UCC27284 Half-Bridge Gate Driver

Texas Instruments' UCC27284 is a robust N-channel MOSFET driver with a switch-node (HS) voltage rating of 100 V (maximum). It allows for two N-channel MOSFETs to be controlled in half-bridge or synchronous buck configuration-based topologies. The 3 A peak source and sink current with low pull-up/pulldown resistance allows the UCC27284 to drive large power MOSFETs with minimum switching losses during the transition of the MOSFET Miller plateau.

The inputs are independent of the supply voltage, allowing the driver to be used in conjunction with analog and digital controllers. Two inputs and outputs can be overlapped, if needed, in applications such as secondary-side full-bridge synchronous rectification. The input pins and the HS pin can tolerate significant negative voltage which improves system robustness. The enable and disable functionality provides additional system flexibility by reducing the gate driver power consumption and quickly responding to fault events within the system. The 5 V undervoltage lockout (UVLO) allows systems to operate at lower bias voltages that are necessary for many high-frequency applications and improves system efficiency in certain operating modes.

Small propagation delay and delay matching specifications minimize the dead-time requirement which further improves efficiency. The UVLO is provided for the high-side and low-side driver stages, forcing the outputs low if the V_DD voltage is below the specified threshold. An integrated bootstrap diode eliminates the need for an external discrete diode in many applications, saving board space and reducing system costs. The UCC27284 is offered in a small package enabling high-density designs.