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A low-dropout or LDO regulator is a DC linear voltage regulator which can regulate the output voltage even when the supply voltage is very close to the output voltage.〔 〕 The advantages of a low dropout voltage regulator over other DC to DC regulators include the absence of switching noise (as no switching takes place), smaller device size (as neither large inductors nor transformers are needed), and greater design simplicity (usually consists of a reference, an amplifier, and a pass element). A significant disadvantage is that, unlike switching regulators, linear DC regulators must dissipate power across the regulation device in order to regulate the output voltage.〔 〕 ==History== The adjustable low-dropout regulator debuted on April 12, 1977 in an ''Electronic Design'' article entitled "''Break Loose from Fixed IC Regulators''". The article was written by Robert Dobkin, an IC designer then working for National Semiconductor. Because of this, National Semiconductor claims the title of "''LDO inventor''".〔(LDOs, Low Dropout Regulators, Linear Regulators, CMOS Linear Regulator )〕 Dobkin later left National Semiconductor in 1981 and founded Linear Technology where he is currently chief technology officer.〔 (【引用サイトリンク】 Inventor Updates A Classic 30 Years Later )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Low-dropout regulator」の詳細全文を読む スポンサード リンク
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