Texas Instruments LMG2652 650V 140mΩ GaN Power-FET Half Bridge
Texas Instruments LMG2652 650V 140mΩ GaN Power-FET Half-Bridge simplifies design, reduces component count, and reduces board space. This simplification is done by integrating half-bridge power FETs, gate drivers, bootstrap diode, and high-side gate-drive level shifter in a 6mm by 8mm QFN package. The low-side current-sense emulation reduces power dissipation compared to the traditional current-sense resistor. It allows the low-side thermal pad to be connected to the cooling 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 LMG2652 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.
Features
- 650V GaN power-FET half-bridge
- 140mΩ low-side and high-side GaN FETs
- Integrated gate drivers with <100ns low propagation delays
- 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 USB wall outlet power supplies
- AC/DC auxiliary power supplies
- Mobile wall charger design
- USB wall power outlet
Additional Resources
Simplified Block Diagram
Development Tool
Texas Instruments LMG2652EVM-101 Daughter Card Evaluation Module
Offers a quick & easy platform for evaluating TI-integrated GaN devices in any half-bridge topology.