Overview
The LD1117ADT18TR is a low drop voltage regulator produced by STMicroelectronics. It is part of the LD1117A series, which is capable of providing up to 1 A of output current. This specific model, LD1117ADT18TR, offers a fixed output voltage of 1.8 V. The device is packaged in a DPAK (TO-252) package, which optimizes thermal characteristics and offers a space-saving advantage. The regulator features high efficiency due to an NPN pass transistor and requires only a 10 μF minimum capacitor for stability. It also includes internal current and thermal limiting, ensuring reliable operation over a temperature range of 0 °C to 125 °C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 1.8 V | V |
| Output Current | Up to 1 A | A |
| Dropout Voltage | 1.15 V typ. @ IOUT = 1 A, 25 °C | V |
| Quiescent Current | 5 mA typ. @ 25 °C | mA |
| Supply Voltage Rejection | 80 dB typ. @ 25 °C | dB |
| Operating Temperature Range | 0 °C to 125 °C | °C |
| Package Type | DPAK (TO-252) | |
| Thermal Resistance Junction-Case | 8 °C/W | °C/W |
| Thermal Resistance Junction-Ambient | 100 °C/W | °C/W |
Key Features
- Low dropout voltage: 1.15 V typ. @ IOUT = 1 A, 25 °C
- Very low quiescent current: 5 mA typ. @ 25 °C
- Output current up to 1 A
- Fixed output voltage of 1.8 V
- Adjustable version available (VREF = 1.25 V) in other models of the series
- Internal current and thermal limit
- Only 10 μF capacitor required for stability
- High supply voltage rejection: 80 dB typ. @ 25 °C
- Tight output voltage tolerance: ± 2% at 25 °C and ± 4% in full temperature range
Applications
The LD1117ADT18TR is suitable for various applications requiring a stable and efficient voltage regulation. These include:
- Industrial control systems
- Consumer electronics
- Automotive systems
- Telecommunication equipment
- Power supplies and DC-DC converters
Q & A
- What is the output voltage of the LD1117ADT18TR?
The output voltage of the LD1117ADT18TR is 1.8 V. - What is the maximum output current of the LD1117ADT18TR?
The maximum output current is up to 1 A. - What is the typical dropout voltage of the LD1117ADT18TR?
The typical dropout voltage is 1.15 V at IOUT = 1 A and 25 °C. - What is the quiescent current of the LD1117ADT18TR?
The quiescent current is 5 mA typ. at 25 °C. - What package type is the LD1117ADT18TR available in?
The LD1117ADT18TR is available in a DPAK (TO-252) package. - What is the operating temperature range of the LD1117ADT18TR?
The operating temperature range is 0 °C to 125 °C. - Does the LD1117ADT18TR have internal current and thermal limiting?
Yes, it does have internal current and thermal limiting. - How much capacitor is required for stability?
Only a 10 μF minimum capacitor is needed for stability. - What is the supply voltage rejection of the LD1117ADT18TR?
The supply voltage rejection is 80 dB typ. at 25 °C. - Is the LD1117ADT18TR RoHS compliant?
Yes, it is RoHS compliant with an Ecopack2 grade.
