Analog DevicesLT8418ACBZ-R7Gate and Power Drivers

LT8418: 100V Half-Bridge GaN Driver with Smart Integrated Bootstrap Switch

The LT8418 is a 100V half-bridge GaN driver that integrates top and bottom driver stages, driver logic control, and protections. It can be configured into synchronous half-bridge, full-bridge topologies, or buck, boost, and buck-boost topologies.

The LT8418 provides strong current sourcing/sinking capability with 0.6Ω pull-up and 0.2Ω pull-down resistance. It also integrates smart integrated bootstrap switch to generate a balanced bootstrap voltage from V_CCs 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. Meanwhile, the LT8418 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 the WLCSP package to minimize parasitic inductance, enabling its wide use in high-performance and high-power density applications.

Key Features and Benefits

• •  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 Propagation Delay: 10ns (Typical)
• •  Propagation Delay Matching: 1.5ns (Typical)
• •  Balanced Driver Supply Voltage: V_BST ≈ V_CC = 3.85V – 5.5V
• •  Undervoltage and Overvoltage Lockout Protections
• •  Small 12-Ball WLCSP Package

Applications

• •  High Frequency DC-DC Switching Power Converters
• •  Half-Bridge, Full-Bridge, Push-Pull Converters
• •  Data Center Power Supplies
• •  Motor Drivers, Class-D Audio Amplifiers
• •  Consumer, Industrial, and Automotive

Evaluation Board

The LT8418 can be evaluated with the EVAL-LT8418-BZ or the EVAL-LT8418-AZ.

Block Diagrams and Tables