LD2981   Product is in volume production.

Ultra low drop voltage regulators with inhibit low ESR output

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The LD2981 is a 100 mA fixed-output voltage regulator. The low-drop voltage and the ultra low quiescent current make them suitable for low noise, low power applications and in battery powered systems.

The quiescent current in sleep mode is less than 1 μA when INHIBIT pin is pulled low. Shutdown logic control function is available on pin n° 3 (TTL compatible). This means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. The LD2981 is designed to work with low ESR ceramic capacitor. Typical applications are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.

Key Features

  • Ultra low dropout voltage (0.17 V typ. at 100 mA load, 7 mV typ. at 1 mA load)
  • Very low quiescent current (80 μA typ. at no load in on mode; max 1 μA in off mode)
  • Guaranteed output current up to 100 mA
  • Logic-controlled electronic shutdown
  • Output voltage of 2.5; 3.0; 3.3; 5.0 V
  • Internal current and thermal limit
  • ± 0.75% tolerance output voltage available (A version)
  • Output low noise voltage 160 μVRMS
  • Temperature range: -40 to 125 °C
  • Small package SOT23-5L and SOT-89
  • Fast dynamic response to line and load changes

Resources

Technical Documentation

Product Specifications
Description Version Size
DS1528 DS1528: Ultra low-drop voltage regulators with inhibit 17.0 1 MB

Publications and Collaterals

Selection Guides
Description Version Size
Linear and Switching Voltage Regulators Selection Guide 3.0 370 KB
Brochures
Description Version Size
Brochure Power management guide 10.2018 4 MB
Low-dropout (LDO) linear voltage regulators - Quick Reference Guide 2.2 216 KB
Power management for handheld and portable 2.0 1 MB
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Sample & Buy

Part Number Package Packing Type Output Voltage (V) (nom) Output Tolerance (typ) Output Current (A) (nom) Marketing Status Unit Price (US$) * Quantity ECCN (US) Country of Origin More info Order from ST Order from Distributors
LD2981ABU50TR SOT-89 Tape And Reel 5 0.75 0.1 Active 0.209 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981CM33TR SOT23-5L Tape And Reel 3.3 0.75 0.1 Active 0.217 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981ABM50TR SOT23-5L Tape And Reel 5 0.75 0.1 Active 0.262 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981CM30TR SOT23-5L Tape And Reel 3 0.75 0.1 Active 0.217 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981ABU33TR SOT-89 Tape And Reel 3.3 0.75 0.1 Active 0.209 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981ABM30TR SOT23-5L Tape And Reel 3 0.75 0.1 Active 0.262 1000 EAR99 MALAYSIA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981ABM33TR SOT23-5L Tape And Reel 3.3 0.75 0.1 Active 0.262 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981CU50TR SOT-89 Tape And Reel 5 0.75 0.1 Active 0.166 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981CM50TR SOT23-5L Tape And Reel 5 0.75 0.1 Active 0.217 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
LD2981CU33TR SOT-89 Tape And Reel 3.3 0.75 0.1 Active 0.166 1000 EAR99 CHINA MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY
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(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LD2981ABU50TR ActiveSOT-89IndustrialEcopack2 0 0
LD2981CM33TR ActiveSOT23-5LIndustrialEcopack2 0 0
LD2981ABM50TR ActiveSOT23-5LIndustrialEcopack2 0 0
LD2981CM30TR ActiveSOT23-5LIndustrialEcopack2 0 0
LD2981ABU33TR ActiveSOT-89IndustrialEcopack2 0 0
LD2981ABM30TR ActiveSOT23-5LIndustrialEcopack2 0 0
LD2981ABM33TR ActiveSOT23-5LIndustrialEcopack2 0 0
LD2981CU50TR ActiveSOT-89IndustrialEcopack2 0 0
LD2981CM50TR ActiveSOT23-5LIndustrialEcopack2 0 0
LD2981CU33TR ActiveSOT-89IndustrialEcopack2 0 0
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(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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