LT8418

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • 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

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
LT8418
100V Half-Bridge GaN Driver with Smart Integrated Bootstrap Switch
LT8418 Pin Configuration LT8418 Typical Application
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Documentation

Data Sheet 1

User Guide 1

Technical Articles 1

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT8418
LTspice

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.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
EVAL-LT8418-BZ

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

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Product Details

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.

eval board
schematic 4
schematic 5
schematic 6
EVAL-LT8418-AZ

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

Buy Now View Details

Product Details

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.
EVAL-LT8418-BZ
100V Half-Bridge GaN Driver with Smart Integrated Bootstrap Switch
EVAL-LT8418 Board Photo Angle View EVAL-LT8418 Board Photo Top View EVAL-LT8418 Board Photo Bottom View
EVAL-LT8418-AZ
100V Half-Bridge GaN Driver with Smart Integrated Bootstrap Switch
EVAL-LT8418-AZ Board Photo Angle View EVAL-LT8418-AZ Board Photo Top View EVAL-LT8418-AZ Board Photo Bottom View

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