Overview

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.

ISL73847M Functional Block Diagram
ISL73847M Functional Block Diagram
  • 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

Applications

  • FPGA core power supply
  • General purpose power supply

Documentation

= Featured Documentation
Type Title Date
Datasheet
ISL73847M Datasheet
PDF 2.57 MB
Technical Brief
R34TB0004: Renesas Radiation Tolerant Plastic Screening and QCI Flow
PDF 356 KB
Brochure
Intersil Space Products Brochure
PDF 4.85 MB
3 items

Design & Development

Software Downloads
Type Title Date
Software & Tools - Other
ISL73847x Design Tool
XLSX 308 KB
Software & Tools - Other
ISL71441M Design Calculator
XLSX 336 KB
Software & Tools - Other
ISL73847x Power Loss and Efficiency Estimator
XLSX 742 KB
3 items

Boards & Kits

ISL73847MDEMO1Z Demonstration Board

ISL73847MDEMO1Z

Demonstration
Learn More

Radiation Tolerant Compact Dual Phase 12V to 1V, 50A Capable Power Supply Demonstration Board

The ISL73847MDEMO1Z demonstration board demonstrates the performance of the ISL73847M dual-phase buck controller. The board is optimized for a 4.5V to 15V input...

Featured Documents:
ISL73847MDEMO1Z Demonstration Board Manual
ISL73847MDEMO2Z Demonstration Board

ISL73847MDEMO2Z

Demonstration
Learn More

Radiation Tolerant Compact Single Phase 12V to 1V, 25A Capable Power Supply Demonstration Board

The ISL73847MDEMO2Z demonstration board demonstrates the performance of the ISL73847M dual-phase buck controller in single-phase mode. The board is optimized for a 4.5V...

Featured Documents:
ISL73847MDEMO2Z Evaluation Board Manual

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Diagram of ECAD Models

Product Options

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    Pkg. Type
    Carrier Type
    MOQ
    Moisture Sensitivity Level (MSL)
    Buy / Sample
    Part Number
    ISL73847M30BZ
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    		SOICW Tray 25 1
    ISL73847M50BZ
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    		SOICW Tray 25 1
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