DC/DC boost converter for driving white LEDs now available from Micrel

February 27, 2001–San Jose, California–A super-high efficiency DC/DC boost converter for driving white LEDs and biasing Notebook PC LCD panels is now available from Micrel Semiconductor, an industry leader in analog and power management ICs.

Leading edge cell phones and PDAs are using white LEDs as the solution of choice for backlighting color LCDs. With an integrated 1.5A switch, the MIC2145 can easily drive four white LEDs for cellular applications, or as many as 10 white LEDs for larger panel PDA applications. A peak-current-set feature allows designers to program the peak switch current to the level, which allows maximum efficiency. This feature allows the MIC2145 to be highly efficient in a wide range of applications and load currents.

In Notebook PC applications, the MIC2145 efficiently boosts the readily available 3.3V or 5V supply to provide the required LCD bias for TFT displays. A soft-start feature reduces power supply noise associated with in-rush current. Separate analog and power grounds further minimize noise.

“The MIC2145’s high efficiency and high level of integration makes it ideal for portable applications where battery life and board space are at a premium,” says Tony Grizelj, Micrel’s marketing manager for power products.

The MIC2145 can also be configured for use in boost, SEPIC, and flyback applications.

The MIC2145BMM is available in an MSOP-8 package, and priced at $2.30 when purchased in 1,000-piece quantities.


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