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Product Detailed Parameters
- Description：IC REG LINEAR POS ADJ 3A D2PAK
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Adjustable
- Number of Regulators：1
- Voltage - Input (Max)：30V
- Voltage - Output (Min/Fixed)：1.25V
- Voltage - Output (Max)：28.5V
- Voltage Dropout (Max)：1.5V @ 3A
- Current - Output：3A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：72dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Supplier Device Package：D2PAK
- Grade：-
- Qualification：-
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Overview
The LD1085D2T-R is a positive adjustable linear voltage regulator from STMicroelectronics, housed in a surface-mount D2PAK package. It delivers up to 3A output current with a maximum dropout voltage of 1.5V at full load. The device accepts input voltages up to 30V and provides an adjustable output range between 1.25V and 28.5V. It features internal thermal overload and short-circuit protection, operates within a temperature range of -40°C to +125°C, and maintains stability with a minimum 10μF output capacitor.
Feature Summary
- Provides high-current regulation up to 3A with low dropout characteristics
- Features internal thermal overload and short-circuit protection for robust operation
- Offers adjustable output voltage capability across a wide range
Applications
- General-purpose power supply management
- Battery chargers
- Post-regulation for switching regulators
Procurement Notes
Verify the specific suffix 'R' indicates tape-and-reel packaging when sourcing. Confirm RoHS compliance status as it varies by production batch. Ensure the D2PAK footprint matches the target PCB design. Check for lead-free specifications if required by assembly standards. Validate availability through authorized distributors to avoid counterfeit components.
Selection Notes
Select this component for applications requiring high output current with minimal heat dissipation due to low dropout voltage. It serves as a direct replacement for older three-terminal adjustable regulators while offering improved efficiency. Consider the D2PAK package for its thermal performance in surface-mount designs. Ensure the input voltage remains within the 30V absolute maximum rating.
Part Context
This part belongs to the LD1085 family of low-dropout linear regulators designed for high-efficiency power management. Unlike PNP-based regulators, it directs quiescent current into the load rather than wasting it, enhancing overall system efficiency. The series is known for pin compatibility with standard adjustable regulators while providing tighter output tolerance and better thermal handling.
Replacement Considerations
LD1085D2T33R (Fixed 3.3V variant)
FAQ
What is the minimum capacitance required for stability?
A minimum 10μF capacitor is required on the output to ensure stability.
How does the quiescent current flow compare to PNP regulators?
Unlike PNP regulators where quiescent current is wasted, the LD1085 directs quiescent current into the load, increasing efficiency.
