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IC manufacturers STMicroelectronics

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STMicroelectronics A5970AD

Up to 1 A step down-switching regulator for automotive applications


TopologyBuck Converter
Input voltage4-36 V
Switching frequency430-570 kHz
Output 136 V / 1 A
IC revision5


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 DCcurrent 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 m) 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 applicationsrequiring the device operation even in cold crank conditions. Pulse by pulse current limit with the internal frequency modulation offers an effectiveconstant current short-circuit protection.


 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

Typical applications

  • Dedicated to automotive applications