Overview
Description
The ISL73847SLH is a synchronous buck controller that can operate as a single or dual-phase controller. It works with the ISL71441SLH (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 ISL73847SLH features built-in current sharing, enabling two-phase operation within a single device and four-phase operation using two ISL73847SLH devices, all without requiring an external clock at ≤ 1.04MHz. For multi-phase operation at other frequencies, the ISL74420 provides additional scalability, making it a flexible solution for multi-phase power architectures.
Its wide input voltage range makes it ideal for high-current FPGA core power and general-purpose power applications. The current mode modulation architecture simplifies loop compensation, enhances power supply rejection, and supports remote sensing to compensate for voltage drops under load. These features deliver a high-density, robust power solution that minimizes external components while ensuring efficient and reliable performance.
The ISL73847SLH also features a tri-level output that provides excellent protection against faults by driving a mid-scale voltage to signal the power stage to enter a Hi-Z condition.
The ISL73847SLH operates across the military temperature range from -55°C to +125°C and is available in a 24 Ld WSOIC plastic package.
Features
- Qualified to Renesas rad hard QML-P equivalent screening and QCI flow (R34TB0005EU)
- All screening and QCI are in accordance with MIL-PRF-38535L Class-P
- Wide operating voltage range:
- Input: 4.5V to 19V
- Output: 0.6V to VPWR_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 rad hard assurance (RHA) wafer-by-wafer testing
- LDR (0.01rad(Si)/s): 75krad(Si)
- SEE characterization
- No DSEE with VDD = 25V and 86MeV•cm2/mg
- SEFI
Comparison
Applications
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
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:
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
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:
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.
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