RP118x Ultra-Low Quiescent Current LDO Regulators Nisshinbo RP118x Ultra-Low Current Low-Dropout (LDO) Regulators offer ultra-low supply current up to 0.2µA. These regulators are ideal for applications with long service life and miniature-size battery requirements. The RP118x regulators feature an automatic operating mode that shifts between the fast response mode and low power mode.