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STMicroelectronics A5973AD

Up to 1.5 A step down switching regulator for automotive applications

Overview

TopologyBuck Converter
Input voltage4-36 V
IC revision9

Description

The A5973AD is a step-down monolithic power switching regulator with a minimum switch current limit of 1.8 A, so it is able to deliver up to 1.5 A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 V to VIN. The high current level is also achieved thanks to an HSOP8 package with an exposed frame, that allows to reduce the Rth(JA)down to approximately 40 °C/W. The device uses an internal P-channel DMOS transistor (with a typical RDS(on)of 250 mΩ) as a 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. A pulse-by-pulse current limit with the internal frequency modulation offers an effective constant current short-circuit protection.

Features

  • Qualified following the AEC-Q100
  • requirements (see PPAP for more details) 1.5 A DC output currentOperating 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 shutdownREMARKS:-TABLE 8 INDUCTOR

Typical applications

  • Dedicated to automotive applications

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(Ω)
RDC max.
(Ω)
fres
(MHz)
Mount Samples
74456115
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD4 SMT Power Inductor 15 2.9 3.6 0.043 0.06 17 SMT
74456122
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD4 SMT Power Inductor 22 2.6 3.1 0.071 0.095 14 SMT
74456133
STE ALT EAG CAD LTS PSP SPE IGS CADWE-PD4 SMT Power Inductor 33 2.3 2.6 0.094 0.12 13 SMT
Order Code Data­sheet
74456115
74456122
74456133
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(Ω)
RDC max.
(Ω)
fres
(MHz)
Mount Samples