AMS1117-3.3V 800mA LDO Voltage Regulator Module – 5V to 3.3V Step-Down Power Supply Board

Description

Description

The AMS1117-3.3V LDO Voltage Regulator Module is a compact, high-performance linear voltage regulator board designed to provide a stable and clean 3.3V DC output from a higher voltage DC input. Built around the renowned AMS1117-3.3 low-dropout regulator (LDO), this module is an essential building block for countless electronics projects, microcontroller applications, and prototype development requiring a reliable 3.3V power source.

The AMS1117 series is a popular family of low-dropout linear regulators known for their simplicity, reliability, and excellent performance. This fixed 3.3V version accepts a wide input voltage range (typically 4.5V to 15V DC) and steps it down to a precise 3.3V output with a maximum current of up to 800mA to 1A (depending on cooling and input voltage conditions) . The module features a very low dropout voltage—the minimum difference required between the input and output for proper operation—of approximately 1.1V to 1.3V at full load . This allows you to power your 3.3V circuits from common 5V USB supplies, 9V batteries, or 12V wall adapters.

The onboard AMS1117-3.3 integrates essential protection features, including over-current protection (current limiting) and thermal shutdown, safeguarding your downstream circuitry and the regulator itself from damage during fault conditions . The regulator’s output voltage is trimmed for high accuracy, typically within ±1% to ±1.5% of the ideal 3.3V .

This module simplifies the use of the AMS1117 by breaking out the three essential pins (Input, Ground, Output) to easy-to-use pin headers or screw terminal blocks. A power indicator LED is included to visually confirm that the output is active . Many variants also feature mounting holes, allowing for secure attachment within your project enclosure.

The board is typically designed with a very simple and straightforward layout, requiring only input and output filtering capacitors (often included on the module) for stable operation. This makes it an ideal “plug-and-play” solution for developers who need a reliable 3.3V rail without designing a custom power supply circuit.

Whether you need to power a 3.3V microcontroller (like ESP8266, ESP32, or STM32), a sensor module, a wireless communication chip, or simply create a dedicated 3.3V test point on your workbench, the AMS1117-3.3V LDO Voltage Regulator Module provides a simple, effective, and reliable solution for all your voltage regulation needs.

Key Features

• Fixed 3.3V Output – Provides a stable, regulated 3.3V DC output perfect for modern microcontrollers and 3.3V logic circuits

• Wide Input Voltage Range – Accepts DC inputs from 4.5V to 15V, making it compatible with 5V USB, 9V batteries, and 12V adapters

• 800mA Output Current – Capable of delivering up to 800mA of continuous output current (1A peak, derate based on cooling)

• Low Dropout Voltage – Requires only a 1.1V to 1.3V difference between input and output to maintain regulation, allowing efficient operation from 5V inputs

• Integrated Protection – Features built-in over-current limiting and thermal shutdown protection for reliable, fail-safe operation

• High Ripple Rejection – 75dB PSRR at 10kHz provides excellent power supply ripple rejection for noise-sensitive applications

• Low Quiescent Current – Consumes a very low operating current (5-10mA), making it suitable for power-sensitive applications

• Easy to Use – Simple 3-pin interface (Input, Ground, Output) on pin headers or screw terminals for quick, solderless wiring

• Visual Indicator – Onboard power LED provides instant visual confirmation that the module is powered and the output is active

• Compact Form Factor – Small footprint (approximately 13mm x 9mm), ideal for space-constrained projects and breadboard integration

Technical Parameters