LD1117S33TR is a low dropout voltage regulator designed by STMicroelectronics, a leading semiconductor manufacturer. This voltage regulator is part of the LD1117 series and is designed to provide a fixed output voltage of 3.3 volts with a maximum output current of 800 milliamps.
The LD1117S33TR voltage regulator is an efficient device that can operate with a low input-output voltage differential, which allows for a lower power dissipation compared to other voltage regulators. This makes it suitable for use in battery-powered devices where power efficiency is important.
| Product Type： | LDO Voltage Regulators | Input Voltage, Max： | 15 V |
| Output Voltage： | 3.3 V | Output Type： | Fixed |
| Unit Weight: | 260mg | Package/Case: | SOT-223-3 |
Low dropout voltage (1 V typical)
2.85 V Device performance for SCSI-2 active terminals
Output currents up to 800 mA
Fixed output voltages: 1.2 V, 1.8 V, 2.5 V, 3.3 V, 5.0 V
Adjustable version availability (VREF=1.25V)
Internal current and thermal limiting
Provides +1% (at 25°C) and 2% over the entire temperature range
Supply voltage rejection: 75dB (typical)
The LD1117S33TR can be used in a variety of applications that require a stable and reliable voltage supply. Here are some of the most common applications of this voltage regulator:
Battery-powered devices: The LD1117S33TR can be used in battery-powered devices to regulate the voltage and provide stable power to the circuit.
Microcontroller projects: The LD1117S33TR is commonly used in microcontroller projects that require a stable voltage supply.
Audio amplifiers: The LD1117S33TR can be used in audio amplifiers to provide a stable power supply to the amplifier circuit.
LED lighting: The LD1117S33TR can be used in LED lighting projects to regulate the voltage and provide stable power to the LEDs.
| Pin Number | Pin Name | Description |
| 1 | Ground | connected to the ground of the system |
| 2 | Vout | regulated output voltage |
| 3 | Vin | input voltage that is to be regulated |
LD1117S33TR block diagram
Circuit for increasing output voltage
Adjustable output voltage applications (with improved ripple rejection)
Application schematics
Package diagram
LD1117S33TR is a low dropout linear voltage regulator that offers several advantages and some disadvantages. Here are some of the advantages and disadvantages of LD1117S33TR:
Advantages:
Low dropout voltage: The LD1117S33TR has a low dropout voltage of 1.2V, which allows it to regulate voltage even when the input voltage is close to the output voltage. This feature makes it ideal for battery-powered applications.
High accuracy: The LD1117S33TR provides high output voltage accuracy, with a typical output voltage tolerance of +/- 1%.
Thermal overload protection: The LD1117S33TR includes thermal overload protection, which helps to prevent the device from overheating and becoming damaged.
Short circuit protection: The LD1117S33TR includes short circuit protection, which helps to prevent damage to the device in the event of a short circuit.
Low noise: The LD1117S33TR provides low output noise, making it ideal for sensitive applications.
Disadvantages:
Low efficiency: Compared to other types of voltage regulators, such as switching regulators, the LD1117S33TR has a lower efficiency, which means it generates more heat and wastes more energy.
Limited output current: The LD1117S33TR has a limited output current of 800mA, which means it may not be suitable for high current applications.
Limited input voltage range: The LD1117S33TR has a limited input voltage range of 4.75V to 15V, which means it may not be suitable for applications that require a wider input voltage range.
Package type: The LD1117S33TR is only available in a surface mount package, which may not be suitable for all applications.
Overall, LD1117S33TR is a reliable and accurate voltage regulator that offers several advantages, but it may not be suitable for all applications due to its limited input voltage range and output current, lower efficiency, and surface mount package type. It is important to carefully consider the specific requirements of your project before selecting a voltage regulator.
Download datasheets and manufacturer documentation for STMicroelectronics
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