6W LED driver integrates DC-DC Boost Converter for large LCDs

Maximising efficiency is the name of the game when backlighting large LCD panel applications. On Semiconductor's CAT4106 is a 4-channel LED driver that integrates a high power DC/DC converter and on-chip diagnostics that will optimise efficiency.

The 6W device is the company's first multi-channel boost device, and can drive up to 40 white LEDs, or four strings of 10 LEDs with up to 36V per string. In-built diagnostics automatically adjust the output voltage to drive the highest forward voltage (Vf) string with the minimum head room voltage. This circuitry also allows designers to set minimum and maximum voltage limits for LED strings using the external programming resistors. Any channel which does not regulate within the set range of Open Circuit or Short Circuit LED will be detected and flagged on the FAULT logic output.

The CAT4106 features low dropout LED channels of 500mV at 175mA and a high-frequency pulse width modulation interface, which supports multiple frequencies up to 2kHz. ,On Semiconductor claims the feature provides precise, high-resolution dimming control while the device remains fully biased.

This LED driver comes in a 4 x 4mm 16-lead TQFN package and a 16-lead TSSOP package with an exposed thermal pad for enhanced power dissipation.

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