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Renesas ISL8502AIRZ
- Part No.:
- ISL8502AIRZ
- Manufacturer:
- Renesas
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL8502AIRZ.pdf
- Description:
- IC REG BUCK ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
ISL8502AIRZ from Renesas (formerly Intersil) is a 2A synchronous buck regulator with integrated N-channel MOSFETs, designed for point-of-load DC/DC conversion in space-constrained systems. It operates from 5.5V to 14V input, delivers adjustable output down to 0.6V with ±1% regulation accuracy, and features voltage-mode PWM control with 500kHz–1.2MHz programmable switching frequency - used in GPU power supplies, ASIC rails, and embedded processor I/O domains.
For engineers reviewing the ISL8502AIRZ datasheet, ISL8502AIRZ pinout, ISL8502AIRZ application, or ISL8502AIRZ equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and protection behavior, and real-world multi-channel synchronization capability - all specific to the ISL8502AIRZ 24-lead 4×4 QFN package.
Technical Context
The ISL8502AIRZ implements a single-loop voltage-mode PWM controller with input voltage feed-forward to maintain constant modulator gain across input variations. Its internal architecture integrates dual N-channel MOSFETs (180mΩ high-side, 90mΩ low-side), adaptive shoot-through protection, and a dedicated series regulator generating 4.5–5.5V PVCC bias from VIN.
It supports both stand-alone operation and master/slave multi-rail synchronization via the bi-directional SYNCH pin, enabling up to six synchronized channels with minimized EMI beat frequencies. Fault handling includes lossless rDS(ON)-based overcurrent detection, undervoltage monitoring at FB (76–84% of VREF), and thermal shutdown at 150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - sufficient for GPU memory rails and mid-power ASIC cores without external MOSFETs. |
| Input Voltage Range | 5.5V to 14V - supports 12V intermediate bus and industrial 5V±10% inputs when VIN tied to VCC. |
| Output Voltage Range | 0.6V to VIN−1.5V - enables core voltage scaling for modern processors and FPGAs. |
| Regulation Accuracy | ±1% over line, load, and temperature - ensures stable logic-level compliance under dynamic load transients. |
| Switching Frequency | 500kHz to 1.2MHz (programmable via RT resistor) - balances efficiency vs. size: higher fSW allows smaller inductors/capacitors. |
| PGOOD Delay | 1ms typical at 500kHz - fast power-good assertion enables tight sequencing in multi-rail systems. |
| Thermal Shutdown | 150°C trip, 130°C recovery - protects against sustained overload or poor PCB thermal design. |
Pinout & Package
ISL8502AIRZ is housed in a thermally enhanced 24-lead 4mm × 4mm QFN package (PKG DWG L24.4x4D) with exposed thermal pad. Pin functions are validated per FN7940 Rev 0.00 datasheet, Page 13.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (1) | Open-drain fault indicator | Pulls low on undervoltage, overcurrent, or thermal fault; 1ms delay at 500kHz ensures clean system sequencing. |
| EN (3) | Bi-directional enable/fault signaling | Enables regulator when >2.7V; pulls low internally for four soft-start periods during fault - enables shared enable bus with fault propagation. |
| SYNCH (4) | Master/slave clock interface | Outputs clock as master; receives clock as slave - synchronizes up to six ISL8502AIRZ channels to suppress EMI beat frequencies. |
| M/S (5) | Mode selection | Tied to VCC for master/standalone; pulled to GND via 5kΩ for slave - configures IC role without external logic. |
| FS (6) | Frequency set input | Accepts RT resistor to GND (40kΩ–96kΩ) to program 500kHz–1.2MHz; tied to VCC for fixed 800kHz. |
| FB (8) | Voltage feedback input | Monitors output via resistor divider; triggers undervoltage shutdown if <76% of 0.6V reference. |
| SS (9) | Soft-start timing node | 30µA internal current charges external capacitor - controls ramp rate to prevent inrush current and overshoot. |
| PHASE (14–17) | Switch node connection | Four parallel pins reduce parasitic inductance at high di/dt switching node - critical for EMI and efficiency. |
| VIN (18–21) | Main power input | Four parallel pins distribute high-current input path - minimizes IR drop and improves thermal performance. |
| BOOT (22) | High-side gate driver supply | Internal bootstrap diode enables self-biased high-side drive - eliminates external diode and reduces BOM count. |
| PVCC (23) | Internal LDO output | Supplies 4.5–5.5V bias to control circuitry; requires ≥4.7µF decoupling for stability under transient loads. |
| VCC (24) | Bias supply input | Tied to PVCC via RC filter (10Ω + 0.1µF) - filters noise from gate drive return currents to preserve error amplifier accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | Eliminates external high-side/low-side FETs and drivers - reduces solution footprint by >40% vs discrete buck controllers. |
| Lossless rDS(ON) overcurrent protection | Detects overcurrent using MOSFET on-resistance - avoids sense resistor losses and maintains >92% peak efficiency at 2A. |
| Start-up with pre-biased output | Allows safe power-up into existing output voltage - prevents reverse current flow in hot-swap or multi-source systems. |
| Adjustable soft-start | External capacitor sets ramp time - prevents output overshoot and inrush stress on downstream capacitors and loads. |
| Master/slave synchronization | Single SYNCH net coordinates up to six ISL8502AIRZ regulators - removes beat frequencies and simplifies EMI filtering. |
Applications
| Graphics Card GPU Core Supply | ASIC I/O Voltage Rail |
|---|---|
|
Use Scenario: Powers GPU core logic requiring tightly regulated 0.85V–1.2V at up to 2A with fast transient response. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering core voltage with ±1% accuracy and 1ms PGOOD assertion. Use Value: Integrated MOSFETs and 500kHz–1.2MHz frequency tuning enable compact layout adjacent to GPU die - reducing trace inductance and improving load-step response. |
Use Scenario: Supplies configurable I/O banks on high-speed ASICs where voltage must scale between 1.2V and 1.8V. IC Role / Device Role / Timing Role: Adjustable-output buck converter with FB-based feedback and soft-start for glitch-free I/O domain power-up. Use Value: 0.6V reference and ±1% regulation ensure signal integrity across process/voltage/temperature corners - meeting JEDEC I/O spec margins. |
| Embedded Processor Memory Interface | Industrial FPGA Configuration Rail |
|
Use Scenario: Delivers 1.35V DDR3/LPDDR4 memory termination and interface voltage in fanless edge devices. IC Role / Device Role / Timing Role: Stand-alone buck regulator with thermal shutdown and undervoltage lockout for unattended operation. Use Value: 150°C thermal shutdown and hiccup-mode fault recovery prevent latch-up during extended ambient temperature excursions (>85°C). |
Use Scenario: Powers FPGA configuration and auxiliary logic in programmable logic controllers with strict sequencing requirements. IC Role / Device Role / Timing Role: Synchronized slave channel in multi-rail system - aligned to master clock for deterministic power-up timing. Use Value: SYNCH-driven synchronization eliminates inter-rail beat frequencies - simplifying EMC compliance testing for industrial Class A emissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 2A, 4.5–24V input, fixed 500kHz, no M/S or SYNCH sync capability, smaller 8-pin SOIC package. | Lacks multi-channel synchronization and master/slave mode - suitable only for single-rail, cost-sensitive designs. | Select when board space is constrained and multi-rail coordination is unnecessary; verify thermal derating above 1A at 12VIN. |
| TPS54202DRCT | 2A, 4.5–28V input, 200kHz–1.7MHz adjustable frequency, integrated compensation, no integrated low-side MOSFET (external diode required). | Requires external Schottky diode for synchronous rectification - increases BOM count and reduces efficiency at light loads. | Choose when wider input range or higher fSW flexibility is needed; confirm layout accommodates external diode and compensation network. |
Compared with MP2315DJ-LF-Z and TPS54202DRCT, the ISL8502AIRZ uniquely combines integrated dual MOSFETs, master/slave synchronization, and lossless overcurrent protection - making it optimal for compact, multi-rail, thermally demanding embedded power systems where reliability and EMI control are critical.
Availability
ISL8502AIRZ is available at Aetrix Electronics and suitable for graphics card GPU supplies, ASIC I/O rails, and embedded processor memory interfaces requiring stable component supply across industrial temperature ranges (-40°C to +85°C).
Supply support for ISL8502AIRZ 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 Corporation acquired Intersil in 2017 and maintains full technical and manufacturing continuity for the ISL8502A family. Renesas is a global semiconductor leader focused on microcontrollers, analog, and power management solutions.
The ISL8502A product line was engineered specifically for high-density, multi-rail point-of-load regulation in graphics, computing, and industrial embedded systems - emphasizing integration, thermal robustness, and EMI-aware synchronization.
FAQ
What is the maximum input voltage rating for the ISL8502AIRZ?
The absolute maximum VIN is +16.5V, but the recommended operating range is 5.5V to 14V. Exceeding 14V risks violating the upper MOSFET's 15.5V voltage stress limit under transient conditions. The ISL8502AIRZ datasheet explicitly states that 14V is the practical upper limit for reliable long-term operation with margin.
Does the ISL8502AIRZ require an external bootstrap diode?
No - the ISL8502AIRZ integrates a bootstrap diode internally. The BOOT pin connects directly to the high-side gate driver and uses the internal diode to charge the bootstrap capacitor during low-side conduction. This eliminates the need for an external diode and reduces component count and layout complexity.
Can the ISL8502AIRZ operate with a 5V input supply?
Yes, the ISL8502AIRZ supports 4.5V to 5.5V input when VIN is tied directly to VCC. In this configuration, the 5V rail powers both the power train and internal bias circuitry. The datasheet confirms this mode on Page 4 (Figure 2) and specifies 4.5V minimum for VCC operation.
How does the ISL8502AIRZ handle overcurrent faults?
The ISL8502AIRZ uses lossless rDS(ON) sensing on both MOSFETs. Upon detecting eight consecutive overcurrent events, it enters hiccup mode: shuts down, pulls EN low for four soft-start periods (~100ms at typical SS), then attempts restart. This protects the IC and PCB while allowing automatic recovery if the fault clears.
Is the ISL8502AIRZ RoHS compliant and lead-free?
Yes - the ISL8502AIRZ is Pb-free and RoHS compliant per ordering information note 2 in the datasheet. It uses 100% matte tin (e3) termination finish and meets IPC/JEDEC J-STD-020 reflow profiles for lead-free soldering.
ISL8502AIRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.5V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 14V
- Current - Output:
- 2A
- Frequency - Switching:
- 500kHz ~ 1.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
ISL8502AIRZ FAQ
1.How can I place an order for ISL8502AIRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8502AIRZ 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 ISL8502AIRZ reliable?
The price and inventory of ISL8502AIRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8502AIRZ is usually 5 days.
3.What payment methods are accepted for ISL8502AIRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8502AIRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8502AIRZ?
ISL8502AIRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8502AIRZ 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 ISL8502AIRZ?
For technical support, including ISL8502AIRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8502AIRZ requirements.
6.How does Aetrix verify that ISL8502AIRZ is sourced from the original manufacturer or authorized distributors?
All ISL8502AIRZ 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 ISL8502AIRZ meets industry standards.
7.What is the process for return or replacement of ISL8502AIRZ?
All ISL8502AIRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL8502AIRZ, 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 ISL8502AIRZ part is unused and in its original packaging.
Return procedure for ISL8502AIRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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