The RT9027A/B is a high performance positive voltage regulator designed for very low dropout voltage up to 0.5 Amps. The V_SET voltage must be larger than 1V to guarantee that V_OUT is 1.6 times of V_SET. When V_SET is less than 1V, the IC will be shutdown. The FON pin turns V_OUT to fully-on when FON is given low. For RT9027B (EN version), FON pin is equivalent to EN pin. The RT9027A/B provides excellent regulation over variations in line, load and temperature. The RT9027A/B is available in the SOP-8 package.