Demonstration circuit 687A is a low input voltage and ultralow dropout voltage supply using the LT3020 linear regulator, which comes in a small 8-lead DFN package. The DC687A has an input voltage range from 1V to 10V, an output voltage range between 0.2V and 10V minus the dropout voltage, and is capable of delivering 100mA max. Due to the 0.2V reference of the LT3020, the DC687A is capable of supplying power to very low voltage applications, such as (relatively) high current voltage references. DC687A uses ceramic capacitors because of the LT3020's ability to maintain stability even with the low ESR of ceramic output capacitors.
The LT3020 data sheet gives a complete description of the part, operation and applications information. The data sheet must be read in conjunction with this demo manual for demonstration circuit DC687A. The LT3020 is assembled in an 8-lead MSOP and 3mm x 3mm DFN packages with an exposed pad on the bottom-side of the IC. Proper board layout is essential for maximum thermal performance.