Overview
The LDL1117S50R, produced by STMicroelectronics, is a high PSRR (Power Supply Rejection Ratio) low-dropout linear voltage regulator. This device is capable of providing a maximum current of 1.2 A with an input voltage range from 2.5 V to 18 V and a typical dropout voltage of 350 mV at 1.2 A. It is designed for applications requiring high stability and low noise, making it suitable for direct regulations in Switch-Mode Power Supplies (SMPS) and secondary linear regulations in DC-DC converters. The LDL1117S50R includes internal thermal, current, and power limitations, ensuring robust protection against overloads and overheating.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 2.5 to 18 | V |
| Output Voltage | 5.0 (other options available) | V |
| Maximum Output Current | 1.2 | A |
| Typical Dropout Voltage | 350 mV @ 1.2 A | mV |
| PSRR at 120 Hz | 87 dB | dB |
| Operating Temperature Range | -40 to 125 | °C |
| Package | SOT223 | |
| Thermal Resistance Junction-to-Ambient | 120 | °C/W |
| Maximum Junction Temperature | 150 | °C |
Key Features
- Input voltage range from 2.5 V to 18 V
- Available on fixed output voltages: 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3 V, 3.3 V, 5.0 V (other options available on request)
- Guaranteed output current of 1.2 A
- Typical dropout voltage of 350 mV @ 1.2 A
- Internal thermal, current, and power limitations
- High PSRR of 87 dB at 120 Hz
- Operating temperature range: -40 °C to 125°C
- SOT223 package
Applications
- Consumer electronics
- Industrial applications
- Switch-Mode Power Supplies (SMPS)
- Motherboard Point-of-Load (P.O.L.)
- DC-DC post-regulation
Q & A
- What is the maximum output current of the LDL1117S50R? The maximum output current is 1.2 A.
- What is the input voltage range for the LDL1117S50R? The input voltage range is from 2.5 V to 18 V.
- What is the typical dropout voltage of the LDL1117S50R? The typical dropout voltage is 350 mV at 1.2 A.
- What is the PSRR of the LDL1117S50R at 120 Hz? The PSRR is 87 dB at 120 Hz.
- What are the available output voltages for the LDL1117? Available output voltages include 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3 V, 3.3 V, and 5.0 V, with other options available on request.
- What type of package does the LDL1117S50R come in? The LDL1117S50R comes in an SOT223 package.
- What are the thermal protection features of the LDL1117S50R? The device includes thermal shutdown at 175 °C and automatic restart when the temperature falls below 150 °C.
- What kind of capacitors are recommended for use with the LDL1117S50R? Good quality ceramic capacitors, specifically X5R and X7R types, are recommended for input and output stability.
- What are some common applications for the LDL1117S50R? Common applications include consumer electronics, industrial applications, SMPS, motherboard P.O.L., and DC-DC post-regulation.
- Is the LDL1117S50R RoHS compliant? Yes, the LDL1117S50R is RoHS compliant with an Ecopack2 grade.
