Up to 1.5 A step down switching regulator

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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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L5973AD PowerSO-8 Tube
Active
0.991 10000 EAR99 - Check Availability

Distributor availability ofL5973AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2360 1 Order Now
RS COMPONENTS EUROPE 1520 5 Order Now
AVNET AMERICA 9284 0 Order Now
ARROW EUROPE 3345 0 Order Now
Newark Element14 AMERICA 10 0 Order Now
ARROW AMERICA 633 2000 Order Now
MOUSER WORLDWIDE 1988 1 Order Now
Farnell Element14 EUROPE 10567 1 Order Now
ANGLIA Live EUROPE 7414 1 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

2360

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1520

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

9284

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3345

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

10

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

633

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

1988

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

10567

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

7414

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

Buy now
L5973ADTR PowerSO-8 Tape And Reel
Active
0.991 10000 EAR99 - Check Availability

Distributor availability ofL5973ADTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6523 1 Order Now
ARROW EUROPE 10000 0 Order Now
ARROW AMERICA 5000 2500 Order Now
MOUSER WORLDWIDE 4567 1 Order Now
RUTRONIK EUROPE 25000 2500 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

6523

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

10000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

5000

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

4567

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

25000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

Get sample

L5973AD

Package

PowerSO-8

Packing Type

Tube

Unit Price (US$)

0.991*

Distributor availability ofL5973AD

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2360 1 Order Now
RS COMPONENTS EUROPE 1520 5 Order Now
AVNET AMERICA 9284 0 Order Now
ARROW EUROPE 3345 0 Order Now
Newark Element14 AMERICA 10 0 Order Now
ARROW AMERICA 633 2000 Order Now
MOUSER WORLDWIDE 1988 1 Order Now
Farnell Element14 EUROPE 10567 1 Order Now
ANGLIA Live EUROPE 7414 1 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

2360

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1520

Min.Order

5

Region

EUROPE Order Now

AVNET

Stock

9284

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3345

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

10

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

633

Min.Order

2000

Region

AMERICA Order Now

MOUSER

Stock

1988

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

10567

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

7414

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

Marketing Status

Active

Unit Price (US$)

0.991

Quantity

10000

ECCN (US)

EAR99

Country of Origin

-

L5973ADTR

Package

PowerSO-8

Packing Type

Tape And Reel

Unit Price (US$)

0.991*

Distributor availability ofL5973ADTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 6523 1 Order Now
ARROW EUROPE 10000 0 Order Now
ARROW AMERICA 5000 2500 Order Now
MOUSER WORLDWIDE 4567 1 Order Now
RUTRONIK EUROPE 25000 2500 Order Now

Distributor reported inventory date: 2019-09-13

Distributor Name

DIGIKEY

Stock

6523

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

10000

Min.Order

0

Region

EUROPE Order Now

ARROW

Stock

5000

Min.Order

2500

Region

AMERICA Order Now

MOUSER

Stock

4567

Min.Order

1

Region

WORLDWIDE Order Now

RUTRONIK

Stock

25000

Min.Order

2500

Region

EUROPE Order Now

Distributor reported inventory date: 2019-09-13

Marketing Status

Active

Unit Price (US$)

0.991

Quantity

10000

ECCN (US)

EAR99

Country of Origin

-

(*) 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

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00 Files selected for download

Technical Documentation

    • Description Version Size Action
      DS3330
      2 A switch step down switching regulator
      9.3
      483.8 KB
      PDF
      DS3330

      2 A switch step down switching regulator

    • Description Version Size Action
      AN2823
      Current source for LED driving based on the L5973AD
      1.1
      1.54 MB
      PDF
      AN1723
      Designing with L5973AD high efficiency DC-DC converter
      4.0
      1.09 MB
      PDF
      AN2823

      Current source for LED driving based on the L5973AD

      AN1723

      Designing with L5973AD high efficiency DC-DC converter

    • Description Version Size Action
      DN0011
      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration
      1.2
      361.3 KB
      PDF
      DN0011

      ST1S03 alternative topology: Using a buck in a negative buck-boost configuration

HW Model, CAD Libraries & SVD

    • Description Version Size Action
      X597X Pspice model
      3.64 MB
      ZIP

      X597X Pspice model

Publications and Collaterals

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
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      Switching Converters (DC-DC) – Quick Reference Guide 1.0
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      Electric vehicle (EV) ecosystem

      Switching Converters (DC-DC) – Quick Reference Guide

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 Power

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.