Overview
The LD1085DT18R is a low drop-out (LDO) linear voltage regulator produced by STMicroelectronics. This component is designed to provide a stable and efficient voltage regulation solution, particularly suitable for applications requiring high current output. The LD1085DT18R is available in a D²PAK package and offers a fixed output voltage of 1.8V with a maximum output current of 3A.
This regulator is known for its low dropout voltage of 1.3V at 3A, high output current capability, and tight output voltage tolerance of ±1% at 25°C. It also features internal power and thermal limiting, ensuring reliable operation over a wide temperature range from -40°C to 125°C.
Key Specifications
| Parameter | Test Condition | 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) | VI ≤ 30 V | 5 | 10 | mA | |
| Input Voltage (VI) | 30 | V | |||
| Operating Temperature | -40 | 125 | °C | ||
| Package | D²PAK |
Key Features
- Low Dropout Voltage: The LD1085DT18R has a typical dropout voltage of 1.3V at 3A, ensuring efficient operation even at low input voltages.
- High Output Current: Capable of delivering up to 3A of output current, making it suitable for high-current applications.
- Tight Output Voltage Tolerance: Maintains an output voltage tolerance of ±1% at 25°C and ±2% over the full temperature range.
- Internal Protection: Features internal power and thermal limiting to protect against overcurrent and overtemperature conditions.
- Wide Operating Temperature Range: Operates reliably from -40°C to 125°C.
- High PSRR: Offers a high power supply rejection ratio (PSRR) of 72dB at 120Hz.
- Low Quiescent Current: Quiescent current is 10mA, which is relatively low and helps in reducing power consumption.
- Surface Mount Package: Available in D²PAK and other surface mount packages, facilitating easy integration into modern PCB designs.
Applications
- General Purpose Power Supplies: Suitable for a wide range of power supply applications requiring stable and efficient voltage regulation.
- Industrial Control Systems: Used in industrial control systems where high reliability and stability are crucial.
- Automotive Systems: Can be used in automotive systems due to its wide operating temperature range and robust protection features.
- Consumer Electronics: Applicable in various consumer electronics such as audio equipment, medical devices, and other high-current applications.
- SCSI-2 Active Termination: The 2.85V output version is suitable for SCSI-2 active termination applications.
Q & A
- What is the maximum output current of the LD1085DT18R?
The LD1085DT18R can deliver up to 3A of output current.
- What is the typical dropout voltage of the LD1085DT18R?
The typical dropout voltage is 1.3V at 3A.
- What is the output voltage tolerance of the LD1085DT18R at 25°C?
The output voltage tolerance is ±1% at 25°C.
- What is the maximum input voltage for the LD1085DT18R?
The maximum input voltage is 30V.
- What are the protection features of the LD1085DT18R?
The device features internal overcurrent and overtemperature protection.
- What is the operating temperature range of the LD1085DT18R?
The operating temperature range is from -40°C to 125°C.
- What package types are available for the LD1085DT18R?
The LD1085DT18R is available in D²PAK and other surface mount packages.
- What is the quiescent current of the LD1085DT18R?
The quiescent current is 10mA.
- Is the LD1085DT18R RoHS compliant?
Yes, the LD1085DT18R is lead-free and RoHS compliant.
- What is the power supply rejection ratio (PSRR) of the LD1085DT18R?
The PSRR is 72dB at 120Hz.
