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Renesas ISL70003ASEHX/SAMPLE
- Part No.:
- ISL70003ASEHX/SAMPLE
- Manufacturer:
- Renesas
- Package:
- Die
- Datasheet:
-
ISL70003ASEHX/SAMPLE.pdf
- Description:
- IC REG BUCK ADJ 9A DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
ISL70003ASEHX/SAMPLE from Renesas Electronics is a radiation-hardened, monolithic synchronous buck regulator with voltage-mode control, 3.0V–13.2V input range, externally adjustable 0.6V–~90% VIN output, and 9A continuous load current at TJ ≤+125°C. It integrates 31mΩ PFET and 21mΩ NFET MOSFETs, supports DDR2/3/4 VTT tracking, and features IMON current monitoring and diode emulation for light-load efficiency in space-grade FPGA and memory power systems.
For engineers reviewing the ISL70003ASEHX/SAMPLE datasheet, ISL70003ASEHX/SAMPLE pinout, ISL70003ASEHX/SAMPLE application, or ISL70003ASEHX/SAMPLE equivalent, this page delivers verified radiation-hardened buck regulator specifications, validated 64-pin CQFP pin functions, DDR-specific buffer amplifier operation, TID RHA test data (100krad(Si) HDR), and real-world soft-start, overcurrent, and synchronization implementation details.
Technical Context
The ISL70003ASEHX/SAMPLE implements voltage-mode PWM control with feed-forward compensation, selectable 300kHz/500kHz switching via FSEL pin, and externally adjustable Type III loop compensation between FB and VERR pins. Its dual-disable logic (SEL1/SEL2) enables dynamic phase shedding across up to ten integrated power blocks (LX1–LX10).
Radiation tolerance is achieved through DLA SMD 5962-14203 electrical screening, wafer-level 50krad(Si) LDR acceptance testing, ±1% reference voltage stability over line/temperature/radiation, and SEE characterization including DSEE LETTH of 86.4MeV·cm²/mg and SEFI LETTH of 60MeV·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 pre-regulation. |
| Output Current | 9A continuous at TJ ≤+125°C - sufficient for high-density FPGA core or DDR4 VDDQ supply with thermal derating above 125°C junction. |
| Output Voltage Range | 0.6V to ~90% of VIN - enables direct generation of 1.2V DDR4, 1.8V I/O, and 2.5V DDR3 rails from common input sources. |
| Switching Frequency | Selectable 300kHz or 500kHz - balances EMI suppression (lower freq) against component size and transient response (higher freq). |
| Radiation Hardness | TID RHA: 100krad(Si) HDR / 50krad(Si) LDR - qualified for long-duration missions in GEO, MEO, and deep-space environments. |
| Efficiency | 95% peak - achieved via integrated low-rDS(ON) MOSFETs (31mΩ/21mΩ) and diode emulation mode for sub-1A loads. |
| Reference Accuracy | ±1% over line, temperature, and radiation - ensures stable regulation under extreme thermal cycling and ionizing dose exposure. |
Pinout & Package
ISL70003ASEHX/SAMPLE is housed in a 64-lead Ceramic Quad Flat Pack (CQFP) with heatsink option (R64.C package), featuring exposed metal lid electrically connected to PGNDx and HS pin (Pin 50) for direct thermal plane attachment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| NI (Pin 1) | Error amplifier non-inverting input | Connected to REF for standard regulation; tied to BUFOUT in DDR applications to enable VREF tracking. |
| FB (Pin 2) | Error amplifier inverting input | Kelvin-connected to output inductor node for precise feedback; interfaces with external Type III compensation network. |
| VERR (Pin 3) | Error amplifier output | Drives external compensation components; sets loop dynamics for stability and transient response optimization. |
| PVINx (Pins 23,28,32,37,38,43,44,49,53,58) | Power input per phase | 10 independent inputs feeding internal power blocks; must be tied to common 3V–13.2V rail with local ceramic bypassing to PGNDx. |
| LXx (Pins 24,27,33,36,39,42,45,48,54,57) | Switch node per phase | Connects directly to output inductors; each drives one synchronous buck stage in multi-phase configuration. |
| PGNDx (Pins 25,26,34,35,40,41,46,47,55,56) | Power ground per phase | Direct connection point for input/output capacitor negatives and PCB ground plane; lid internally bonded to PGNDx. |
| OCSETA/B (Pins 59,60) | Overcurrent threshold setting | Resistor-to-ground sets primary (OCSETB) and redundant (OCSETA) current limit thresholds for fault protection. |
| BUFOUT/BUFIN+/BUFIN− (Pins 63,61,62) | DDR reference buffer | Generates precise VREF for DDR termination; BUFIN− tied to BUFOUT in unity-gain follower mode for VTT = VDDQ/2 tracking. |
Key Features
| Feature | Design Value |
|---|---|
| Monotonic start-up into pre-biased load | Ensures safe power sequencing when powering downstream circuits already holding residual voltage on output rail. |
| Adjustable analog soft-start (2ms–200ms) | SS_CAP pin accepts 82nF–8.2µF capacitor to control output ramp rate and prevent inrush-induced system reset. |
| IMON current-sense output | Proportional current source enables real-time output current monitoring without shunt resistor losses or board area. |
| Diode emulation mode | Disables synchronous rectification at light loads to eliminate reverse inductor current and improve efficiency below ~1A. |
| Grounded lid construction | Eliminates charge accumulation in space radiation environments, preventing electrostatic discharge damage during mission life. |
| DDR2/3/4 compatibility | Integrated buffer amplifier and VTT tracking logic support JEDEC-compliant memory termination without external op-amps. |
Applications
| FPGA Core Power Supply | DDR Memory Termination |
|---|---|
|
Use Scenario: Powering Xilinx Kintex or Microsemi RTG4 FPGA core rails requiring tight regulation and radiation tolerance in LEO satellite payloads. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.0V/1.2V core voltage with monotonic start-up and ±1% reference accuracy under 100krad(Si) TID exposure. Use Value: Eliminates need for external radiation-hardened discrete regulators and reduces BOM count by integrating 10-phase capability in single CQFP package. |
Use Scenario: Generating VTT termination voltage for DDR3 SODIMM modules in radiation-hardened avionics computers. IC Role / Device Role / Timing Role: Dual-function regulator providing VDDQ (2.5V) and VTT (1.25V) simultaneously using internal buffer amplifier and VREF tracking. Use Value: Achieves JEDEC-compliant VTT = VDDQ/2 tracking accuracy within ±15mV without external resistive dividers or op-amps. |
| Rad-Hard Distributed Power System | Space-Qualified CPU I/O Supply |
|
Use Scenario: Point-of-load conversion in compact spacecraft power distribution units where size, weight, and reliability are critical. IC Role / Device Role / Timing Role: High-efficiency (95% peak) buck converter operating from 12V intermediate bus to generate 3.3V I/O rails with diode emulation for variable load profiles. Use Value: Reduces thermal footprint via θJC = 0.7°C/W heatsink interface and eliminates external MOSFET drivers, gate resistors, and bootstrap networks. |
Use Scenario: Supplying 1.8V I/O voltage to rad-hard ARM-based processors (e.g., GR740) in onboard data handling units. IC Role / Device Role / Timing Role: Radiation-tolerant synchronous buck regulator with 300kHz/500kHz frequency selection to avoid sensitive telemetry bands while maintaining fast transient response. Use Value: Enables compliance with ESA ECSS-E-ST-20-07C EMC requirements through synchronized switching and low-noise linear regulator bias supplies (AVDD/DVDD/VREFA). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar radiation-hardened buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL70003SEH | Legacy version with 6A max output current at TJ ≤+125°C and looser load regulation (>0.5% typical). | Lacks DDR buffer amplifier and VTT tracking; not qualified for DDR4 VREF generation. | Select ISL70003SEH only if legacy qualification reuse is required and 9A output or DDR4 support is unnecessary. |
| ISL75051ASEH | Single-phase 5A rad-hard buck with identical pinout but no multi-phase LXx outputs or SEL1/SEL2 phase control logic. | Cannot scale beyond 5A; lacks IMON monitoring, diode emulation, and DDR-specific BUFOUT functionality. | Choose ISL75051ASEH for simpler, lower-current point-of-load designs where phase shedding and VTT tracking are not needed. |
Compared with ISL70003SEH and ISL75051ASEH, the ISL70003ASEHX/SAMPLE uniquely combines 9A multi-phase capability, integrated DDR buffer, radiation-hardened IMON sensing, and monotonic pre-biased start-up-making it the only solution qualified for next-generation rad-hard FPGA and DDR4 memory subsystems.
Availability
ISL70003ASEHX/SAMPLE is available at Aetrix Electronics and suitable for FPGA core power, DDR memory termination, and rad-hard distributed power systems requiring stable component supply across extended temperature and radiation environments.
Supply support for ISL70003ASEHX/SAMPLE 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 ISL70003ASEHX/SAMPLE belongs to Renesas' Space & Harsh Environment Power Management product line, engineered specifically for high-reliability DC-DC conversion in satellites, launch vehicles, and nuclear instrumentation where TID, SEE, and extreme temperature resilience are mandatory.
FAQ
What is the maximum output current rating of the ISL70003ASEHX/SAMPLE at +125°C junction temperature?
The ISL70003ASEHX/SAMPLE delivers 9A continuous output current when junction temperature remains at or below +125°C. This rating assumes proper thermal management using the exposed heatsink (HS pin) and adherence to recommended PCB layout guidelines for PGNDx and LXx routing. At +150°C junction, the rated output current derates to 6A per the datasheet's Recommended Operating Conditions table.
How does the ISL70003ASEHX/SAMPLE support DDR memory termination voltage generation?
The ISL70003ASEHX/SAMPLE supports DDR termination via its integrated buffer amplifier (BUFOUT, BUFIN+, BUFIN−). When configured per Figure 6 of the datasheet, it generates precise VREF = VDDQ/2 for DDR4 VTT rails. The buffer provides 3A sinking capability and maintains tracking accuracy within ±15mV, eliminating external op-amps and reducing component count in memory power solutions.
Can the ISL70003ASEHX/SAMPLE operate with a 3.0V input supply?
Yes, the ISL70003ASEHX/SAMPLE operates across a full 3.0V to 13.2V input range. At 3.0V input, it maintains 30–60mA operating supply current (depending on FSEL setting) and supports minimum output voltages down to 0.6V. However, output voltage must remain below ~90% of VIN - so at 3.0V input, maximum regulated output is approximately 2.7V.
What radiation hardness specifications are verified for the ISL70003ASEHX/SAMPLE?
The ISL70003ASEHX/SAMPLE is electrically screened to DLA SMD 5962-14203, wafer-level acceptance tested to 50krad(Si) LDR, and TID RHA qualified to 100krad(Si) HDR. SEE characterization includes DSEE LETTH of 86.4MeV·cm²/mg and SEFI LETTH of 60MeV·cm²/mg, with output voltage deviation limited to <±3% ΔVOUT at worst-case LET conditions.
How is phase shedding controlled on the ISL70003ASEHX/SAMPLE?
Phase shedding is controlled via two logic-level inputs: SEL1 (Pin 29) and SEL2 (Pin 30). These form a 2-bit code that sets the number of active power blocks (1–10 phases), allowing dynamic adjustment of output current capability and efficiency based on real-time load demand. Both pins accept 0V/5V logic levels referenced to VREFD.
ISL70003ASEHX/SAMPLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- Die
- 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:
- Die
ISL70003ASEHX/SAMPLE FAQ
1.How can I place an order for ISL70003ASEHX/SAMPLE through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL70003ASEHX/SAMPLE 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 ISL70003ASEHX/SAMPLE reliable?
The price and inventory of ISL70003ASEHX/SAMPLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL70003ASEHX/SAMPLE is usually 5 days.
3.What payment methods are accepted for ISL70003ASEHX/SAMPLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL70003ASEHX/SAMPLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL70003ASEHX/SAMPLE?
ISL70003ASEHX/SAMPLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL70003ASEHX/SAMPLE 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 ISL70003ASEHX/SAMPLE?
For technical support, including ISL70003ASEHX/SAMPLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL70003ASEHX/SAMPLE requirements.
6.How does Aetrix verify that ISL70003ASEHX/SAMPLE is sourced from the original manufacturer or authorized distributors?
All ISL70003ASEHX/SAMPLE 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 ISL70003ASEHX/SAMPLE meets industry standards.
7.What is the process for return or replacement of ISL70003ASEHX/SAMPLE?
All ISL70003ASEHX/SAMPLE units undergo pre-shipment inspection (PSI). If there is an issue with ISL70003ASEHX/SAMPLE, 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 ISL70003ASEHX/SAMPLE part is unused and in its original packaging.
Return procedure for ISL70003ASEHX/SAMPLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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