STMicroelectronics

A5970AD

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

Topology: Buck
Input Voltage (min.): 4.00 V
Input Voltage (max.): 36.00 V
Switching Frequency (min.): 430.00 kHz
Switching Frequency (max.): 570.00 kHz
Output 1: 36.00 V / 1.000 A

Original publication on 2013-02-21, revision 5

Description

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.

Characteristics

  •  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

Products

  Order Code SPEC Product series L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(Ω)
RDC max.
(Ω)
fres
(MHz)
Montageart Samples
74456115 PDF WE-PD4 SMT Power Inductor 15 2.9 3.6 0.043 0.06 17 SMT