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  • The LDFM is a fast, very low drop linear regulator which operates from an input supply voltage in the range of 2.5 V to 16 V.

    It is available in fixed and adjustable output voltage versions, from 0.8 V to 12 V.
    The LDFM features high output precision, very low dropout voltage, low noise, and low quiescent current, therefore suitable for low voltage microprocessors and memory applications.
    Enable logic control pin and Power Good output are featured on PPAK/DFN packages.
    Current and thermal protection are provided.

    Key Features

    • Input voltage from 2.5 to 16 V
    • Very low dropout voltage (300 mV max. at 500 mA load)
    • Low quiescent current (200 µA typ. @ 500 mA load)
    • Available in 1 % precision in PPAK and DFN6 packages, 2 % in DPAK
    • 500 mA guaranteed output current
    • Wide range of output voltages available on request: adjustable from 0.8 V, fixed up to 12 V in 100 mV steps
    • Logic-controlled electronic shutdown
    • Power Good (PPAK and DFN packages)
    • Fast dynamic response to line and load changes
    • Internal current and thermal protection
    • Temperature range: - 40 °C to 125 °C

Recommended for you

Related Applications

Home, Building and City Automation

Industrial Power and Tools

Lighting and Controls

Smart Farming

00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS9220
      500 mA very low drop voltage regulator
      5.0
      1.9 MB
      PDF
      DS9220

      500 mA very low drop 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**
LDFM33PUR
Active
DFN6 3x3 Industrial Ecopack2
LDFM33PVR
Active
DFN6 2x2 Industrial Ecopack2
LDFM50DT-TR
Active
DPAK Industrial Ecopack2
LDFM50PT-TR
NRND
PPACK 5 Industrial Ecopack2
LDFMPT-TR
Active
PPACK 5 Industrial Ecopack2
LDFMPUR
Active
DFN6 3x3 Industrial Ecopack2
LDFMPVR
Active
DFN6 2x2 Industrial Ecopack2

LDFM33PUR

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFM33PVR

Package:

DFN6 2x2

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 2x2

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFM50DT-TR

Package:

DPAK

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DPAK

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFM50PT-TR

Package:

PPACK 5

Material Declaration**:

Marketing Status

NRND

Package

PPACK 5

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFMPT-TR

Package:

PPACK 5

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PPACK 5

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFMPUR

Package:

DFN6 3x3

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 3x3

Grade

Industrial

RoHS Compliance Grade

Ecopack2

LDFMPVR

Package:

DFN6 2x2

Material Declaration**:

PDF XML

Marketing Status

Active

Package

DFN6 2x2

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
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
LDFM50DT-TR Available at 3 distributors

Distributor availability ofLDFM50DT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2366 1 Order Now
MOUSER WORLDWIDE 2500 1 Order Now
Farnell Element14 EUROPE 1699 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2366

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2500

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1699

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Get sample DPAK Tape And Reel 5 2 0.5
Active
EAR99 CHINA 0.476 / 1k
LDFMPUR Available at 4 distributors

Distributor availability ofLDFMPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8 1 Order Now
FUTURE WORLDWIDE 9000 3000 Order Now
MOUSER WORLDWIDE 776 1 Order Now
Farnell Element14 EUROPE 1816 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

8

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

9000

Min.Order

3000

Region

WORLDWIDE Order Now

MOUSER

Stock

776

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1816

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Get sample DFN6 3x3 Tape And Reel - 2 0.5
Active
EAR99 CHINA 0.476 / 1k
LDFMPVR Available at 3 distributors

Distributor availability ofLDFMPVR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2723 1 Order Now
MOUSER WORLDWIDE 2242 1 Order Now
Farnell Element14 EUROPE 2478 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2723

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2242

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2478

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Get sample DFN6 2x2 Tape And Reel - 2 0.5
Active
EAR99 CHINA 0.476 / 1k
LDFM33PUR Available at 3 distributors

Distributor availability ofLDFM33PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2508 1 Order Now
MOUSER WORLDWIDE 5749 1 Order Now
Farnell Element14 EUROPE 1885 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2508

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5749

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1885

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Buy now DFN6 3x3 Tape And Reel - 2 0.5
Active
EAR99 CHINA 0.476 / 1k
LDFMPT-TR Available at 6 distributors

Distributor availability ofLDFMPT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4153 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 2880 1 Order Now
MOUSER WORLDWIDE 1189 1 Order Now
Farnell Element14 EUROPE 1138 1 Order Now
ANGLIA Live EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

4153

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2880

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

1189

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1138

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Get sample PPACK 5 Tape And Reel - 2 0.5
Active
EAR99 CHINA 0.476 / 1k
LDFM33PVR Available at 2 distributors

Distributor availability ofLDFM33PVR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2420 1 Order Now
Farnell Element14 EUROPE 2681 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

MOUSER

Stock

2420

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2681

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Buy now DFN6 2x2 Tape And Reel - 2 0.5
Active
EAR99 CHINA 0.476 / 1k
LDFM50PT-TR Available at 4 distributors

Distributor availability ofLDFM50PT-TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 63822 1 Order Now
Newark Element14 AMERICA 49 0 Order Now
MOUSER WORLDWIDE 1836 1 Order Now
Farnell Element14 EUROPE 3123 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

COMPEL

Stock

63822

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

49

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1836

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3123

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Buy now PPACK 5 Tape And Reel 5 2 0.5
NRND
EAR99 CHINA 0.476 / 1k

LDFM50DT-TR

Package

DPAK

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFM50DT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2366 1 Order Now
MOUSER WORLDWIDE 2500 1 Order Now
Farnell Element14 EUROPE 1699 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2366

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2500

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1699

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.476 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LDFMPUR

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFMPUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 8 1 Order Now
FUTURE WORLDWIDE 9000 3000 Order Now
MOUSER WORLDWIDE 776 1 Order Now
Farnell Element14 EUROPE 1816 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

8

Min.Order

1

Region

WORLDWIDE Order Now

FUTURE

Stock

9000

Min.Order

3000

Region

WORLDWIDE Order Now

MOUSER

Stock

776

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1816

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

-

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.476 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LDFMPVR

Package

DFN6 2x2

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFMPVR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2723 1 Order Now
MOUSER WORLDWIDE 2242 1 Order Now
Farnell Element14 EUROPE 2478 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2723

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2242

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2478

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

-

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.476 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LDFM33PUR

Package

DFN6 3x3

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFM33PUR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2508 1 Order Now
MOUSER WORLDWIDE 5749 1 Order Now
Farnell Element14 EUROPE 1885 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

2508

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

5749

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1885

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

-

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.476 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LDFMPT-TR

Package

PPACK 5

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFMPT-TR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 4153 1 Order Now
COMPEL EUROPE 1 1 Order Now
RS COMPONENTS EUROPE 2880 1 Order Now
MOUSER WORLDWIDE 1189 1 Order Now
Farnell Element14 EUROPE 1138 1 Order Now
ANGLIA Live EUROPE 2500 2500 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

DIGIKEY

Stock

4153

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

2880

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

1189

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1138

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

2500

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

-

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.476 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LDFM33PVR

Package

DFN6 2x2

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFM33PVR

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 2420 1 Order Now
Farnell Element14 EUROPE 2681 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

MOUSER

Stock

2420

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2681

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

-

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.476 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

LDFM50PT-TR

Package

PPACK 5

Packing Type

Tape And Reel

Budgetary Price (US$)*/Qty

0.476 / 1k

Distributor availability ofLDFM50PT-TR

Distributor Name
Region Stock Min. Order Third party link
COMPEL EUROPE 63822 1 Order Now
Newark Element14 AMERICA 49 0 Order Now
MOUSER WORLDWIDE 1836 1 Order Now
Farnell Element14 EUROPE 3123 1 Order Now

Distributor reported inventory date: 2020-07-09

Distributor Name

COMPEL

Stock

63822

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

49

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

1836

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3123

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-07-09

Output Voltage (V) (nom)

5

Output Tolerance (typ)

2

Output Current (A) (nom)

0.5

Marketing Status

NRND

Budgetary Price (US$)* / Qty

0.476 / 1k

ECCN (US)

EAR99

Country of Origin

CHINA

(*) 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