LD3985

Active

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

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Temperature (°C) Output Voltage (V) (nom)
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min
max
LD3985M47R Available at 2 distributors

Distributor availability ofLD3985M47R

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DIGIKEY WORLDWIDE 8386 1 Order Now
MOUSER WORLDWIDE 2816 1 Order Now

Distributor reported inventory date: 2021-04-20

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DIGIKEY

Stock

8386

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1

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2816

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EAR99 NEC Tape And Reel SOT23-5L -40 125 4.7 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M25R Available at 4 distributors

Distributor availability ofLD3985M25R

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5071 1 Order Now
RS COMPONENTS EUROPE 1835 5 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 8474 1 Order Now

Distributor reported inventory date: 2021-04-20

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DIGIKEY

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5071

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1

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RS COMPONENTS

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1835

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5

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EUROPE Order Now

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6000

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0

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Stock

8474

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1

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EAR99 NEC Tape And Reel SOT23-5L -40 125 2.5 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

CHINA

LD3985M33R Available at 5 distributors

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9483 1 Order Now
RS COMPONENTS EUROPE 3040 5 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
MOUSER WORLDWIDE 7943 1 Order Now
Farnell Element14 EUROPE 1563 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

9483

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3040

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

MOUSER

Stock

7943

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1563

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-04-20

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Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3.3 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

CHINA

LD3985M122R Available at 2 distributors

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4918 1 Order Now
MOUSER WORLDWIDE 5375 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

4918

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5375

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-04-20

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Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 1.22 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M18R Available at 4 distributors

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3502 1 Order Now
RS COMPONENTS EUROPE 165 1 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 3046 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

3502

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

165

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3046

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-04-20

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 1.8 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M30R Available at 4 distributors

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2651 1 Order Now
RS COMPONENTS EUROPE 2330 1 Order Now
MOUSER WORLDWIDE 5724 1 Order Now
Farnell Element14 EUROPE 3842 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

2651

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2330

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5724

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3842

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-04-20

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Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

CHINA

LD3985M27R Available at 2 distributors

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7065 1 Order Now
MOUSER WORLDWIDE 5910 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

7065

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5910

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-04-20

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.7 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M29R Available at 1 distributors

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 615 1 Order Now

Distributor reported inventory date: 2021-04-19

Distributor Name

RS COMPONENTS

Stock

615

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-04-19

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.9 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M28R Available at 4 distributors

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5963 1 Order Now
RS COMPONENTS EUROPE 1060 5 Order Now
MOUSER WORLDWIDE 5986 1 Order Now
Farnell Element14 EUROPE 5529 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

5963

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1060

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

5986

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5529

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-04-20

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.8 0.192 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.192

Country of Origin:

MALAYSIA

LD3985M47R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8386 1 Order Now
MOUSER WORLDWIDE 2816 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

8386

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2816

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-04-20

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

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M25R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5071 1 Order Now
RS COMPONENTS EUROPE 1835 5 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 8474 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

5071

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1835

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

8474

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-04-20

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

0.192 / 1k

Country of Origin

CHINA

LD3985M33R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9483 1 Order Now
RS COMPONENTS EUROPE 3040 5 Order Now
FUTURE WORLDWIDE 3000 3000 Order Now
MOUSER WORLDWIDE 7943 1 Order Now
Farnell Element14 EUROPE 1563 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

9483

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

3040

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

3000

Min.Order

3000

Region

WORLDWIDE Order Now

MOUSER

Stock

7943

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1563

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-04-20

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

0.192 / 1k

Country of Origin

CHINA

LD3985M122R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4918 1 Order Now
MOUSER WORLDWIDE 5375 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

4918

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5375

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-04-20

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

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M18R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3502 1 Order Now
RS COMPONENTS EUROPE 165 1 Order Now
AVNET AMERICA 6000 0 Order Now
MOUSER WORLDWIDE 3046 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

3502

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

165

Min.Order

1

Region

EUROPE Order Now

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

3046

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-04-20

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

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M30R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2651 1 Order Now
RS COMPONENTS EUROPE 2330 1 Order Now
MOUSER WORLDWIDE 5724 1 Order Now
Farnell Element14 EUROPE 3842 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

2651

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2330

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

5724

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3842

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-04-20

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

0.192 / 1k

Country of Origin

CHINA

LD3985M27R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7065 1 Order Now
MOUSER WORLDWIDE 5910 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

7065

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5910

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2021-04-20

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

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M29R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M29R

Distributor Name
Region Stock Min. Order Third party link
RS COMPONENTS EUROPE 615 1 Order Now

Distributor reported inventory date: 2021-04-19

Distributor Name

RS COMPONENTS

Stock

615

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-04-19

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

0.192 / 1k

Country of Origin

MALAYSIA

LD3985M28R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.192 / 1k

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5963 1 Order Now
RS COMPONENTS EUROPE 1060 5 Order Now
MOUSER WORLDWIDE 5986 1 Order Now
Farnell Element14 EUROPE 5529 1 Order Now

Distributor reported inventory date: 2021-04-20

Distributor Name

DIGIKEY

Stock

5963

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1060

Min.Order

5

Region

EUROPE Order Now

MOUSER

Stock

5986

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

5529

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2021-04-20

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

0.192 / 1k

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