摘要： MAX1759升降压电荷泵调节恒流功率白光LED ，巧妙地利用了反馈网络。 1X/2X模式电荷泵提供高效率，尤其是在两节镍氢和/或碱性的应用。Maxim > App Notes > Display Drivers Power-Supply Circuits Keywords: LEDs, white LEDs, charge pumps, charge-pump, current regulators, buck, boost, step up/down, Mar 27, 2002 step-up/down, buck/boost, backlight, two cell, AA, alkaline, NiMH APPLICATION NOTE 1021 Buck/Boost Charge-Pump Regulator Powers White LEDs from a Wide 1.6V to 5.5V Input Abstract: The MAX1759 step-up/step-down charge-pump regulator is used to power white LEDs with constant current by clever use of a feedback network. The 1x/2x modes of the charge pump provides high efficiency, especially in two-cell NiMH and/or Alkaline applications. Since their invention a few years ago, white light-emitting-diodes (LEDs) have been steadily gaining in popularity. Because they offer whiter light and longer life than incandescent……