LD3985

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Ultra low drop-low noise BiCMOS voltage regulators low ESR capacitors compatible

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  • The LD3985 provides up to 150 mA, from 2.5 V to 6 V input voltage. The ultra low drop voltage, low quiescent current and low noise make it suitable for low power applications and in battery-powered systems. Regulator ground current increases slightly in dropout only, prolonging the battery life. Power supply rejection is better than 60 dB at low frequencies and rolls off at 10 kHz. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits. Shutdown logic control function is available, 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 LD3985 is designed to work with low ESR ceramic capacitors. Typical applications are in mobile phones and similar battery-powered wireless systems.

    Key Features

    • Input voltage from 2.5 to 6 V
    • Stable with low ESR ceramic capacitors
    • Ultra low-dropout voltage (60 mV typ. at 150 mA load, 0.4 mV typ. at1 mA load)
    • Very low quiescent current (85 μA typ. at no load, 170 μA typ. at 150 mA load; max.1.5 μA in OFF mode)
    • Guaranteed output current up to 150 mA
    • Wide range of output voltages: 1.22 V; 1.8 V; 2.5 V; 2.7 V; 2.8 V;2.9 V; 3.3 V; 4.7 V
    • Fast turn-on time: typ. 200 μs [CO = 1 μF, CBYP = 10 nF and IO = 1 mA]
    • Logic-controlled electronic shutdown
    • Internal current and thermal limit
    • Output low noise voltage 30 μVRMS over 10 Hz to 100 kHz
    • SVR of 60 dB at 1 kHz, 50 dB at 10 kHz
    • Temperature range: -40 °C to 125 °C

Sample & Buy

Part Number
Package
Packing Type
Output Voltage (V) (nom)
Output Tolerance (typ)
Output Current (A) (nom)
Marketing Status
ECCN (US)
Country of Origin
Budgetary Price (US$)*/Qty
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LD3985M47R SOT23-5L Tape And Reel 4.7 2 0.15
Active
EAR99 MALAYSIA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5630 1 Order Now
MOUSER WORLDWIDE 3196 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

5630

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3196

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M25R SOT23-5L Tape And Reel 2.5 2 0.15
Active
EAR99 CHINA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6081 1 Order Now
RS COMPONENTS EUROPE 1990 5 Order Now
MOUSER WORLDWIDE 6506 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

6081

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1990

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6506

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M33R SOT23-5L Tape And Reel 3.3 2 0.15
Active
EAR99 CHINA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2629 1 Order Now
COMPEL EUROPE 7915 1 Order Now
RS COMPONENTS EUROPE 1905 5 Order Now
AVNET AMERICA 6000 0 Order Now
FUTURE WORLDWIDE 6695 1 Order Now
MOUSER WORLDWIDE 4232 1 Order Now
Farnell Element14 EUROPE 1763 1 Order Now
RUTRONIK EUROPE 6000 3000 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

2629

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

7915

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1905

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

6695

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4232

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1763

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

6000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M122R SOT23-5L Tape And Reel 1.22 2 0.15
Active
EAR99 MALAYSIA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5118 1 Order Now
COMPEL EUROPE 9069 1 Order Now
MOUSER WORLDWIDE 5539 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

5118

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

9069

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5539

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M18R SOT23-5L Tape And Reel 1.8 2 0.15
Active
EAR99 MALAYSIA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3230 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 2200 1 Order Now
MOUSER WORLDWIDE 7549 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

3230

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2200

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

7549

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M30R SOT23-5L Tape And Reel 3 2 0.15
Active
EAR99 MALAYSIA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6585 1 Order Now
RS COMPONENTS EUROPE 2350 1 Order Now
MOUSER WORLDWIDE 8793 1 Order Now
Farnell Element14 EUROPE 5208 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

6585

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2350

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

8793

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5208

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M27R SOT23-5L Tape And Reel 2.7 2 0.15
Active
EAR99 MALAYSIA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7109 1 Order Now
MOUSER WORLDWIDE 6000 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

7109

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

6000

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M29R SOT23-5L Tape And Reel 2.9 2 0.15
Active
EAR99 MALAYSIA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 905 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

RS COMPONENTS

Stock

905

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M28R SOT23-5L Tape And Reel 2.8 2 0.15
Active
EAR99 MALAYSIA 0.192 / 1k Buy now Check Availability

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5995 1 Order Now
RS COMPONENTS EUROPE 1150 5 Order Now
MOUSER WORLDWIDE 6739 1 Order Now
Farnell Element14 EUROPE 5980 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

5995

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1150

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6739

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5980

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-26

LD3985M47R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5630 1 Order Now
MOUSER WORLDWIDE 3196 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

5630

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

3196

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

4.7

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M25R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6081 1 Order Now
RS COMPONENTS EUROPE 1990 5 Order Now
MOUSER WORLDWIDE 6506 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

6081

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1990

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6506

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD3985M33R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2629 1 Order Now
COMPEL EUROPE 7915 1 Order Now
RS COMPONENTS EUROPE 1905 5 Order Now
AVNET AMERICA 6000 0 Order Now
FUTURE WORLDWIDE 6695 1 Order Now
MOUSER WORLDWIDE 4232 1 Order Now
Farnell Element14 EUROPE 1763 1 Order Now
RUTRONIK EUROPE 6000 3000 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

2629

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

7915

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

1905

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

6695

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4232

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1763

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

6000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LD3985M122R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5118 1 Order Now
COMPEL EUROPE 9069 1 Order Now
MOUSER WORLDWIDE 5539 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

5118

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

9069

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5539

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

1.22

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M18R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3230 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 2200 1 Order Now
MOUSER WORLDWIDE 7549 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

3230

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2200

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

7549

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

1.8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M30R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6585 1 Order Now
RS COMPONENTS EUROPE 2350 1 Order Now
MOUSER WORLDWIDE 8793 1 Order Now
Farnell Element14 EUROPE 5208 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

6585

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2350

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

8793

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5208

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M27R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7109 1 Order Now
MOUSER WORLDWIDE 6000 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

7109

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

6000

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

2.7

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M29R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 905 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

RS COMPONENTS

Stock

905

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

2.9

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M28R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5995 1 Order Now
RS COMPONENTS EUROPE 1150 5 Order Now
MOUSER WORLDWIDE 6739 1 Order Now
Farnell Element14 EUROPE 5980 1 Order Now

Distributor reported inventory date: 2020-05-26

Distributor Name

DIGIKEY

Stock

5995

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1150

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6739

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5980

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-05-26

Output Voltage (V) (nom)

2.8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.192 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) 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
      DS3355
      Ultra low drop and low noise BiCMOS voltage regulators
      17.0
      423.92 KB
      PDF
      DS3355

      Ultra low drop and low noise BiCMOS voltage regulators

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 2.1
      1.78 MB
      PDF
      Power management for handheld and portable 2.0
      1.09 MB
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      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**
LD3985M122R
Active
SOT23-5L Industrial Ecopack2
LD3985M18R
Active
SOT23-5L Industrial Ecopack2
LD3985M25R
Active
SOT23-5L Industrial Ecopack2
LD3985M27R
Active
SOT23-5L Industrial Ecopack2
LD3985M28R
Active
SOT23-5L Industrial Ecopack2
LD3985M29R
Active
SOT23-5L Industrial Ecopack2
LD3985M30R
Active
SOT23-5L Industrial Ecopack2
LD3985M33R
Active
SOT23-5L Industrial Ecopack2
LD3985M47R
Active
SOT23-5L Industrial Ecopack2

LD3985M122R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M18R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M25R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M27R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M28R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M29R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M30R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M33R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LD3985M47R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

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.