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Product Detailed Parameters
- Description：IC REG LINEAR 2.1V 200MA 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)：2.1V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.35V @ 200mA
- Current - Output：200mA
- 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 LD39020ADTPU21R is a fixed-output linear regulator IC from STMicroelectronics, providing a stable 2.1V output with a maximum current of 200mA. It operates within an input voltage range of 1.5V to 5.5V and features a typical dropout voltage of 200mV at full load. The device incorporates a very low quiescent current of 40µA and high power supply rejection ratio (PSRR) of 80dB at 1kHz. Packaged in a compact 4-DFN (1x1mm) surface-mount format, it includes internal soft-start, overcurrent protection, and thermal shutdown capabilities.
Feature Summary
- Ultra-low dropout voltage operation ensures efficient power delivery under varying load conditions.
- Logic-controlled enable function allows for precise electronic shutdown with minimal standby consumption.
- Integrated soft-start circuit limits inrush current during power-up sequences.
- Built-in thermal and constant current protection safeguards the device against fault conditions.
Applications
- Low-power battery-operated portable electronics
- Smartphones and wearable devices requiring space-efficient power management
- Tablets and handheld equipment utilizing ceramic capacitor stabilization
Procurement Notes
Verify the specific suffix 'A' indicates the ±0.5% output voltage tolerance version rather than the standard ±2.0% variant. Confirm the 'DTPU' package designation matches the required 4-DFN 1x1mm footprint with exposed pad. Ensure compatibility with the recommended 0.47µF ceramic output capacitor for stability. Check RoHS compliance status for your region's regulatory requirements before finalizing procurement.
Selection Notes
Select this component when a fixed 2.1V rail is required with strict space constraints due to its 1x1mm DFN package. Choose this part if system design demands ultra-low quiescent current to extend battery life in idle modes. Consider this regulator for applications needing high PSRR to suppress noise from upstream power sources. Verify that the input voltage remains within the 1.5V to 5.5V range for proper regulation.
Part Context
This part belongs to the LD39020 family of high-accuracy linear regulators designed for mobile and portable applications. The family offers various fixed output voltages ranging from 0.8V to 5.0V in 50mV steps. The LD39020 series is characterized by its ability to stabilize using small ceramic capacitors, reducing overall bill of materials and board area compared to older LDO technologies requiring tantalum or electrolytic outputs.
Replacement Considerations
LD39020DTPU21R: Standard version with ±2.0% output voltage tolerance instead of ±0.5%. LD39020ADTPU18R: Same A-version accuracy but provides a 1.8V fixed output. LD39020ADTPU30R: Same A-version accuracy but provides a 3.0V fixed output. All substitutes maintain identical pinout, package, and protection features.
