100V chip scale GaN driver has smart bootstrap

100V chip scale GaN driver has smart bootstrap

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By Nick Flaherty

Analog Devices (ADI) has launched a 100V half-bridge gate driver in a chip scale package that simplifies the implementation of GaN designs.

The LT8418 GaN gate driver integrates top and bottom driver stages, driver logic control and protections and can be configured into synchronous half-bridge, full-bridge topologies, or buck, boost, and buck-boost topologies.

The device provides strong current sourcing/sinking capability with 0.6Ω pull-up and 0.2Ω pull-down resistance for driving a variety of GaN FETs. It also integrates a smart integrated bootstrap switch to generate a balanced bootstrap voltage from VCC with a minimum dropout voltage and supports a 4A peak source and 8A peak sink current.

The LT8418 delivers split gate drivers to adjust the turn-on and turn-off slew rates of GaN FETs to suppress ringing and optimise EMI performance. All driver inputs and outputs have default low-state to prevent GaN FETs from false turn-on. The pulsed width modulation inputs of the LT8418, INT and INB, are independent and TTL logic compatible for precise control.

The LT8418 performs with a fast propagation delay of 10ns and maintains a delay matching of 1.5ns between the top and bottom channels, making it suitable for high-frequency DC-DC converters, motor drivers, and class-D audio amplifiers.

The 12 ball WLCSP chip scale package for the GaN gate driver measures 1.67 x 1.67mm and minimises parasitic inductance, enabling its wide use in high-performance and high-power density applications.

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