STMicroelectronics Evaluation board for A5970AD EVALA5970AD EVALA5970AD Data Sheet

This is information on a product in full production. 

March 2014

DocID14661 Rev 5

1/42

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

-

 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 V

IN

 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

 Dedicated to 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 V

IN

. 

The device uses an internal P-channel DMOS 
transistor (with a typical R

DS(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 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.