AMS1117 5V Low Voltage Dropout Regulator

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The AMS1117 is a popular SMD package 3-pin voltage regulator that is available in many models for fixed and adjustable voltage requirements. The IC can deliver a maximum current of 1 A and the output voltage can vary from 1.5 V to 5 V. It also has a low dropout voltage of 1.3 V when operating at maximum current.

Pin Configuration

 ADJ/GND (Pin 1)

This pin adjusts the output voltage if it is a fixed voltage regulator, it acts as a ground

Vout (Pin 2)

The regulated output voltage set by the adjusted pin can be obtained, from this pin

Vin (Pin 3)

The input voltage which has to be regulated is given to this pin


  • It has a low dropout voltage
  • Its load regulation is 0.2% typical
  • It is optimized for low voltage
  • It has on-chip thermal limiting
  • It has a built-in thermal shutdown
  • It has good noise rejection
  • It has three-terminal adjustable or fixed low dropout


  • Used for Positive voltage regulations
  • Variable power supply
  • Current limiting circuits
  • Reverse polarity circuits
  • Commonly used in Desktop PC, DVD and other consumer products
  • Used in motor control circuits
  • High-Efficiency Linear Regulators
  • Post Regulators for Switching Supplies
  • Battery ChargersActive SCSI Terminators
  • Power Management for NotebookBattery
  • Powered Instrumentation
Package  SOT-223
Output Voltage 5 V
Max Output Current 1 A
Load Regulation 0.4% (Maximum)
Maximum Drop-out Voltage 1.3 V
Operating junction temperature 125 °C
Country of Origin China

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