Overview
The LD1117S50CTR 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 LD1117S50CTR is specifically a fixed output voltage regulator, delivering a stable 5.0 V output. 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 | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 4.9 | 5.0 | 5.1 | V |
| Line Regulation (∆VO) | 1 | - | 10 | mV |
| Load Regulation (∆VO) | 1 | - | 15 | mV |
| Temperature Stability (∆VO) | - | 0.5 | - | % |
| Long Term Stability (∆VO) | - | 0.3 | - | % (1000 hrs, TJ = 125°C) |
| Operating Input Voltage (Vin) | - | - | 15 | V |
| Quiescent Current (Id) | 5 | 10 | - | mA |
| Output Current (IO) | - | 800 | 1300 | mA |
| Dropout Voltage (Vd) | 1.0 | 1.1 | 1.2 | V (IO = 800 mA) |
| Supply Voltage Rejection (SVR) | 60 | 75 | - | dB |
Key Features
- Low dropout voltage (1 V typ.)
- Output current up to 800 mA
- Fixed output voltage of 5.0 V
- Adjustable version available (VREF = 1.25 V) in other models of the series
- Internal current and thermal limit
- Output voltage tolerance: ±1% at 25°C and ±2% in full temperature range
- Supply voltage rejection: 75 dB (typ.)
- Available in SOT-223, DPAK, SO-8, and TO-220 packages
- High efficiency due to NPN pass transistor
Applications
The LD1117S50CTR is suitable for various applications requiring stable and efficient voltage regulation. These include:
- Communications equipment
- Computers and peripherals
- Industrial applications
- Personal electronics
Q & A
- What is the maximum output current of the LD1117S50CTR?
The LD1117S50CTR can provide up to 800 mA of output current.
- What is the fixed output voltage of the LD1117S50CTR?
The fixed output voltage of the LD1117S50CTR is 5.0 V.
- What package is the LD1117S50CTR available in?
The LD1117S50CTR is available in the SOT-223 package.
- What is the typical dropout voltage of the LD1117S50CTR?
The typical dropout voltage is 1 V.
- Does the LD1117S50CTR have internal current and thermal limits?
- What is the supply voltage rejection of the LD1117S50CTR?
The supply voltage rejection is 75 dB (typ.).
- What is the output voltage tolerance of the LD1117S50CTR at 25°C?
The output voltage tolerance is ±1% at 25°C.
- What is the minimum capacitor required for stability?
A minimum 10 µF capacitor is required for stability.
- Is the LD1117S50CTR pin-to-pin compatible with other standard adjustable voltage regulators?
The adjustable version of the LD1117 series is pin-to-pin compatible with other standard adjustable voltage regulators.
- What are some common applications for the LD1117S50CTR?
Common applications include communications equipment, computers and peripherals, industrial applications, and personal electronics.
