AP7361E Low Dropout Regulator Diodes Inc. AP7361E Low Dropout (LDO) Regulator is a 1A, adjustable and fixed output voltage, and ultra-low dropout linear regulator with enable. This device includes passelement, error amplifier, band-gap reference, current limit, and thermal shutdown circuitry. The AP7361E comes with characteristics of low dropout voltage and low quiescent current making it suitable for low to medium power applications. This regulator is turned on when the EN pin is set to a logic high level.