ST to expand power GaN options as production starts
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STMicroelectronics is expanding the packaging options for its enhanced-mode PowerGaN HEMT high-electron-mobility transistors as it starts volume production.
The ST power GaN transistors are aimed at applications such as wall adapters, chargers, lighting systems, industrial power supplies, renewable energy applications, and in automotive electrification.
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The first two products in the family, the SGT120R65AL and SGT65R65AL, are industrial-qualified 650V normally-off G-HEMT devices in a PowerFLAT 5×6 HV surface-mount package. They have current ratings of 15A and 25A, respectively, with typical on-resistance (RDS(on)) of 75mΩ and 49mΩ at 25°C.
The 3nC and 5.4nC total gate charge and low parasitic capacitances ensure minimal turn-on/turn-off energy losses and a fourth Kelvin source connection allows optimized gate driving. In addition to the reduced size and weight of the power supplies and adapters, the two GaN transistors provide higher efficiency, lower operating temperature, and extended life time.
In the coming months, ST will introduce new PowerGaN variants for automotive-qualified devices, as well as additional power-package options including PowerFLAT 8×8 DSC and LFPAK 12×12 for high power applications.
HEMT GaN transistors with the same breakdown voltage and RDS(on) as silicon alternatives can achieve lower total gate charge and parasitic capacitances, with zero reverse-recovery charge. These properties raise efficiency and enhance switching performance, allowing higher switching frequency that permits smaller passive components thereby increasing power density. Applications can therefore become smaller with higher performance.
In the future, GaN is also expected to enable new power-conversion topologies with higher frequencies that will further improve efficiency and decrease power losses. GaN Systems has just signed a deal with UK startup QPT to run the transistors at frequencies up to 20MHz.
ST has high production capacity for PowerGaN discrete products to support customer demand for a very fast ramp to volume manufacturing. The SGT120R65AL and SGT65R65AL in PowerFLAT 5×6 HV are available now, priced from $2.60 (SGT120R65AL) and $5.00 (SGT65R65AL) for orders of 100 pieces.
www.st.com/g-hemt-gan-transistors
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