Datasheet LT8418 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 100V Half-Bridge GaN Driver with Smart Integrated Bootstrap Switch in WLCSP-12 package |
| Pages / Page | 19 / 1 — Data Sheet. LT8418. FEATURES. GENERAL DESCRIPTION. Half-Bridge Gate … |
| File Format / Size | PDF / 697 Kb |
| Document Language | English |
Data Sheet. LT8418. FEATURES. GENERAL DESCRIPTION. Half-Bridge Gate Driver for GaN FETs
Model Line for this Datasheet
Text Version of Document
Data Sheet LT8418
100V Half-Bridge GaN Driver with Smart Integrated Bootstrap Switch
FEATURES GENERAL DESCRIPTION
Half-Bridge Gate Driver for GaN FETs
The LT8418 is a 100V half-bridge GaN driver that
0.6Ω Pull-Up Resistance at Top Gate Driver
integrates top and bottom driver stages, driver logic control, and protections. It can be configured into
0.2Ω Pull-Down Resistance at Bottom Gate Driver
synchronous half-bridge, full-bridge topologies, or
4A Peak Source, 8A Peak Sink Current Capability
buck, boost, and buck-boost topologies. The LT8418 provides strong current sourcing/sinking capability with
Smart Integrated Bootstrap Switch
0.6Ω pull-up and 0.2Ω pull-down resistance. It also
Split-Gate-Driver to Adjust Turn-On/Turn-Off Strength
integrates smart integrated bootstrap switch to
Default Low-State for All Driver Inputs and Outputs
generate a balanced bootstrap voltage from VCC with a minimum dropout voltage.
Maximum 15V Voltage Rating at INT and INB Inputs
Independent INT, INB Inputs with TTL Logic Compatible
The LT8418 provides split gate drivers to adjust the turn- on and turn-off slew rates of GaN FETs to suppress
Fast Propagation Delay: 10ns (Typical)
ringing and optimize EMI performance. All driver inputs
Propagation Delay Matching: 1.5ns (Typical)
and outputs have default low-state to prevent GaN FETs
Balanced Driver Supply Voltage: V
from false turn-on. The inputs of the LT8418, INT, and
BST ≈ VCC = 3.85V – 5.5V
INB are independent and TTL logic compatible. Undervoltage and Overvoltage Lockout Protections Meanwhile, the LT8418 performs with a fast propagation Small 12-Ball WLCSP Package delay of 10ns and maintains an excellent delay matching of 1.5ns between the top and bottom channels, making
APPLICATIONS
it suitable for high-frequency DC-DC converters, motor drivers, and class-D audio amplifiers. In addition, the High Frequency DC-DC Switching Power Converters LT8418 employs the WLCSP package to minimize Half-Bridge, Full-Bridge, Push-Pull Converters parasitic inductance, enabling its wide use in high- Data Center Power Supplies performance and high-power density applications. Motor Drivers, Class-D Audio Amplifiers Consumer, Industrial, and Automotive
TYPICAL APPLICATION 3.3Ω VIN 100V MAX 10µF 0.1µF BST TGP SW TGN GaN FET VCC V SW CC 3.85V TO 5.5V 4.7µF LT8418 10µH 3.3Ω VOUT TOP SIDE INPUT: INT INT BGP 100V MAX 10µF BOTTOM SIDE INPUT: INB INB BGN GaN FET V GND CC 0.1µF
001
Figure 1. Highly Efficient GaN-Based Switching DC-DC Converter
Pre-release Rev 0
DOCUMENT FEEDBACK TECHNICAL SUPPORT
One Analog Wa y, Wilmington, MA 01887 -2356, U.S.A. Tel: 781.329.47 00 ©2023 Analog Devices, Inc. Al l rights rese rve d. Document Outline Features Applications General Description Typical Application TABLE OF CONTENTS Revision History Specifications Timing Diagrams Absolute Maximum Ratings Thermal Resistance Pin Configurations and Function Descriptions Pin Descriptions Block diagram Typical Performance Characteristics Theory of Operation 1.1. Chip Start-up, VCC UVLO/OVLO Protections 1.2. Input Interface INT, INB 1.3. Smart Bootstrap (BST) Switch and BST UVLO 1.4. Split Gate Driver Applications Information 1.1. Selecting the VCC and BST Capacitor 1.2. Selecting the Gate Resistance 1.3. Power Dissipation 1.4. PCB Bypass and Grounding Guideline 1.5. Soldering Guideline Outline Dimensions Typical Applications Ordering Guide Related Parts
100V Half-Bridge GaN Driver with Smart Integrated Bootstrap Switch
FEATURES GENERAL DESCRIPTION
Half-Bridge Gate Driver for GaN FETs
The LT8418 is a 100V half-bridge GaN driver that
0.6Ω Pull-Up Resistance at Top Gate Driver
integrates top and bottom driver stages, driver logic control, and protections. It can be configured into
0.2Ω Pull-Down Resistance at Bottom Gate Driver
synchronous half-bridge, full-bridge topologies, or
4A Peak Source, 8A Peak Sink Current Capability
buck, boost, and buck-boost topologies. The LT8418 provides strong current sourcing/sinking capability with
Smart Integrated Bootstrap Switch
0.6Ω pull-up and 0.2Ω pull-down resistance. It also
Split-Gate-Driver to Adjust Turn-On/Turn-Off Strength
integrates smart integrated bootstrap switch to
Default Low-State for All Driver Inputs and Outputs
generate a balanced bootstrap voltage from VCC with a minimum dropout voltage.
Maximum 15V Voltage Rating at INT and INB Inputs
Independent INT, INB Inputs with TTL Logic Compatible
The LT8418 provides split gate drivers to adjust the turn- on and turn-off slew rates of GaN FETs to suppress
Fast Propagation Delay: 10ns (Typical)
ringing and optimize EMI performance. All driver inputs
Propagation Delay Matching: 1.5ns (Typical)
and outputs have default low-state to prevent GaN FETs
Balanced Driver Supply Voltage: V
from false turn-on. The inputs of the LT8418, INT, and
BST ≈ VCC = 3.85V – 5.5V
INB are independent and TTL logic compatible. Undervoltage and Overvoltage Lockout Protections Meanwhile, the LT8418 performs with a fast propagation Small 12-Ball WLCSP Package delay of 10ns and maintains an excellent delay matching of 1.5ns between the top and bottom channels, making
APPLICATIONS
it suitable for high-frequency DC-DC converters, motor drivers, and class-D audio amplifiers. In addition, the High Frequency DC-DC Switching Power Converters LT8418 employs the WLCSP package to minimize Half-Bridge, Full-Bridge, Push-Pull Converters parasitic inductance, enabling its wide use in high- Data Center Power Supplies performance and high-power density applications. Motor Drivers, Class-D Audio Amplifiers Consumer, Industrial, and Automotive
TYPICAL APPLICATION 3.3Ω VIN 100V MAX 10µF 0.1µF BST TGP SW TGN GaN FET VCC V SW CC 3.85V TO 5.5V 4.7µF LT8418 10µH 3.3Ω VOUT TOP SIDE INPUT: INT INT BGP 100V MAX 10µF BOTTOM SIDE INPUT: INB INB BGN GaN FET V GND CC 0.1µF
001
Figure 1. Highly Efficient GaN-Based Switching DC-DC Converter
Pre-release Rev 0
DOCUMENT FEEDBACK TECHNICAL SUPPORT
One Analog Wa y, Wilmington, MA 01887 -2356, U.S.A. Tel: 781.329.47 00 ©2023 Analog Devices, Inc. Al l rights rese rve d. Document Outline Features Applications General Description Typical Application TABLE OF CONTENTS Revision History Specifications Timing Diagrams Absolute Maximum Ratings Thermal Resistance Pin Configurations and Function Descriptions Pin Descriptions Block diagram Typical Performance Characteristics Theory of Operation 1.1. Chip Start-up, VCC UVLO/OVLO Protections 1.2. Input Interface INT, INB 1.3. Smart Bootstrap (BST) Switch and BST UVLO 1.4. Split Gate Driver Applications Information 1.1. Selecting the VCC and BST Capacitor 1.2. Selecting the Gate Resistance 1.3. Power Dissipation 1.4. PCB Bypass and Grounding Guideline 1.5. Soldering Guideline Outline Dimensions Typical Applications Ordering Guide Related Parts