REG1117/REG1117A Positive Regulator Texas Instruments REG1117/REG1117A Positive Regulators are an easy-to-use three-terminal voltage regulator. The TI REG1117/REG1117A positive regulator features 1A max output current and dropout voltage of 1.3V max at Io=1A. The Texas Instruments REG1117/REG1117A positive regulator is designed for use with a variety of applications, including SCSI-2 active termination, hand-held data collection devices, high-efficiency linear regulators, battery-powered instrumentation, and more.