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A Study on the Characteristics of the Vertical PNP transistor that improves the starting current
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 Title & Authors
A Study on the Characteristics of the Vertical PNP transistor that improves the starting current
Lee, Jung-Hwan;
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In this paper, we introduce the characteristics of a vertical PNP transistor that improves start current by decreasing quiescent current with suppressing the parasitic transistor. In order to suppress the parasitic effect, we designed a vertical PNP transistor which suppresses parasitic PNP transistor by using the "DN+ links" without changing the circuit and made a LDO regulator using a standard IC processor. HFE of the fabricated parasitic PNP transistor decreased from conventional 18 to 0.9. Starting current of the LDO regulator made of the vertical PNP transistor using the improved "DN+ linked" structure is reduced from the conventional starting current of 90mA to 32mA. As the result, we developed a LDO regulator which consumes lower power in the standby state.
parasitic PNP transistor;vertical PNP transistor;quiescent current;start current;
 Cited by
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