LD3985

Active
Design Win

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

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Product overview

Description

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.
  • All 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

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STMicroelectronics - LD3985

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Quality and Reliability

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.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Output Voltage (V) (nom)
Budgetary Price (US$)*/Qty
More info
min
max
LD3985M47R Available at 2 distributors

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2155 1 Buy from Distributor
MOUSER WORLDWIDE 3766 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

2155

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

3766

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 4.7
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2788

Country of Origin:

MALAYSIA

LD3985M25R Available at 4 distributors

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 16865 1 Buy from Distributor
COMPEL EUROPE 2672 1 Buy from Distributor
RS COMPONENTS EUROPE 1405 5 Buy from Distributor
MOUSER WORLDWIDE 6082 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

16865

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

2672

Min.Order

1

RS COMPONENTS

Stock

1405

Min.Order

5

MOUSER

Stock

6082

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.5
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2922

Country of Origin:

CHINA

LD3985M33R Available at 3 distributors

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1670 5 Buy from Distributor
MOUSER WORLDWIDE 56651 1 Buy from Distributor
Farnell Element14 EUROPE 785 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

RS COMPONENTS

Stock

1670

Min.Order

5

MOUSER

Stock

56651

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

785

Min.Order

1

Distributor reported inventory date: 2022-05-26

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3.3
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2922

Country of Origin:

CHINA

LD3985M122R Available at 3 distributors

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3652 1 Buy from Distributor
COMPEL EUROPE 6265 1 Buy from Distributor
MOUSER WORLDWIDE 4873 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

3652

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

6265

Min.Order

1

MOUSER

Stock

4873

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 1.22
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2788

Country of Origin:

MALAYSIA

LD3985M18R Available at 2 distributors

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2260 1 Buy from Distributor
MOUSER WORLDWIDE 3466 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

2260

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

3466

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 1.8
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2788

Country of Origin:

MALAYSIA

LD3985M30R Available at 4 distributors

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8721 1 Buy from Distributor
RS COMPONENTS EUROPE 860 1 Buy from Distributor
MOUSER WORLDWIDE 5475 1 Buy from Distributor
Farnell Element14 EUROPE 2588 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

8721

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

860

Min.Order

1

MOUSER

Stock

5475

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

2588

Min.Order

1

Distributor reported inventory date: 2022-05-26

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2788

Country of Origin:

CHINA

LD3985M27R Available at 1 distributors

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 3000 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

MOUSER

Stock

3000

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.7
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2788

Country of Origin:

MALAYSIA

LD3985M29R Available at 1 distributors

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 50 1 Buy from Distributor

Distributor reported inventory date: 2022-05-23

Distributor Name

RS COMPONENTS

Stock

50

Min.Order

1

Distributor reported inventory date: 2022-05-23

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.9
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2788

Country of Origin:

MALAYSIA

LD3985M28R Available at 3 distributors

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 950 5 Buy from Distributor
MOUSER WORLDWIDE 5929 1 Buy from Distributor
Farnell Element14 EUROPE 2190 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

RS COMPONENTS

Stock

950

Min.Order

5

MOUSER

Stock

5929

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

2190

Min.Order

1

Distributor reported inventory date: 2022-05-26

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.8
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2788

Country of Origin:

MALAYSIA

LD3985M47R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2155 1 Buy from Distributor
MOUSER WORLDWIDE 3766 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

2155

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

3766

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

4.7

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

MALAYSIA

LD3985M25R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 16865 1 Buy from Distributor
COMPEL EUROPE 2672 1 Buy from Distributor
RS COMPONENTS EUROPE 1405 5 Buy from Distributor
MOUSER WORLDWIDE 6082 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

16865

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

2672

Min.Order

1

RS COMPONENTS

Stock

1405

Min.Order

5

MOUSER

Stock

6082

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

CHINA

LD3985M33R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 1670 5 Buy from Distributor
MOUSER WORLDWIDE 56651 1 Buy from Distributor
Farnell Element14 EUROPE 785 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

RS COMPONENTS

Stock

1670

Min.Order

5

MOUSER

Stock

56651

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

785

Min.Order

1

Distributor reported inventory date: 2022-05-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

CHINA

LD3985M122R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3652 1 Buy from Distributor
COMPEL EUROPE 6265 1 Buy from Distributor
MOUSER WORLDWIDE 4873 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

3652

Min.Order

1

Region

WORLDWIDE Buy from Distributor

COMPEL

Stock

6265

Min.Order

1

MOUSER

Stock

4873

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

1.22

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

MALAYSIA

LD3985M18R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2260 1 Buy from Distributor
MOUSER WORLDWIDE 3466 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

2260

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

3466

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

1.8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

MALAYSIA

LD3985M30R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8721 1 Buy from Distributor
RS COMPONENTS EUROPE 860 1 Buy from Distributor
MOUSER WORLDWIDE 5475 1 Buy from Distributor
Farnell Element14 EUROPE 2588 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

DIGIKEY

Stock

8721

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

860

Min.Order

1

MOUSER

Stock

5475

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

2588

Min.Order

1

Distributor reported inventory date: 2022-05-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

3

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

CHINA

LD3985M27R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 3000 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

MOUSER

Stock

3000

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-05-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.7

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

MALAYSIA

LD3985M29R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 50 1 Buy from Distributor

Distributor reported inventory date: 2022-05-23

Distributor Name

RS COMPONENTS

Stock

50

Min.Order

1

Distributor reported inventory date: 2022-05-23

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.9

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

MALAYSIA

LD3985M28R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 950 5 Buy from Distributor
MOUSER WORLDWIDE 5929 1 Buy from Distributor
Farnell Element14 EUROPE 2190 1 Buy from Distributor

Distributor reported inventory date: 2022-05-26

Distributor Name

RS COMPONENTS

Stock

950

Min.Order

5

MOUSER

Stock

5929

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

2190

Min.Order

1

Distributor reported inventory date: 2022-05-26

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Output Voltage (V) (nom)

2.8

Output Tolerance (typ)

2

Output Current (A) (nom)

0.15

Budgetary Price (US$)* / Qty

Country of Origin

MALAYSIA

(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors