LTC3210-1

LTC3210-1 MAIN/CAM LED Controller with 64-Step Brightness Control in 3mm × 3mm QFN Features Description n Low Noise Charge Pump Provides High Efficiency with Automatic Mode Switching n Multimode Operation: 1x, 1.5x, 2x n Individual Full-Scale Current Set Resistors n Up to 500mA Total Output Current n Single Wire EN/Brightness Control for MAIN and CAM LEDs n 64:1 Linear Brightness Control Range for MAIN Display n Four 25mA Low Dropout MAIN LED Outputs n One 400mA Low Dropout CAM LED Output n Low Noise Constant-Frequency Operation n Low Shutdown Current: 3µA n Internal Soft-Start Limits Inrush Current During Startup and Mode Switching n Open/Short LED Protection n No Inductors n 3mm × 3mm × 0.75mm 16-Lead Plastic QFN Package Applications n Multi-LED Light Supply for Cell Phones/DSCs/PDAs L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LTC®3210-1 is a low noise charge pump DC/DC converter designed to drive four MAIN LEDs and one high current CAM LED for camera lighting. The LTC3210-1 requires only four small ceramic capacitors and two current set resistors to form a complete LED power supply and current controller. Built-in soft-start circuitry prevents excessive inrush current during start-up and mode changes. High switching frequency enables the use of small external capacitors. Independent MAIN and CAM full-sc...