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Product Detailed Parameters
- Description：IC REG LINEAR 1.2V 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)：1.2V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.33V @ 300mA (Typ)
- Current - Output：300mA
- Current - Quiescent (Iq)：40 µA
- Current - Supply (Max)：130 µA
- PSRR：80dB ~ 55dB (1kHz ~ 100kHz)
- Control Features：Enable, Soft Start
- Protection Features：Over Current, Over Temperature
- 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 LD39030ADTPU12R is a fixed-output low-dropout linear regulator from STMicroelectronics, providing a stable 1.2 V output with a maximum load current of 300 mA. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 300 mV at full load. The device exhibits a very low quiescent current of 20 µA (typical) and achieves high power supply rejection ratios of 80 dB at 1 kHz. It includes internal soft-start, constant current limiting, and thermal protection, housed in a compact DFN4 1x1 package.
Feature Summary
- Ultra-low dropout voltage operation ensures efficient power delivery across wide input ranges.
- Logic-controlled enable pin allows for deep shutdown mode with negligible standby current consumption.
- Internal soft-start circuit limits inrush current during power-up sequences.
- Integrated constant current and thermal protection safeguards against overload conditions.
Applications
- Low-power battery-operated portable electronics
- RF modules requiring low-noise power supplies
- Embedded systems with strict space constraints
Procurement Notes
Verify the specific suffix 'A' indicates the ±0.5% output voltage tolerance variant compared to standard versions. Confirm the 'DTPU' designation corresponds to the 4-DFN 1x1 package with exposed pad. Ensure compatibility with ceramic output capacitors as specified in the official datasheet for stability.
Selection Notes
Select this component when precise voltage regulation is critical due to its tight tolerance specification. Consider the DFN4 footprint for applications where board real estate is limited. Evaluate the 300 mA current capability against peak load requirements to ensure adequate headroom for system performance.
Part Context
This part belongs to the LD39030 family of ultra-low quiescent current linear regulators designed for space-saving and energy-efficient applications. The series offers various fixed output voltages and packages, with the ADTPU variant specifically optimized for high accuracy and compact surface-mount integration.
Replacement Considerations
Direct substitutes include other LD39030 variants with different output voltages or tolerances, such as LD39030DTPU12R. Cross-referencing pinouts and thermal characteristics is essential when replacing with non-ST LDOs.
