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Product Detailed Parameters
- Description：IC REG LINEAR 3.5V 50MA SOT23-5
- Series：-
- Mfr：STMicroelectronics
- Package：Tape & Reel (TR)
- Output Configuration：Positive
- Output Type：Fixed
- Number of Regulators：1
- Voltage - Input (Max)：16V
- Voltage - Output (Min/Fixed)：3.5V
- Voltage - Output (Max)：-
- Voltage Dropout (Max)：0.225V @ 50mA
- Current - Output：50mA
- Current - Quiescent (Iq)：150 µA
- Current - Supply (Max)：1.2 mA
- PSRR：45dB (1kHz)
- Control Features：Enable
- Protection Features：Over Current, Over Temperature
- Operating Temperature：-40°C ~ 125°C
- Mounting Type：Surface Mount
- Package / Case：SC-74A, SOT-753
- Supplier Device Package：SOT-23-5
- Grade：-
- Qualification：-
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Overview
The LD2982AM35R is a fixed-output ultra-low dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 3.5 V output with a maximum guaranteed load current of 50 mA. The device features an ultra-low quiescent current of 80 μA in active mode and less than 1 μA in shutdown mode when the inhibit pin is pulled low. It is designed for stability with low ESR ceramic capacitors, offering an output noise voltage of 160 μVRMS. The component operates within a temperature range of -40 °C to 125 °C and includes internal thermal and current limiting protections.
Feature Summary
- Ultra-low dropout voltage performance suitable for battery-powered systems
- Logic-controlled electronic shutdown via TTL-compatible inhibit pin
- Stable operation with low ESR ceramic output capacitors
- Low output noise voltage for sensitive analog applications
Applications
- Battery-powered instrumentation systems
- Audio system power supplies
- Industrial control boards
- Switching mode power supply (SMPS) post-regulation
Procurement Notes
Verify the specific suffix 'M35R' corresponds to the 3.5 V fixed output variant and SOT23-5L package configuration. Confirm that the manufacturer datasheet explicitly lists this part number as an active product. Ensure compatibility with low ESR ceramic capacitors as required for stability. Check for any specific ordering suffixes that may alter pinout or electrical characteristics compared to standard variants.
Selection Notes
Select this component when a precise 3.5 V rail is required with minimal quiescent current consumption. It is appropriate for designs prioritizing low noise and small footprint using SOT23-5L packaging. Consider the 50 mA current limit for load requirements. Verify input voltage headroom against the dropout characteristics to ensure regulation under all operating conditions.
Part Context
This regulator belongs to the LD2980 series of ultra-low dropout voltage regulators from STMicroelectronics. The series is characterized by low quiescent current and stability with ceramic capacitors. Variants within the family typically offer different fixed output voltages while sharing similar protection features and package options. This specific model targets low-power portable and industrial applications requiring efficient linear regulation.
Replacement Considerations
Cross-reference with other LD2980 series variants for different voltage outputs if 3.5 V is not strictly required. Verify pin-to-pin compatibility with alternative LDOs offering similar 50 mA current ratings and SOT23-5L packages. Ensure substitute components maintain stability with low ESR ceramic capacitors and meet the same thermal and current limiting specifications.
