Overview
The LD1117S30TR is a low drop positive voltage regulator produced by STMicroelectronics. This component is part of the LD1117 series, which is known for its high efficiency and low dropout voltage. The LD1117S30TR specifically provides a fixed output voltage of 3V and can supply up to 800 mA of output current. It is available in the SOT-223 package, which optimizes thermal characteristics and offers a space-saving design. The regulator features an NPN pass transistor, ensuring that the quiescent current flows mostly into the load, enhancing efficiency. Only a minimum 10 μF capacitor is required for stability, and on-chip trimming allows for a tight output voltage tolerance within ± 1% at 25 °C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer | STMicroelectronics | |
| Part Number | LD1117S30TR | |
| Output Configuration | Positive Fixed | |
| Number of Regulators | 1 | |
| Voltage - Input (Max) | 15 | V |
| Voltage - Output (Fixed) | 3 | V |
| Current - Output | 800 mA | mA |
| Voltage Dropout (Max) | 1.2 V @ 800 mA | V |
| Current - Quiescent (Iq) | 10 mA | mA |
| Supply Voltage Rejection (PSRR) | 75 dB (120 Hz) | dB |
| Operating Temperature | 0°C ~ 125°C | °C |
| Package / Case | SOT-223 | |
| Protection Features | Over Current, Over Temperature |
Key Features
- Low dropout voltage (1 V typ.)
- Output current up to 800 mA
- Fixed output voltage of 3V
- Adjustable version available (VREF = 1.25 V) in the LD1117 series
- Internal current and thermal limit
- Tight output voltage tolerance within ± 1% at 25 °C and ± 2% in full temperature range
- Supply voltage rejection: 75 dB (typ.)
- High efficiency due to NPN pass transistor
- Minimum 10 μF capacitor required for stability
- Over current and over temperature protection features
Applications
- Communications equipment
- Computers and peripherals
- Industrial applications
- Personal electronics
- Portable applications requiring low dropout voltage regulators
Q & A
- What is the maximum output current of the LD1117S30TR?
The LD1117S30TR can supply up to 800 mA of output current.
- What is the fixed output voltage of the LD1117S30TR?
The fixed output voltage of the LD1117S30TR is 3V.
- What is the maximum input voltage for the LD1117S30TR?
The maximum input voltage for the LD1117S30TR is 15V.
- What is the typical dropout voltage of the LD1117S30TR?
The typical dropout voltage of the LD1117S30TR is 1.2V at 800 mA.
- What type of transistor is used in the LD1117S30TR?
The LD1117S30TR uses an NPN pass transistor.
- What is the quiescent current of the LD1117S30TR?
The quiescent current of the LD1117S30TR is 10 mA.
- What is the supply voltage rejection (PSRR) of the LD1117S30TR?
The supply voltage rejection (PSRR) of the LD1117S30TR is 75 dB at 120 Hz.
- What are the protection features of the LD1117S30TR?
The LD1117S30TR features over current and over temperature protection.
- What is the operating temperature range of the LD1117S30TR?
The operating temperature range of the LD1117S30TR is 0°C to 125°C.
- In what package is the LD1117S30TR available?
The LD1117S30TR is available in the SOT-223 package.
