Up to 2 A step-down switching regulator for automotive applications

Topologie: Buck
Eingangsspannung (min.): 4.00 V
Eingangsspannung (max.): 36.00 V


The A5973D is a step-down monolithic power switching regulator with a minimum switch current limit of 2.25 A so it is able to deliver up to 2 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 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 mΩ) as 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 applicationsrequiring 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.


  • Qualified following the AEC-Q100
  • requirements (see PPAP for more details)
  • 2 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:-Table8.Inductor selection


  Artikel Nr. SPEC Produktserie L1
IR 1
RDC1 typ
RDC1 max.
fres 1
Montageart Muster
74456133 PDF WE-PD4 SMT-Speicherdrossel 33 2.3 2.6 0.094 0.12 13 SMT
74456122 PDF WE-PD4 SMT-Speicherdrossel 22 2.6 3.1 0.071 0.095 14 SMT
74456115 PDF WE-PD4 SMT-Speicherdrossel 15 2.9 3.6 0.043 0.06 17 SMT