LTC3490 white LED driver circuit diagram

Published:2011/9/6 4:33:00 Author:Lucas | Keyword: white LED driver | From:SeekIC

LTC3490 is a synchronous current-mode step-up converter with fixed frequency. In the two-cell application circuit, LTC3490's efficiency is up to 90%; in the application of single cell circuit, LTC3490's efficiency is higher than 70%. The Figure shows the LTC3490's two-battery circuit and single-cell circuit. In the circuit, when the output voltage is higher than 4.5V, the over-voltage detector will force the LTC3490 into shutdown mode, and over-voltage detector remains connection state, when the output voltage is down below to 4.5V, it starts the normal work.



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