MX1576 Charge-pump Drving White LED Circuit

Published:2011/6/23 23:05:00 Author:Michel | Keyword: Charge-pump, Drving, White LED Circuit | From:SeekIC

MAX1516 charge-pump can drive up to 8 white LED and it has constant current adjustment function, in order to achieve unified light intensity. The MAX1516 charge-pump can drive every group LED with 30mA which is used in blacklight.Flash group LED (LED5 ~ LED8) is the solely controlled, and they are able to use 100 mA current drive each LED ( 400 mA in total) .Through the use of adaptive 1 x, 1.5 x, 2 x mode charge-pump and current regulator of ultra low voltage difference, MAX1576 can achieve high efficiency in a lithiumion battery voltage range.Because fixed switching frequency is 1 MHz, low EMI and low input ripple. can be ensured by only using very little external components and regulation scheme optimization.



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