ES9311 LDO Regulator ESS Technology ES9311 LDO Regulator is a dual +3.3V, low-noise, low dropout regulator, optimized for use with high-performance Digital-to-Analog Converters (DACs), including the ESS SABRE DACs. Featuring a dual-regulator architecture, the ES9311 contains both series-voltage and shunt-voltage elements, eliminating the need for output decoupling capacitors. This device provides very low-noise outputs necessary for driving the reference inputs of high-resolution audio (HRA) converters.