LM1117MPX-3.3
3.3V fixed LDO voltage regulators with 800mA output in SOT-223 package
Manufacturer： ['national-semiconductor', 'chipswinner', 'ti']
series introduction
# LM1117MPX - 3.3: A Comprehensive Introduction
## 1. Overview
The LM1117MPX - 3.3 is a member of the LM1117 series of low - dropout (LDO) voltage regulators. These regulators are designed to provide a stable and precise output voltage, making them an essential component in a wide range of electronic circuits. The "3.3" in the part number indicates that this particular regulator is configured to output a fixed voltage of 3.3 volts, which is a commonly used voltage level in modern electronic systems, especially those based on microcontrollers, digital signal processors, and other integrated circuits.
## 2. Key Features
### 2.1 Low Dropout Voltage
One of the most significant features of the LM1117MPX - 3.3 is its low dropout voltage. Dropout voltage is the minimum difference between the input voltage and the output voltage required for the regulator to maintain a stable output. For the LM1117MPX - 3.3, the typical dropout voltage is around 1.2 volts at a load current of 800 mA. This low dropout characteristic allows the regulator to operate efficiently even when the input voltage is only slightly higher than the desired output voltage, which is crucial in battery - powered applications where conserving battery life is a priority.
### 2.2 High Output Voltage Accuracy
The LM1117MPX - 3.3 offers high output voltage accuracy. It can maintain the output voltage within a tight tolerance, typically ±1% over the full temperature range. This high accuracy ensures that the connected electronic components receive a stable and reliable power supply, which is essential for their proper operation. For example, in a microcontroller - based system, a stable 3.3 - volt supply is necessary to ensure accurate data processing and communication.
### 2.3 Adjustable and Fixed Output Options
While the LM1117MPX - 3.3 is a fixed - output regulator with a 3.3 - volt output, the LM1117 series also includes adjustable versions. This flexibility allows designers to choose the most suitable option for their specific application requirements. The fixed - output version simplifies the design process as it eliminates the need for external components to set the output voltage.
### 2.4 Thermal Overload and Short - Circuit Protection
The LM1117MPX - 3.3 is equipped with built - in thermal overload and short - circuit protection mechanisms. Thermal overload protection prevents the regulator from overheating by reducing the output current when the temperature exceeds a certain threshold. Short - circuit protection safeguards the regulator and the connected circuit from damage in case of a short - circuit condition by limiting the output current. These protection features enhance the reliability and durability of the regulator and the overall electronic system.
### 2.5 Low Quiescent Current
The quiescent current of the LM1117MPX - 3.3 is relatively low, typically around 5 mA. Quiescent current is the current consumed by the regulator when there is no load connected. A low quiescent current is beneficial in battery - powered applications as it helps to extend the battery life by reducing the standby power consumption.
## 3. Applications
### 3.1 Portable Electronic Devices
The LM1117MPX - 3.3 is widely used in portable electronic devices such as smartphones, tablets, and portable media players. These devices often rely on battery power, and the low dropout voltage and low quiescent current of the regulator help to maximize the battery life. The high output voltage accuracy ensures the stable operation of the internal components, such as the processor, memory, and display.
### 3.2 Embedded Systems
In embedded systems
Images for reference
SOT223-3L
Image Preview
Image Preview