Micrel MIC2870/1 LED Drivers
Micrel MIC2870/1 is an ideal solution for high-resolution camera phone LED flashlight driver applications. The LED driver current is generated by an integrated inductive boost converter with 2MHz switching frequency which allows the use of very small inductors and output capacitors. MIC2870 supports two 750mA white-LEDs (WLEDs) or a single 1.5A WLED configuration. When two WLEDs are connected, their currents are matched automatically. The MIC2870 operates in either flash or torch modes that can be controlled through either an I2C interface or external pins. The brightness in the flash and torch mode can be adjusted via two external resistors individually. The high-speed I2C interface provides a simple control at a clock speed up to 3.4MHz to support most camera functions such as auto-focus, white balance, and image capture (flash mode). MIC2871 operates in either flash or torch modes that can be controlled through the single wire serial interface and/or external control pins. Default flash and torch brightness can be adjusted via an external resistor. A single wire serial interface allows the host processor to support typical camera functions such as auto-focus, white balance, and image capture (flash mode).