Overview
The LD1085DT25R is a low drop positive voltage regulator produced by STMicroelectronics. This component is part of the LD1085 series, which offers adjustable and fixed output voltage options. The LD1085DT25R specifically provides a fixed output voltage of 2.5 V. It is designed to deliver up to 3 A of output current, making it suitable for a variety of power supply applications. The regulator features a low dropout voltage of 1.3 V at 3 A, high output voltage tolerance, and internal power and thermal limiting, ensuring reliable operation over a wide temperature range of -40 °C to 125 °C.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | IO = 0 mA, TJ = 25°C | 2.475 | 2.5 | 2.525 | V |
| Output Voltage (VO) | IO = 0 to 3 A, VI = 4.1 to 30 V | 2.45 | 2.5 | 2.55 | V |
| Line Regulation (ΔVO) | IO = 0 mA, VI = 4.1 to 18 V, TJ = 25°C | 0.2 | - | 4 | mV |
| Load Regulation (ΔVO) | IO = 0 to 3 A, TJ = 25°C | 2 | - | 10 | mV |
| Dropout Voltage (Vd) | IO = 3 A | 1.3 | - | 1.5 | V |
| Quiescent Current (Iq) | VI ≤ 30 V | 5 | - | 10 | mA |
| Short-Circuit Current (Isc) | VI - VO = 5 V | 3.2 | - | 4.5 | A |
| Thermal Resistance Junction-Case (RthJC) | - | - | 3 | - | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | - | - | 50 | - | °C/W |
| Operating Junction Temperature (TOP) | - | - | -40 to 125 | - | °C |
Key Features
- Low Dropout Voltage: Typical dropout voltage of 1.3 V at 3 A, ensuring efficient power supply.
- High Output Current: Guaranteed output current up to 3 A.
- Tight Output Voltage Tolerance: Output voltage tolerance within ± 1% at 25 °C and ± 2% over the full temperature range.
- Internal Protection: Internal power and thermal limiting for safe operation.
- Wide Operating Temperature Range: Operates from -40 °C to 125 °C.
- Package Options: Available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
- Pin Compatibility: Pin-to-pin compatible with standard adjustable 3-terminal regulators.
- Efficient Quiescent Current: Quiescent current flows into the load, increasing efficiency.
Applications
- Power Supply Systems: Suitable for various power supply applications requiring high current and low dropout voltage.
- Industrial Control Systems: Used in industrial control systems where reliable and efficient power supply is crucial.
- Automotive Systems: Can be used in automotive systems due to its wide operating temperature range.
- Consumer Electronics: Applicable in consumer electronics that require stable and efficient power supply.
Q & A
- What is the typical dropout voltage of the LD1085DT25R at 3 A?
The typical dropout voltage is 1.3 V at 3 A.
- What is the maximum output current of the LD1085DT25R?
The maximum output current is 3 A.
- What is the output voltage tolerance of the LD1085DT25R at 25 °C?
The output voltage tolerance is within ± 1% at 25 °C.
- What are the available package options for the LD1085DT25R?
The available packages are TO-220, TO-220FP, D²PAK, and D²PAK/A.
- What is the operating junction temperature range of the LD1085DT25R?
The operating junction temperature range is -40 °C to 125 °C.
- Does the LD1085DT25R have internal protection features?
Yes, it has internal power and thermal limiting for safe operation.
- What is the quiescent current of the LD1085DT25R?
The quiescent current is 5 to 10 mA when VI ≤ 30 V.
- Is the LD1085DT25R pin-to-pin compatible with other regulators?
Yes, it is pin-to-pin compatible with standard adjustable 3-terminal regulators.
- What is the thermal resistance junction-case (RthJC) of the LD1085DT25R in TO-220 package?
The thermal resistance junction-case (RthJC) is 3 °C/W.
- What is the recommended minimum capacitor value for stability?
A minimum capacitor of 10 µF is recommended for stability.
