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1 Features

? Drives two N-channel MOSFETs in high-side lowside

configuration

? 5-V typical undervoltage lockout

? Enable/disable functionality in DRC package

? 16-ns typical propagation delay

? 12-ns rise, 10-ns fall time with 1.8-nF load

? 1-ns typical delay matching

? 5-V negative voltage handling on inputs

? 14-V negative voltage handling on HS

? ±3-A peak output current

? Absolute maximum boot voltage 120 V

? Low current (7-μA) consumption when disabled

? Integrated bootstrap diode

? Specified from –40°C to 140°C junction

temperature

2 Applications

? Merchant network and server PSU

? Merchant telecom rectifiers

? DC input BLDC motor drive

? Test and measurement equipment

? Solar power optimizer

3 Description

The UCC27284 is a robust N-channel MOSFET driver

with a maximum switch node (HS) voltage rating

of 100 V. It allows for two N-channel MOSFETs

to be controlled in half-bridge or synchronous buck

configuration-based topologies. Its 3-A peak source

and sink current along with low pull-up and pulldown

resistance allows the UCC27284 to drive large

power MOSFETs with minimum switching losses

during the transition of the MOSFET Miller plateau.

Since the inputs are independent of the supply

voltage, UCC27284 can be used in conjunction with

both analog and digital controllers. Two inputs, and

therefore outputs, can be overlapped, if needed,

in applications such as secondary side full-bridge

synchronous rectification.

The input pins as well as the HS pin are

able to 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 responds to fault events within the system.

5-V UVLO allows systems to operate at lower bias

voltages, which is necessary in 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.

Undervoltage lockout (UVLO) is provided for both

the high-side and low-side driver stages forcing the

outputs low if the VDD voltage is below the specified

threshold. An integrated bootstrap diode eliminates

the need for an external discrete diode in many

applications, which saves board space and reduces

system cost. UCC27284 is offered in a small package

enabling high density designs.