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The CAT4201 allows an external RSET control resistor to regulate LED currents up to 350mA at up to 24V supply, providing better control of the inductor and no special thermal design. It uses a patent-pending new switch control algorithm that easily controls the average LED current with only one external resistor. This greatly reduces the internal power dissipation of the CAT4201, allowing it to be packaged in a 5-pin TSOT23 package without the need for a dedicated heat sink.
CAT4201 product features
Driven LED current up to 350mA
Compatible with 12V and 24V power supply systems
Safe handling of 40V transient voltage
Single pin enable and dimming control
Power conversion efficiency up to 94%
Drive up to 7 LEDs in series (24V system)
TSOT-23 5-lead package
Supply and price
When the order quantity is 10,000, the CAT4201 buck converter is priced at $0.72. Samples are available now. The delivery time of the production is expected to be 6-8 weeks after receiving the order.
The TSOT-23 5 is suitable for automotive instrumentation and lighting, including steering signals, x-car systems and map reading lighting. 
Even in extreme weather conditions, the all metal extruded aluminum alloy enclosure with cast aluminium top and bottom plates are fully dust and weatherproof
Topic: Catalyst Semiconductor, Inc., a provider of technology-based analog, mixed-signal devices and non-volatile memory, has announced the innovative buck converter for its SOT-23 package. Suitable for driving LEDs with high brightness and output current up to 350mA, the conversion efficiency is up to 94%.