LD1117STR
Adjustable low dropout voltage regulators for precise power management
Manufacturer： stm
series introduction
# LD1117STR Product Series Introduction
## 1. Overview
The LD1117STR product series is a line of low - dropout (LDO) voltage regulators renowned for their high performance, reliability, and versatility. These regulators are designed to provide a stable and precise output voltage, making them an ideal choice for a wide range of electronic applications where a consistent power supply is crucial.
## 2. Key Features
### 2.1 Low Dropout Voltage
One of the most significant features of the LD1117STR series is its low dropout voltage. Dropout voltage refers to the minimum input - output voltage difference required for the regulator to maintain a stable output. With a low dropout voltage, these regulators can operate efficiently even when the input voltage is only slightly higher than the desired output voltage. This is particularly useful in battery - powered applications, as it allows the battery to be used more effectively until its voltage drops to a lower level, thus extending the battery life.
### 2.2 High Output Voltage Accuracy
The LD1117STR regulators offer high output voltage accuracy. They can maintain the output voltage within a tight tolerance, typically within ±1% or better. This high accuracy ensures that the connected electronic components receive a stable and precise power supply, which is essential for the proper functioning of sensitive circuits such as microcontrollers, sensors, and communication modules.
### 2.3 Adjustable and Fixed Output Voltage Options
The series comes in both adjustable and fixed output voltage versions. The fixed - output models are available with common output voltages such as 1.8V, 2.5V, 3.3V, and 5V, which are widely used in various electronic systems. The adjustable version allows users to set the output voltage within a certain range according to their specific requirements, providing greater flexibility in circuit design.
### 2.4 Low Quiescent Current
Quiescent current is the current consumed by the regulator when there is no load or a very light load. The LD1117STR series has a low quiescent current, which means it consumes very little power during standby or low - load conditions. This feature is beneficial for battery - powered devices, as it helps to reduce overall power consumption and increase the battery's runtime.
### 2.5 Thermal Over - Protection and Short - Circuit Protection
To ensure the safety and reliability of the regulator and the connected circuits, the LD1117STR series is equipped with thermal over - protection and short - circuit protection mechanisms. Thermal over - protection automatically shuts down the regulator when the temperature exceeds a certain threshold, preventing damage due to overheating. Short - circuit protection safeguards the regulator from damage in case of a short - circuit in the output circuit by limiting the current flow.
## 3. Applications
### 3.1 Mobile Devices
In mobile phones, tablets, and portable media players, the LD1117STR regulators are used to provide stable power to various components such as the processor, memory, display, and wireless communication modules. Their low dropout voltage and low quiescent current make them suitable for extending the battery life of these devices.
### 3.2 Industrial Control Systems
Industrial control systems often require a stable power supply for sensors, actuators, and microcontrollers. The high output voltage accuracy and protection features of the LD1117STR series make it a reliable choice for these applications, ensuring the proper operation of the control system even in harsh industrial environments.
### 3.3 Automotive Electronics
In automotive electronics, the LD1117STR regulators can be used to power various on - board systems such as infotainment systems, engine control units, and sensor modules. Their ability to operate over a wide temperature range and withstand electrical noise makes them suitable for automotive applications.
### 3.4 Consumer Electronics
Images for reference
SOT223-3L
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