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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 3A DPAK
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：6V
- Voltage - Output (Min/Fixed)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.4V @ 3A
- Current - Output：3A
- Current - Quiescent (Iq)：5 µA
- Current - Supply (Max)：2.5 mA
- PSRR：65dB ~ 55dB (120Hz ~ 1kHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：TO-252-3, DPAK (2 Leads + Tab), SC-63
- Supplier Device Package：DPAK
- Grade：-
- Qualification：-
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Overview
The LD39300DT33-R is a fixed-output ultra low dropout linear regulator manufactured by STMicroelectronics. It provides a guaranteed 3A output current with an input voltage range of 2.5V to 6V. The device features a typical dropout voltage of 40mV at 600mA and 200mV at 3A load. Quiescent current is 1.2mA in ON mode, dropping to 1µA maximum in OFF mode. Output voltage tolerance is ±1.5% at 25°C. It includes logic-controlled electronic shutdown, internal current and thermal limits, and operates within a temperature range of -40°C to 125°C.
Feature Summary
- Ultra low dropout voltage performance for high efficiency operation under heavy loads
- Logic-controlled electronic shutdown capability for significant power reduction
- Internal current and thermal limiting protection mechanisms
- Stable operation with ceramic output capacitors
Applications
- Microprocessor power supply
- DSPs power supply
- Post regulators for switching supplies
- High efficiency linear regulator
Procurement Notes
Verify the specific part number against official manufacturer documentation to confirm the fixed 3.3V output configuration and DPAK package type. Ensure compatibility with required input voltage ranges and load currents before integration. Check for any updated revision history or environmental compliance data directly from the source datasheet.
Selection Notes
Select this component when a high-current (up to 3A) LDO with minimal voltage drop is required. The fixed 3.3V output eliminates external resistor networks needed for adjustable versions. Consider the DPAK package for thermal management and PCB space constraints. Verify that the application does not exceed the absolute maximum ratings for input voltage or junction temperature.
Part Context
This device belongs to the LD39300 series of ultra low drop BICMOS voltage regulators. The 'DT' suffix indicates the DPAK surface-mount package, while '33' specifies the fixed 3.3V output voltage. The '-R' suffix typically denotes tape and reel packaging. This series is designed for low voltage microprocessor and memory applications requiring fast dynamic response.
Replacement Considerations
Consult official STMicroelectronics documentation for verified substitute part numbers. Cross-reference pinouts, electrical characteristics, and thermal resistance values to ensure functional equivalence. Do not assume interchangeability without validating all critical parameters against the target application requirements.
