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  • The B5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2.25 A so it is able to deliver up to 2 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 HSOP8 package (i.e. SO8 package with exposed frame), that allows to reduce the Rth(JA)down to approximately 40 °C/W. The device uses an internal P-channel DMOS transistor (with a typical RDSonof 250 mΩ) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. Having a minimum input voltage of 4 V only, it is particularly suitable for 5 V bus. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short-circuit protection.

    Key Features

    • Qualified following the AEC-Q100 requirements (temperature Grade 1), see PPAP for more details.
    • 2 A DC output current
    • Operating input voltage from 4 V to 36 V
    • 3.3 V / (± 2 %) reference voltage
    • Output voltage adjustable from 1.235 V to 35 V
    • Low dropout operation: 100 % duty cycle
    • 250 kHz internally fixed frequency
    • Voltage feedforward
    • Zero load current operation
    • Internal current limiting
    • Inhibit for zero current consumption
    • Synchronization
    • Protection against feedback disconnection
    • Thermal shutdown

Circuit Diagram

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Technical Documentation

    • Description Version Size Action
      DS5575
      2 A step down switching regulator for automotive applications
      4.0
      1.63 MB
      PDF
      DS5575

      2 A step down switching regulator for automotive applications

    • Description Version Size Action
      TN1224
      Mounting instructions for SMD (surface mounting device) packages
      2.2
      1.06 MB
      PDF
      TN1224

      Mounting instructions for SMD (surface mounting device) packages

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
      A798x, A597x switching regulators for car power management 1.0
      714.2 KB
      PDF

      A798x, A597x switching regulators for car power management

    • Description Version Size Action
      Electric vehicle (EV) ecosystem 1.1
      1.28 MB
      PDF

      Electric vehicle (EV) ecosystem

Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
B5973D
Active
PowerSO-8 Automotive Ecopack2
B5973DTR
Active
PowerSO-8 Automotive Ecopack2

B5973D

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

Grade

Automotive

RoHS Compliance Grade

Ecopack2

B5973DTR

Package:

PowerSO-8

Material Declaration**:

PDF XML

Marketing Status

Active

Package

PowerSO-8

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.

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.

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
B5973DTR Available at 2 distributors

Distributor availability ofB5973DTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 470 1 Order Now
MOUSER WORLDWIDE 82 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

470

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

82

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-10

Sample & Buy Buy now
Active
EAR99 NEC Tape And Reel PowerSO-8 -40 125 PHILIPPINES 1.875 / 1k
B5973D No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tube PowerSO-8 -40 125 PHILIPPINES 1.875 / 1k

B5973DTR

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.875 / 1k

Distributor availability ofB5973DTR

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 470 1 Order Now
MOUSER WORLDWIDE 82 1 Order Now

Distributor reported inventory date: 2020-08-10

Distributor Name

DIGIKEY

Stock

470

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

82

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-08-10

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

PowerSO-8

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

1.875 / 1k

Country of Origin

PHILIPPINES

B5973D

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

1.875 / 1k

ECCN (EU)

NEC

Packing Type

Tube

Package

PowerSO-8

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

1.875 / 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