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Product Detailed Parameters
- Description：IC REG LIN 12V 3A DDPAK/TO-263-3
- Series：-
- Mfr：National Semiconductor
- Package：Bulk
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：18V
- Voltage - Output (Min/Fixed)：12V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.5V @ 3A
- Current - Output：3A
- Current - Quiescent (Iq)：10 mA
- Current - Supply (Max)：-
- PSRR：60dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Supplier Device Package：DDPAK/TO-263-3
- Grade：-
- Qualification：-
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Overview
The LM1085IS-12 is a fixed-output low dropout positive regulator manufactured by Texas Instruments, originally part of the National Semiconductor portfolio. It provides a fixed 12V output with a maximum load current of 3A. The device features a maximum dropout voltage of 1.5V at full load and supports input voltages up to 29V. It operates within a junction temperature range of -40°C to 125°C and includes internal thermal shutdown and current limiting protection.
Feature Summary
- Provides a fixed 12V regulated output voltage for stable power delivery
- Delivers high output current capability up to 3A for demanding loads
- Integrates thermal shutdown and current limiting for enhanced reliability
Applications
- Battery chargers requiring stable 12V regulation
- Post-regulators for switching power supplies
- On-card regulation for distributed power systems
Procurement Notes
Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment against TO-263 (DDPAK-3) specifications. Check for RoHS compliance markings if required by project standards. Ensure storage conditions prevent moisture damage prior to reflow soldering.
Selection Notes
Select this component when a fixed 12V output is required with high current capacity. Verify that the input voltage remains within the 29V maximum limit under all operating conditions. Consider thermal management requirements due to power dissipation at 3A loads. Ensure the PCB layout supports the TO-263 package thermal pad connection.
Part Context
This component belongs to the LM1085 family of 3A low dropout regulators. The 'IS' suffix indicates surface mount packaging in the TO-263 form factor. The '-12' designation specifies the fixed 12V output version. This series is widely used in industrial and consumer electronics for linear regulation applications.
Replacement Considerations
LM1085IS-12/NOPB is the direct equivalent with lead-free compliance. LM1085IT-12 offers the same electrical performance in a TO-220 package. Cross-reference with LM317-based designs only if adjustable output is acceptable.
