POWERQUARK Unveils 80V High-Efficiency Synchronous Bidirectional Buck-Boost Charging Chip for Energy Storage Market
2025-06-20
POWERQUARK announced the launch of its new high-efficiency synchronous bidirectional buck-boost charging chip PQ8808, which supports a maximum charging voltage of up to 80V. This chip is primarily aimed at the rapidly growing energy storage market and is suitable for various types of energy storage batteries, including lithium-ion and lithium iron phosphate battery packs. In addition to energy storage applications, the PQ8808 can also be used in high-power scenarios such as power tools, electric bicycles, and docking stations, further expanding the application scope of POWERQUARK's charging chips.
Flexible Configuration, Enhanced Safety, and Activated High-Efficiency Charging and Discharging Experience
PQ8808 features a wide input voltage range of 4.5V to 80V. The product supports bidirectional operation mode. In discharge mode, it meets the full-range output standard of PD3.1 EPR. The internal register voltage adjustment can output a voltage range of 5V to 48V, and the voltage adjustment step meets the requirements of PPS and EPR AVS.
PQ8808 can help engineers develop charging and discharging systems more simply and efficiently. Engineers can easily set the charging/discharge mode through the I2C interface and flexibly adjust parameters such as charging current, charging voltage, input voltage regulation, input current limit, OTG output voltage regulation, current limit, and operating status. PQ8808 supports input current limiting and input voltage limiting functions, which can also be configured through the I2C interface to match the protection of different upstream power sources.
PQ8808 also supports standalone offline configuration of charging parameters. Charging and discharging voltages, input/output current limits, dead time, and adjustable switching frequencies ranging from 80kHz to 480kHz can be set through external resistors. For photovoltaic applications such as outdoor power sources, the chip integrates buck-boost control and MPPT (Maximum Power Point Tracking) algorithms, improving the efficiency of terminal product development and debugging.
For high-power requirements, PQ8808 supports a sampling resistor as low as 2mΩ and a maximum charging and discharging current of up to 50A. It can match different current sampling resistors for various power configurations. Within the temperature range of 0°C to 85°C, PQ8808 achieves a high charging current accuracy of ±3% and a charging voltage accuracy of ±0.5% at the battery terminal, preventing overcharging or over-discharging of the battery and enhancing the battery's lifespan and safety.
Addressing Development Challenges for Energy Storage Scenarios
Common issues in existing energy storage battery charging solutions on the market include:
The use of discrete components and MCU digital controllers, resulting in long system development cycles, complex peripheral circuits, and high costs.
The need for an additional MCU to implement the MPPT algorithm.
Strict requirements for MOSFET selection and driving, making it difficult to configure and optimize efficiency flexibly.
Poor system reliability, with complex and incomplete protection logic.
Buck-boost controller ICs only provide CC/CV loop control without a comprehensive battery charging management mechanism.
PQ8808 can help engineers build a smaller and lower-cost charging and discharging system. The highly integrated control logic and algorithms of the chip simplify the peripheral circuitry. Unlike discrete solutions that require numerous components such as MCUs, driver chips, voltage/current op-amps, and comparators, PQ8808 can achieve an efficient and complete charging and discharging system on its own.
PQ8808 solution has below advantages over discrete control solutions:
High Integration and Simple Control Implementation: PQ8808 integrates buck-boost control and MPPT algorithms. It also features an 11-bit high-precision ADC for voltage, current, and NTC thermistor detection to monitor battery pack temperature. The simple peripheral circuitry helps engineers reduce system development costs.
Built-in MPPT Algorithm with No Need for An Additional MCU Digital Controller: PQ8808 uses the perturbation and observation method to track the maximum power point of solar panels. It also employs digital averaging filters and algorithms to ensure the stability of the maximum power point. The chip provides a rich set of debugging interfaces, allowing engineers to adjust the full-scan period, perturbation period and step size, observation wait delay period, full-scan minimum range, and ADC digital filter length. Without additional hardware circuits and complex software algorithm development, engineers can efficiently and flexibly implement maximum power point tracking for photovoltaic cells by configuring the MPPT-related registers of the chip.
Flexible Drive Configuration: PQ8808 supports external 10V or internal VCC for drive power supply, and the dead time is hardware configurable. This allows optimization of power efficiency for different application scenarios. The chip is compatible with high power, supporting MOSFETs with large Qg (>100nC) and Ciss (>10nF), such as Toll MOS, PDFN 5*6, and TO-263 in various package types. A single chip can achieve up to 1200W of power with a peak efficiency of 98%.
High Reliability, Supports A Wide Operating Temperature Range of -40°C to 125°C: PQ8808 provides comprehensive protection functions, including input overvoltage, battery overvoltage, input overcurrent, peak current protection, and over-temperature protection. Compared to digital solutions, cycle-by-cycle current zero-crossing detection effectively prevents abnormal occurrences such as current backflow and voltage runaway.
Comprehensive Battery Charging Management Mechanism: PQ8808 supports various charging modes, including trickle charging, pre-charging, constant current charging, constant voltage charging, automatic termination, and float charging. It automatically completes the entire battery charging process, enhancing the battery's lifespan and safety.
PQ8808 supports frequency jitter to achieve better EMI performance and can synchronize with an external clock through the SYNC pin. This facilitates phase-shifting in parallel operation to reduce ripples.
As the requirements for density and conversion efficiency of energy storage systems continue to increase, the number of series/voltage levels of batteries is also rising. For energy storage charging, POWERQUARK offers a full range of products from 1 to 16 series.
Conclusion
The newly launched PQ8808 further extends the input voltage to 80V, significantly increasing the number of battery packs that can be charged and providing efficient and safe support and protection for more charging scenarios.
