Overview
The LD1085V33 is a low drop positive voltage regulator produced by STMicroelectronics. This regulator is capable of providing up to 3 A of output current and is available in both adjustable and fixed output voltage configurations. The LD1085V33 is particularly notable for its low dropout voltage, high output current capability, and tight output voltage tolerance. It is pin-to-pin compatible with standard 3-terminal adjustable regulators but offers improved performance in terms of dropout voltage and output tolerance.
Key Specifications
| Parameter | Test Conditions | 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, VIN = 4.9 to 30 V | 3.234 | 3.3 | 3.366 | V |
| Line Regulation (∆VO) | VIN = 4.9 to 18 V, IO = 0 mA, TJ = 25°C | 0.5 | 6 | mV | |
| Load Regulation (∆VO) | IO = 0 to 3 A, TJ = 25°C | 3 | 15 | mV | |
| Dropout Voltage (Vd) | IO = 3 A | 1.3 | 1.5 | V | |
| Quiescent Current (Id) | VIN ≤ 30 V | 5 | 10 | mA | |
| Short-Circuit Current (ISC) | VIN - VO = 5 V | 3.2 | 4.5 | A | |
| Thermal Regulation | Ta = 25°C, 30 ms pulse | 0.008 | 0.04 | %/W | |
| Supply Voltage Rejection (SVR) | f = 120 Hz, CO = 25 µF, IO = 3 A, VIN = 8.3 ± 3 V | 60 | 72 | dB | |
| Output Noise Voltage (eN) | f = 10 Hz to 10 kHz, Ta = 25°C | 0.003 | % |
Key Features
- Low Dropout Voltage: The LD1085V33 has a typical dropout voltage of 1.3 V at 3 A, making it suitable for applications where minimal voltage loss is critical.
- High Output Current: Capable of providing up to 3 A of output current.
- Tight Output Voltage Tolerance: Output voltage tolerance is ±1% at 25°C and ±2% over the full temperature range.
- Internal Protection: Features internal power and thermal limiting to protect the device from overloads.
- Wide Operating Temperature Range: Operates from -40°C to 125°C.
- Package Variations: Available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
- Pinout Compatibility: Pin-to-pin compatible with standard 3-terminal adjustable regulators.
- Efficiency: Quiescent current flows into the load, increasing efficiency compared to PNP regulators.
Applications
- Power Supplies: Suitable for use in various power supply designs where a stable and efficient voltage regulation is required.
- Industrial Control Systems: Used in industrial control systems that demand reliable and stable voltage regulation.
- Automotive Systems: Applicable in automotive systems due to its wide operating temperature range and robust performance.
- Consumer Electronics: Can be used in consumer electronics such as audio equipment, medical devices, and other applications requiring stable voltage regulation.
Q & A
- What is the maximum output current of the LD1085V33?
The LD1085V33 can provide up to 3 A of output current.
- What is the typical dropout voltage of the LD1085V33 at 3 A?
The typical dropout voltage is 1.3 V at 3 A.
- What is the output voltage tolerance of the LD1085V33 at 25°C?
The output voltage tolerance is ±1% at 25°C.
- What are the available package types for the LD1085V33?
The LD1085V33 is available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
- What is the operating temperature range of the LD1085V33?
The operating temperature range is from -40°C to 125°C.
- Does the LD1085V33 have internal protection features?
Yes, it features internal power and thermal limiting to protect the device from overloads.
- How does the quiescent current of the LD1085V33 affect efficiency?
The quiescent current flows into the load, increasing efficiency compared to PNP regulators.
- What is the minimum capacitor required for stability?
A minimum capacitor of 10 µF is required for stability.
- Is the LD1085V33 pin-to-pin compatible with other regulators?
Yes, it is pin-to-pin compatible with standard 3-terminal adjustable regulators.
- What is the supply voltage rejection (SVR) of the LD1085V33?
The supply voltage rejection is 60 to 72 dB at 120 Hz with CO = 25 µF and IO = 3 A.
