LT8418
Info : RECOMMENDED FOR NEW DESIGNS
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LT8418

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 1
1ku List Price Starting From $1.68
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 Propagation Delay: 10ns (Typical)
  • Propagation Delay Matching: 1.5ns (Typical)
  • Balanced Driver Supply Voltage: VBST ≈ VCC = 3.85V – 5.5V
  • Undervoltage and Overvoltage Lockout Protections
  • Small 12-Ball WLCSP Package
Additional Details
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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 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. 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.

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
Part Models 1
1ku List Price Starting From $1.68

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT8418ACBZ-R7
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  • HTML
Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

EVAL-LT8418-BZ

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

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EVAL-LT8418-BZ

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

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

Product Detail

The EVAL-LT8418-BZ evaluation circuit features the LT8418 driving two 100V enhanced Gallium Nitride (eGaN) FETs in a half-bridge configuration. The circuit is optimized as a buck converter, but it can be used as a boost converter or other converter topologies consisting of a half-bridge. The evaluation circuit can deliver up to 10A with good thermal management.

An external single or two PWM signals are required to drive the board, depending on the configuration. In the single-input setup, the dead time circuitry on the board is utilized to generate the complement signal and set the dead time. The dead time circuitry is bypassed in the dual-input setup. The LT8418 driver has powerful 0.2Ω pull-down and 0.6Ω pull-up drivers driving two 100V GaN FETs. 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.

reference details image

EVAL-LT8418-AZ

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

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EVAL-LT8418-AZ

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

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

Product Detail

The EVAL-LT8418-AZ evaluation circuit features the LT8418 driving two 100V enhanced Gallium Nitride (eGaN) FETs in a half-bridge configuration. The circuit is optimized as a buck converter, but it can be used as a boost converter or other converter topologies consisting of a half-bridge. The evaluation circuit can deliver up to 10A with good thermal management.

An external single or two PWM signals are required to drive the board, depending on the configuration. In the single-input setup, the dead time circuitry on the board is utilized to generate the complement signal and set the dead time. The dead time circuitry is bypassed in the dual-input setup.

The LT8418 driver has powerful 0.2Ω pull-down and 0.6Ω pull-up drivers driving two 100V GaN FETs. 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.

Design files for this circuit board are available.

Tools & Simulations

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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