LD1117AG-ADJ-A-Q

Updated: 2026-07-18

Overview

The LD1117AG-ADJ-A-Q is a versatile low-dropout voltage regulator widely used in electronic devices. It is designed to provide a stable and adjustable output voltage, making it suitable for a variety of applications, from consumer electronics to industrial systems. The regulator is known for its efficiency, reliability, and compact form factor. This component is particularly favored for its ability to maintain a stable output voltage even when the input voltage is close to the output voltage, a feature known as low dropout. This makes it ideal for battery-powered devices and other applications where power efficiency is critical.

Structure and Working Principle

The LD1117AG-ADJ-A-Q consists of a reference voltage source, error amplifier, and pass transistor. The reference voltage source ensures a stable baseline, while the error amplifier compares the output voltage to the reference and adjusts the pass transistor accordingly. This feedback loop maintains the desired output voltage. The adjustable version of the LD1117 allows users to set the output voltage using external resistors. This flexibility makes it suitable for a wide range of applications. The regulator also includes built-in protection features such as thermal shutdown and current limiting to prevent damage under adverse conditions.

Key Features

One of the standout features of the LD1117AG-ADJ-A-Q is its low dropout voltage, typically around 1.1V at full load. This means it can regulate the output voltage even when the input voltage is only slightly higher than the output, enhancing energy efficiency. Other key features include a high output current capability of up to 800mA, excellent line and load regulation, and low quiescent current. These attributes make it a reliable choice for power-sensitive applications. The thermal shutdown and current limit protections further enhance its durability and safety.

Application Areas

The LD1117AG-ADJ-A-Q is commonly used in power management circuits for devices such as smartphones, tablets, and portable electronics. Its adjustable output makes it suitable for custom voltage requirements in various industrial and consumer applications. In addition to portable devices, this regulator is also found in automotive electronics, medical devices, and communication equipment. Its ability to provide stable voltage under varying load conditions makes it a preferred choice for systems requiring consistent power delivery.

Maintenance and Precautions

To ensure optimal performance, the LD1117AG-ADJ-A-Q should be operated within its specified voltage and current limits. Overloading the regulator or exposing it to excessive heat can lead to premature failure. Proper heat sinking is recommended for high-current applications. When designing circuits with this regulator, attention should be paid to the input and output capacitors. Using the recommended capacitor values helps maintain stability and prevents oscillations. Regular inspection and testing can help identify potential issues before they affect performance.

B2B Procurement Guide

When procuring the LD1117AG-ADJ-A-Q in bulk, it is important to verify the supplier's credentials and product authenticity. Reputable distributors often provide datasheets and compliance certificates to ensure the components meet industry standards. Price negotiations and lead times should be discussed upfront, especially for large orders. It is also advisable to request samples for testing before committing to a large purchase. Comparing quotes from multiple suppliers can help secure the best deal without compromising on quality.