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Product Detailed Parameters
- Description：IC REG LINEAR 3.2V 250MA 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)：3.2V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.25V @ 250mA
- Current - Output：250mA
- Current - Quiescent (Iq)：25 µA
- Current - Supply (Max)：425 µA
- PSRR：80dB ~ 60dB (100Hz ~ 100KHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature, Short Circuit, 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 LDLN025PU32R is a fixed-output linear low-dropout regulator from STMicroelectronics, providing a stable 3.2V output with a maximum current capacity of 250mA. It operates within an input voltage range of 1.5V to 5.5V and features a typical dropout voltage of 120mV at full load. The device exhibits ultra-low quiescent current of 12µA and high power supply rejection ratios of 80dB at 100Hz and 60dB at 100kHz. Designed for noise-sensitive applications, it delivers an output noise as low as 6.5µVRMS. The component includes internal soft-start, overcurrent protection, thermal shutdown, and logic-controlled enable functionality.
Feature Summary
- Ultra-low noise performance suitable for precision analog loads
- High power supply rejection ratio for clean signal integrity
- Logic-controlled enable pin for efficient power management
- Integrated protection against overcurrent, thermal overload, and short circuits
Applications
- Powering voltage-controlled oscillators in mobile devices
- Supplying precision analog-to-digital converters
- Powering sensors in wireless IoT devices
- Voltage regulation for fitness monitors and medical sensors
Procurement Notes
Verify the specific suffix 'PU32R' to confirm the 3.2V fixed output voltage variant. Ensure compatibility with the 4-DFN (1x1) package footprint during PCB layout. Confirm RoHS3 compliance requirements if applicable to your manufacturing standards. Cross-reference the manufacturer part number with distributor codes to avoid ordering errors related to different output voltages within the same series.
Selection Notes
Select this component when a fixed 3.2V rail is required with minimal board space due to the compact 4-DFN package. It is appropriate for battery-operated systems requiring extended standby life due to its 12µA quiescent current. Choose this over adjustable regulators when system stability and reduced external component count are priorities. Ensure the input voltage remains within the 1.5V to 5.5V range for optimal operation.
Part Context
This part belongs to the LDLN025 series of ultra-low-noise LDO regulators designed for space-constrained and noise-sensitive applications. The series offers various fixed output voltages ranging from 1V to 5V in 50mV steps. It shares common family features such as flip-chip and DFN packaging options, making it suitable for smartphones, smartwatches, and wireless LAN equipment where low noise and small form factor are critical.
Replacement Considerations
Other variants within the LDLN025 series, such as LDLN025PU25R or LDLN025PU12R, share identical pinouts and electrical characteristics except for the fixed output voltage. Verify that the target application can tolerate the alternative voltage level before substitution.
