Today’s ultrabright LEDs far exceed the performance of incandescent bulbs in both efficiency and lifetime. Taking full advantage of these features requires a correspondingly efficient and reliable LED driver, such as the LT3474. The LT3474 is a step-down 1A LED driver that supports a variety of power sources, has a wide 4V to 36V input voltage range and is programmable to deliver LED current from 35mA to 1A at up to 88% efficiency. It requires minimal external circuitry and is available in a space saving 16-lead TSSOP package.