Tiny regulators drive white LED backlights
Dave Kim
Abstract
Several different circuits that may be used to boost and regulate the Li-Ion battery voltage to power white LEDs and are small enough to easily fit within cellular telephones and handheld computers are described.
Keywords
LED backlight
step-up regulator
LTC1754-5
LTC1682
LT1615
Introduction
The emergence of color LCD displays in handheld information appliances has created the need for a small, bright white backlight. Fortunately, the recent commercialization of high intensity white LEDs provides the perfect solution. These tiny LEDs are capable of delivering ample white light without the fragility problems and costs associated with fluorescent backlights commonly ...
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