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AN11470
Leadless Schottky diodes in a DC-to-DC step-up converter
Rev. 1 — 22 April 2014 Application note
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Keywords Schottky diode, boost converter, LED backlight, current source
Abstract This application note discusses the application of DC-to-DC voltage up
conversion with focus on the Schottky diode used in the backlight unit of
typical mobile devices. Products equipped with a Liquid Crystal Display
(LCD) such as smartphones, tablet PCs or notebooks need backlight for
the illumination. Strings of LEDs are the standard solution for an energy
efficient light generation. The LED strings need to be supplied with a
defined current. The voltage required for the strings is a multiple of the
forward voltage of the LEDs used. The main supply voltage of mobile
devices, e.g. from a lithium-ion battery pack, is not high enough to run a
current through the LED string. Therefore a voltage booster is required.
Requirements for the Schottky diode in this booster with respect to
electrical and thermal performance are discussed in detail. NXP
Semiconductors Schottky diodes allow to replace diodes in comparably
large packages with very small components and enable a further step
towards miniaturization without compromising performance.
