Renesas ISL70003ASEHVFE

Overview

ISL70003ASEHVFE from Renesas Electronics is a radiation-hardened, 3V–13.2V input, 9A synchronous buck regulator with voltage-mode control, selectable 300kHz/500kHz switching frequency, and integrated 31mΩ PFET / 21mΩ NFET MOSFETs. It delivers ±1% reference accuracy over line, temperature, and 50–100 krad(Si) TID, supports monotonic start-up into pre-biased loads, and powers FPGA core/I/O rails in space-grade systems.

For engineers reviewing the ISL70003ASEHVFE datasheet, ISL70003ASEHVFE pinout, ISL70003ASEHVFE application, or ISL70003ASEHVFE equivalent, key selection criteria include its DLA SMD 5962-14203 screening, 50krad(Si) LDR/100krad(Si) HDR radiation assurance, IMON current-monitoring output, DDR2/3/4-compatible VREF buffer, and dual logic-level disable (SEL1/SEL2) for dynamic power-block scaling.

Technical Context

The ISL70003ASEHVFE implements voltage-mode PWM control with feed-forward compensation, enabling stable regulation across wide input ranges while maintaining constant modulator gain via RT/CT network tuning. Its architecture integrates ten independent power blocks (PVINx/LXx/PGNDx), each with dedicated gate drive and current sensing, supporting scalable output current from 0.9A to 9A via SEL1/SEL2 configuration.

It features dual-loop protection: analog overcurrent detection via OCSETA/OCSETB resistors sets precise current limits, while digital fault monitoring includes PGOOD with ±11% output window, POR_VIN-based enable with 0.6V threshold and programmable hysteresis, and SEE-hardened design validated to LET_TH = 86.4 MeV·cm²/mg for SET (<±3% ΔV_OUT) and SEFI (60 MeV·cm²/mg).

Key Specifications

Pinout & Package

ISL70003ASEHVFE is housed in a 64-lead CQFP package (R64.C) with exposed heatsink and grounded lid for EMI suppression and thermal management. The package meets MIL-STD-883 Class B screening and includes ESD protection on all pins per JESD22-A115-A (200V MM) and JESD22-C101D (750V CDM).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck regulator applications.

Compared with ISL70003SEHVFE and ISL75051ASEH, the ISL70003ASEHVFE uniquely combines 9A multi-phase scalability, integrated DDR VREF buffering, and IMON telemetry-enabling consolidated power architecture for complex rad-hard SoCs without external support circuitry.

Availability

ISL70003ASEHVFE is available at Aetrix Electronics and suitable for aerospace power distribution, radiation-hardened FPGA core supplies, and DDR memory termination requiring stable component supply across extended mission lifetimes.

Supply support for ISL70003ASEHVFE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and aerospace markets.

The ISL70003ASEHVFE belongs to Renesas' Space & Hi-Rel Power portfolio, engineered specifically for radiation-tolerant DC-DC conversion in satellites, launch vehicles, and planetary exploration systems.

FAQ

What is the maximum output current rating of the ISL70003ASEHVFE at junction temperature ≤+125°C?

The ISL70003ASEHVFE delivers up to 9A continuous output current when junction temperature remains at or below +125°C. This rating assumes proper thermal management using the exposed heatsink pad and adherence to recommended PCB layout guidelines per datasheet Section 13. Derating applies above this temperature, dropping to 6A at T_J ≤ +150°C.

How does the ISL70003ASEHVFE support DDR memory applications?

The ISL70003ASEHVFE supports DDR memory applications through its integrated buffer amplifier (BUFIN+/BUFIN−/BUFOUT), which generates a precise VTT voltage equal to half the VDDQ rail. It is compatible with DDR2, DDR3, and DDR4 standards and maintains <±3% ΔV_OUT under heavy-ion exposure at LET = 86.4 MeV·cm²/mg, satisfying JEDEC termination tolerance requirements.

What package type and thermal characteristics does the ISL70003ASEHVFE use?

The ISL70003ASEHVFE uses a 64-lead CQFP package (R64.C) with an exposed metal heatsink on the underside. Its thermal resistance is θ_JA = 17°C/W (free-air) and θ_JC = 0.7°C/W (junction-to-case), enabling efficient heat transfer to a PCB thermal plane. The grounded lid also suppresses EMI and prevents charge buildup in radiation environments.

Can the ISL70003ASEHVFE operate with a pre-biased output voltage?

Yes, the ISL70003ASEHVFE supports monotonic start-up into pre-biased loads. Its control architecture prevents reverse current flow and output voltage overshoot during startup, ensuring safe and predictable behavior when powering systems with charged output capacitors-critical for hot-swap and redundancy-switching applications in spacecraft power systems.

What radiation hardness specifications apply to the ISL70003ASEHVFE?

The ISL70003ASEHVFE is electrically screened to DLA SMD 5962-14203 and acceptance tested to 50krad(Si) LDR. It achieves TID Rad Hard Assurance (RHA) with 100krad(Si) HDR (50–300 rad(Si)/s) and 50krad(Si) LDR (<0.01 rad(Si)/s). SEE characterization confirms DSEE LET_TH = 86.4 MeV·cm²/mg and SEFI LET_TH = 60 MeV·cm²/mg.