XR3081

XR3081 _______________________________________________________________________________________________________ 1.2MHz, High-Efficiency, Step-Up Converter for 5 to 6 White LEDs General Description The XR3081 is a current-mode and fixed frequency boost converter with an integrated N-FET to drive up to 5~6 white LEDs in series. The series connection allows the LED current to be identical for uniform brightness. Its low on resistance of N- FET and feedback voltage reduce power loss and achieve high efficiency. Fast 1.2MHz current-mode PWM operation is available for input and output capacitors and a small inductor while minimizing ripple on the input supply. The OVP pin monitors the output voltage and stops switching if exceeds the over-voltage threshold. An internal soft-start circuit eliminates the inrush current during startup. It can driver 3(series)*12(parallel) LEDs. The XR3081 also integrates under- voltage lockout, over-temperature protection, and current limit circuits. The X...