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

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Output Tolerance (typ)
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LD2981ABU50TR SOT-89 Tape And Reel 5 0.75 0.1
Active
0.209 10000
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ECCN (US):

EAR99

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CHINA

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LD2981CM33TR SOT23-5L Tape And Reel 3.3 0.75 0.1
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0.217 10000
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ECCN (US):

EAR99

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LD2981ABM50TR SOT23-5L Tape And Reel 5 0.75 0.1
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0.262 10000
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ECCN (US):

EAR99

Country of Origin:

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LD2981CM30TR SOT23-5L Tape And Reel 3 0.75 0.1
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0.217 10000
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EAR99

Country of Origin:

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LD2981ABU33TR SOT-89 Tape And Reel 3.3 0.75 0.1
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0.209 10000
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EAR99

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LD2981ABM30TR SOT23-5L Tape And Reel 3 0.75 0.1
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LD2981ABM33TR SOT23-5L Tape And Reel 3.3 0.75 0.1
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LD2981CU50TR SOT-89 Tape And Reel 5 0.75 0.1
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0.166 10000
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EAR99

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LD2981CM50TR SOT23-5L Tape And Reel 5 0.75 0.1
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0.217 10000
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ECCN (US):

EAR99

Country of Origin:

CHINA

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LD2981CU33TR SOT-89 Tape And Reel 3.3 0.75 0.1
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0.166 10000
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ECCN (US):

EAR99

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LD2981ABU50TR

Package

SOT-89

Packing Type

Tape And Reel

Unit Price (US$)

0.209*

Distributor availability ofLD2981ABU50TR

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DIGIKEY WORLDWIDE 5555 1 Order Now
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Stock

10314

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Distributor reported inventory date: 2019-12-10

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.209

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM33TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.217*

Distributor availability ofLD2981CM33TR

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DIGIKEY WORLDWIDE 14594 1 Order Now
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24970

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24000

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3000

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6000

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Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.217

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981ABM50TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.262*

Distributor availability ofLD2981ABM50TR

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Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.262

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM30TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.217*

Distributor availability ofLD2981CM30TR

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MOUSER WORLDWIDE 5654 1 Order Now
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5510

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Distributor reported inventory date: 2019-12-10

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.217

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD2981ABU33TR

Package

SOT-89

Packing Type

Tape And Reel

Unit Price (US$)

0.209*

Distributor availability ofLD2981ABU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 22648 1 Order Now
RS COMPONENTS EUROPE 310 10 Order Now
AVNET AMERICA 32500 0 Order Now
FUTURE WORLDWIDE 4241 1 Order Now
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MOUSER WORLDWIDE 9446 1 Order Now

Distributor reported inventory date: 2019-12-10

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Stock

22648

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1

Region

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Stock

310

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10

Region

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AVNET

Stock

32500

Min.Order

0

Region

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FUTURE

Stock

4241

Min.Order

1

Region

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Stock

50000

Min.Order

0

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Stock

9446

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1

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Distributor reported inventory date: 2019-12-10

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.209

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981ABM30TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.262*

Distributor availability ofLD2981ABM30TR

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DIGIKEY WORLDWIDE 3000 1 Order Now
RS COMPONENTS EUROPE 4500 1 Order Now
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ANGLIA Live EUROPE 5 3000 Order Now

Distributor reported inventory date: 2019-12-10

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DIGIKEY

Stock

3000

Min.Order

1

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Stock

4500

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1

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ARROW

Stock

156000

Min.Order

0

Region

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Stock

3957

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1

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5

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3000

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Distributor reported inventory date: 2019-12-10

Output Voltage (V) (nom)

3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.262

Quantity

10000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD2981ABM33TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.262*

Distributor availability ofLD2981ABM33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1598 1 Order Now
RS COMPONENTS EUROPE 790 1 Order Now
AVNET AMERICA 15000 0 Order Now
ARROW EUROPE 3000 0 Order Now
ARROW AMERICA 20 1 Order Now
MOUSER WORLDWIDE 3305 1 Order Now
Farnell Element14 EUROPE 4928 1 Order Now

Distributor reported inventory date: 2019-12-10

Distributor Name

DIGIKEY

Stock

1598

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

790

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

15000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

20

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

3305

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4928

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-10

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.262

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CU50TR

Package

SOT-89

Packing Type

Tape And Reel

Unit Price (US$)

0.166*

Distributor availability ofLD2981CU50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7083 1 Order Now
RS COMPONENTS EUROPE 2450 5 Order Now
ARROW EUROPE 17500 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 7008 1 Order Now
RUTRONIK EUROPE 47500 2500 Order Now

Distributor reported inventory date: 2019-12-10

Distributor Name

DIGIKEY

Stock

7083

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2450

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

17500

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

7008

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

47500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-10

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.166

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CM50TR

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.217*

Distributor availability ofLD2981CM50TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2439 1 Order Now
RS COMPONENTS EUROPE 4530 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 4321 1 Order Now
Farnell Element14 EUROPE 5670 1 Order Now
RUTRONIK EUROPE 21000 3000 Order Now

Distributor reported inventory date: 2019-12-10

Distributor Name

DIGIKEY

Stock

2439

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4530

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4321

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5670

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

21000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2019-12-10

Output Voltage (V) (nom)

5

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.217

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

LD2981CU33TR

Package

SOT-89

Packing Type

Tape And Reel

Unit Price (US$)

0.166*

Distributor availability ofLD2981CU33TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 11301 1 Order Now
RS COMPONENTS EUROPE 3330 1 Order Now
FUTURE WORLDWIDE 2500 2500 Order Now
ARROW EUROPE 7500 0 Order Now
MOUSER WORLDWIDE 18607 1 Order Now

Distributor reported inventory date: 2019-12-10

Distributor Name

DIGIKEY

Stock

11301

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3330

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

2500

Min.Order

2500

Region

WORLDWIDE Order Now

ARROW

Stock

7500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

18607

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-12-10

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

0.75

Output Current (A) (nom)

0.1

Marketing Status

Active

Unit Price (US$)

0.166

Quantity

10000

ECCN (US)

EAR99

Country of Origin

CHINA

(*) 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

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS1528
      Ultra low-drop voltage regulators with inhibit
      17.0
      1 MB
      PDF
      DS1528

      Ultra low-drop voltage regulators with inhibit

Publications and Collaterals

    • Description Version Size Action
      Linear and Switching Voltage Regulators Selection Guide 3.0
      370.88 KB
      PDF

      Linear and Switching Voltage Regulators Selection Guide

    • Description Version Size Action
      Low-dropout (LDO) linear voltage regulators - Quick Reference Guide 2.0
      216.23 KB
      PDF
      Power management for handheld and portable 2.0
      1.09 MB
      PDF

      Low-dropout (LDO) linear voltage regulators - Quick Reference Guide

      Power management for handheld and portable

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LD2981ABM30TR
Active
SOT23-5L Industrial Ecopack2
LD2981ABM33TR
Active
SOT23-5L Industrial Ecopack2
LD2981ABM50TR
Active
SOT23-5L Industrial Ecopack2
LD2981ABU33TR
Active
SOT-89 Industrial Ecopack2
LD2981ABU50TR
Active
SOT-89 Industrial Ecopack2
LD2981CM30TR
Active
SOT23-5L Industrial Ecopack2
LD2981CM33TR
Active
SOT23-5L Industrial Ecopack2
LD2981CM50TR
Active
SOT23-5L Industrial Ecopack2
LD2981CU33TR
Active
SOT-89 Industrial Ecopack2
LD2981CU50TR
Active
SOT-89 Industrial Ecopack2

LD2981ABM30TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981ABM33TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981ABM50TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981ABU33TR

Package:

SOT-89

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT-89

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981ABU50TR

Package:

SOT-89

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT-89

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CM30TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CM33TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CM50TR

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CU33TR

Package:

SOT-89

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT-89

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD2981CU50TR

Package:

SOT-89

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT-89

Grade

Industrial

RoHS Compliance Grade

Ecopack2

(**) 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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