Overview
The LD1117D33TR is a low drop voltage regulator produced by STMicroelectronics. It is part of the LD1117 series, which offers both fixed and adjustable output voltage options. The LD1117D33TR specifically provides a fixed output voltage of 3.3V and can supply up to 800 mA of output current. This regulator is available in several package types, including SO-8, which is optimized for thermal characteristics and space efficiency. The device features an NPN pass transistor, ensuring high efficiency by allowing the quiescent current to flow mostly into the load. Only a minimum 10 µF capacitor is required for stability, and on-chip trimming ensures a tight output voltage tolerance of ±1% at 25°C.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | Vin = 5.3 V, IO = 10 mA, TJ = 25 °C | 3.267 | 3.3 | 3.333 | V |
| Output Voltage (VO) | IO = 0 to 800 mA, Vin = 4.75 to 10 V | 3.235 | 3.365 | V | |
| Line Regulation (∆VO) | Vin = 4.75 to 15 V, IO = 0 mA | 1 | 6 | mV | |
| Load Regulation (∆VO) | Vin = 4.75 V, IO = 0 to 800 mA | 1 | 10 | mV | |
| Operating Input Voltage (Vin) | IO = 100 mA | 15 | V | ||
| Quiescent Current (Id) | Vin ≤ 10 V | 5 | 10 | mA | |
| Output Current (IO) | Vin = 7.5 V, TJ = 25 °C | 800 | 950 | 1300 | mA |
| Dropout Voltage (Vd) | IO = 100 mA | 1 | 1.1 | V | |
| Supply Voltage Rejection (SVR) | IO = 40 mA, f = 120 Hz, TJ = 25 °C | 60 | 75 | dB |
Key Features
- Low Dropout Voltage: 1 V typical.
- High Output Current: Up to 800 mA.
- Fixed Output Voltages: Available in 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V.
- Adjustable Version: Available with VREF = 1.25 V.
- Internal Current and Thermal Limit: Built-in protection features.
- Tight Output Voltage Tolerance: ±1% at 25°C and ±2% over the full temperature range.
- High Supply Voltage Rejection: 75 dB typical.
- Thermal Efficiency: Optimized thermal characteristics with SOT-223 and DPAK packages.
Applications
- Communications Equipment: Suitable for use in various communication devices due to its stable output and high efficiency.
- Computers and Peripherals: Ideal for power supply in computer systems and peripherals requiring stable voltage regulation.
- Industrial Applications: Used in industrial settings where reliable and efficient voltage regulation is crucial.
- Personal Electronics: Suitable for portable and personal electronic devices requiring low dropout voltage and high current output).
Q & A
- What is the typical dropout voltage of the LD1117D33TR?
The typical dropout voltage is 1 V).
- What is the maximum output current of the LD1117D33TR?
The maximum output current is up to 800 mA).
- What are the available fixed output voltages for the LD1117 series?
The fixed output voltages available are 1.2 V, 1.8 V, 2.5 V, 3.3 V, and 5.0 V).
- Is the LD1117D33TR available in an adjustable version?
Yes, the LD1117 series includes an adjustable version with VREF = 1.25 V, but the LD1117D33TR is a fixed 3.3V version).
- What is the operating input voltage range for the LD1117D33TR?
The operating input voltage range is up to 15 V).
- What is the quiescent current of the LD1117D33TR?
The quiescent current is between 5 mA and 10 mA).
- What package types are available for the LD1117D33TR?
The LD1117D33TR is available in the SO-8 package type).
- What is the supply voltage rejection of the LD1117D33TR?
The supply voltage rejection is 75 dB typical).
- What are the thermal characteristics of the LD1117D33TR?
The device has optimized thermal characteristics, especially in SOT-223 and DPAK packages).
- What is the output voltage tolerance of the LD1117D33TR?
The output voltage tolerance is ±1% at 25°C and ±2% over the full temperature range).
