Overview
The LD1117ADT33TR is a low drop voltage regulator produced by STMicroelectronics. It is part of the LD1117A series, which is capable of providing up to 1 A of output current. This specific model offers a fixed output voltage of 3.3 V. The device is available in various packages, including DPAK, SOT-223, and TO-220, each optimizing thermal characteristics and offering space-saving advantages. The LD1117A series is known for its high efficiency, ensured by an NPN pass transistor, and requires only a 10 μF minimum capacitor for stability. The output voltage tolerance is tight, within ± 2% at 25 °C, thanks to chip trimming.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 3.3 | V |
| Output Current | Up to 1 A | A |
| Dropout Voltage | 1.15 V typ. @ IOUT = 1 A, 25 °C | V |
| Quiescent Current | 5 mA typ. @ 25 °C | mA |
| Supply Voltage Rejection | 80 dB typ. @ 25 °C | dB |
| Operating Temperature Range | 0 °C to 125 °C | °C |
| Package Types | DPAK, SOT-223, TO-220 | |
| Thermal Resistance Junction-Case | 8 °C/W (DPAK) | °C/W |
| Thermal Resistance Junction-Ambient | 100 °C/W (DPAK) | °C/W |
Key Features
- Low dropout voltage: 1.15 V typ. @ IOUT = 1 A, 25 °C
- Very low quiescent current: 5 mA typ. @ 25 °C
- Output current up to 1 A
- Fixed output voltage of 3.3 V, with adjustable versions available (VREF = 1.25 V)
- Internal current and thermal limit
- Only 10 μF capacitor required for stability
- High supply voltage rejection: 80 dB typ. @ 25 °C
- Tight output voltage tolerance: ± 2% at 25 °C and ± 4% in full temperature range
Applications
The LD1117ADT33TR is suitable for various applications requiring a stable and efficient voltage regulation. These include:
- Industrial control systems
- Consumer electronics
- Automotive systems
- Telecommunication equipment
- Medical devices
Q & A
- What is the maximum output current of the LD1117ADT33TR?
The maximum output current is up to 1 A. - What are the available package types for the LD1117ADT33TR?
The device is available in DPAK, SOT-223, and TO-220 packages. - What is the typical dropout voltage of the LD1117ADT33TR at 1 A output current?
The typical dropout voltage is 1.15 V at 25 °C. - What is the quiescent current of the LD1117ADT33TR?
The quiescent current is 5 mA typ. @ 25 °C. - What is the operating temperature range of the LD1117ADT33TR?
The operating temperature range is from 0 °C to 125 °C. - Is the LD1117ADT33TR RoHS compliant?
Yes, the LD1117ADT33TR is RoHS compliant with an Ecopack2 grade. - What is the supply voltage rejection of the LD1117ADT33TR?
The supply voltage rejection is 80 dB typ. @ 25 °C. - How much capacitor is required for stability?
Only a 10 μF minimum capacitor is needed for stability. - What is the output voltage tolerance of the LD1117ADT33TR?
The output voltage tolerance is within ± 2% at 25 °C and ± 4% in the full temperature range. - Are there adjustable versions of the LD1117A series?
Yes, adjustable versions are available with a reference voltage (VREF) of 1.25 V.
