Overview
Description
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.
Features
- 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
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 2.57 MB | |
| Application Note | PDF 391 KB | |
| Application Note | PDF 351 KB | |
| Technical Brief | PDF 356 KB | |
| Application Note | PDF 224 KB | |
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Design & Development
Software & Tools
Software & Tools
| Software title
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Software type
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Company
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| 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.
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Simulator | Renesas |
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Boards & Kits
Demonstration
ISL73847MDEMO1Z
Active
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 operation to generate a 50A max, 1V output.
Recommended Documents:
Demonstration
ISL73847MDEMO2Z
Active
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 to 15V input operation to generate a 25A max, 1V output.
Recommended Documents:
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
Product Options
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