Since Apple released AirPods earphones in 2016, TWS earphones have become increasingly popular due to their advantages such as easy portability and intelligent voice recognition. Major manufacturers have successively launched their own TWS earphones.

At the same time, the charging solution for TWS earphones is constantly evolving towards higher efficiency, longer standby time, and higher integration. Prisemi has seized this trend in the market and launched a high integration charging management chip PB15305, which solves the requirements of multi output, light load, low power consumption, and small space for wearable devices such as TWS charging boxes. Several typical LED display solutions have been solidified, Optimized the BOM cost of MCU resource allocation and charging management scheme.

<PB15305 VS ordinary chip>

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BOM has high cost, large area, a large amount of materials, and is difficult to prepare.

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PB15305 is highly integrated, with low cost and small area, making material stocking so easy!

<PB15305 Main Features>

→ 2A high current fast charging, with a peak charging efficiency of up to 94%
→ Input 7V withstand voltage, built-in overvoltage protection
→ Input voltage self adjustment function to ensure normal power supply of the charging system
→ Can provide charging cut-off voltage setting range of 3.6V~4.433V
→ In discharge mode, automatic recognition function for light load (optional), automatically exits BOOST when light load occurs
→ The static power consumption at the battery end is as low as 10uA
→ Supports RGB battery level display and charging indicator function, with a flashing indicator when the battery is low
→ Supports NTC temperature detection
→ Built in three 5V constant voltage outputs, with adjustable voltage in boost mode
→ Output current above 2A, peak efficiency 94%
→ Built in overvoltage protection, undervoltage protection, overcurrent protection

The PB15305 highly integrated charging management chip adopts a synchronous charging and discharging integrated structure with a common inductance, achieving high efficiency in switch charging without increasing the cost of peripheral devices.
Curing typical LED lights can display functions such as charging and discharging, battery level display, etc. on a single chip. (As shown in the customer’s motherboard diagram) ↓

PB15305 pioneered the implementation of two independent small current outputs, allowing each earphone to have a dedicated charging path, solving the problem of single earphone charging startup failure. Two small current outputs can not only meet the 3C charging requirements of the earphones, but also provide 150mA current limiting protection for each channel. The exit current can be accurately adjusted to 1-3mA, and the static power consumption can be further reduced to below 8uA, greatly extending the standby time. It is very suitable for charging TWS dual channel earphones. The other VOUT can provide up to 2A current output, providing a perfect solution for loads that require high current. At the same time, PB15305 integrates IIC communication interface, which not only enables software based charging and discharging management, but also enables multi project sharing solutions. (As shown in the figure below, complex applications can be achieved) ↓

PB15305 adopts mobile charger technology, with excellent charging details and performance, and a safe and standardized charging strategy. Not only does it support battery temperature detection and protection function, but it also supports overvoltage and overcurrent protection function in charge and discharge mode, and short circuit current limiting function is also complete. Maximizing the safety and reliability of the charging compartment. In addition, PB15305 is also equipped with a 5V resident version for low performance demand markets, with static power consumption as low as 45uA in constant voltage output mode.

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