Precision voltage reference drives up to 200mA, stable vs load

November 03, 2016 // By Graham Prophet
Linear Technology is calling its latest IC a “refulator” as it combines the functions of voltage reference and voltage regulator; LT6658 is a precision voltage reference that incorporates two high current output buffers.

Based on a 2.5V bandgap voltage reference, each output 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 device’s outputs can drive up to 50 mA and 150 mA, respectively, and sink up to 20 mA. Typical load regulation is 0.1ppm/mA with up to 150 mA of load current. In parallel, the buffer outputs can be combined for even higher current capability. LT6658 is suitable 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 excellent supply rejection and are stable with up to 50 μF 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 LT6658 is currently available in a 2.5V version. Options for 1.2V, 1.8V, 3V, 3.3V, and 5V will be available in the first half of 2017. Prices start at $2.35 (1,000).


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