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Product Detailed Parameters
- Description：IC REG LINEAR 3.3V 1A 6-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)：3.3V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.4V @ 1A
- Current - Output：1A
- Current - Quiescent (Iq)：50 µA
- Current - Supply (Max)：300 µA
- PSRR：65dB ~ 62dB (1kHz ~ 10kHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C (TJ)
- Mounting Type：Surface Mount, Wettable Flank
- Package / Case：6-VDFN Exposed Pad
- Supplier Device Package：6-DFN (3x3)
- Grade：Automotive
- Qualification：AEC-Q100
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Overview
The LD49100PU33RY is a fixed-output low-dropout linear regulator manufactured by STMicroelectronics, providing a stable 3.3 V output with a maximum current capacity of 1 A. It operates within an input voltage range of 1.5 V to 5.5 V and features a typical dropout voltage of 200 mV at full load. The device is qualified under the AEC-Q100 Grade 1 standard for automotive reliability and functions across a temperature range of -40 °C to +125 °C. It utilizes a compact DFN6 (3x3 mm) package with wettable flanks and includes internal protections such as thermal shutdown and short-circuit current limiting.
Feature Summary
- AEC-Q100 Grade 1 qualified for automotive applications
- Ultra-low quiescent current with logic-controlled electronic shutdown
- Low-noise performance without requiring external bypass capacitors
- Integrated Power Good indicator for system monitoring
Applications
- Infotainment systems
- Advanced Driver Assistance Systems (ADAS)
- Telematics units
- Body electronics
Procurement Notes
Verify that the specific part number matches the required fixed 3.3 V output configuration. Confirm the presence of the 'R' suffix indicates reel packaging if tape-and-reel handling is necessary. Ensure the DFN6 package variant with wettable flanks aligns with PCB footprint specifications. Check for RoHS compliance documentation corresponding to the manufacturing batch.
Selection Notes
Select this component when a high-current 3.3 V rail is needed in space-constrained automotive designs. The low dropout characteristic supports operation from single-cell lithium batteries or fluctuating vehicle power lines. The integrated soft-start minimizes inrush currents during system initialization. Consider the thermal resistance characteristics for heat dissipation requirements on the target PCB layout.
Part Context
This regulator belongs to the LD49100 family, which offers various fixed and adjustable output voltages ranging from 0.8 V to 4.5 V. All variants share the same 1 A current capability and automotive-grade qualification. The family is designed to provide consistent performance across different voltage rails while maintaining low noise and high efficiency in power management circuits.
Replacement Considerations
Direct substitutes include other LD49100 series variants with different fixed output voltages, such as LD49100PU18RY or LD49100PU25RY, provided the voltage requirement differs. Adjustable versions like LD49100PURY can replace fixed outputs if external resistor dividers are implemented.
