Overview
The LD1117DT18TR is a low drop fixed positive voltage regulator produced by STMicroelectronics. This regulator is designed to provide a fixed output voltage of 1.8 V and can supply up to 1300 mA of output current. It is available in a surface mount TO-252-3 (DPAK) package, which optimizes thermal characteristics and offers a space-saving design. The device features high efficiency due to an NPN pass transistor, ensuring that the quiescent current flows mostly into the load. Only a minimum 10 µF capacitor is required for stability, and chip trimming allows the regulator to achieve a tight output voltage tolerance of ±1% at 25 °C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage (Max) | 15 | V |
| Output Voltage (Fixed) | 1.8 | V |
| Dropout Voltage (Max) | 1.2 | V |
| Output Current (Max) | 1300 | mA |
| Package Style | TO-252-3 (DPAK) | |
| Mounting Method | Surface Mount | |
| Quiescent Current | 5 - 10 | mA |
| Supply Voltage Rejection | 75 | dB (typ.) |
| Output Noise Voltage | 100 | µV |
Key Features
- Low dropout voltage (1 V typ.)
- Output current up to 1300 mA
- Fixed output voltage of 1.8 V
- Adjustable version availability (VREF = 1.25 V) for other models in the series
- Internal current and thermal limit
- Available in ±1% (at 25 °C) and 2% in full temperature range
- Supply voltage rejection: 75 dB (typ.)
- High efficiency assured by NPN pass transistor
- Only a 10 µF minimum capacitor needed for stability
Applications
The LD1117DT18TR is suitable for various applications requiring a stable and efficient voltage regulation. These include:
- Power supplies for electronic devices
- SCSI-2 active termination due to its 2.85 V device performances
- Embedded systems and IoT devices requiring low dropout voltage regulators
- Automotive and industrial electronics where high efficiency and thermal stability are crucial
Q & A
- What is the output voltage of the LD1117DT18TR?
The output voltage of the LD1117DT18TR is 1.8 V.
- What is the maximum output current of the LD1117DT18TR?
The maximum output current of the LD1117DT18TR is up to 1300 mA.
- What is the package style of the LD1117DT18TR?
The LD1117DT18TR is available in a TO-252-3 (DPAK) surface mount package.
- What is the dropout voltage of the LD1117DT18TR?
The dropout voltage of the LD1117DT18TR is typically 1.2 V.
- What is the quiescent current of the LD1117DT18TR?
The quiescent current of the LD1117DT18TR is between 5 and 10 mA.
- What is the supply voltage rejection of the LD1117DT18TR?
The supply voltage rejection of the LD1117DT18TR is typically 75 dB.
- What capacitor value is required for stability?
A minimum 10 µF capacitor is required for stability.
- What is the operating input voltage range of the LD1117DT18TR?
The operating input voltage range of the LD1117DT18TR is up to 15 V.
- Is the LD1117DT18TR available in adjustable versions?
No, the LD1117DT18TR is a fixed voltage regulator, but the LD1117 series does offer adjustable versions.
- What are some common applications for the LD1117DT18TR?
Common applications include power supplies, SCSI-2 active termination, embedded systems, and automotive and industrial electronics.
