ST8R00 Voltage Regulator
Highly integrated step-up DC-DC converter
for blue laser based applications

In portable applications a step-up converter accepts the typical 5V input voltage and converts it to a higher output voltage able to supply Blue Lasers at 9 or 11V, both in reading and writing mode respectively. When the device is switched off, even a small current flowing through the laser can damage it or even the whole application. To avoid malfunctioning in the application, designers usually need to add an external block able to stop any current in the device, thus wasting board area and increasing the overall application cost. Unlike previous solutions that add an external current cutoff block, the fully integrated ST8R00 includes this feature on a single chip. As a result, the number of external components is drastically reduced and costs are lowered.
Other key features of the ST8R00 include a typical efficiency of 90%, a wide range of output voltage - adjustable from 6V to 12V, an output current up to 1A, and a high switching frequency enabling the device to operate with small and low-cost inductors.

ST8R00 application schematic