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Product Detailed Parameters
- Description：IC REG LINEAR 1.22V 3A DPAK
- Series：-
- Mfr：STMicroelectronics
- Package：Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：6V
- Voltage - Output (Min/Fixed)：1.22V
- 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 LD39300DT12-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 1.22V. The device operates from an input supply ranging from 2.5V to 6V and features very low quiescent current, dropping to 1µA maximum in off mode. It utilizes a BiCMOS process for efficient operation across the -40°C to 125°C temperature range.
Feature Summary
- Ultra-low dropout voltage performance under heavy load conditions
- Logic-controlled electronic shutdown capability for power management
- Internal current and thermal limit protection mechanisms
- Stable operation when used with ceramic output capacitors
Applications
- Microprocessor power supply
- DSPs power supply
- Post regulators for switching supplies
- High efficiency linear regulator
Procurement Notes
Verify component authenticity through authorized channels. Confirm package integrity upon receipt. Ensure proper ESD handling during storage and installation. Check datasheet specifications against design requirements before integration.
Selection Notes
Evaluate input-to-output voltage differential to ensure dropout limits are met at peak load currents. Verify that external capacitor values and equivalent series resistance fall within the stability region defined in the datasheet. Consider thermal dissipation capabilities based on ambient operating conditions.
Part Context
This component belongs to the LD39300 family of ultra-low drop BICMOS voltage regulators. The DT suffix indicates DPAK packaging. Other variants in this series offer different fixed output voltages or adjustable configurations, sharing similar electrical characteristics and pinouts.
Replacement Considerations
LD39300DT18-R
FAQ
What is the minimum required capacitance for stable operation?
A minimum output capacitance of 4.7µF is recommended to guarantee regulator stability.
How does the inhibit pin function?
Pulling the inhibit pin below 0.3V turns the regulator off, reducing current consumption to less than 1µA. It must not be left floating.
