Overview
The LD1085V18 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 LD1085V18 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 voltage regulators but offers improved performance in terms of dropout voltage and output tolerance. The device is suitable for a wide range of applications requiring stable and efficient voltage regulation.
Key Specifications
| Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|
| Output Voltage (VO) | IO = 0 mA, TJ = 25°C | 1.782 | 1.8 | 1.818 | V |
| Output Voltage (VO) | IO = 0 to 3 A, VI = 3.4 to 30 V | 1.764 | 1.8 | 1.836 | V |
| Line Regulation (ΔVO) | IO = 0 mA, VI = 3.4 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) | 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 = 7.5 ± 3 V | 60 | 72 | dB | |
| Output Noise Voltage (eN) | f = 10 Hz to 10 kHz, TA = 25°C | 0.003 | % | ||
| Temperature Stability | 0.5 | % | |||
| Long Term Stability | 1000 Hrs, TA = 125°C | 0.5 | % |
Key Features
- Low Dropout Voltage: The LD1085V18 has a typical dropout voltage of 1.3 V at 3 A, ensuring efficient voltage regulation even at low input voltages.
- High Output Current: Capable of providing up to 3 A of output current, making it suitable for high-current applications.
- Tight Output Voltage Tolerance: The output voltage tolerance is ±1% at 25°C and ±2% over the full temperature range, ensuring stable output voltage.
- Internal Power and Thermal Limit: Built-in thermal and power limiting features protect the device from overheating and overcurrent conditions.
- Wide Operating Temperature Range: Operates from -40°C to 125°C, making it versatile for various environmental conditions.
- Package Options: Available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages, offering flexibility in design and layout.
- Pinout Compatibility: Compatible with standard 3-terminal adjustable voltage regulators, simplifying upgrades and replacements.
- Low Quiescent Current: Quiescent current flows into the load, increasing efficiency and reducing wasted current.
Applications
- Power Supplies: Ideal for use in power supply units requiring high current and low dropout voltage.
- Industrial Control Systems: Suitable for industrial control systems that need stable and efficient voltage regulation.
- Automotive Systems: Can be used in automotive applications due to its wide operating temperature range and robust performance.
- Consumer Electronics: Applicable in consumer electronics such as audio equipment, medical devices, and other high-current applications.
- Telecommunications: Used in telecommunications equipment where reliable and efficient voltage regulation is critical.
Q & A
- What is the maximum output current of the LD1085V18?
The LD1085V18 can provide up to 3 A of output current.
- What is the typical dropout voltage of the LD1085V18 at 3 A?
The typical dropout voltage is 1.3 V at 3 A.
- What is the output voltage tolerance of the LD1085V18 at 25°C?
The output voltage tolerance is ±1% at 25°C.
- What are the available package options for the LD1085V18?
The LD1085V18 is available in TO-220, TO-220FP, D²PAK, and D²PAK/A packages.
- Is the LD1085V18 compatible with standard 3-terminal adjustable voltage regulators?
Yes, it is pin-to-pin compatible with standard 3-terminal adjustable voltage regulators.
- What is the operating temperature range of the LD1085V18?
The operating temperature range is from -40°C to 125°C.
- What is the quiescent current of the LD1085V18?
The quiescent current is 5 to 10 mA when VIN ≤ 30 V.
- How does the LD1085V18 handle short-circuit conditions?
The device has built-in short-circuit current limiting, with a short-circuit current of 3.2 to 4.5 A when VIN - VO = 5 V.
- What is the supply voltage rejection (SVR) of the LD1085V18?
The SVR is 60 to 72 dB at f = 120 Hz, CO = 25 µF, and IO = 3 A.
- What is the output noise voltage of the LD1085V18?
The output noise voltage is 0.003% of VO at f = 10 Hz to 10 kHz and TA = 25°C.
