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Analog Devices LT8418 | Demoboard EVAL-LT8418-BZ
100V Half-Bridge GaN Driver with Smart Integrated Bootstrap Switch
Overview
| Topology | Half-Bridge Converter symmetrical isolated |
| Input voltage | 80 V |
| Switching frequency | 100-10000 kHz |
| Output 1 | 80 V / 10 A |
Description
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.
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
Typical applications
- Automotive
- Consumer
- Data Center Power Supplies
- Industrial
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Size | DF(%) | RISO | Ceramic Type | W(mm) | Fl(mm) | Packaging | L(µH) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | RDC max.(mΩ) | fres(MHz) | Ti | Ø OD(mm) | Ø ID(mm) | Qty. | κ(W/(m*K)) | Pins | Type | Mount | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| WCAP-CSGP MLCCs 16 V(DC), 100 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 16 V(DC) | Capacitance100 nF | Capacitance±10% | Rated Voltage16 V (DC) | Size0603 | Dissipation Factor3.5 % | Insulation Resistance5 GΩ | Ceramic TypeX7R Class II | Width0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | – | – | – | – | – | – | – | – | – | Packaging Unit4000 | – | – | – | – | Length1.6 mm | Height0.8 mm | – | – | Operating Temperature -55 °C up to +125 °C | |||||
 | WA-SMSI SMT Steel Spacer with internal Thread M2.5, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SMSI SMT Steel Spacer with internal Thread M2.5 | – | – | – | – | – | – | – | – | – | PackagingTape and Reel | – | – | – | – | – | – | Inner ThreadM2.5 | Outer Diameter5.1 mm | Inner Diameter3.5 mm | Packaging Unit1500 | – | – | – | – | Length1 mm | – | – | – | Operating Temperature -55 °C up to +150 °C | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | Insulation Resistance1000 MΩ | – | – | – | PackagingBag | – | – | – | – | – | – | – | – | – | Packaging Unit1000 | – | Pins2 | – | – | – | – | Rated Current3 A | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | Insulation Resistance1000 MΩ | – | – | – | PackagingBag | – | – | – | – | – | – | – | – | – | Packaging Unit1000 | – | Pins3 | TypeStraight | MountTHT | Length6 mm | – | Rated Current2 A | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | |||
 | WE-XHMI SMT Power Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-XHMI SMT Power Inductor | – | – | – | Size1090 | – | – | – | Width10.5 mm | – | – | Inductance4.7 µH | Performance Rated Current20 A | Saturation Current @ 30%28.05 A | DC Resistance5 mΩ | DC Resistance5.5 mΩ | Self Resonant Frequency21 MHz | – | – | – | Packaging Unit300 | – | Pins2 | – | MountSMT | Length11.6 mm | Height8.8 mm | Rated Current13.5 A | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WE-TGS Graphite Sheet, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TGS Graphite Sheet | – | – | – | – | – | – | – | Width100 mm | – | – | – | – | – | – | – | – | – | – | – | – | Thermal Conductivity1800 W/(m*K) | – | – | – | Length100 mm | Height0.037 mm | – | – | Operating Temperature -50 °C up to +120 °C |