Datasheet Ams1117

5 min read Jun 26, 2024
Datasheet Ams1117

AMS1117 Datasheet: A Comprehensive Review


The AMS1117 is a popular low dropout linear voltage regulator (LDO) from Advanced Monolithic Systems (AMS) that provides a high-performance solution for powering digital circuits. With its ability to regulate output voltage from 1.5V to 5V, the AMS1117 is widely used in a variety of applications, including USB devices, battery-powered devices, and post-regulation for switching power supplies.

Key Features

Low Dropout Voltage

The AMS1117 features a low dropout voltage of 1.3V, making it suitable for applications where the input voltage is close to the output voltage.

High Accuracy

The device offers a high accuracy of ±2% over the entire operating temperature range, ensuring that the output voltage remains stable and consistent.

Low Quiescent Current

The AMS1117 has a low quiescent current of 5mA, making it suitable for battery-powered devices where power consumption is a critical factor.

Short-Circuit Protection

The device features built-in short-circuit protection, which prevents damage to the device in the event of an output short circuit.

Thermal Overload Protection

The AMS1117 also features thermal overload protection, which shuts down the device in the event of an overtemperature condition.

Datasheet Overview

The datasheet for the AMS1117 provides a comprehensive overview of the device's characteristics, including:

Absolute Maximum Ratings

The absolute maximum ratings section outlines the maximum operating conditions for the device, including input voltage, output voltage, and operating temperature.

Electrical Characteristics

The electrical characteristics section provides detailed information on the device's performance, including output voltage, output current, and dropout voltage.

Typical Performance Characteristics

The typical performance characteristics section provides graphs and tables that illustrate the device's performance under various operating conditions.

Application Information

The application information section provides guidance on using the AMS1117 in specific applications, including circuit design guidelines and layout considerations.

Package Dimensions

The package dimensions section provides detailed information on the device's physical dimensions, including package type, pinout, and layout.

Pin Configuration

The AMS1117 is available in a 3-pin TO-220 package, with the following pin configuration:

Pin Description
1 Input Voltage
2 Output Voltage
3 Ground


The AMS1117 is suitable for a wide range of applications, including:

USB Devices

The AMS1117 is commonly used to power USB devices, including hubs, peripherals, and interfaces.

Battery-Powered Devices

The device's low quiescent current and low dropout voltage make it suitable for battery-powered devices, including mobile phones, laptops, and tablets.

Post-Regulation for Switching Power Supplies

The AMS1117 can be used as a post-regulator for switching power supplies, providing a stable output voltage and reducing ripple and noise.


The AMS1117 is a reliable and efficient linear voltage regulator that provides a high-performance solution for powering digital circuits. Its low dropout voltage, high accuracy, and low quiescent current make it suitable for a wide range of applications. By understanding the device's characteristics and features, designers can select the AMS1117 with confidence and design reliable and efficient power supplies.

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