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  • The L5973AD is a step down monolithic power switching regulator with a switch current limit of 2A so it is able to deliver more than 1.5 A DC current to the load depending on the application conditions.

    The output voltage can be set from 1.235 V to 35 V. The high current level is also achieved thanks to an SO8 package with exposed frame, that allows to reduce the RthJA down to approximately 40 °C/W.
    The device uses an internal P-Channel D-MOS transistor (with a typical of 200 mΩ) as switching element to avoid the use of bootstrap capacitor and guarantee high efficiency.
    An internal oscillator fixes the switching frequency at 500 kHz to minimize the size of external components.
    Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus, available in all computer related applications.
    Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short circuit protection.

    Key Features

    • Inhibit for zero current consumption
    • Internal current limiting
    • Protection against feedback disconnection
    • Synchronization
    • Thermal shutdown
    • Voltage feedforward
    • 500 kHz Internally fixed frequency
    • 2 A Internal switch
    • 3.3 V / (±2 %) reference voltage
    • Operating input voltage from 4 V to 36 V
    • Low dropout operation: 100 % duty cycle
    • Zero load current operation
    • Output voltage adjustable from 1.235 V to 35 V

Circuit Diagram

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
L5973AD
Active
PowerSO-8 Industrial Ecopack2
L5973ADTR
Active
PowerSO-8 Industrial Ecopack2

L5973AD

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Industrial

RoHS Compliance Grade

Ecopack2

L5973ADTR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

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.

eDesignSuite

Converter

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

Output

V This option is required and must be a number.
A This option is required and must be a number.

LED Driver

Input

V This option is required. And must be less than or equal to Volt. Max [V]
V This option is required. And must be greater than or equal to Volt. Min [V]

LED custom

V This option is required.
A This option is required.
Ω This option is required.

LEDs

This option is required. And must be a whole positive number between 1 and 20.
This option is required. And must be a whole positive number between 1 and 20.

Sample & Buy

Part Number
Order from Distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
L5973AD Available at 9 distributors

Distributor availability ofL5973AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 915 1 Order Now
COMPEL EUROPE 170 1 Order Now
RS COMPONENTS EUROPE 745 5 Order Now
AVNET AMERICA 8758 0 Order Now
ARROW EUROPE 8081 0 Order Now
Newark Element14 AMERICA 7 0 Order Now
ARROW AMERICA 35 2000 Order Now
MOUSER WORLDWIDE 2824 1 Order Now
Farnell Element14 EUROPE 2302 1 Order Now

Distributor reported inventory date: 2020-09-24

Distributor Name

DIGIKEY

Stock

915

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

170

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

745

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

8758

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

8081

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

7

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

35

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

2824

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2302

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-24

Buy now
Active
EAR99 NEC Tube PowerSO-8 -40 150 PHILIPPINES 0.991 / 1k
L5973ADTR Available at 6 distributors

Distributor availability ofL5973ADTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9761 1 Order Now
COMPEL EUROPE 4437 1 Order Now
ARROW EUROPE 5000 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 2812 1 Order Now
Farnell Element14 EUROPE 2482 1 Order Now

Distributor reported inventory date: 2020-09-24

Distributor Name

DIGIKEY

Stock

9761

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

4437

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

2812

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2482

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-24

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel PowerSO-8 -40 150 PHILIPPINES 0.991 / 1k

L5973AD

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.991 / 1k

Distributor availability ofL5973AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 915 1 Order Now
COMPEL EUROPE 170 1 Order Now
RS COMPONENTS EUROPE 745 5 Order Now
AVNET AMERICA 8758 0 Order Now
ARROW EUROPE 8081 0 Order Now
Newark Element14 AMERICA 7 0 Order Now
ARROW AMERICA 35 2000 Order Now
MOUSER WORLDWIDE 2824 1 Order Now
Farnell Element14 EUROPE 2302 1 Order Now

Distributor reported inventory date: 2020-09-24

Distributor Name

DIGIKEY

Stock

915

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

170

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

745

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

8758

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

8081

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

7

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

35

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

2824

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2302

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-24

ECCN (EU)

NEC

Packing Type

Tube

Package

PowerSO-8

Operating Temperature (°C)

(min)

-40

(max)

150

Budgetary Price (US$)* / Qty

0.991 / 1k

Country of Origin

PHILIPPINES

L5973ADTR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.991 / 1k

Distributor availability ofL5973ADTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 9761 1 Order Now
COMPEL EUROPE 4437 1 Order Now
ARROW EUROPE 5000 0 Order Now
ARROW AMERICA 2500 2500 Order Now
MOUSER WORLDWIDE 2812 1 Order Now
Farnell Element14 EUROPE 2482 1 Order Now

Distributor reported inventory date: 2020-09-24

Distributor Name

DIGIKEY

Stock

9761

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

4437

Min.Order

1

Region

EUROPE Order Now

ARROW

Stock

5000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

2500

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

2812

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2482

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-09-24

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

PowerSO-8

Operating Temperature (°C)

(min)

-40

(max)

150

Budgetary Price (US$)* / Qty

0.991 / 1k

Country of Origin

PHILIPPINES

(*) 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