Overview
The LD1117S18TR is a low drop voltage regulator produced by STMicroelectronics. This component is part of the LD1117 series, which is capable of providing up to 800 mA of output current. The LD1117S18TR is specifically configured to provide a fixed output voltage of 1.8 V. It is available in the SOT-223 package, which optimizes thermal characteristics and offers a space-saving design. The regulator features high efficiency due to its NPN pass transistor, ensuring that the quiescent current flows mostly into the load. Only a minimum 10 µF capacitor is required for stability, and on-chip trimming allows for a tight output voltage tolerance of ± 1% at 25 °C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 1.8 V | V |
| Output Current | Up to 800 mA | mA |
| Dropout Voltage | 1 V (typ.) | V |
| Supply Voltage Rejection | 75 dB (typ.) | dB |
| Operating Input Voltage | Up to 15 V | V |
| Quiescent Current | 5-10 mA | mA |
| Thermal Resistance Junction-Ambient (SOT-223) | 110 °C/W | °C/W |
| Operating Junction Temperature Range | 0 to +125 °C | °C |
| Storage Temperature Range | -40 to +150 °C | °C |
Key Features
- Low dropout voltage (1 V typ.)
- Output current up to 800 mA
- Fixed output voltage of 1.8 V
- Adjustable version available (VREF = 1.25 V) in the LD1117 series
- Internal current and thermal limit
- Output voltage tolerance within ± 1% at 25 °C and ± 2% in full temperature range
- High efficiency due to NPN pass transistor
- Minimum 10 µF capacitor required for stability
- Pin to pin compatible with other standard adjustable voltage regulators
Applications
The LD1117S18TR is suitable for various applications requiring stable and efficient voltage regulation. These include:
- Communications equipment
- Computers and peripherals
- Industrial applications
- Personal electronics
- Portable applications where space and thermal efficiency are critical
Q & A
- What is the output voltage of the LD1117S18TR?
The output voltage of the LD1117S18TR is 1.8 V.
- What is the maximum output current of the LD1117S18TR?
The maximum output current is up to 800 mA.
- What is the typical dropout voltage of the LD1117S18TR?
The typical dropout voltage is 1 V.
- What package types are 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 LD1117S18TR?
The operating input voltage range is up to 15 V.
- What is the quiescent current of the LD1117S18TR?
The quiescent current is between 5-10 mA.
- What is the thermal resistance junction-ambient for the SOT-223 package?
The thermal resistance junction-ambient for the SOT-223 package is 110 °C/W.
- What is the operating junction temperature range for the LD1117S18TR?
The operating junction temperature range is 0 to +125 °C.
- What is the storage temperature range for the LD1117S18TR?
The storage temperature range is -40 to +150 °C.
- What applications is the LD1117S18TR suitable for?
The LD1117S18TR is suitable for communications equipment, computers and peripherals, industrial applications, personal electronics, and portable applications.
