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 Voltage (V) (nom)
Output Tolerance (typ)
Output Current (A) (nom)
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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

Country of Origin:

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

Country of Origin:

CHINA

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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:

CHINA

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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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ECCN (US):

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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ECCN (US):

EAR99

Country of Origin:

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LD2981ABM30TR SOT23-5L Tape And Reel 3 0.75 0.1
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0.262 10000
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ECCN (US):

EAR99

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LD2981ABM33TR SOT23-5L Tape And Reel 3.3 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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LD2981CU50TR SOT-89 Tape And Reel 5 0.75 0.1
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0.166 10000
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ECCN (US):

EAR99

Country of Origin:

CHINA

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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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Distributor availability ofLD2981CM50TR

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DIGIKEY WORLDWIDE 8460 1 Order Now
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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

Country of Origin:

CHINA

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Distributor availability ofLD2981CU33TR

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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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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9038 1 Order Now
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ARROW EUROPE 35000 0 Order Now
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MOUSER WORLDWIDE 11189 1 Order Now

Distributor reported inventory date: 2019-09-13

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DIGIKEY

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9038

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1

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1540

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1

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35000

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2500

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Stock

11189

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1

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Distributor reported inventory date: 2019-09-13

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

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 14815 1 Order Now
RS COMPONENTS EUROPE 16210 10 Order Now
FUTURE WORLDWIDE 24000 3000 Order Now
ARROW EUROPE 3000 0 Order Now
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Distributor reported inventory date: 2019-09-13

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DIGIKEY

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14815

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1

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16210

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10

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FUTURE

Stock

24000

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3000

Region

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Stock

3000

Min.Order

0

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Stock

9000

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3000

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Stock

18059

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Distributor reported inventory date: 2019-09-13

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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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1054 1 Order Now
RS COMPONENTS EUROPE 110 10 Order Now
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MOUSER WORLDWIDE 5530 1 Order Now
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110

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4

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Stock

5720

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Distributor reported inventory date: 2019-09-13

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 5784 1 Order Now
Farnell Element14 EUROPE 6000 1 Order Now

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1

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6000

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1

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Distributor reported inventory date: 2019-09-13

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 23111 1 Order Now
RS COMPONENTS EUROPE 880 10 Order Now
AVNET AMERICA 35000 0 Order Now
FUTURE WORLDWIDE 6995 1 Order Now
ARROW EUROPE 5000 0 Order Now
ARROW AMERICA 45000 2500 Order Now
MOUSER WORLDWIDE 5259 1 Order Now

Distributor reported inventory date: 2019-09-13

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DIGIKEY

Stock

23111

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

880

Min.Order

10

Region

EUROPE Order Now

AVNET

Stock

35000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

6995

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

45000

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

5259

Min.Order

1

Region

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Distributor reported inventory date: 2019-09-13

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

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3000 1 Order Now
RS COMPONENTS EUROPE 4610 1 Order Now
ARROW EUROPE 156000 0 Order Now
MOUSER WORLDWIDE 3967 1 Order Now
ANGLIA Live EUROPE 5 3000 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

3000

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

4610

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

156000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3967

Min.Order

1

Region

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ANGLIA Live

Stock

5

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

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 1796 1 Order Now
RS COMPONENTS EUROPE 900 1 Order Now
AVNET AMERICA 15000 0 Order Now
ARROW EUROPE 9000 0 Order Now
ARROW AMERICA 20 1 Order Now
MOUSER WORLDWIDE 3700 1 Order Now
Farnell Element14 EUROPE 4948 1 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

1796

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

900

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

15000

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

9000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

20

Min.Order

1

Region

AMERICA Order Now

MOUSER

Stock

3700

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

4948

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

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 5994 1 Order Now
RS COMPONENTS EUROPE 2560 5 Order Now
MOUSER WORLDWIDE 7242 1 Order Now
RUTRONIK EUROPE 137500 2500 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

5994

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2560

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

7242

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

137500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

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 8460 1 Order Now
RS COMPONENTS EUROPE 6850 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 4421 1 Order Now
Farnell Element14 EUROPE 5525 1 Order Now
RUTRONIK EUROPE 3000 3000 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

8460

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

6850

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

4421

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5525

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

3000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

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 14043 1 Order Now
RS COMPONENTS EUROPE 3425 1 Order Now
ARROW EUROPE 2500 0 Order Now
MOUSER WORLDWIDE 18647 1 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

14043

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3425

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

18647

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2019-09-13

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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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.