Overview
Sample & Buy
Solutions
Resources
Tools & Software
Quality & Reliability
eDesignSuite
Get Started
Partner products
Sales Briefcase
  • The LDS3985 provides up to 300 mA, from 2.5 V to 6 V input voltage. It is stable with ceramic and high quality tantalum capacitor. The ultra low drop voltage, low quiescent current and low noise make it suitable for low power applications and battery-powered systems. 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. Typical applications are mobile phones and similar battery-powered wireless systems, portable information appliances.

    Key Features

    • Input voltage from 2.5 V to 6 V
    • Stable with low ESR ceramic capacitors
    • Very low dropout voltage (150 mV typ. at 300 mA load, 0.4 mV typ. at 1 mA load)
    • Very low quiescent current (85 µA typ. at no load, 200 µA typ. at 300 mA load; max.1.5 µA in OFF mode)
    • Guaranteed output current up to 300 mA
    • Wide range of output voltages available on request: fixed from 1.25 V to 5 V with 100 mV step
    • Fast turn-on time: typ. 240 µs
      • [CO = 2.2 µF, CBYP = 33 nF and IO= 1 mA]
    • Logic-controlled electronic shutdown
    • Internal current and thermal limit
    • Low output voltage noise: 30 µ VRMS over 10 Hz to 100 kHz
    • SVR of 55 dB at 1 kHz, 50 dB at 10 kHz
    • Temperature range: - 40 °C to 125 °C
    • Automotive grade product available in DFN6 package, temperature range: - 40 °C to 85 °C

Recommended for you

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS4148
      Very low drop and low noise BiCMOS 300 mA voltage regulator
      10.0
      938.02 KB
      PDF
      DS4148

      Very low drop and low noise BiCMOS 300 mA voltage regulator

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
      PDF

      Low-dropout (LDO) linear voltage regulators Quick Reference Guide

      Power management for handheld and portable

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
LDS3985M15R
NRND
SOT23-5L Industrial Ecopack2
LDS3985M18R
Active
SOT23-5L Industrial Ecopack2
LDS3985M25R
Active
SOT23-5L Industrial Ecopack2
LDS3985M28R
NRND
SOT23-5L Industrial Ecopack2
LDS3985M30R
Active
SOT23-5L Industrial Ecopack2
LDS3985M33R
Active
SOT23-5L Industrial Ecopack2
LDS3985M50R
NRND
SOT23-5L Industrial Ecopack2
LDS3985PU15R
Active
DFN6 3x3 Industrial Ecopack2
LDS3985PU18RY
Active
DFN6 3x3 Automotive Ecopack2
LDS3985PU28R
NRND
DFN6 3x3 Industrial Ecopack2
LDS3985PU33R
Active
DFN6 3x3 Industrial Ecopack2
LDS3985PU33RY
Active
DFN6 3x3 Automotive Ecopack2

LDS3985M15R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

NRND

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985M18R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985M25R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985M28R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

NRND

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985M30R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985M33R

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985M50R

Package:

SOT23-5L

Material Declaration**:

Marketing Status

NRND

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985PU15R

Package:

DFN6 3x3

Material Declaration**:

Marketing Status

Active

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985PU18RY

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 3x3

Grade

Automotive

RoHS Compliance Grade

Ecopack2

LDS3985PU28R

Package:

DFN6 3x3

Material Declaration**:

Marketing Status

NRND

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985PU33R

Package:

DFN6 3x3

Material Declaration**:

Marketing Status

Active

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDS3985PU33RY

Package:

DFN6 3x3

Material Declaration**:

Marketing Status

Active

Package

DFN6 3x3

Grade

Automotive

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
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
LDS3985M30R Available at 3 distributors

Distributor availability ofLDS3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 12993 1 Order Now
MOUSER WORLDWIDE 2430 1 Order Now
Farnell Element14 EUROPE 3179 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

12993

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2430

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3179

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Buy now SOT23-5L Tape And Reel 3 3 0.3
Active
EAR99 MALAYSIA 0.24 / 1k
LDS3985M25R Available at 2 distributors

Distributor availability ofLDS3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3045 1 Order Now
MOUSER WORLDWIDE 4628 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

3045

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4628

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-12

Buy now SOT23-5L Tape And Reel 2.5 3 0.3
Active
EAR99 MALAYSIA 0.24 / 1k
LDS3985PU33RY Available at 1 distributors

Distributor availability ofLDS3985PU33RY

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 2062 1 Order Now

Distributor reported inventory date: 2020-07-11

Distributor Name

Farnell Element14

Stock

2062

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-11

Buy now DFN6 3x3 Tape And Reel 3.3 3 0.3
Active
EAR99 MALAYSIA 0.6 / 1k
LDS3985M28R Available at 1 distributors

Distributor availability ofLDS3985M28R

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 95 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

MOUSER

Stock

95

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-12

Buy now SOT23-5L Tape And Reel 2.8 3 0.3
NRND
EAR99 MALAYSIA 0.24 / 1k
LDS3985M18R Available at 4 distributors

Distributor availability ofLDS3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 184 1 Order Now
ARROW AMERICA 15000 3000 Order Now
MOUSER WORLDWIDE 1967 1 Order Now
Farnell Element14 EUROPE 2847 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

184

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

15000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

1967

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2847

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Buy now SOT23-5L Tape And Reel 1.8 3 0.3
Active
EAR99 MALAYSIA 0.24 / 1k
LDS3985PU33R Available at 1 distributors

Distributor availability ofLDS3985PU33R

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 17 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

MOUSER

Stock

17

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-12

Buy now DFN6 3x3 Tape And Reel 3.3 3 0.3
Active
EAR99 MALAYSIA 0.401 / 1k
LDS3985M33R Available at 8 distributors

Distributor availability ofLDS3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 39774 1 Order Now
COMPEL EUROPE 17487 1 Order Now
RS COMPONENTS EUROPE 275 25 Order Now
FUTURE WORLDWIDE 4867 1 Order Now
ARROW EUROPE 6000 0 Order Now
ARROW AMERICA 18000 3000 Order Now
MOUSER WORLDWIDE 4779 1 Order Now
Farnell Element14 EUROPE 989 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

39774

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

17487

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

275

Min.Order

25

Region

EUROPE Order Now

FUTURE

Stock

4867

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

18000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

4779

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

989

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Buy now SOT23-5L Tape And Reel 3.3 3 0.3
Active
EAR99 CHINA 0.24 / 1k
LDS3985M50R No availability of distributors reported, please contact our sales office SOT23-5L Tape And Reel 5 3 0.3
NRND
EAR99 MALAYSIA 0.24 / 1k
LDS3985PU15R No availability of distributors reported, please contact our sales office DFN6 3x3 Tape And Reel 1.5 3 0.3
Active
EAR99 MALAYSIA 0.401 / 1k
LDS3985PU28R No availability of distributors reported, please contact our sales office DFN6 3x3 Tape And Reel 2.8 3 0.3
NRND
EAR99 MALAYSIA 0.401 / 1k
LDS3985M15R No availability of distributors reported, please contact our sales office Buy now SOT23-5L Tape And Reel 1.5 3 0.3
NRND
EAR99 MALAYSIA 0.24 / 1k
LDS3985PU18RY Available at 1 distributors

Distributor availability ofLDS3985PU18RY

Distributor Name
Region Stock Min. Order Third party link
AVNET AMERICA 6000 0 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

Distributor reported inventory date: 2020-07-12

Buy now DFN6 3x3 Tape And Reel 1.8 3 0.3
Active
EAR99 MALAYSIA 0.6 / 1k

LDS3985M30R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.24 / 1k

Distributor availability ofLDS3985M30R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 12993 1 Order Now
MOUSER WORLDWIDE 2430 1 Order Now
Farnell Element14 EUROPE 3179 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

12993

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2430

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3179

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Output Voltage (V) (nom)

3

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.24 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985M25R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.24 / 1k

Distributor availability ofLDS3985M25R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3045 1 Order Now
MOUSER WORLDWIDE 4628 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

3045

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

4628

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-12

Output Voltage (V) (nom)

2.5

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.24 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985PU33RY

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.6 / 1k

Distributor availability ofLDS3985PU33RY

Distributor Name
Region Stock Min. Order Third party link
Farnell Element14 EUROPE 2062 1 Order Now

Distributor reported inventory date: 2020-07-11

Distributor Name

Farnell Element14

Stock

2062

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-11

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.6 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985M28R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.24 / 1k

Distributor availability ofLDS3985M28R

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 95 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

MOUSER

Stock

95

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-12

Output Voltage (V) (nom)

2.8

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

NRND

Budgetary Price (US$)* / Qty

0.24 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985M18R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.24 / 1k

Distributor availability ofLDS3985M18R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 184 1 Order Now
ARROW AMERICA 15000 3000 Order Now
MOUSER WORLDWIDE 1967 1 Order Now
Farnell Element14 EUROPE 2847 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

184

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

15000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

1967

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2847

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Output Voltage (V) (nom)

1.8

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.24 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985PU33R

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.401 / 1k

Distributor availability ofLDS3985PU33R

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 17 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

MOUSER

Stock

17

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-07-12

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.401 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985M33R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.24 / 1k

Distributor availability ofLDS3985M33R

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 39774 1 Order Now
COMPEL EUROPE 17487 1 Order Now
RS COMPONENTS EUROPE 275 25 Order Now
FUTURE WORLDWIDE 4867 1 Order Now
ARROW EUROPE 6000 0 Order Now
ARROW AMERICA 18000 3000 Order Now
MOUSER WORLDWIDE 4779 1 Order Now
Farnell Element14 EUROPE 989 1 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

DIGIKEY

Stock

39774

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

17487

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

275

Min.Order

25

Region

EUROPE Order Now

FUTURE

Stock

4867

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

6000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

18000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

4779

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

989

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-12

Output Voltage (V) (nom)

3.3

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.24 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LDS3985M50R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.24 / 1k

Output Voltage (V) (nom)

5

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

NRND

Budgetary Price (US$)* / Qty

0.24 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985PU15R

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.401 / 1k

Output Voltage (V) (nom)

1.5

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.401 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985PU28R

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.401 / 1k

Output Voltage (V) (nom)

2.8

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

NRND

Budgetary Price (US$)* / Qty

0.401 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985M15R

Package

SOT23-5L

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.24 / 1k

Output Voltage (V) (nom)

1.5

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

NRND

Budgetary Price (US$)* / Qty

0.24 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

LDS3985PU18RY

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.6 / 1k

Distributor availability ofLDS3985PU18RY

Distributor Name
Region Stock Min. Order Third party link
AVNET AMERICA 6000 0 Order Now

Distributor reported inventory date: 2020-07-12

Distributor Name

AVNET

Stock

6000

Min.Order

0

Region

AMERICA Order Now

Distributor reported inventory date: 2020-07-12

Output Voltage (V) (nom)

1.8

Output Tolerance (typ)

3

Output Current (A) (nom)

0.3

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.6 / 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