Buck-boost MOSFET meets USB PD 3.1 demands
Occupying a small footprint to ease PCB design, the AONZ66412 MOSFET from Alpha & Omega targets buck-boost converters in USB PD 3.1 EPR applications. While the 3.1 Extended Power Range specification enables power delivery up to 240 W over a USB Type-C cable and connector, the AONZ66412 addresses the most commonly used power range of up to 140 W at 28 V.
The AONZ66412 combines two 40-V N-channel MOSFETs arranged in a half-bridge configuration within a symmetric XSPairFET 5×6-mm package. When used to replace two single 5×6-mm DFN packages, the compact AONZ66412 reduces PCB area, improves efficiency, and simplifies the layout of a 4-switch buck-boost architecture.
Alpha & Omega’s XSPairFET DFN is a bottom-side source package. Each high-side and low-side MOSFET provides a maximum on-resistance of 3.8 mΩ. The source of the low-side MOSFET is directly linked to a large paddle on the lead frame. This setup enhances thermal performance by enabling direct connection of the paddle to the PCB’s ground plane. When tested, the AONZ66412 demonstrated 97% efficiency at 1 MHz under typical USB PD 3.1 EPR conditions with a 28-V input, 17.6-V output, and 8-A load.
The AONZ66412 dual MOSFET costs $1.56 each in lots of 1000 units. It is available now in production quantities with a lead time of 16 weeks.
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