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Product Detailed Parameters
- Description：IC REG LINEAR 1.05V 300MA 4-DFN
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR),Cut Tape (CT)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：5.5V
- Voltage - Output (Min/Fixed)：1.05V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.33V @ 300mA
- Current - Output：300mA
- Current - Quiescent (Iq)：40 µA
- Current - Supply (Max)：-
- PSRR：80dB ~ 55dB (1kHz ~ 100kHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature, Soft Start
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount
- Package / Case：4-XDFN Exposed Pad
- Supplier Device Package：4-DFN (1x1)
- Grade：-
- Qualification：-
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Overview
The LD39030DTPU105R is a fixed-output low-dropout linear regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 1.05V with a maximum continuous output current of 300mA. The device operates from an input voltage range of 1.5V to 5.5V and features a typical dropout voltage of 300mV at full load. Quiescent current is specified at 40µA, with power supply rejection ratio (PSRR) values of 80dB at 1kHz and 55dB at 100kHz. It utilizes a 4-DFN (1x1mm) surface-mount package.
Feature Summary
- Ultra-low quiescent current consumption for extended battery life in portable applications
- High power supply rejection ratio to minimize noise on sensitive analog circuits
- Integrated enable logic control for efficient system power management
- Internal soft-start circuitry limits inrush current during startup
Applications
- Battery-powered portable electronic devices requiring stable low-voltage rails
- RF modules and sensors needing low-noise power supplies
- Embedded systems utilizing ceramic output capacitors
- Space-constrained designs compatible with DFN4 1x1 packages
Procurement Notes
Verify the specific suffix '105' confirms the 1.05V fixed output voltage variant. Confirm the 'DTPU' designation matches the required 4-DFN 1x1mm package type. Ensure the trailing 'R' indicates tape-and-reel packaging if automated assembly is planned. Check RoHS compliance status against current manufacturing updates.
Selection Notes
Select this component when a precise 1.05V rail is required with minimal static power draw. The 300mA current capability suits moderate load applications. Verify that the input voltage remains within the 1.5V to 5.5V operational window. Consider the thermal performance in the small DFN package under high ambient temperatures.
Part Context
This part belongs to the LD39030 series of ultra-low quiescent current LDO regulators. The series offers various fixed output voltages ranging from 0.8V to 5.0V in 50mV steps. All variants share similar electrical characteristics, including 300mA output current and low dropout voltage, packaged in the compact DFN4 1x1 format.
Replacement Considerations
LD39030DTPU125R: Provides 1.25V output with identical package and electrical profile. LD39030DTPU150R: Offers 1.5V output while maintaining the same 300mA current rating and DFN4 footprint.
