Overview
Description
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.
Features
- 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
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 1.83 MB | |
| Application Note | PDF 391 KB | |
| Application Note | PDF 351 KB | |
| Technical Brief | PDF 340 KB | |
| Report | PDF 994 KB | |
| Report | PDF 840 KB | |
| Application Note | PDF 224 KB | |
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Design & Development
Software & Tools
Software & Tools
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Software type
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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
Evaluation
ISL73847SEHEV2Z
Active
Rad Hard Single/Dual Phase Current Mode PWM Controller Evaluation Board
The ISL73847SEHEV2Z evaluation board benchmarks the performance of the ISL73847SEH dual-phase buck controller. The evaluation board is optimized for a 4.5V to 15V input operation to generate a 50A max, 1V output. Input and output connections, test points and jumper settings on the board provide...
Recommended Documents:
Demonstration
ISL73847SEHDEMO2Z
Active
Radiation Hardened Compact 12V to 1V, 50A Capable Power Supply
The ISL73847SEHDEMO2Z demonstration board demonstrates the performance of the ISL73847SEH 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
ISLVERSALDEMO2Z
Active
Power Management Reference Design for AMD Versal XQRVC1902
The ISLVERSALDEMO2Z demo board provides the power management for the AMD Xilinx Space Grade Versal ACAP AI Core VC1902 using Renesas' Radiation Hardened Power Management devices. The Versal ACAP system requires various supply rails, including the core, digital, analog, and DDR memory. The...
Recommended Documents:
Demonstration
ISL73847SEHDEMO5Z
Active
Radiation Hardened Compact 12V to 1V, 25A Capable Power Supply
The ISL73847SEHDEMO5Z demonstration board demonstrates the performance of the ISL73847SEH 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:
Evaluation
ISL73847SEHEV3Z
Active
Rad Hard Quad-Phase Current Mode PWM Controller Evaluation Board
The ISL73847SEHEV3Z evaluation board benchmarks the performance of two ISL73847SEH dual-phase buck controllers, four ISL73041SEH GaN half-bridge drivers, and twelve ISL70020SEH 40V GaN FETs in a 4-phase, 100A configuration. It is designed for the VERSAL VC1902 VCCINT core rail.
Recommended Documents:
Demonstration
ISL73847SEHDEMO6Z
Active
Rad Hard Quad-Phase Current Mode PWM Controller Demonstration Board
The ISL73847SEHDEMO6Z demonstration board demonstrates the performance of two ISL73847SEH dual-phase buck controllers, four ISL73041SEH GaN half-bridge drivers, and twelve ISL70020SEH 40V GaN FETs in a 4-phase, 100A configuration. It is designed for the VERSAL VC1902 VCCINT core rail.
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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