Overview
The LD1085DT33R is a low drop positive voltage regulator produced by STMicroelectronics. This component is designed to provide up to 3 A of output current and is available in various fixed output voltage versions, including 3.3 V for the LD1085DT33R model. It is pin-to-pin compatible with older 3-terminal adjustable regulators but offers improved performance in terms of dropout voltage and output tolerance. The LD1085 series is known for its high efficiency, as the quiescent current flows into the load, enhancing overall performance.
Key Specifications
| Parameter | Test Condition | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | IO = 0 mA, TJ = 25°C | 3.267 | 3.3 | 3.333 | V |
| Output Voltage (VO) | IO = 0 to 3 A, VI = 4.9 to 30 V | 3.234 | 3.3 | 3.366 | V |
| Line Regulation (ΔVO) | IO = 0 mA, VI = 4.9 to 18 V, TJ = 25°C | 0.5 | - | 6 | mV |
| Load Regulation (ΔVO) | IO = 0 to 3 A, TJ = 25°C | 3 | - | 15 | 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 |
| Operating Junction Temperature (TOP) | - | -40 | - | 125 | °C |
| Thermal Resistance Junction-Ambient (RthJA) | TO-220 | - | - | 50 | °C/W |
Key Features
- Low Dropout Voltage: Typical dropout voltage of 1.3 V at 3 A output current.
- High Output Current: Guaranteed output current up to 3 A.
- Tight Output Voltage Tolerance: Output voltage tolerance of ±1% at 25°C and ±2% over the full temperature range.
- Internal Protection: Internal power and thermal limiting for enhanced reliability.
- Wide Operating Temperature Range: Operates from -40°C to 125°C.
- Package Options: Available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
- Efficient Quiescent Current: Quiescent current flows into the load, increasing efficiency.
- Stability: Requires only a 10 µF minimum capacitor for stability.
Applications
- Power Supplies: Suitable for use in various power supply applications requiring high current and low dropout voltage.
- Industrial Control Systems: Used in industrial control systems where reliable and stable voltage regulation is crucial.
- Automotive Systems: Can be used in automotive systems due to its wide operating temperature range and robust performance.
- Consumer Electronics: Applicable in consumer electronics that require efficient and reliable voltage regulation.
Q & A
- What is the maximum output current of the LD1085DT33R?
The LD1085DT33R can provide up to 3 A of output current.
- What is the typical dropout voltage of the LD1085DT33R at 3 A output current?
The typical dropout voltage is 1.3 V at 3 A output current.
- What is the output voltage tolerance of the LD1085DT33R at 25°C?
The output voltage tolerance is ±1% at 25°C.
- What are the available package options for the LD1085DT33R?
The LD1085DT33R is available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
- What is the minimum capacitor required for stability?
A minimum of 10 µF capacitor is required for stability.
- What is the operating junction temperature range of the LD1085DT33R?
The operating junction temperature range is from -40°C to 125°C.
- Does the LD1085DT33R have internal protection features?
Yes, it has internal power and thermal limiting for enhanced reliability.
- How does the quiescent current of the LD1085DT33R contribute to efficiency?
The quiescent current flows into the load, increasing efficiency.
- What is the thermal resistance junction-ambient for the TO-220 package?
The thermal resistance junction-ambient for the TO-220 package is 50 °C/W.
- What are some common applications of the LD1085DT33R?
Common applications include power supplies, industrial control systems, automotive systems, and consumer electronics.
