Catalyst Semiconductor's 1A LDD Targeted at High-power LED Lighting Applications

(Product News, 27 Aug 2008)

Catalyst Semiconductor Inc. has expanded its line of constant-current, LDD (low dropout driver) products to include a new, simple-to-use, high-power device for architectural, landscape, automotive and general LED lighting products. The CAT4101 is a linear-based, constant-current LED driver, which drives long strings of LEDs and provides a high-current solution for a wide range LED applications.

Since it is a linear-based LED driver, the CAT4101 does not require an inductor, eliminating noise, minimizing component count and simplifying design. The LED current is set via an external resistor connected to the RSET pin. The LED pin is compatible with high-voltages up to 25V. This enables the CAT4101 to drive long strings of up to 10 LEDs, adjustable to 1A. The device offers high-speed, high-resolution PWM dimming, an "instant-on" PWM control mode and thermal shutdown protection in the event of an over-temperature fault condition. The CAT4101 is available in a five-lead, TO-263 package to provide exceptional thermal dissipation.

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