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LD1117AV18 1.8V Low-Dropout Voltage Regulator

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Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

LD1117AV18 1.8V Low-Dropout Voltage Regulator

Overview

The LD1117AV18 is a low-dropout (LDO) positive voltage regulator from STMicroelectronics that provides a fixed +1.8V output. It features very low dropout voltage and is ideal for battery-powered applications and modern digital circuits requiring 1.8V supplies.

Key Specifications

  • Output Voltage: +1.8V ±1%
  • Input Voltage Range: 2.5V to 15V
  • Maximum Output Current: 800mA
  • Package: TO-220 (3-pin)
  • Dropout Voltage: 1.2V @ 800mA
  • Operating Temperature: 0°C to 125°C
  • Line Regulation: 0.2% typical
  • Load Regulation: 0.4% typical

Pinout (TO-220)

   ┌─────┐
   │  1  │ Ground (Common)
   │  2  │ Output (+1.8V)
   │  3  │ Input (+Vin)
   └─────┘

Note: Pinout differs from LM78xx series - Ground and Output are swapped!

Applications

  • 1.8V core voltage for microprocessors
  • FPGA and DSP core power supplies
  • Modern microcontroller I/O voltage
  • Battery-powered devices
  • Low-voltage digital circuits
  • DDR memory voltage rails

Features

  • Very low dropout voltage (1.2V max)
  • High accuracy output (±1%)
  • Internal current limiting
  • Thermal overload protection
  • Fast transient response
  • Low quiescent current

Usage Notes

  • Critical: Pinout is different from LM78xx regulators!
  • Requires 10µF tantalum capacitor on output for stability
  • Input capacitor (0.33µF) recommended
  • Excellent for 3.3V to 1.8V conversion
  • Can be powered from 3V battery with good regulation

Typical Application Circuit

Vin ──┤0.33µF├── Pin 3 (Input)
                    │
                Pin 1 (Ground) ── GND
                    │
                Pin 2 (Output) ──┤10µF├── 1.8V Out
                                    │
                                   GND

Inventory

  • Quantity: 12 units
  • Location: Cabinet 3, Bin 23
  • Condition: New
  • Source: Digikey

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