
- Output current limit up to 3A based on 10mΩ sensing resistor
- 600kHz/800kHz programmable switching frequency
- SMBus host control interface for flexible system configuration
- High accuracy for the regulation and monitor
- ±0.5% Charge voltage regulation
- ±2% Charge current regulation
- ±2% Input current regulation
- ±2% Input/charge current monitor
- Safety
- Thermal regulation and thermal shutdown
- Input, system, battery overvoltage protection
- Input, MOSFET, inductor overcurrent protection
- 36-pin 4.0mm × 5.0mm WQFN package
Applications
- Standard notebook PC, Chromebook
- Appliances
- Battery charger
- Oxygen concentrator
Simplified Application Diagram
Related Development Tool
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