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Product Detailed Parameters
- Description：IC REG LIN 1.8V 300MA 4-FLIPCHIP
- 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)：1.8V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.3V @ 300mA
- Current - Output：300mA
- Current - Quiescent (Iq)：50 µA
- Current - Supply (Max)：85 µA
- PSRR：62dB (1kHz ~ 10kHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature, Soft Start
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：4-UFBGA, FCBGA
- Supplier Device Package：4-Flipchip (0.79x0.79)
- Grade：-
- Qualification：-
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Overview
The LD39030SJ18R is a fixed-output linear voltage regulator manufactured by STMicroelectronics, providing a stable 1.8V output with a maximum current capacity of 300mA. 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 exhibits very low quiescent current, typically 20µA at no load and 40µA at 300mA load, with shutdown consumption below 1µA. Power supply rejection ratio (PSRR) is typically 62dB between 1kHz and 10kHz. It includes internal soft-start, short-circuit protection, and thermal limiting, housed in a compact 4-flipchip package measuring 0.79x0.79mm.
Feature Summary
- Ultra-low quiescent current design optimized for battery-powered applications
- Low noise performance suitable for sensitive analog circuits
- Integrated enable logic control for efficient power management
- Built-in short-circuit constant current limiting and thermal protection
Applications
- Low power battery-operated electronic devices
- Portable sensor nodes requiring minimal standby current
- Noise-sensitive analog signal conditioning circuits
- Mobile connectivity modules and smart hubs
Procurement Notes
Verify component authenticity through authorized distributors as the part is obsolete. Confirm final assembly marks match official datasheet specifications. Check for moisture sensitivity level compliance during storage. Ensure replacement components meet identical electrical parameters if sourcing alternatives due to end-of-life status.
Selection Notes
Select this regulator for designs prioritizing ultra-low static current and small footprint over high PSRR at higher frequencies. Suitable for inputs up to 5.5V where space constraints limit larger packages. Consider the flip-chip packaging requirements for PCB layout. Evaluate thermal dissipation needs given the small package size under heavy loads.
Part Context
Part of the LD39030 family of low-dropout regulators designed for low-power applications. The SJ suffix indicates the flip-chip package variant. This series emphasizes energy efficiency and noise reduction for portable electronics. It complements other PMIC solutions in ST's portfolio for system-level power management.
Replacement Considerations
ADP172ACBZ-1.8-R7 by Analog Devices Inc. is a documented similar substitute. Verify pin compatibility and thermal characteristics when transitioning. Ensure output voltage tolerance and quiescent current specs meet original design requirements.
