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AN11470 Datasheet(PDF) 1 Page - NXP Semiconductors

Part #	AN11470

Description	Leadless Schottky diodes in a DC-to-DC step-up converter

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Manufacturer	NXP [NXP Semiconductors]

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AN11470

Leadless Schottky diodes in a DC-to-DC step-up converter

Rev. 1 — 22 April 2014

Application note

Document information

Info

Content

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.

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Manufacturer	Part #	Datasheet	Description
Unisonic Technologies	UC8383	444Kb / 9P	STEP-UP DC/DC CONVERTER
Diodes Incorporated	AP1603	159Kb / 8P	STEP-UP DC/DC CONVERTER AP1603 Rev. 1
Anachip Corp	AP1602	164Kb / 7P	Step-Up DC/DC Converter
Anachip Corp	AP1522	166Kb / 8P	Step-Up DC/DC Converter
Micon Design Technology...	MDT7727	107Kb / 4P	Step-up DC/DC Converter
SiGe Semiconductor, Inc...	AATIAN36	231Kb / 7P	Step-Up DC/DC Converter
Diodes Incorporated	AP1603	278Kb / 8P	STEP-UP DC-DC CONVERTER Rev. 4 - 2 February 2014
Diodes Incorporated	AP1522	323Kb / 10P	STEP-UP DC/DC CONVERTER December 2017 Rev. 4 - 4
Micon Design Technology...	MDT7733	63Kb / 3P	Step-up DC/DC Converter
Kingbor Technology Co	KB2301	137Kb / 10P	Step-Up DC-DC Converter

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