CAT4201 是一款高效降压转换器，专为驱动大电流 LED 而优化。专利开关控制算法可实现高效、精确的 LED 电流调节。单个 RSET 电阻器可将高达 36V 的电源电压下的满量程 LED 灯串电流设置为高达 350mA。CAT4201 的开关架构可实现极低的内部功耗，从而使该器件能够采用微型封装，而无需专用散热器。该器件兼容高达 1MHz 的开关频率，非常适合需要小尺寸和低值外部电感器的应用。模拟调光和 LED 关断控制通过单个输入引脚 CTRL 提供。其他功能包括过载电流保护和热关断。该器件采用薄型 5 引线薄型 SOT23 封装，非常适合空间受限的应用。

The CAT4201 is a high efficiency step-down converter optimized to drive high current LEDs. A patented switching control algorithm allows highly efficient and accurate LED current regulation. A single RSET resistor sets the full scale LED string current up to 350mA from supplies as high as 36V. The switching architecture of the CAT4201 results in extremely low internal power dissipation allowing the device to be housed in a tiny package without the need for dedicated heat sinking. The device is compatible with switching frequencies of up to 1MHz, making it ideal for applications requiring small footprint and low value external inductors. Analog dimming and LED shutdown control is provided via a single input pin, CTRL. Additional features include overload current protection and thermal shutdown. The device is available in the low profile 5-lead thin SOT23 package and is ideal for space constrained applications.