Overview
The LD1117DT12CTR, produced by STMicroelectronics, is a low dropout voltage regulator designed to provide a stable output voltage with high efficiency. This regulator is capable of delivering up to 800 mA of output current and is available in both fixed and adjustable output voltage versions. The fixed versions offer output voltages of 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V, while the adjustable version allows for a reference voltage (VREF) of 1.25 V. The LD1117 series is known for its low dropout voltage, typically around 1 V, and its internal current and thermal limiting features, ensuring reliable operation under various conditions.
Key Specifications
| Parameter | Min. | Max. | Unit | |
|---|---|---|---|---|
| Output Voltage (VO) | 1.188 | 1.20 | 1.212 | V |
| Output Current (IO) | 0 | - | 800 | mA |
| Dropout Voltage (Vd) | 1.0 | - | 1.2 | V |
| Line Regulation (∆VO) | 0.035 | 0.2 | - | % |
| Load Regulation (∆VO) | 0.1 | 0.4 | - | % |
| Temperature Stability (∆VO) | - | 0.5 | - | % |
| Supply Voltage Rejection (SVR) | 60 | 75 | - | dB |
| Quiescent Current (Id) | 5 | 10 | - | mA |
| Operating Input Voltage (Vin) | - | - | 15 | V |
| Thermal Resistance Junction-Case (RthJC) | - | - | 15 | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | - | - | 110 | °C/W |
Key Features
- Low Dropout Voltage: Typically 1 V, ensuring minimal voltage loss.
- High Output Current: Up to 800 mA, suitable for a variety of applications.
- Fixed and Adjustable Output Voltages: Fixed versions available in 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V; adjustable version with VREF = 1.25 V.
- Internal Current and Thermal Limiting: Protects the device from overcurrent and overheating.
- Tight Output Voltage Tolerance: ±1% at 25°C and ±2% over the full temperature range.
- High Efficiency: Achieved through the use of an NPN pass transistor, where quiescent current flows mostly into the load.
- Low Quiescent Current: Typically 5-10 mA, contributing to energy efficiency.
- High Supply Voltage Rejection: Up to 75 dB, ensuring stable output voltage despite input voltage variations.
- Compact Packages: Available in SOT-223, DPAK, SO-8, and TO-220 packages, optimizing thermal characteristics and space usage.
Applications
- Power Supplies: Suitable for use in linear power supplies where low dropout voltage and high current capability are required.
- Embedded Systems: Ideal for powering microcontrollers, sensors, and other components in embedded systems.
- Industrial Automation: Used in various industrial automation applications where reliable and stable voltage regulation is crucial.
- Consumer Electronics: Found in consumer electronics such as audio equipment, set-top boxes, and other devices requiring stable power supply.
- Automotive Systems: Used in automotive systems where robust and reliable voltage regulation is necessary.
Q & A
- What is the maximum output current of the LD1117DT12CTR?
The LD1117DT12CTR can provide up to 800 mA of output current.
- What are the available fixed output voltages for the LD1117 series?
The fixed output voltages available are 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
- What is the typical dropout voltage of the LD1117DT12CTR?
The typical dropout voltage is around 1 V.
- What is the reference voltage for the adjustable version of the LD1117?
The reference voltage (VREF) for the adjustable version is 1.25 V.
- What are the package options available for the LD1117 series?
The LD1117 series is available in SOT-223, DPAK, SO-8, and TO-220 packages.
- What is the operating input voltage range for the LD1117DT12CTR?
The operating input voltage range is up to 15 V.
- What is the quiescent current of the LD1117DT12CTR?
The quiescent current is typically between 5-10 mA.
- How does the LD1117DT12CTR protect against overcurrent and overheating?
The device has internal current and thermal limiting features to protect against overcurrent and overheating.
- What is the supply voltage rejection of the LD1117DT12CTR?
The supply voltage rejection is up to 75 dB.
- What is the thermal resistance junction-case (RthJC) for the SOT-223 package?
The thermal resistance junction-case (RthJC) for the SOT-223 package is 15 °C/W.
