Up to 1 A step down switching regulator for automotive applications

The A5970AD is a step-down monolithic power switching regulator with a minimum switch current limit of 1.35 A so it is able to deliver up to 1 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to VIN.

The device uses an internal P-channel DMOS transistor (with a typical RDS(on)of 250 mΩ) as 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. 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 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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Technical Documentation

Product Specifications
Description Version Size
DS5812 DS5812: Up to 1 A step down-switching regulator for automotive applications 5.0 992 KB
Application Notes
Description Version Size
AN3288 AN3288: g-Brake Lights: an adaptive rear lighting system based on the AIS326DQ inertial sensor and the STM8AF5168 MCU 2.1 1 MB

HW Model, CAD Libraries & SVD

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

Publications and Collaterals

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
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
A5970ADTR SO-8 Tape And Reel Active 1.363 1000 NEC EAR99 CHINA MORE INFO Get Sample Add to cart DISTRIBUTOR AVAILABILITY

(*) 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**
A5970ADTR ActiveSO-8AutomotiveEcopack2 (**) 0 0
A5970AD ActiveSO-8AutomotiveEcopack2 (**) 0 0

(**) 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.