Texas Instruments LMG2656 650V GaN Power-FET Half Bridge
Texas Instruments LMG2656 650V GaN Power-FET Half Bridge simplifies design, reduces component count, and reduces board space by integrating half-bridge power FETs, gate drivers, bootstrap FET, and high-side gate-drive level shifter in a 6mm by 8mm QFN package. Programmable turn-on slew rates provide EMI and ringing control. The low-side current-sense emulation reduces power dissipation compared to the traditional current-sense resistor and allows the low-side thermal pad to be connected to PCB power ground.
The high-side GaN power FET can be controlled with either the low-side referenced gate-drive pin (INH) or the high-side referenced gate-drive pin (GDH). The high-side gate-drive signal level shifter reliably transmits the INH pin signal to the high-side gate driver in challenging power switching environments. The smart-switched GaN bootstrap FET has no diode forward-voltage drop, avoids overcharging the high-side supply, and has zero reverse-recovery charge.
The Texas Instruments LMG2656 supports converter light-load efficiency requirements and burst-mode operation with low quiescent currents and fast start-up times. Protection features include FET turn-on interlock, under-voltage lockout (UVLO), cycle-by-cycle current limit, and over-temperature shutdown. Ultra-low slew rate setting supports motor drive applications.
Features
- 650V GaN power-FET half bridge
- 230mΩ low-side and high-side GaN FETs
- Integrated gate drivers with <100ns low propagation delays
- Programmable turn-on slew rate control
- Current-sense emulation with high bandwidth and high accuracy
- Low-side referenced (INH) and high-side referenced (GDH) high-side gate drive pins
- Low-side (INL)/high-side (INH) gate-drive interlock
- High-side (INH) gate-drive signal level shifter
- Smart-switched bootstrap diode function
- High-side start up of <8µs
- Low-side/high-side cycle-by-cycle overcurrent protection
- Overtemperature protection
- AUX idle quiescent current of 250µA
- AUX standby quiescent current of 50µA
- BST idle quiescent current of 70µA
- 8mm × 6mm QFN package with dual thermal pads
Applications
- AC/DC adapters and chargers
- AC/DC auxiliary power supplies
- Mobile wall charger design
- USB wall power outlet
Functional Block Diagram
Development Tool
Texas Instruments LMG2656EVM-102 Daughter Card Evaluation Module
Offers a quick & easy platform for evaluating TI-integrated GaN devices in any half-bridge topology.