Up to 1.5 A step down switching regulator for automotive applications

The A5973AD is a step-down monolithic power switching regulator with a minimum switch current limit of 1.8 A, so it is able to deliver up to 1.5 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to VIN. The high current level is also achieved thanks to an HSOP8 package with an 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 RDS(on)of 250 mΩ) as a switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 500 kHz. Having a minimum input voltage of 4 V only it fits the automotive applications requiring the device operation even in cold crank conditions. A 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 (see PPAP for more details)
  • 1.5 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 VIN
  • Low dropout operation: 100% duty cycle
  • 500 kHz internally fixed frequency
  • Voltage feed-forward
  • 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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Resources

Technical Documentation

Product Specifications
Description Version Size
Up to 1.5 A step-down switching regulator for automotive applications 9.0 1 MB

HW Model, CAD Libraries & SVD

HW Model, CAD Libraries & SVD
Description Version Size
X597X Pspice model 3 MB

Publications and Collaterals

Flyers
Description Version Size
A798x, A597x switching regulators for car power management 1.0 714 KB
Up to 3 A switching step-down regulators 1.0 739 KB
Brochures
Description Version Size
Brochure Power management guide 09.2017 3 MB
eDesignSuite Support & Community


Sample & Buy

Part Number Package Packing Type Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
A5973AD PowerSO-8 Tube Active 1.425 1000 NEC EAR99 CHINA MORE INFO No availability reported, please contact our Sales office
A5973ADTR PowerSO-8 Tape And Reel Active 1.425 1000 NEC EAR99 CHINA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY
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(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
A5973AD ActivePowerSO-8AutomotiveEcopack2 0 0
A5973ADTR ActivePowerSO-8AutomotiveEcopack2 0 0
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(**) 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.

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