Overview
The LD1085D2T15R, produced by STMicroelectronics, is a 3 A low drop positive voltage regulator available in the D²PAK package. This regulator is designed to provide a fixed output voltage of 1.5 V and is part of the LD1085 series, which offers adjustable and fixed output voltage options. The LD1085D2T15R is known for its high efficiency and low dropout voltage, making it suitable for a wide range of applications where stable and reliable voltage regulation is required.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 1.5 | V |
| Output Current | Up to 3 A | A |
| Dropout Voltage | 1.3 V (at 3 A) | V |
| Output Tolerance | ±1% at 25 °C, ±2% in full temperature range | % |
| Input Voltage | Up to 30 V | V |
| Operating Temperature Range | -40 °C to 125 °C | °C |
| Thermal Resistance Junction-case | 3 °C/W | °C/W |
| Thermal Resistance Junction-ambient | 62.5 °C/W | °C/W |
| Package | D²PAK |
Key Features
- Low dropout voltage of 1.3 V at 3 A, decreasing at lower loads
- Guaranteed output current up to 3 A
- Tight output voltage tolerance: ±1% at 25 °C and ±2% in full temperature range
- Internal power and thermal limit for protection
- Wide operating temperature range: -40 °C to 125 °C
- Pin-to-pin compatibility with standard adjustable voltage regulators
- High efficiency due to quiescent current flowing into the load
- Minimum 10 µF capacitor required for stability
Applications
- Power supplies for various electronic devices requiring stable voltage regulation
- Active termination in SCSI-2 applications (for 2.85 V versions)
- Industrial control systems
- Automotive systems
- Consumer electronics
- Telecommunication equipment
Q & A
- What is the maximum output current of the LD1085D2T15R?
The LD1085D2T15R can provide up to 3 A of output current.
- What is the dropout voltage of the LD1085D2T15R at 3 A?
The dropout voltage is guaranteed at a maximum of 1.3 V at 3 A.
- What is the output voltage tolerance of the LD1085D2T15R?
The output voltage tolerance is ±1% at 25 °C and ±2% in the full temperature range.
- What is the operating temperature range of the LD1085D2T15R?
The operating temperature range is -40 °C to 125 °C.
- What package is the LD1085D2T15R available in?
The LD1085D2T15R is available in the D²PAK package.
- Is the LD1085D2T15R compatible with standard adjustable voltage regulators?
Yes, it is pin-to-pin compatible with standard adjustable voltage regulators.
- What is the minimum capacitor required for stability?
A minimum of 10 µF capacitor is required for stability.
- What are some typical applications of the LD1085D2T15R?
Typical applications include power supplies, industrial control systems, automotive systems, consumer electronics, and telecommunication equipment.
- How does the quiescent current of the LD1085D2T15R affect efficiency?
The quiescent current flows into the load, increasing efficiency compared to PNP regulators where part of the output current is wasted as quiescent current.
- What are the thermal resistance values for the LD1085D2T15R?
The thermal resistance junction-case is 3 °C/W, and the thermal resistance junction-ambient is 62.5 °C/W.
