Chipown Launches PN8309P, A Highly Integrated 65V MOSFET Synchronous Rectifier

As small-form-factor and energy-efficient designs become the standard for low-to-medium power PD chargers and high-density adapters, power consumption and space utilization in the secondary rectification stage have become critical design considerations. Leading domestic semiconductor manufacturer Chipown has introduced the next-generation, highly integrated synchronous rectifier: the PN8309P. Specifically designed for secondary-side rectification in AC/DC flyback systems, this chip revolutionizes design by integrating a high-precision synchronous rectification controller with a 65V, 8mΩ N-channel power MOSFET into a single package. By replacing traditional, high-loss Schottky diodes, the PN8309P significantly eliminates secondary conduction losses and enhances energy efficiency, while its extreme integration helps power supply manufacturers reduce BOM costs and simplify PCB layouts, making it an ideal choice for high-density, low-to-medium power supply designs.

The core technical breakthrough of the Chipown PN8309P lies in its powerful, flexible topology control algorithms and exceptionally wide voltage adaptability, offering excellent compatibility with DCM, QR, and the more technically demanding CCM operating modes. Under CCM conditions, the chip utilizes proprietary current-tracking turn-off technology to perform real-time dynamic monitoring of the rectifier's current decay, allowing for precise control of MOSFET shut-off timing to fundamentally eliminate shoot-through risks and increase system safety margins. To accommodate complex peripheral wiring, the PN8309P incorporates high-voltage self-power technology to support auxiliary-winding-free high-side rectification, while integrating dual-supply technology to broaden the output range to 3.3V–12V for mainstream fast-charging applications. Housed in an SOP8 package, the chip supports a rated power output of 48W (12V/4A) across a 90–265VAC input range, incorporating hardware-level under-voltage and timing protections to ensure secondary-side safety.

The mass production of the Chipown PN8309P marks a generational shift toward "all-in-one" secondary rectification, where the control core and an ultra-low 8mΩ power MOSFET are combined into a single SOP8 package. By nearly eliminating the need for peripheral circuitry, the chip significantly relieves thermal and stacking pressures within compact housings such as 45W–48W PD chargers and router adapters. With its combination of low conduction losses, dynamic current-tracking capabilities, and high application flexibility, the PN8309P provides a cost-effective and engineering-ready template for the efficient miniaturization of modern consumer electronics adapters.