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R5973AD：Up to 1.5 A step down switching regulator for aerospace applications

The R5973AD 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 V_IN. The high current level is also achieved thanks to an HSOP8 package with an exposed frame, that allows to reduce the R_th(JA)down to approximately 40 °C/W. The device uses an internal P-channel DMOS transistor (with a typical R_DS(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. The large ambient temperature range makes it ideal for aerospace and defense applications. A pulse-by-pulse current limit with the internal frequency modulation offers an effective constant current short-circuit protection.

Key Features

• General features
  • 1.5 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 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 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 and obsolescence management
  • Extended product change notification process
  • Designed and manufactured to meet sub-ppm quality goals
  • Advanced mold and frame designs for superior resilience in harsh environments (acceleration, EMI, thermal, humidity)
  • Extended screening capability on request

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