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Renesas ISL70003ASEHVX
- Part No.:
- ISL70003ASEHVX
- Manufacturer:
- Renesas
- Package:
- 64-BCQFP Exposed Pad
- Datasheet:
-
ISL70003ASEHVX.pdf
- Description:
- IC REG BUCK ADJ 9A 64CQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,269
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Product details
Overview
ISL70003ASEHVX from Renesas Electronics is a radiation-hardened, 3V–13.2V input, 9A synchronous buck regulator with voltage-mode control, integrated 31mΩ PFET/21mΩ NFET MOSFETs, and DDR memory support including VREF buffer and VTT tracking. It delivers ±1% reference accuracy over line, temperature, and 50–100 krad(Si) TID, operates from –55°C to +125°C ambient, and supports monotonic start-up into pre-biased loads for FPGA core and I/O power.
For engineers reviewing the ISL70003ASEHVX datasheet, ISL70003ASEHVX pinout, ISL70003ASEHVX application, or ISL70003ASEHVX equivalent, key selection criteria include its rad-hard assurance (HDR/LDR), IMON current monitoring, dual-disable logic (SEL1/SEL2), adjustable soft-start (2–200 ms), and DDR2/3/4 compatibility with VREF buffer and VTT regulation.
Technical Context
The ISL70003ASEHVX implements voltage-mode PWM control with feed-forward compensation, selectable 300 kHz or 500 kHz switching via FSEL, and externally adjustable Type III loop compensation between FB and VERR pins. Its architecture supports synchronization via SYNC and enables phase disable via SEL1/SEL2 to dynamically scale active power blocks for efficiency optimization across load ranges.
It integrates a dedicated DDR buffer amplifier (BUFIN+/BUFIN−/BUFOUT) with 1.0 µF minimum load capacitance, supports diode emulation for light-load efficiency, and features IMON current-sense output proportional to output current. Radiation hardening includes TID RHA testing (100 krad HDR, 50 krad LDR) and SEE characterization (DSEE LETTH = 86.4 MeV·cm²/mg).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 13.2V - supports wide intermediate bus rails including 5V, 12V, and 3.3V systems without external regulators. |
| Max Output Current | 9A at TJ ≤ +125°C - sufficient for high-density FPGA/CPU core supplies with thermal derating to 6A at +150°C junction. |
| Output Voltage Range | 0.6V to ~90% of VIN - enables precise low-voltage DDR VDDQ (1.2V, 1.8V, 2.5V) and VTT (0.6V, 1.25V) generation. |
| Reference Accuracy | ±1% over line, temperature, and radiation - ensures stable regulation under space-grade environmental stress and thermal cycling. |
| Switching Frequency | Selectable 300 kHz or 500 kHz - balances EMI performance and inductor size; supports external sync via SYNC pin. |
| Radiation Hardness | 50 krad(Si) LDR / 100 krad(Si) HDR - qualified per DLA SMD 5962-14203 with wafer-level acceptance testing. |
| IMON Output | Current-source proportional to output current - enables real-time load monitoring and system-level fault diagnostics without shunt resistors. |
Pinout & Package
The ISL70003ASEHVX is housed in a 64-lead CQFP package with heatsink option (R64.C), featuring exposed metal lid electrically connected to PGNDx and HS pin (Pin 50) for direct thermal plane attachment. Thermal resistance is θJA = 17°C/W and θJC = 0.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NI, FB, VERR | Error amplifier inputs/output | Enable precision feedback loop with external Type III compensation; NI connects to REF for standard use or BUFOUT for DDR mode. |
| PVINx (Pins 23,28,32,37,38,43,44,49,53,58) | Power input for internal power blocks | 10 independent high-current inputs tied to common input rail; require local ceramic bypassing to respective PGNDx pins. |
| LXx (Pins 24,27,33,36,39,42,45,48,54,57) | Switch node outputs | 10 synchronous switch nodes driving external inductors; each paired with dedicated PGNDx and PVINx for optimal current path routing. |
| PGNDx (Pins 25,26,34,35,40,41,46,47,55,56) | Power ground per phase | 10 isolated power grounds tied to PCB ground plane and capacitor negative terminals; lid internally connected to PGNDx. |
| SEL1/SEL2 (Pins 29,30) | Phase enable/disable logic | 2-bit input controlling number of active power blocks (1–10 phases); enables dynamic efficiency scaling based on real-time load demand. |
| BUFIN+, BUFIN−, BUFOUT (Pins 61,62,63) | DDR reference buffer | Unity-gain amplifier generating VREF for DDR memory; BUFOUT drives VREF input, BUFIN+ accepts VTT, BUFIN− provides feedback for VTT = VDDQ/2 tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Rad-hard assurance | Electrically screened to DLA SMD 5962-14203; TID tested at 50–100 krad(Si) with full SEE characterization (SET < ±3% ΔVOUT at LET = 86.4 MeV·cm²/mg). |
| Adjustable analog soft-start | 2–200 ms ramp time set by SS_CAP capacitor (82 nF–8.2 µF); prevents inrush current and ensures monotonic start-up into pre-biased loads. |
| Diode emulation mode | Discontinuous conduction at light loads via DE pin control; improves light-load efficiency without requiring external diodes or complex control schemes. |
| VREF buffer for DDR | Dedicated unity-gain amplifier with 1.0 µF minimum load capacitance; supports DDR2/3/4 VREF generation and VTT tracking (VTT = VDDQ/2) with <1% error. |
| IMON current monitoring | Proportional current-source output referenced to VREFA; eliminates need for sense resistors and associated power loss in high-current applications. |
Applications
| FPGA Core Power Supply | DDR Memory Power System |
|---|---|
Use Scenario: Powering Xilinx or Microsemi rad-tolerant FPGAs in satellite payload processors where supply stability and radiation immunity are critical. IC Role / Device Role / Timing Role: Primary point-of-load (POL) buck regulator delivering tightly regulated 1.0V–1.2V core voltage with ±1% accuracy across –55°C to +125°C. Use Value: Eliminates external linear post-regulators; achieves >95% peak efficiency at 9A while maintaining regulation under 100 krad(Si) total ionizing dose. | Use Scenario: Generating matched VDDQ and VTT rails for DDR3/DDR4 memory subsystems in radiation-hardened avionics computers. IC Role / Device Role / Timing Role: Dual-rail controller using internal buffer amplifier to generate VREF and track VTT = VDDQ/2 with sub-1% error across temperature and radiation exposure. Use Value: Reduces component count by integrating VREF buffer and phase disable logic; supports JEDEC-compliant DDR termination without external op-amps or references. |
| High-Density Distributed Power | Space-Qualified CPU I/O Supply |
Use Scenario: Compact POL solution for multi-rail power distribution in SWaP-constrained spacecraft subsystems with strict mass and volume limits. IC Role / Device Role / Timing Role: 10-phase interleaved buck converter enabling low-output-ripple, high-current delivery from a single IC footprint. Use Value: Achieves ripple cancellation through phase interleaving; reduces required output capacitance by up to 70% versus single-phase designs at same output current. | Use Scenario: Providing 3.3V I/O supply to rad-hard ARM-based SoCs in deep-space rover command modules operating beyond Earth's magnetosphere. IC Role / Device Role / Timing Role: High-efficiency buck regulator with PGOOD monitoring and IMON telemetry for autonomous health reporting in unattended missions. Use Value: Enables closed-loop system monitoring via IMON output and fault detection via PGOOD open-drain signal, supporting fault-tolerant software recovery protocols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL70003SEHVX | Original version with 7A max output (TJ ≤ +125°C) and looser load regulation (0.5% typical vs. 0.3% typical). | Lacks enhanced radiation margin and tighter DC accuracy; not qualified for 100 krad HDR testing. | Acceptable for lower-dose missions or non-critical subsystems where cost sensitivity outweighs extended rad-hard margin. |
| ISL75051ASEHVX | Single-phase 5A rad-hard buck; no DDR buffer, no IMON, no multi-phase control; smaller 48-pin CQFP package. | Targeted at simpler point-of-load needs without VTT/VREF generation or current telemetry requirements. | Preferred for space-qualified microcontrollers or sensors where only basic 3.3V/5V regulation is needed and board area is constrained. |
Compared with ISL70003SEHVX and ISL75051ASEHVX, the ISL70003ASEHVX delivers higher current (9A), tighter regulation (0.3%), full DDR support, and integrated current monitoring-making it uniquely suited for high-reliability FPGA and memory power in extreme radiation environments.
Availability
ISL70003ASEHVX is available at Aetrix Electronics and suitable for FPGA core supplies, DDR memory power systems, and high-density distributed power architectures requiring stable component supply across extended temperature and radiation-exposed operational lifetimes.
Supply support for ISL70003ASEHVX 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 management, and radiation-hardened ICs for aerospace, defense, and industrial markets.
The ISL70003ASEHVX belongs to Renesas' Space & Harsh Environment Analog Power portfolio, designed specifically to replace legacy discrete or hybrid POL solutions in mission-critical satellite, launch vehicle, and planetary exploration systems.
FAQ
What is the maximum output current rating of the ISL70003ASEHVX at +125°C junction temperature?
The ISL70003ASEHVX delivers up to 9A continuous output current when junction temperature remains at or below +125°C. This rating assumes proper PCB thermal design with heatsink attachment via the HS pin (Pin 50) and adherence to recommended layout guidelines in the datasheet. Derating to 6A applies above +125°C up to +150°C junction.
Does the ISL70003ASEHVX support DDR4 memory power requirements including VTT and VREF generation?
Yes, the ISL70003ASEHVX supports DDR4 via its integrated buffer amplifier (Pins 61–63). It generates precise VREF and enables VTT = VDDQ/2 tracking with <1% error across temperature and radiation exposure. Application schematics in the datasheet confirm operation at 1.2V VDDQ and 0.6V VTT for DDR4 compliance.
How is radiation hardness verified for the ISL70003ASEHVX, and what test levels apply?
The ISL70003ASEHVX is electrically screened to DLA SMD 5962-14203 and acceptance tested to 50 krad(Si) LDR wafer-by-wafer. TID RHA testing confirms 100 krad(Si) HDR capability. SEE characterization includes DSEE LETTH = 86.4 MeV·cm²/mg and SET-induced ΔVOUT < ±3% at that LET level-fully documented in the official ISL70003ASEHVX SEE report.
Can the ISL70003ASEHVX be configured for single-phase operation, and how is phase count controlled?
Yes, the ISL70003ASEHVX supports 1–10 active phases via logic-level inputs SEL1 and SEL2 (Pins 29–30). These pins form a 2-bit code selecting the number of enabled LXx/PVINx/PGNDx power blocks. For single-phase use, tie SEL1 = SEL2 = GND; all 10 phases activate when both are high.
What is the function of the IMON pin on the ISL70003ASEHVX, and how is it used in system design?
The IMON pin (Pin 51) provides a current-source output proportional to output current, eliminating the need for external sense resistors. In system design, IMON can be tied to VREFA if unused, or routed to an ADC input for real-time load telemetry. Its design value lies in enabling accurate current monitoring without added power loss or board space.
ISL70003ASEHVX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-BCQFP Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 13.2V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 11.9V
- Current - Output:
- 9A
- Frequency - Switching:
- 300kHz or 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-CQFP (14.15x14.15)
ISL70003ASEHVX FAQ
1.How can I place an order for ISL70003ASEHVX through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL70003ASEHVX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL70003ASEHVX reliable?
The price and inventory of ISL70003ASEHVX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL70003ASEHVX is usually 5 days.
3.What payment methods are accepted for ISL70003ASEHVX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL70003ASEHVX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL70003ASEHVX?
ISL70003ASEHVX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL70003ASEHVX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL70003ASEHVX?
For technical support, including ISL70003ASEHVX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL70003ASEHVX requirements.
6.How does Aetrix verify that ISL70003ASEHVX is sourced from the original manufacturer or authorized distributors?
All ISL70003ASEHVX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL70003ASEHVX meets industry standards.
7.What is the process for return or replacement of ISL70003ASEHVX?
All ISL70003ASEHVX units undergo pre-shipment inspection (PSI). If there is an issue with ISL70003ASEHVX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL70003ASEHVX part is unused and in its original packaging.
Return procedure for ISL70003ASEHVX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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