The ISL73847SEH is a synchronous buck controller that can operate as a single or dual-phase controller. It is intended to work with the ISL73041SEH (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 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 of 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 ISL73847SEH 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. All of this put together results in a robust power supply solution that requires minimal components while achieving high current density.

The ISL73847SEH also features a tri-level output which provides excellent protection against faults by driving a mid-scale voltage to signal the power stage to enter a Hi-Z condition.

The ISL73847SEH operates across the military temperature range from -55 °C to +125 °C and is available in a 24 Ld hermetically sealed Ceramic Dual Flatpack (CDFP) package or in die form.


  • Wide operating voltage range:
    • Input: 4.5V to 19V
    • Output: 0.6V to VPWR_STAGE×((TSW-120ns)/TSW)
  • Programmable 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
  • Radiation acceptance testing
    • LDR (0.01rad(Si)/s): 75krad(Si)
  • SEE hardness (see SEE report for details)
    • No SEB/SEL LETTH, VDD = 25V: 86MeV•cm2/mg
    • SET/SEFI free at LET 86MeV•cm2/mg
  • Qualified to Renesas Rad Hard QML-V Equivalent Screening and QCI flow (R34TB0001EU)
    • All screening and QCI is in accordance with MIL-PRF- 38535L Class-V




  • FPGA core power supply
  • General purpose power supply


Type Title Date
Datasheet PDF 1.83 MB
Technical Brief PDF 340 KB
Application Note PDF 340 KB
Application Note PDF 357 KB
Report PDF 994 KB
Brochure PDF 4.85 MB
Application Note PDF 414 KB
Report PDF 840 KB
White Paper PDF 533 KB
9 items

Design & Development

Software & Tools

Software & Tools

Software title
Software type
iSim:PE Offline Simulation Tool
iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.
Simulator Renesas
1 item

Software Downloads

Type Title Date
Software & Tools - Other XLSX 308 KB
Software & Tools - Other XLSX 336 KB
Software & Tools - Other XLSX 742 KB
3 items

Boards & Kits

Boards & Kits