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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
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | Fl (mm) | L (µH) | IRP,40K (A) | ISAT,30% (A) | RDC typ. (mΩ) | RDC max. (mΩ) | fres (MHz) | Mount | Ti | Ø OD (mm) | Ø ID (mm) | Qty. | κ (W/(m*K)) | Pins (Value) (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885012206046 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 16 V(DC) | 100 nF | ±10% | 16 | 0603 | -55 °C up to +125 °C | 3.5 | 5 GΩ | X7R Class II | 1.6 | 0.8 | 0.4 | – | – | – | – | – | – | – | – | – | – | 4000 | – | – | – | 0.8 | – | – | – | 7" Tape & Reel | ||
 | 9774010151R | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WA-SMSI SMT Steel Spacer with internal Thread M2.5 | – | – | – | – | -55 °C up to +150 °C | – | – | – | 1 | – | – | – | – | – | – | – | – | – | M2.5 | 5.1 | 3.5 | 1500 | – | – | – | – | – | – | – | Tape and Reel | |
 | 60800213421 | SPEC | – | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | – | -25 °C up to +105 °C | – | 1000 MΩ | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 1000 | – | 2 | – | – | Jumper | – | 3 | Bag | |
 | 62000311121 | SPEC | – | 6 files | Active i| Production is active. Expected lifetime: >10 years. | WR-PHD 2.00 mm THT Pin Header | – | – | – | – | -40 °C up to +105 °C | – | 1000 MΩ | – | 6 | – | – | – | – | – | – | – | – | THT | – | – | – | 1000 | – | 3 | Single | – | Pin Header | Straight | 2 | Bag | |
 | 74439369047 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-XHMI SMT Power Inductor | – | – | – | 1090 | -40 °C up to +125 °C | – | – | – | 11.6 | 10.5 | – | 4.7 | 20 | 28.05 | 5 | 5.5 | 21 | SMT | – | – | – | 300 | – | 2 | – | 8.8 | – | – | 13.5 | – | ||
 | 4051100100017 | SPEC | – | 3 files | Active i| Production is active. Expected lifetime: >10 years. | WE-TGS Graphite Sheet | – | – | – | – | -50 °C up to +120 °C | – | – | – | 100 | 100 | – | – | – | – | – | – | – | – | – | – | – | – | 1800 | – | – | 0.037 | – | – | – | – |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885012206046 | SPEC | |
| 9774010151R | SPEC | – |
| 60800213421 | SPEC | – |
| 62000311121 | SPEC | – |
| 74439369047 | SPEC | |
| 4051100100017 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | Fl (mm) | L (µH) | IRP,40K (A) | ISAT,30% (A) | RDC typ. (mΩ) | RDC max. (mΩ) | fres (MHz) | Mount | Ti | Ø OD (mm) | Ø ID (mm) | Qty. | κ (W/(m*K)) | Pins (Value) (pcs) | Rows | H (mm) | Gender | Type | IR (A) | Packaging | Samples |
|---|