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Using a vertical PNP transistor in a low dropout voltage regulator to enhance power supply performance

  • 2013-09-19
  • 154.55KB
  • Points it Requires : 2

           Standard three-terminal voltage regulator ICs useanNPN transistor as the series pass element,so theinput-output voltage drop is 1.5V-2V. Low dropoutregulators using lateral PNP pass transistors havebeen available for several years, but a lateral PNPtransistorhaslow gain,sothe basecurrent is necessarilyhigh, and a low fT, so the settling time is poor.Moreover, for stability a large output capacitor isneeded.

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