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STMicroelectronics A5974D

Up to 2.5 A step-down switching regulator for automotive applications

Overview

TopologyBuck Converter
Input voltage4-36 V
IC revision2

Description

The A5974D is a step-down monolithic power switching regulator with a minimum switch current limit of 3.1 A, so it is able to deliver up to 2.5 A DCcurrent to the load depending on the application conditions. The output voltage can be set from 1.235 V to 35 V. The high current level is alsoachieved thanks to an HSOP8 package with an exposed frame, that allows to reduce the Rth(JA) down to approximately 40 °C/W. The device usesan internal P-channel DMOS transistor (with a typical RDS(on) of 250 m) as a switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 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 pulseby-pulse current limit with the internal frequency modulation offers an effective constant current short-circuit protection.

Features

 Qualified following the AEC-Q100requirements (see PPAP for more details)

  • 2.5 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 35 V
  • Low dropout operation: 100% duty cycle
  • 250 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 shutdownREMARKS:-TABLE 8.INDUCTOR SELECTION

Typical applications

  • Dedicated to automotive applications

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
74477008
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 0.75 19.8 21 3 4 110 1280 Standard
74477004
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 4.7 8.5 9.3 12 16 31.2 1280 Standard
74477006
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 6.1 7.6 8.6 15 18 25 1280 Standard
74477110
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 10 5 5.5 18 25 21.5 1260 Standard
744771115
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 15 3.75 4.55 25 30 16.6 1260 Standard
744771118
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 18 3.48 4.3 29 34 15 1260 Standard
744771122
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 22 3.37 3.77 31 36 13.5 1260 Standard
744771127
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 27 2.97 3.55 40 51 12 1260 Standard
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples