Up to 2 A step down switching regulator for automotive applications

Topologie: Buck
Eingangsspannung (min.): 4.00 V
Eingangsspannung (max.): 36.00 V
Schaltfrequenz (min.): 425.00 kHz
Schaltfrequenz (max.): 575.00 kHz
Ausgang 1: 3.30 V / 2.000 A

Erstveröffentlichung am 19.10.2005, Version 1 vom


The A5974AD is a step-down monolithic power switching regulator with a minimum switch current limit of 2.5 A, it is therefore able to deliver up to 2 A DC current 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 also achieved thanks to a HSOP8 package with exposed frame, that allows to reduce the RTHJ-A down to approximately 40 °C/W. The device uses an 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 500 kHz. Having a minimum input voltage of only 4 V, it fits automotive applications requiring 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


  • Qualified following the AEC-Q100requirements (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
  • 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 selection


  Artikel Nr. SPEC Produktserie L
RDC typ.
RDC max.
Version Muster
744771112 PDF WE-PD SMT-Speicherdrossel 12 3.91 4.85 23 27 19.7 Standard

Weitere Anwendungen und Artikel von Würth Elektronik zu diesem IC

  • A5974AD
    Topologie: Buck-Boost, Eingangsspannung (min.): 5.00 V, Eingangsspannung (max.): 5.00 V, Schaltfrequenz (min.): 425.00 kHz, Schaltfrequenz (max.): 575.00 kHz, Ausgang 1: 12.00 V / 0.600 A