Diodes Incorporated
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AP133 (Not Recommended for new design)

NRND = Not Recommended for New Design

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The AP133 is a 300mA, adjustable output voltage, low dropout linear regulator. The device included pass element, error amplifier, band-gap, current limit and thermal shutdown circuitry. The device is turned on when EN pin is set to logic high level. The characteristics of low dropout voltage and less quiescent current make it good for low power applications, for example, battery powered devices. The typical quiescent current is approximately 40μA from zero to maximum load. Built-in current-limit and thermal-shutdown functions prevent IC from damage in fault conditions. The AP133 is available in SOT25 and DFN2020-6 packages.


  • 300mA Low Dropout Regulator with EN
  • Very low IQ: 40μA
  • Wide input voltage range: 2V – 6V
  • Adjustable output: 1V – 5V
  • High PSRR: 65dB at 1kHz
  • Ultra-fast start-up time: 25μs
  • Stable with low ESR, 1μF ceramic output capacitor
  • Excellent Load/Line Transient Response
  • Low dropout: 350mV at 300mA
  • Current limit protection
  • Short circuit protection
  • Thermal shutdown protection
  • Ambient temperature range: -40°C to 85°C
  • SOT25 and DFN2020-6: Available in “Green” Molding Compound (No Br, Sb)
  • Lead Free Finish/RoHS Compliant


  • Cellular Phones
  • Smart Phones, PDAs
  • MP3/MP4
  • Bluetooth head set
  • Low power application

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