High-Efficiency 7W Buck LED Driver in TSOT-23

Catalyst Semiconductor has introduced the CAT4201 — a high-efficiency 7W buck LED driver optimized for driving high-brightness, 350mA LEDs at up 94% efficiency, in a 5-lead TSOT-23 package.

The CAT4201 incorporates Catalyst’s patent-pending switching control algorithm. This new architecture reduces system complexity, improves efficiency and allows an external RSET control resistor to preset a regulated LED current up to 350mA from supplies as high as 24 volts, to provide better inductor control and eliminate the need for a dedicated heat sink. The CAT4201 offers a more efficient and significantly smaller alternative to linear regulators for driving high-brightness LEDs in step-down applications, eliminating the need for heatsinks. Additionally, built-in load dump protection allows transients of 40 volts to be safely handled, fully optimizing the CAT4201 for automotive indicator and illumination lighting applications, including turn signal, brake and map reading lights.

Features		Applications
• LED currents up to 350mA		• General lighting
• Single Pin Control and Dimming functions		• Transportation lighting
• Power efficiency up to 94%		• Signage
• Drives up to 7 LEDs in series (24V systems)
• TSOT-23 5-lead package