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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 3A TO263-3
- Series：-
- Mfr：TAEJIN
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：15V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：1.5V @ 3A
- Current - Output：3A
- Current - Quiescent (Iq)：-
- Current - Supply (Max)：10 mA
- PSRR：65dB (120Hz)
- Control Features：-
- Protection Features：Over Current, Over Temperature, Short Circuit
- 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：TO-263-3
- Grade：-
- Qualification：-
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Overview
The LM1085R-3.3 is a fixed positive low dropout voltage regulator manufactured by TAEJIN Technology (HTC). It provides a nominal output voltage of 3.3V with a maximum continuous output current capability of 3.0A. The device features a guaranteed maximum dropout voltage of 1.5V at full load current. It is housed in a surface-mount TO-263-3L package and includes internal thermal limiting and current limiting protection circuits to safeguard against overload conditions.
Feature Summary
- Delivers a fixed 3.3V output with 3.0A current capacity
- Ensures low dropout performance with a maximum of 1.5V at full load
- Integrates internal thermal shutdown and current limiting for robust protection
- Compatible with standard three-terminal adjustable regulator pinouts
Applications
- Battery Charger systems
- Adjustable Power Supplies
- Portable Instrumentation
- High Efficiency Linear Power Supplies
- Powering VGA & Sound Card circuits
Procurement Notes
Verify the specific manufacturer designation, as the LM1085 series is widely produced by multiple vendors including Texas Instruments and National Semiconductor. Confirm that the component is sourced from TAEJIN Technology (HTC) rather than other manufacturers when strict brand compliance is required. Check datasheet revisions to ensure electrical characteristics match the intended design specifications.
Selection Notes
Select this component for applications requiring high current regulation with minimal input-to-output voltage differential. Ensure the input voltage remains within the absolute maximum rating of 15V. Verify that the thermal management strategy accounts for junction-to-case resistance, as the device relies on internal thermal limiting for protection under heavy load or high ambient temperature conditions.
Part Context
This part belongs to the LM1085 series of low dropout positive voltage regulators. The series offers both adjustable and fixed output versions, providing higher efficiency compared to traditional linear regulators. The LM1085R variant specifically denotes the fixed output version packaged in the TO-263-3L surface mount format, optimized for space-constrained PCB layouts.
Replacement Considerations
LM1085R-ADJ (Adjustable version in same package)
FAQ
What is the minimum output capacitor requirement for stability?
The circuit requires an output capacitor for frequency compensation. A 22µF solid tantalum or 150µF aluminum electrolytic capacitor ensures stability for all operating conditions.
Does the LM1085R-3.3 require external protection diodes?
Under normal operation, no protection diodes are needed between the adjustment pin and output or from output to input due to internal current limiting resistors.
