Analog Reinvented

ES9311Q

Dual, Ultra-Low Noise Linear Regulator

Datasheet

ESS TECHNOLOGY, INC. 109 Bonaventura Dr. San Jose, CA 95134, USA. Tel (408) 643-

8800 • WWW.ESSTECH.COM

FEATURE

BENEFIT

o Dual outputs with 300mA total load

o < 1µVrms output noise (100Hz to 100kHz)

o Operating from +3.5V to +5.5V

o Excellent line and load regulation

o

Dual regulator minimizes board space requirements

o

Low noise is required to achieve high converter DNR

o

Wide supply range operation

o

Maintains accurate Vout with line/load variations

o Remote sensing for each output

o

Enables excellent load regulation, typically 16mV/A

o Five enable inputs and four status outputs

o

Provides design flexibility and host communications

o Over-current & over-temperature protection

o

Protects regulator against system fault conditions

o 3.5mA total quiescent current

o

Suitable for USB and battery powered designs

o 30-QFN package, 3mm x 5mm

o

Minimizes PCB footprint

The ES9311Q Dual, Ultra-Low Noise Linear Regulator

is the industry’s highest-performance, ultra-low noise

regulator optimized to supply the reference voltages for ESS’ 32-Bit SABRE DACs and ADCs. Audio DACs

require a very low-noise

reference voltage to achieve high dynamic range (DNR). The ES9311’s output noise

is typically under 1µVrms from 100Hz to 100kHz, and less than 1.3µVrms from 10Hz to 100kHz.

The

temperature coefficient of each voltage output is typically 50ppm/°C. The dual regulator replaces three active

devices and several discrete components used previously to produce a high-performance, low-noise regulator.

The ES9311Q enables ESS’ Flagship 8-Channel DAC, the ES9038PRO, to achieve its full 140dB DNR and is

an ideal low-

noise regulator for use with all ESS’ 32-Bit SABRE® DACs.

The ES9311Q provides several unique features not available in commodity regulators: the two outputs require

no decoupling capacitors, remote load sensing ensures output voltage accuracy right at the load, there are two

output enable inputs, the outputs have a soft-start function, plus power-good, over-temperature warning, and

over-temperature shutdown outputs.

The ES9311Q Dual, Ultra-Low Noise Linear Regulator is available in a 30-pin, 3mm x 5mm QFN package.