Step-up dc/dc converter integrates output current cut-off function

Geneva, Switzerland —STMicroelectronics has introduced a step-up dc/dc converter that the company said is the first on the market to integrate an output current cut-off function, which reduces the number of external components required. The ST8R00 is well-suited for blue laser applications, targeted at portable and consumer products such as Blu-ray Disc players/recorders, laptops, and game consoles.

In portable applications, the step-up converter accepts the typical 5-V input voltage and converts it to a higher output voltage to supply blue lasers from 6.5 to 11 V, depending on the laser model and whether it is operating in reading or writing mode. When the device is switched off, even a small current flowing through the laser can damage it, or the whole application, STMicro said.

As a result, designers typically add external components to block current flow in the device. Unlike previous solutions that add an external current cut-off block, the fully integrated ST8R00 includes this feature on a single chip.

Other key features include a typical efficiency of 90%, a wide range of output voltages (adjustable from 6 V to 12 V), an output current up to 1 A, and a high switching frequency, enabling the device to operate with small and low-cost inductors.

Pricing: The ST8R00, housed in a DFN4x4-8L package, is priced at $0.60.
Product information: power management ICs
Datasheet: ST8R00

STMicroelectronics , 1-781-861-2650,

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