Overview
The LD1085D2T-R, produced by STMicroelectronics, is a low drop positive voltage regulator that offers both adjustable and fixed output voltage options. This regulator is capable of providing up to 3 A of output current and is known for its high efficiency and tight output voltage tolerance. The LD1085 is pin-to-pin compatible with older 3-terminal adjustable regulators but offers improved performance in terms of dropout voltage and output tolerance. It is available in various packages including TO-220, TO-220FP, D²PAK, and D²PAK/A, making it versatile for different application needs.
Key Specifications
| Parameter | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|
| Output Voltage (VO) | 1.764 (for 1.8V), 2.45 (for 2.5V), 3.234 (for 3.3V), 4.9 (for 5V) | 1.8, 2.5, 3.3, 5 | 1.836 (for 1.8V), 2.55 (for 2.5V), 3.366 (for 3.3V), 5.1 (for 5V) | V |
| Output Current (IO) | 0 | - | 3 | A |
| Dropout Voltage (Vd) | 1.3 | 1.5 | - | V |
| Quiescent Current (Iq) | 5 | - | 10 | mA |
| Line Regulation (ΔVO) | 0.2 | - | 10 | mV |
| Load Regulation (ΔVO) | 2 | - | 20 | mV |
| Operating Temperature Range (TOP) | -40 | - | 125 | °C |
| Thermal Resistance Junction-Case (RthJC) | 3 | - | - | °C/W |
| Thermal Resistance Junction-Ambient (RthJA) | 50 | - | 62.5 | °C/W |
Key Features
- Tight output voltage tolerance: ±1% at 25°C and ±2% over the full temperature range.
- Low dropout voltage: 1.3 V typical at 3 A output current.
- High output current capability: up to 3 A.
- Internal power and thermal limiting.
- Wide operating temperature range: -40°C to 125°C.
- Pin-to-pin compatibility with standard adjustable voltage regulators.
- Efficient operation with quiescent current flowing into the load.
- Minimum capacitor requirement for stability: 10 µF.
- Available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
Applications
- Power supplies for various electronic devices.
- Industrial control systems.
- Automotive systems.
- Consumer electronics requiring stable voltage regulation.
- Telecommunication equipment.
- Medical devices requiring precise voltage control.
Q & A
- What is the maximum output current of the LD1085D2T-R?
The LD1085D2T-R can provide up to 3 A of output current.
- What are the available output voltage options for the LD1085D2T-R?
The LD1085D2T-R is available with fixed output voltages of 1.8 V, 2.5 V, 3.3 V, and 5 V, as well as an adjustable output voltage option.
- What is the typical dropout voltage of the LD1085D2T-R 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 LD1085D2T-R?
The operating temperature range is -40°C to 125°C.
- What packages are available for the LD1085D2T-R?
The LD1085D2T-R is available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
- What is the minimum capacitor requirement for stability?
A minimum capacitor of 10 µF is required for stability.
- Does the LD1085D2T-R have internal thermal limiting?
Yes, the LD1085D2T-R has internal power and thermal limiting.
- What is the quiescent current of the LD1085D2T-R?
The quiescent current is typically 5 mA and can be up to 10 mA.
- How does the LD1085D2T-R improve efficiency compared to older regulators?
The quiescent current of the LD1085D2T-R flows into the load, increasing efficiency compared to older PNP regulators where part of the output current is wasted as quiescent current.
- What are some common applications of the LD1085D2T-R?
Common applications include power supplies, industrial control systems, automotive systems, consumer electronics, telecommunication equipment, and medical devices.
