LD3985

Active

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

Download datasheet

Order from our eStore and our distributors

Buy now
Overview
Tools & Software
Resources
Solutions
Quality & Reliability
Sales Briefcase
eDesignSuite
Get Started
Sample & Buy
Partner products
  • 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
Budgetary Price (US$)*
Quantity
More info
Order from Distributors
Order from ST
LD3985M47R SOT23-5L Tape And Reel 4.7 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5645 1 Order Now
MOUSER WORLDWIDE 6243 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

5645

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

6243

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Buy now
LD3985M25R SOT23-5L Tape And Reel 2.5 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6086 1 Order Now
COMPEL EUROPE 117 1 Order Now
RS COMPONENTS EUROPE 2180 5 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 6554 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

6086

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

117

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2180

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6554

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Buy now
LD3985M33R SOT23-5L Tape And Reel 3.3 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

CHINA

Check Availability

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5767 1 Order Now
RS COMPONENTS EUROPE 2385 5 Order Now
AVNET AMERICA 9000 0 Order Now
FUTURE WORLDWIDE 695 1 Order Now
MOUSER WORLDWIDE 6222 1 Order Now
Farnell Element14 EUROPE 1768 1 Order Now
RUTRONIK EUROPE 9000 3000 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

5767

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2385

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

9000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

695

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

6222

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1768

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

9000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Buy now
LD3985M122R SOT23-5L Tape And Reel 1.22 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5128 1 Order Now
COMPEL EUROPE 9072 1 Order Now
MOUSER WORLDWIDE 5539 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

5128

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

9072

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5539

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Buy now
LD3985M18R SOT23-5L Tape And Reel 1.8 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2771 1 Order Now
RS COMPONENTS EUROPE 2415 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 7694 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

2771

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2415

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

7694

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Buy now
LD3985M30R SOT23-5L Tape And Reel 3 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6690 1 Order Now
RS COMPONENTS EUROPE 2365 1 Order Now
MOUSER WORLDWIDE 9353 1 Order Now
Farnell Element14 EUROPE 5298 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

6690

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2365

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

9353

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5298

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Buy now
LD3985M27R SOT23-5L Tape And Reel 2.7 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

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: 2020-02-25

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: 2020-02-25

Buy now
LD3985M29R SOT23-5L Tape And Reel 2.9 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 910 1 Order Now

Distributor reported inventory date: 2020-02-24

Distributor Name

RS COMPONENTS

Stock

910

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-24

Buy now
LD3985M28R SOT23-5L Tape And Reel 2.8 2 0.15
Active
0.192 1000
MORE INFO

ECCN (US):

EAR99

Country of Origin:

MALAYSIA

Check Availability

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6000 1 Order Now
RS COMPONENTS EUROPE 1160 5 Order Now
MOUSER WORLDWIDE 6739 1 Order Now
Farnell Element14 EUROPE 6000 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

6000

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1160

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6739

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

6000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Buy now

LD3985M47R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5645 1 Order Now
MOUSER WORLDWIDE 6243 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

5645

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

6243

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

4.7

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M25R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6086 1 Order Now
COMPEL EUROPE 117 1 Order Now
RS COMPONENTS EUROPE 2180 5 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 6554 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

6086

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

117

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2180

Min.Order

5

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

6554

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M33R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5767 1 Order Now
RS COMPONENTS EUROPE 2385 5 Order Now
AVNET AMERICA 9000 0 Order Now
FUTURE WORLDWIDE 695 1 Order Now
MOUSER WORLDWIDE 6222 1 Order Now
Farnell Element14 EUROPE 1768 1 Order Now
RUTRONIK EUROPE 9000 3000 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

5767

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2385

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

9000

Min.Order

0

Region

AMERICA Order Now

FUTURE

Stock

695

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

6222

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1768

Min.Order

1

Region

EUROPE Order Now

RUTRONIK

Stock

9000

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

ECCN (US)

EAR99

Country of Origin

CHINA

LD3985M122R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5128 1 Order Now
COMPEL EUROPE 9072 1 Order Now
MOUSER WORLDWIDE 5539 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

5128

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

9072

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5539

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

1.22

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M18R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2771 1 Order Now
RS COMPONENTS EUROPE 2415 1 Order Now
ARROW EUROPE 3000 0 Order Now
MOUSER WORLDWIDE 7694 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

2771

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2415

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

3000

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

7694

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

1.8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M30R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6690 1 Order Now
RS COMPONENTS EUROPE 2365 1 Order Now
MOUSER WORLDWIDE 9353 1 Order Now
Farnell Element14 EUROPE 5298 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

6690

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2365

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

9353

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5298

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M27R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

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: 2020-02-25

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: 2020-02-25

Output Voltage (V) (nom)

2.7

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M29R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 910 1 Order Now

Distributor reported inventory date: 2020-02-24

Distributor Name

RS COMPONENTS

Stock

910

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-24

Output Voltage (V) (nom)

2.9

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LD3985M28R

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.192*

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6000 1 Order Now
RS COMPONENTS EUROPE 1160 5 Order Now
MOUSER WORLDWIDE 6739 1 Order Now
Farnell Element14 EUROPE 6000 1 Order Now

Distributor reported inventory date: 2020-02-25

Distributor Name

DIGIKEY

Stock

6000

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1160

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

6739

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

6000

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-25

Output Voltage (V) (nom)

2.8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Marketing Status

Active

Unit Price (US$)

0.192

Quantity

1000

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

Featured Products

Recommended for you

00 Files selected for download

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 2.0
      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**
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.

Support & Feedback