ESS Technology 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.

The ES9311 consists of a low-noise bandgap voltage reference, two high-performance low-noise low-dropout buffers, protection circuitry against over-current, and over-temperature fault conditions, plus control logic and signaling. The regulated outputs use remote sensing to maintain voltage accuracy at the load under varying load currents, and the output voltage can be trimmed to be exactly +3.3V.

The ESS Technology ES9311 LDO Regulator is offered in a compact QFN30 package, ideal for space-constrained applications.

Features

Output voltage noise is <1μVrms from 100Hz to 100kHz
Maintains high DNR when used as the voltage reference on audio converters
Four active-low status outputs
Power Good signals for each output
Over-temperature warning at +105°C
Over-temperature shutdown at +130°C
Under-Voltage Lockout (UVLO) function to stop voltages appearing on the +3.3V outputs when the supply voltage is less than +3V

Prevents unwanted noise from being injected into audio DACs or ADCs at startup
Three enable inputs: one each for the two outputs, and one to enable or disable the over-temperature shutdown (OTS) function
QFN30 package

Applications

High-Resolution Audio (HRA) music players and converters
Analog converters

Smartphones
Headphone amplifiers

ESS Technology ES9311 LDO Regulator

Features

Applications

Block Diagram

Audio Circuit with SABRE DAC

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