Precision voltage reference drives up to 200mA
A precision voltage reference that incorporates two high current output buffers has been announced by Linear Technology. Based on a 2.5V bandgap voltage reference, each output of the LT6658 can be separately configured for any voltage between 2.5V and 6V. Both outputs offer 0.05% initial accuracy, 10ppm/°C temperature drift and 1.5ppm of low frequency noise.
The outputs can drive up to 50mA and 150mA, respectively, and sink up to 20mA. Typical load regulation is only 0.1ppm/mA with up to 150mA of load current. In parallel, the buffer outputs can be combined for even higher current capability.
The LT6658 is useful for driving the reference input for a high resolution ADC or DAC using one output, while simultaneously supplying power to other devices using the second output. Both outputs track each other over temperature and load, allowing them to address applications requiring ratiometric supply rails. The outputs have supply rejection and are stable with up to 50μF over the entire specified operating range. With this output capability, the LT6658 can serve as both reference and regulator combined. Alternatively, the LT6658 can be used to generate a reference plus a virtual ground, or as two matched, tracking references.
“The increasing customer demand for precision voltage references with regulator-like drive has inspired us to create these ultra-buffered references,” said Brendan Whelan, Design Manager for Linear Technology. “The result is the LT6658 Refulator.”
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