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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 3A PPAK
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- 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-252-5, DPAK (4 Leads + Tab), TO-252AD
- Supplier Device Package：PPAK
- Grade：-
- Qualification：-
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Overview
The LD39300PT33-R is a fixed-output ultra-low dropout linear regulator manufactured by STMicroelectronics. It provides a guaranteed output current of 3A with an output voltage of 3.3V. The device operates from an input supply ranging from 2.5V to 6V and features a typical dropout voltage of 200mV at full load. Quiescent current is typically 1.2mA during operation and drops to 1µA maximum in off mode. It includes logic-controlled electronic shutdown, internal current limiting, and thermal protection. The component is available in PPAK and DPAK packages and functions within a temperature range of -40°C to +125°C.
Feature Summary
- Ultra-low dropout voltage performance for efficient power regulation
- Logic-controlled electronic shutdown capability for low standby consumption
- Internal short-circuit and thermal protection mechanisms
- Stable operation with ceramic output capacitors
Applications
- Microprocessor power supplies
- DSPs power supply
- Post regulators for switching suppliers
- High efficiency linear regulator
Procurement Notes
Verify the specific package type (PPAK or DPAK) required for your design, as both are supported by the LD39300 family. Confirm that the fixed 3.3V output aligns with system requirements, as adjustable versions exist under different part numbers. Ensure external input and output capacitors meet minimum capacitance and ESR specifications to maintain stability. Check for RoHS compliance status if environmental regulations apply to your manufacturing process.
Selection Notes
Select this component when high output current up to 3A is needed with minimal voltage drop. The fixed 3.3V output eliminates the need for external feedback resistors used in adjustable variants. Consider the PPAK or DPAK package based on thermal dissipation needs and PCB space constraints. Verify that the input voltage remains within the 2.5V to 6V operating range for proper regulation.
Part Context
The LD39300 series belongs to STMicroelectronics' line of ultra-low dropout BICMOS voltage regulators. Developed using a BiCMOS process, it allows low quiescent current operation independent of output load current. This series is designed for low-voltage microprocessor and memory applications where fast dynamic response and low noise are critical. The PT suffix indicates a specific package variant within the broader LD39300 product family.
Replacement Considerations
LD39300DT33-R: Fixed 3.3V output in DPAK package.
FAQ
What is the function of the Inhibit pin?
The Inhibit pin controls the ON/OFF state of the regulator. Pulling it below 0.3V turns the device off, reducing current consumption to less than 1µA. It must not be left floating.
Is the LD39300 stable with ceramic capacitors?
Yes, the device is stable with ceramic output capacitors, provided they meet the minimum capacitance and ESR requirements specified in the datasheet.
