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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EDA Symbols, Footprints and 3D Models

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
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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 8371 1 Buy from Distributor
MOUSER WORLDWIDE 2804 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

8371

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

2804

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 4.7 0.2208 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2208

Country of Origin:

MALAYSIA

LD3985M25R Available at 4 distributors

Distributor availability ofLD3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 314 1 Buy from Distributor
RS COMPONENTS EUROPE 1635 5 Buy from Distributor
AVNET AMERICA 6000 0 Buy from Distributor
MOUSER WORLDWIDE 8184 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

314

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1635

Min.Order

5

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

8184

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
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 3 distributors

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 19288 1 Buy from Distributor
RS COMPONENTS EUROPE 1495 5 Buy from Distributor
FUTURE WORLDWIDE 24000 3000 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

19288

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1495

Min.Order

5

FUTURE

Stock

24000

Min.Order

3000

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3.3 0.2208 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2208

Country of Origin:

CHINA

LD3985M122R Available at 2 distributors

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4668 1 Buy from Distributor
MOUSER WORLDWIDE 5373 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

4668

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

5373

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 1.22 0.2208 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2208

Country of Origin:

MALAYSIA

LD3985M18R Available at 3 distributors

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 207 1 Buy from Distributor
AVNET AMERICA 6000 0 Buy from Distributor
MOUSER WORLDWIDE 2386 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

207

Min.Order

1

Region

WORLDWIDE Buy from Distributor

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

2386

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 1.8 0.2208 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2208

Country of Origin:

MALAYSIA

LD3985M30R Available at 5 distributors

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5421 1 Buy from Distributor
RS COMPONENTS EUROPE 2200 1 Buy from Distributor
AVNET AMERICA 27000 0 Buy from Distributor
MOUSER WORLDWIDE 8077 1 Buy from Distributor
Farnell Element14 EUROPE 3016 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

5421

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

2200

Min.Order

1

AVNET

Stock

27000

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

8077

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

3016

Min.Order

1

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 3 0.2208 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2208

Country of Origin:

CHINA

LD3985M27R Available at 2 distributors

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7055 1 Buy from Distributor
MOUSER WORLDWIDE 2551 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

7055

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

2551

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.7 0.2208 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2208

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 Buy from Distributor

Distributor reported inventory date: 2021-10-11

Distributor Name

RS COMPONENTS

Stock

615

Min.Order

1

Distributor reported inventory date: 2021-10-11

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.9 0.2208 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2208

Country of Origin:

MALAYSIA

LD3985M28R Available at 4 distributors

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5937 1 Buy from Distributor
RS COMPONENTS EUROPE 1055 5 Buy from Distributor
MOUSER WORLDWIDE 5986 1 Buy from Distributor
Farnell Element14 EUROPE 5507 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

5937

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1055

Min.Order

5

MOUSER

Stock

5986

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

5507

Min.Order

1

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 2.8 0.2208 / 1k
MORE INFO

Output Tolerance (typ):

2

Output Current (A) (nom):

0.15

Unit Price (US$):

0.2208

Country of Origin:

MALAYSIA

LD3985M47R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2208 / 1k

Distributor availability ofLD3985M47R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8371 1 Buy from Distributor
MOUSER WORLDWIDE 2804 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

8371

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

2804

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

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

0.2208 / 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 314 1 Buy from Distributor
RS COMPONENTS EUROPE 1635 5 Buy from Distributor
AVNET AMERICA 6000 0 Buy from Distributor
MOUSER WORLDWIDE 8184 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

314

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1635

Min.Order

5

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

8184

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

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

0.2208 / 1k

Distributor availability ofLD3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 19288 1 Buy from Distributor
RS COMPONENTS EUROPE 1495 5 Buy from Distributor
FUTURE WORLDWIDE 24000 3000 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

19288

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1495

Min.Order

5

FUTURE

Stock

24000

Min.Order

3000

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

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

0.2208 / 1k

Country of Origin

CHINA

LD3985M122R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2208 / 1k

Distributor availability ofLD3985M122R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4668 1 Buy from Distributor
MOUSER WORLDWIDE 5373 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

4668

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

5373

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

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

0.2208 / 1k

Country of Origin

MALAYSIA

LD3985M18R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2208 / 1k

Distributor availability ofLD3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 207 1 Buy from Distributor
AVNET AMERICA 6000 0 Buy from Distributor
MOUSER WORLDWIDE 2386 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

207

Min.Order

1

Region

WORLDWIDE Buy from Distributor

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

2386

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

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

0.2208 / 1k

Country of Origin

MALAYSIA

LD3985M30R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2208 / 1k

Distributor availability ofLD3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5421 1 Buy from Distributor
RS COMPONENTS EUROPE 2200 1 Buy from Distributor
AVNET AMERICA 27000 0 Buy from Distributor
MOUSER WORLDWIDE 8077 1 Buy from Distributor
Farnell Element14 EUROPE 3016 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

5421

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

2200

Min.Order

1

AVNET

Stock

27000

Min.Order

0

Region

AMERICA Buy from Distributor

MOUSER

Stock

8077

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

3016

Min.Order

1

Distributor reported inventory date: 2021-10-16

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

0.2208 / 1k

Country of Origin

CHINA

LD3985M27R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2208 / 1k

Distributor availability ofLD3985M27R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7055 1 Buy from Distributor
MOUSER WORLDWIDE 2551 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

7055

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

2551

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

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

0.2208 / 1k

Country of Origin

MALAYSIA

LD3985M29R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2208 / 1k

Distributor availability ofLD3985M29R

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

Distributor reported inventory date: 2021-10-11

Distributor Name

RS COMPONENTS

Stock

615

Min.Order

1

Distributor reported inventory date: 2021-10-11

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

0.2208 / 1k

Country of Origin

MALAYSIA

LD3985M28R

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.2208 / 1k

Distributor availability ofLD3985M28R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 5937 1 Buy from Distributor
RS COMPONENTS EUROPE 1055 5 Buy from Distributor
MOUSER WORLDWIDE 5986 1 Buy from Distributor
Farnell Element14 EUROPE 5507 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

5937

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

1055

Min.Order

5

MOUSER

Stock

5986

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

5507

Min.Order

1

Distributor reported inventory date: 2021-10-16

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

0.2208 / 1k

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