Overview
The LD1084V18, produced by STMicroelectronics, is a low-drop voltage regulator designed to provide up to 5 A of output current. This regulator is part of the LD1084 series, known for its high performance and efficiency. It features a typical dropout voltage of 1.3 V at 5 A, which decreases at lower loads, and a maximum dropout voltage of 1.5 V. The LD1084V18 is pin-to-pin compatible with older 3-terminal adjustable regulators but offers improved performance in terms of dropout voltage and output tolerance.
The device is available in several packages, including TO-220, D2PAK, and D2PAK/A, and operates over a wide temperature range from -40 °C to 125 °C. The on-chip trimming ensures a tight output voltage tolerance of ±1% at 25 °C and ±2% over the full temperature range.
Key Specifications
| Symbol | Parameter | Test Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Vref | Reference voltage | IO = 10 mA, TJ = 25 °C | 1.237 | 1.25 | 1.263 | V |
| ΔVO | Line regulation | IO = 10 mA, VI = 2.85 to 16.5 V, TJ = 25 °C | 0.015 | 0.2 | % | |
| ΔVO | Load regulation | IO = 10 mA to 5 A, TJ = 25 °C | 0.1 | 0.3 | % | |
| Vd | Dropout voltage | IO = 5 A | 1.3 | 1.5 | V | |
| VI | DC input voltage | 30 | V | |||
| TOP | Operating junction temperature range | -40 | 125 | °C |
Key Features
- Low Dropout Voltage: Typical dropout voltage of 1.3 V at 5 A, with a maximum of 1.5 V.
- Adjustable Output Voltage: Three-terminal adjustable output voltage.
- High Output Current: Guaranteed output current up to 5 A.
- Tight Output Tolerance: Output tolerance of ±1% at 25 °C and ±2% over the full temperature range.
- Internal Power and Thermal Limit: Internal power and thermal limiting for protection.
- Wide Operating Temperature Range: Operates from -40 °C to 125 °C.
- Package Options: Available in TO-220, D2PAK, and D2PAK/A packages.
- Pinout Compatibility: Pin-to-pin compatible with standard adjustable VREG regulators.
- Efficient Quiescent Current: Quiescent current flows into the load, increasing efficiency.
Applications
The LD1084V18 is suitable for a variety of applications requiring high current and low dropout voltage, such as:
- Power supplies for industrial and consumer electronics.
- Active termination in SCSI-2 systems (e.g., the 2.85 V output version).
- High-current voltage regulation in automotive and aerospace systems.
- Telecommunication equipment and network devices.
- Medical devices requiring stable and efficient power supply.
Q & A
- What is the maximum output current of the LD1084V18?
The LD1084V18 can provide up to 5 A of output current.
- What is the typical dropout voltage of the LD1084V18 at 5 A?
The typical dropout voltage is 1.3 V at 5 A.
- What is the output voltage tolerance of the LD1084V18 at 25 °C?
The output voltage tolerance is ±1% at 25 °C.
- What are the available packages for the LD1084V18?
The LD1084V18 is available in TO-220, D2PAK, and D2PAK/A packages.
- What is the operating temperature range of the LD1084V18?
The operating temperature range is from -40 °C to 125 °C.
- Is the LD1084V18 pin-to-pin compatible with older regulators?
- What is the minimum capacitor required for stability?
A minimum capacitor of 10 µF is required for stability.
- How does the quiescent current of the LD1084V18 affect efficiency?
The quiescent current flows into the load, increasing efficiency.
- What are some common applications of the LD1084V18?
Common applications include power supplies, SCSI-2 active termination, and high-current voltage regulation in various industries.
- What is the maximum DC input voltage for the LD1084V18?
The maximum DC input voltage is 30 V.
