Catalyst Semiconductor Inc. has introduced the CAT4240, an LED driver for high-power backlighting applications. The boost converter produces switch current of up to 750 mA and voltage of up to 38 V, making it suitable for driving 1-W LEDs in series as well as multiple strings of lower-power ones. The device produces 2 W of output from a 3- to 5-V supply and up to 6 W when configured with a split supply of 9 to 12 V. The 1-MHz switching architecture enables use in low-noise applications. A high-voltage CMOS output stage allows large LED strings to be accurately biased and regulated from a low-voltage input supply while producing efficiency of up to 87%.

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