Overview
The LD1085D2T18R is a low drop positive voltage regulator produced by STMicroelectronics. This component is capable of providing up to 3 A of output current and features a typical dropout voltage of 1.3 V at the maximum output current. It is designed to be pin-to-pin compatible with older 3-terminal adjustable regulators but offers improved performance in terms of dropout and output tolerance. The LD1085D2T18R is available in various packages, including TO-220, TO-220FP, D²PAK, and D²PAK/A, making it versatile for different application needs.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage | IO = 0 mA, TJ = 25°C | 1.782 | 1.8 | 1.818 | V |
| Output Voltage | IO = 0 to 3 A, VI = 3.4 to 30 V | 1.764 | 1.8 | 1.836 | V |
| Line Regulation | VI = 3.4 to 18 V, IO = 0 mA, TJ = 25°C | 0.2 | 4 | 4 | mV |
| Load Regulation | IO = 0 to 3 A, TJ = 25°C | 2 | 10 | 10 | mV |
| Dropout Voltage | IO = 3 A | 1.3 | 1.5 | 1.5 | V |
| Quiescent Current | VI ≤ 30 V | 5 | 10 | 10 | mA |
| Short Circuit Current | VI - VO = 5 V | 3.2 | 4.5 | 4.5 | A |
| Operating Temperature Range | -40 | 125 | °C | ||
| Package | TO-220, TO-220FP, D²PAK, D²PAK/A |
Key Features
- Typical dropout voltage of 1.3 V at 3 A output current
- Three-terminal adjustable or fixed output voltage options: 1.8 V, 2.5 V, 3.3 V, 5 V
- Guaranteed output current up to 3 A
- Output tolerance ± 1% at 25 °C and ± 2% in full temperature range
- Internal power and thermal limit
- Wide operating temperature range: -40 °C to 125 °C
- Available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages
- Pinout compatibility with standard adjustable voltage regulators
- Only a 10 µF minimum capacitor required for stability
Applications
The LD1085D2T18R is suitable for a variety of applications requiring a stable and efficient voltage regulation. These include:
- Industrial control systems
- Automotive systems
- Consumer electronics
- Medical devices
- Telecommunication equipment
Q & A
- What is the maximum output current of the LD1085D2T18R?
The LD1085D2T18R can provide up to 3 A of output current.
- What are the available output voltage options for the LD1085D2T18R?
The available output voltage options are 1.8 V, 2.5 V, 3.3 V, and 5 V.
- What is the typical dropout voltage of the LD1085D2T18R at 3 A output current?
The typical dropout voltage is 1.3 V at 3 A output current.
- What is the operating temperature range of the LD1085D2T18R?
The operating temperature range is -40 °C to 125 °C.
- What packages are available for the LD1085D2T18R?
The device is available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
- Is the LD1085D2T18R pin-to-pin compatible with older 3-terminal adjustable regulators?
Yes, it is pin-to-pin compatible with older 3-terminal adjustable regulators.
- What is the minimum capacitor required for stability?
A minimum of 10 µF capacitor is required for stability.
- Does the LD1085D2T18R have internal power and thermal limits?
Yes, it has internal power and thermal limits.
- What is the output tolerance of the LD1085D2T18R at 25 °C and in the full temperature range?
The output tolerance is ± 1% at 25 °C and ± 2% in the full temperature range.
- How does the quiescent current of the LD1085D2T18R affect efficiency?
The quiescent current flows into the load, thus increasing efficiency.
