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GaN reference design enables 2-MHz DC/DC conversion


A demo board combines EPC’s eGaN FET with Analog Devices’ GaN buck controller to achieve fast switching at up to 2 MHz. The EPC9160 is a dual-output synchronous buck converter reference design board that converts an input voltage of 9 V to 24 V to a 3.3-V or 5-V output voltage and delivers up to 15 A continuous current for both outputs.

Converter size is just 23×22 mm, and the inductor height is only 3 mm. The high density and thickness of the DC/DC converter design, plus the 2-MHz switching frequency, make it well-suited for automotive console applications, as well as computing, industrial, consumer, and telecom power systems. eGaN FETs provide the fast switching, high efficiency, and small size required to meet the power density demands of these applications.

The EPC9160 reference design employs the EPC2055 enhancement-mode GaN FET and the LTC7890 two-phase analog buck controller with integrated GaN drivers. Designed to exploit the performance of EPC eGaN FETs, the LTC7890 100-V, low IQ controller offers optimized near-zero deadtime or programmable deadtime and programmable switching frequency up to 3 MHz. Quiescent current of 5 µA (VIN = 48 V, VOUT = 5 V, CH1 only) enables very low standby power consumption.

Occupying a footprint of just 2.5×1.5 mm, the EPC2055 40-V eGaN FET provides a maximum on-resistance of 3 mΩ and can deliver up to 29 A continuous current, 161 A peak. Its strong dynamic parameters allow for very small switching losses at 2 MHz.

The efficiency of the EPC9160 demo board is greater than 93% with a 5-V output and 24-V input. In addition to a light-load operating mode and adjustable deadtime, the board offers undervoltage lockout, overcurrent protection, and power-good output.

The EPC9160 development board costs $300 and is available for immediate delivery from Digi-Key.

EPC9160 product page

EPC

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