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RST1S31HF：Up to 4 V, 3 A step-down 2.3 MHz switching regulator for aerospace applications

The RST1S31HF is an internally compensated 2.3 MHz fixed frequency PWM synchronous step-down regulator. The RST1S31HF operates from 2.8 V to 4 V input, while it regulates an output voltage as low as 0.8 V and up to V_IN.

The RST1S31HF device integrates a 70 mΩ high-side switch and a 55 mΩ synchronous rectifier allowing very high efficiency with very low output voltages.

The peak current mode control with internal compensation deliver a very compact solution with a minimum component count.

The large ambient temperature range makes it ideal for aerospace and defense applications.

The RST1S31HF is available in a 3 mm x 3 mm, 8-lead VFDFPN package.

Key Features

• General features
  • 3 A DC output current
  • 2.8 V to 4 V input voltage
  • Large ambient temperature range: -40 °C to 125 °C
  • Output voltage adjustable from 0.8 V
  • 2.3 MHz switching frequency
  • Internal soft-start and enable
  • Integrated 70 mΩ and 55 mΩ power MOSFETs
  • All ceramic capacitor
  • Power Good (POR)
  • Cycle-by-cycle current limiting
  • Current foldback short-circuit protection
  • VFDFPN 3 x 3 - 8L package
• Aerospace and defense features
  • Intended 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 to harsh environment (acceleration, EMI, thermal, humidity)
  • Extended screening capability on request

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