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

Topologie: Boost
Eingangsspannung (min.): 12.00 V
Eingangsspannung (max.): 12.00 V
Schaltfrequenz (min.): 212.00 kHz
Schaltfrequenz (max.): 280.00 kHz
Ausgang 1: 36.00 V / 0.350 A

Erstveröffentlichung am 20.02.2013, Version 1 vom


The R5974D 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 mΩ) as a switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250 kHz. The largeambient temperature range makes it ideal for aerospace and defense applications. A pulse-bypulse current limit with the internal frequencymodulation offers an effective constant current short-circuit protection.


  • General features
  • 2.5 A DC output current
  • Operating input voltage from 4 V to 36 V
  • 3.3 V / (± 2%) reference voltage
  • Large ambient temperature range:40 °C to 125 °C
  • 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 shutdown
  • Aerospace and defense features
  • Suitable for use in aerospace and defense applications
  • Dedicated traceability and part marking
  • Production parts approval documents available
  • Adapted extended life time andobsolescence management
  • Extended product change notification process
  • Designed and manufactured to meet subppm quality goals
  • Advanced mold and frame designs for superior resilience in harsh environments (acceleration, EMI, thermal, humidity)
  • Extended screening capability on requestRemarks:
  • For Inductor value 15uH, general values of O/P vlotage, O/P current is taken


  Artikel Nr. SPEC Produktserie L
RDC typ.
RDC max.
Version Muster
7447786122 PDF WE-PD SMT-Speicherdrossel 22 2 1.3 98 115 15 Robust

Weitere Anwendungen und Artikel von Würth Elektronik zu diesem IC

  • R5974D
    Topologie: Other, Schaltfrequenz (min.): 212.00 kHz, Schaltfrequenz (max.): 280.00 kHz