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DC-DC Voltage Regulator Low Dropout 3.3V IC LM1117T

DC-DC Voltage Regulator Low Dropout 3.3V IC LM1117T

The LM1117 is a high-performance, low-dropout (LDO) voltage regulator designed for stable and efficient power management in electronic circuits. With a dropout voltage of just 1.2V at 800mA load current, it ensures consistent and reliable voltage regulation even under demanding conditions. Its pin configuration is compatible with the industry-standard LM317, allowing for easy integration and replacement in existing designs. The adjustable version of the LM1117 provides flexibility by allowing users to set the output voltage with two external resistors, making it suitable for a wide range of applications requiring precise voltage control.

Package Includes:

  • 1 x LM1117 Low Dropout Voltage Regulator (3.3V, SOT-223 Package)


LDO Regulator
4.00 AED 4.00 AED (Tax included)

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Features:

  • Low Dropout Voltage: 1.2V at 800mA load current
  • Adjustable and Fixed Voltage Versions: Easily set output voltage with two resistors
  • Output Voltage: 3.3V fixed version
  • Current Limiting and Thermal Protection for enhanced reliability
  • Pin-compatible with LM317 for easy replacement in circuits
  • Zener-trimmed bandgap reference for ±1% output voltage accuracy
  • Temperature Range: 0°C to 125°C
  • Line Regulation: 0.2% (Max)
  • Load Regulation: 0.4% (Max)
  • Package: Space-saving SOT-223

Principle of Work:

The LM1117 regulates voltage by using an internal series pass transistor in combination with a bandgap voltage reference. It adjusts the conduction through the pass transistor to maintain a stable output voltage regardless of variations in input voltage or load current. The internal feedback ensures high precision, while the current limit and thermal shutdown mechanisms protect the regulator and the connected circuit from damage under fault conditions.

Pinout / Connections:

LM1117 5.0V 0.8A Low-Dropout Regulator - Datasheet

The LM1117 comes in a standard SOT-223 package with three pins: Input (VIN), Ground (GND), and Output (VOUT). For the adjustable version, two external resistors are connected between the output and ground and the adjust pin to set the desired voltage.

Applications:

  1. Post-regulator for switching DC/DC converters
  2. High-efficiency linear voltage regulation
  3. Battery chargers and battery-powered instrumentation
  4. Embedded systems requiring low-noise, stable voltage
  5. Precision electronics where voltage accuracy is critical

Circuit:

A Comprehensive Guide to the LM1117 Voltage Regulator

The LM1117 can be connected with input voltage (VIN) ranging above 3.3V, the ground pin to GND, and output pin (VOUT) providing regulated 3.3V to your circuit. Optional capacitors at input and output improve stability and transient response.

 

Technical Details:

  • Output Voltage: 3.3V
  • Maximum Output Current: 800mA
  • Dropout Voltage: 1.2V at 800mA
  • Package: SOT-223
  • Line Regulation: 0.2% (Max)
  • Load Regulation: 0.4% (Max)
  • Temperature Range: 0°C to 125°C
  • Protection: Current limiting, thermal shutdown
  • Pinout: Input, Ground, Output (Adjust pin for variable version)
  • Voltage Accuracy: ±1%

Resources: