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Product Detailed Parameters
- Description：300 MA VERY LOW QUIESCENT CURREN
- Series：ECOPACK®
- 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)：0.33 V @ 300mA
- Current - Output：300mA
- Current - Quiescent (Iq)：40 µA
- Current - Supply (Max)：130 µA
- 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 LD39030DTPU12R is a fixed-output linear regulator IC from STMicroelectronics, providing a nominal output voltage of 1.2 V with a standard tolerance of ±2.0% at 25 °C. It supports a maximum output current of 300 mA and operates within an input voltage range of 1.5 V to 5.5 V. The device features a typical dropout voltage of 300 mV at full load and maintains high power supply rejection ratios of 80 dB at 1 kHz and 55 dB at 100 kHz. Quiescent current is typically 20 µA at no load, dropping to 0.03 µA in shutdown mode. It utilizes a DFN4 1x1 package and includes internal soft-start, constant current limiting, and thermal protection.
Feature Summary
- Logic-controlled electronic shutdown enables ultra-low standby current consumption below 0.1 µA.
- Integrated MOSFET automatically discharges the output capacitor when the enable pin is deactivated.
- Internal soft-start circuit limits inrush current during startup without requiring external components.
Applications
- Mobile phones
- Tablets
- Digital still cameras (DSC)
- Cordless phones and similar battery-powered systems
- Portable media players
Procurement Notes
Verify the specific ordering code against the manufacturer's official datasheet to confirm the presence of the auto-discharge feature and output voltage tolerance. Ensure compatibility with the required ceramic output capacitance for stability. Confirm that the DFN4 1x1 footprint matches the PCB design guidelines provided in the package information section.
Selection Notes
Select this component for applications requiring minimal space due to the compact DFN4 1x1 package. It is suitable for low-power battery-operated systems where low quiescent current and high PSRR are critical. Ensure the input voltage remains within the specified 1.5 V to 5.5 V range and that the load does not exceed the 300 mA guaranteed output current limit.
Part Context
This part belongs to the LD39030 series of 300 mA very low dropout linear regulators. The series offers various fixed output voltages ranging from 0.8 V to 5.0 V in 50 mV steps. The 'DT' suffix indicates the inclusion of the optional output discharge feature, while the 'PU' denotes the DFN4 1x1 package type.
Replacement Considerations
LD39030ADTPU12R provides the same functionality with tighter ±0.5% output voltage tolerance.
FAQ
Does the LD39030DTPU12R include an output discharge feature?
Yes, the 'DT' suffix in the part number confirms that this variant includes an integrated MOSFET for automatic output discharge when disabled.
What is the minimum recommended output capacitor for stability?
While the device is stable with a minimum effective capacitance of 220 nF, a minimum output capacitor of 0.47 µF is recommended to ensure stability across all operating conditions.
