The ISL73847M is a synchronous buck controller that can operate as a single or dual-phase controller. It works with the ISL71441M (half-bridge GaN FET driver) to generate point-of-load voltage rails for commercial space applications.

It accepts an input voltage range of 4.5V to 19V with a programmable PWM output switching frequency between 250kHz and 1.5MHz with a single resistor. The output can regulate a voltage upwards of 600mV and is limited on the top end by the minimum off time and selected switching frequency.

The wide input voltage range makes it a suitable power supply option for a high-current FPGA core and other general-purpose power solutions. The ISL73847M uses current mode modulation, which simplifies loop compensation and provides excellent power supply rejection. Additionally, the output is remotely sensed to compensate for any voltage drop in the load conditions. Together, this results in a robust power supply solution that requires minimal components while achieving high current density.


  • Qualified to Renesas Rad Tolerant Screening and QCI Flow (R34TB0004EU)
  • Wide operating voltage range:
    • Input: 4.5V to 19V
    • Output: 0.6V to V PWR_STAGE ×((TSW -120ns)/TSW)
  • Programmable PWM output switching frequency
    • 250kHz to 1.5MHz
  • Optional droop regulation
  • Current mode control provides
    • Excellent power supply rejection
    • Simplified control scheme
  • Output differential remote sensing
  • Programmable soft-start
  • Enable control
  • Power-good Indicator
  • TID Radiation Lot Acceptance Testing (LDR: ≤0.01rad(Si)/s)
    • ISL73847M30BZ: 30krad(Si)
    • ISL73847M50BZ: 50krad(Si)
  • SEE Characterization
    • No DSEE with VDD = 25V and 43MeV•cm2/mg
    • SEFI <3μm2 at 43MeV•cm2/mg
    • SET <2% on VOUT at 43MeV•cm2/mg




  • FPGA core power supply
  • General purpose power supply


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