Analog Devices Inc. LT8418 Half-Bridge GaN Driver
Analog Devices Inc. LT8418 Half-Bridge GaN Driver is a 100V device with integrated top and bottom driver stages, driver logic control, and protections. The driver can be configured into synchronous half-bridge, full-bridge topologies or buck, boost, and buck-boost topologies. LT8418 provides strong current sourcing/sinking capability with 0.6Ω pull-up and 0.2Ω pull-down resistance. It also integrates a smart integrated bootstrap switch to generate a balanced bootstrap voltage from VCC with a minimum dropout voltage.
The LT8418 provides split gate drivers to adjust the turn-on and turn-off slew rates of GaN FETs to suppress ringing and optimize EMI performance. All driver inputs and outputs have default low-state to prevent GaN FETs from false turn-on. The inputs of the LT8418, INT, and INB are independent and TTL logic compatible. The driver performs with a fast propagation delay of 10ns and maintains an excellent 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. In addition, the LT8418 employs a compact WLCSP package to minimize parasitic inductance, enabling its wide use in high-performance and high-power density applications.
Features
- Half-bridge gate driver for GaN FETs
- 0.6Ω pull-up resistance at top gate driver
- 0.2Ω pull-down resistance at bottom gate driver
- 4A peak source, 8A peak sink current capability
- Smart integrated bootstrap switch
- Split-gate-driver to adjust turn-on/turn-off strength
- Default low-state for all driver inputs and outputs
- Maximum 15V voltage rating at INT and INB inputs
- Independent INT, INB inputs with TTL logic compatible
- Fast 10ns typical propagation delay
- 1.5ns typical propagation delay matching
- 3.85V to 5.5V balanced driver supply voltage (VBST ≈ VCC)
- Undervoltage and overvoltage lockout protections
- Small 12-ball WLCSP package
- RoHS-compliant
Applications
- High-frequency DC-DC switching power converters
- Half-bridge, full-bridge, and push-pull converters
- Data center power supplies
- Motor drivers and class-D audio amplifiers
- Consumer
- Industrial
- Automotive
Typical Application
Block Diagram
Related Development Tools
Analog Devices Inc. EVAL-LT8418-xZ Evaluation Board
Features the LT8418 driving two 100V eGaN FETs in a half-bridge configuration.