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Analog Devices Inc. EVAL-LT3073-AZ Evaluation Board is configured to evaluate the operation of the LT3073. The LT3073 is a 3A, ultra-low noise, high power-supply rejection ratio (PSRR), and 45mV dropout ultra-fast linear regulator. The EVAL-LT3073-AZ requires an external BIAS voltage (VBIAS) that is at least 1.2V higher than VOUT and is between 2.375V and 5.5V.
The ADI LT3073 on the EVAL-LT3073-AZ requires few external components, simplifying a circuit design. The carefully printed circuit board (PCB) design helps optimize noise, PSRR, load transient response, and VOUT regulation performance. Meanwhile, the LT3073 requires capacitors for the internal reference, power input, BIASF pin, and power output. The internal reference is bypassed with a 16V, 0805 sized, 4.7μF capacitor to decrease output noise and program the soft-start. Larger capacitor case sizes and higher voltage ratings reduce 1/f noise for otherwise identical capacitors. The 22μF capacitor at the circuit output was selected for high-frequency PSRR performance and to minimize VOUT deviation during load transients.
