Overview
The LD1117DT33TR is a low dropout voltage regulator produced by STMicroelectronics. This device is capable of providing up to 800 mA of output current and is available in both fixed and adjustable versions. The LD1117DT33TR specifically offers a fixed output voltage of 3.3 V. It features high efficiency due to its NPN pass transistor, which ensures that the quiescent current flows mostly into the load. The regulator is designed to operate with a minimum 10 µF capacitor for stability and boasts tight output voltage tolerance within ±1% at 25°C.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 3.267 | 3.3 | 3.333 | V |
| Operating Input Voltage (Vin) | - | - | 15 | V |
| Output Current (IO) | - | 950 | 1300 | mA |
| Quiescent Current (Id) | 5 | 10 | - | mA |
| Dropout Voltage (Vd) | 1 | 1.1 | 1.2 | V |
| Line Regulation (∆VO) | 1 | 6 | - | mV |
| Load Regulation (∆VO) | 1 | 10 | - | mV |
| Temperature Stability (∆VO) | 0.5 | - | - | % |
| Supply Voltage Rejection (SVR) | 60 | 75 | - | dB |
| Output Noise Voltage (eN) | - | 100 | - | µV |
| Operating Temperature Range | 0 | - | 125 | °C |
| Package Type | - | - | TO-252 (DPAK) | - |
Key Features
- Low Dropout Voltage: Typical dropout voltage of 1 V at IO = 100 mA.
- High Output Current: Up to 800 mA of output current.
- Fixed Output Voltage: Nominal output voltage of 3.3 V.
- Adjustable Version Availability: Although the LD1117DT33TR is fixed, the LD1117 series includes adjustable versions with VREF = 1.25 V.
- Internal Current and Thermal Limit: Built-in current and thermal limiting for protection.
- Tight Output Voltage Tolerance: Within ±1% at 25°C due to on-chip trimming.
- High Efficiency: NPN pass transistor ensures high efficiency by directing quiescent current mostly into the load.
- Low Output Noise Voltage: Typical output noise voltage of 100 µV (10 Hz to 10 kHz).
- High Supply Voltage Rejection: Typical supply voltage rejection of 75 dB.
Applications
- Power Supply Systems: Suitable for use in various power supply systems requiring low dropout voltage and high current output.
- Embedded Systems: Ideal for embedded systems that need stable and efficient voltage regulation.
- Industrial Automation: Used in industrial automation for reliable voltage regulation in control systems.
- Consumer Electronics: Applied in consumer electronics for efficient power management.
- SCSI-2 Active Termination: Suitable for SCSI-2 active termination due to its performance characteristics.
Q & A
- What is the maximum output current of the LD1117DT33TR?
The maximum output current of the LD1117DT33TR is 800 mA.
- What is the typical dropout voltage of the LD1117DT33TR?
The typical dropout voltage is 1.1 V at IO = 100 mA.
- What is the nominal output voltage of the LD1117DT33TR?
The nominal output voltage is 3.3 V.
- What is the operating temperature range of the LD1117DT33TR?
The operating temperature range is from 0°C to 125°C.
- What type of package does the LD1117DT33TR come in?
The LD1117DT33TR comes in a TO-252 (DPAK) package.
- What is the typical quiescent current of the LD1117DT33TR?
The typical quiescent current is 5 mA (Vin ≤ 15 V).
- What is the supply voltage rejection of the LD1117DT33TR?
The typical supply voltage rejection is 75 dB.
- Does the LD1117DT33TR have internal current and thermal limiting?
Yes, the LD1117DT33TR has built-in current and thermal limiting for protection.
- What is the output noise voltage of the LD1117DT33TR?
The typical output noise voltage is 100 µV (10 Hz to 10 kHz).
- Is the LD1117DT33TR suitable for SCSI-2 active termination?
Yes, it is suitable due to its performance characteristics.
