Mixed Signal/Analog
Catalyst Announces High-Efficiency 7W Buck LED Driver in TSOT-23 Package
Catalyst Semiconductor, Inc. (NASDAQ:CATS) a supplier of analog, mixed-signal and non-volatile memory semiconductors, today announced its innovative buck converter in a TSOT-23 package optimized for driving high-brightness, 350mA LEDs at up 94 percent efficiency. The first device in a new family of buck converters, 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 Traditionally, LEDs from 12V or 24V buses have been driven by linear regulators, which generate a significant amount of heat, resulting in the need for a dedicated heat sink and, therefore, a very large TO263 package. The patent-pending switching architecture of the CAT4201 lets designers easily control the average current with a single external resistor. This results in extremely low internal power dissipation allowing the CAT4201 to be housed in a tiny, 5-lead TSOT-23 package without the need for a dedicated heat sink. Additionally, the device is compatible with switching frequencies up to 1MHz, making it ideal for applications requiring small-footprint, low-cost external inductors.
Customer Application: EZM Lighting
EZM Lighting, a leading manufacturer of safety lighting for traffic environments has designed the CAT4201 into its latest tunnel lighting products. According to Fabiano Paoletto, R&D Manager for EZM Lighting, “Until now, linear regulators provided an adequate solution for our existing, medium-power lighting products. However, as we expanded our product line to include the latest high-power LEDs, driver efficiency and package thermal dissipation issues became critical. The CAT4201 provides a simple yet effective solution, allowing our products to double their lighting power capability without the need for dedicated heatsinking.”
The CAT4201 can drive one 1W LED from a 6V supply or up to 7 LEDs in series from a 24V supply. A dedicated enable control using minimal input current allows the load to be disabled and placed into a zero current shutdown mode, eliminating battery drain when not in use. Protection against short-circuit and thermal overload fault conditions is also included.
CAT4201 Product Features
- LED currents up to 350mA
- 12V and 24V system compatible
- Handles transients up to 40V
- Single Pin Control and Dimming functions
- Power efficiency up to 94 percent
- Drives up to 7 LEDs in series (24V systems)
- TSOT-23 5-lead package
Price and Availability
The CAT4201 buck converter is priced at $0.72 each in 10,000 piece quantities. Samples are available now. Projected lead-time for production quantities is currently 6 to 8 weeks ARO.