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Renesas ISL8502AIRZ-T
- Part No.:
- ISL8502AIRZ-T
- Manufacturer:
- Renesas
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL8502AIRZ-T.pdf
- Description:
- IC REG BUCK ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,460
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Product details
Overview
ISL8502AIRZ-T from Renesas (formerly Intersil) is a 2A synchronous buck regulator IC with integrated high-side and low-side 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 supports 500kHz–1.2MHz switching frequency - enabling compact, high-efficiency power delivery for GPU memory rails and ASIC core supplies.
For engineers reviewing the ISL8502AIRZ-T datasheet, ISL8502AIRZ-T pinout, ISL8502AIRZ-T application, or ISL8502AIRZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and protection behavior, and real-world multi-channel synchronization capability - all grounded in the FN7940 Rev 0.00 datasheet and Renesas official specifications.
Technical Context
The ISL8502AIRZ-T implements voltage-mode PWM control with input voltage feed-forward for constant modulator gain and fast transient response. Its internal oscillator allows programmable switching frequency (500kHz–1.2MHz) via external resistor on FS pin, and it supports master/slave synchronization across up to six channels to suppress beat frequencies and EMI in multi-rail systems.
It integrates lossless rDS(ON) overcurrent detection on both high-side and low-side MOSFETs, undervoltage monitoring at FB pin (76–84% of 0.6V reference), and thermal shutdown at 150°C with 130°C hysteresis. The bi-directional EN pin enables fault-driven system-level disable coordination in daisy-chained configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - sufficient for GPU I/O, DSP cores, and mid-power FPGA banks without external MOSFETs. |
| Input Voltage Range | 5.5V to 14V - supports 12V intermediate bus and industrial 5V±10% rails with internal LDO biasing. |
| Output Voltage Range | 0.6V to VIN−1.5V - enables sub-1V core supplies with external resistor divider feedback. |
| Regulation Accuracy | ±1% over line, load, and temperature - ensures stable operation for precision analog and digital loads. |
| Switching Frequency | 500kHz to 1.2MHz - balances efficiency vs. size: higher frequency reduces inductor/capacitor footprint. |
| PGOOD Delay | 1ms typical at 500kHz - enables fast system power sequencing while avoiding false asserts during soft-start. |
| Thermal Shutdown | 150°C trip, 130°C recovery - protects against sustained overload or poor PCB thermal design. |
| Package | 24-pin QFN, 4mm × 4mm - exposes thermal pad for direct PCB copper pour attachment to manage 2A dissipation. |
Pinout & Package
ISL8502AIRZ-T is housed in a thermally enhanced 24-lead QFN package (4mm × 4mm, L24.4x4D) with exposed thermal pad. Pin 1 is marked by dot; pins are numbered counter-clockwise. SGND, PGND, VIN, PHASE, and PVCC pins are multiplexed across multiple pads to reduce impedance and improve current handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (1) | Open-drain power-good indicator | Asserts high after 1ms delay when VOUT reaches regulation; sinks fault current during undervoltage or overcurrent events. |
| SGND (2) | Analog ground reference | Return path for error amplifier, COMP, FB, SS, EN - must be isolated from power ground to avoid noise coupling. |
| EN (3) | Bi-directional enable/fault signaling | Pulled low internally for four soft-start periods during fault; supports wired-OR enable bus with diode isolation. |
| SYNCH (4) | Master/slave clock interface | Outputs synchronized clock as master; receives clock as slave; unconnected in stand-alone mode. |
| M/S (5) | Master/slave configuration select | Tied to VCC for master/standalone; pulled to GND via 5kΩ for slave - determines clock source role. |
| FS (6) | Frequency set input | Resistor-to-GND sets fSW: 96kΩ = 500kHz, 40kΩ = 1.2MHz; tied to VCC forces 800kHz fixed frequency. |
| COMP (7) | Error amplifier compensation node | Connects AC network (RC/Zobel) between COMP and FB to stabilize voltage loop with selected output capacitor ESR. |
| FB (8) | Feedback input | Senses scaled output voltage; referenced to 0.6V internal bandgap; monitored for undervoltage (≤0.48V). |
| SS (9) | Soft-start timing node | 30µA internal current charges external capacitor; sets ramp time: tSS = 50 × CSS (µF) seconds. |
| PGND (10–13) | Power ground return | Four dedicated pins minimize ground bounce during 2A switching transitions; must connect directly to thermal pad. |
| PHASE (14–17) | Switch node connection | Four parallel pins reduce trace inductance to inductor; carries full switching current (VIN to GND) at high dv/dt. |
| VIN (18–21) | Main input supply | Four pins accept 5.5–14V input; also powers internal 5V LDO (PVCC); requires local 10µF ceramic decoupling. |
| BOOT (22) | High-side gate driver bootstrap | Internal boot diode charges external 0.1µF capacitor; enables N-MOS high-side drive without external charge pump. |
| PVCC (23) | Internal LDO output | 5V ±5% regulated output (max 50mA); powers gate drivers and logic; requires ≥4.7µF ceramic decoupling. |
| VCC (24) | Bias supply input | Tied to PVCC via RC filter (10Ω + 0.1µF); filters noise from gate drive return currents before entering control circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | Reduces BOM count and PCB area: eliminates 4 external FETs, drivers, and associated gate resistors. |
| Lossless rDS(ON) OCP | Detects overcurrent without sense resistors - preserves efficiency and avoids power loss in current sensing path. |
| Adjustable soft-start | Programmable ramp time via SS capacitor prevents inrush current into large output capacitors (>100µF). |
| Start-up with pre-biased output | Allows safe turn-on when output already holds voltage (e.g., hot-swap or rail-sharing systems), preventing reverse current. |
| Multi-channel synchronization | Enables up to six ISL8502A channels to share one clock - eliminates beat frequencies and simplifies EMI filtering. |
| Bi-directional EN pin | Supports coordinated fault propagation: any device can pull shared EN bus low to disable others in cascaded systems. |
Applications
| Graphics Card GPU Core Supply | ASIC I/O Voltage Rail |
|---|---|
|
Use Scenario: Powering GPU core logic operating at 0.85V/1.8A with tight transient response requirements. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated core voltage; handles 2A load steps with <5% output deviation. Use Value: Integrated MOSFETs and 1.2MHz switching enable <30mm² solution size; ±1% regulation maintains GPU stability under DVFS. |
Use Scenario: Generating 1.2V/1.5A I/O supply for high-speed SerDes interfaces on an ASIC. IC Role / Device Role / Timing Role: Stand-alone buck converter with PGOOD sequencing to enable downstream logic only after stable 1.2V is established. Use Value: 1ms PGOOD delay aligns with FPGA configuration timing; 500kHz operation optimizes efficiency at light loads. |
| Embedded Processor DDR Memory | DSP Signal Processing Module |
|
Use Scenario: Providing 1.35V/2A VDDQ supply to DDR3L memory subsystem in industrial controller. IC Role / Device Role / Timing Role: Synchronous buck regulator with start-up into pre-biased output - avoids reverse current when memory retains charge. Use Value: Undervoltage lockout at 76% of 0.6V reference (0.456V FB) ensures memory reset if VDDQ drops below 1.29V. |
Use Scenario: Delivering 3.3V/1.2A analog and digital supply to TI C6000-series DSP with low-noise requirements. IC Role / Device Role / Timing Role: Master channel in dual-regulator setup - synchronizes second ISL8502A generating 1.2V core rail. Use Value: SYNCH pin coordination eliminates 100kHz–2MHz beat tones between rails, reducing conducted EMI in sensitive signal paths. |
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, 4.5–28V input, fixed 500kHz fSW, no master/slave sync, smaller 3mm×3mm QFN | Lacks multi-channel synchronization and bi-directional EN; better suited for single-rail, cost-sensitive designs | Choose MP2315DJ-LF-Z when board space is critical and multi-rail coordination is unnecessary. |
| TPS54202DRCT | 2A, 4.5–28V input, adjustable fSW (200kHz–1.7MHz), integrated soft-start, no lossless OCP | Uses external current-sense resistor; lacks PGOOD delay spec and thermal hysteresis detail in datasheet | Choose TPS54202DRCT when wider input range and higher max fSW are required, accepting added component count. |
Compared with MP2315DJ-LF-Z and TPS54202DRCT, the ISL8502AIRZ-T uniquely combines lossless overcurrent protection, precise 1ms PGOOD timing, and hardware-based master/slave synchronization - making it optimal for tightly coordinated multi-rail systems where EMI and sequencing reliability are critical.
Availability
ISL8502AIRZ-T is available at Aetrix Electronics and suitable for graphics card GPU supplies, ASIC I/O rails, and embedded processor DDR memory applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial temperature support (–40°C to +85°C).
Supply support for ISL8502AIRZ-T 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 acquired Intersil in 2017 and maintains full technical and manufacturing continuity for the ISL8502A family. Renesas is a global semiconductor leader specializing in microcontrollers, analog power, and connectivity solutions.
The ISL8502A product line was engineered for high-density point-of-load regulation in computing and communications infrastructure, emphasizing integration, thermal robustness, and multi-rail coordination - directly addressing challenges in GPU, FPGA, and ASIC power delivery.
FAQ
What is the maximum input voltage rating for the ISL8502AIRZ-T?
The absolute maximum input voltage (VIN) for the ISL8502AIRZ-T is +16.5V, but the recommended operating range is 5.5V to 14V per the FN7940 datasheet. Exceeding 14V risks violating the upper MOSFET's 15.5V voltage stress limit across drain-source terminals, especially during transients. For reliable long-term operation, keep VIN ≤14V with adequate margin for ringing.
Does the ISL8502AIRZ-T support output voltages below 0.6V?
No, the ISL8502AIRZ-T does not support output voltages below its internal 0.6V reference voltage. The FB pin is referenced to this fixed bandgap, and the minimum programmable output is 0.6V (achieved by omitting the top feedback resistor). Attempting lower outputs violates the error amplifier's common-mode input range and disables regulation.
How does the bi-directional EN pin function during fault conditions in the ISL8502AIRZ-T?
During overcurrent or undervoltage faults, the ISL8502AIRZ-T actively pulls the EN pin low for four consecutive soft-start periods (e.g., ~4 × tSS). This enables system-level fault propagation: if multiple ISL8502AIRZ-T devices share an EN bus via diode-OR, one device's fault can disable others. The pin returns high only after fault clearance and successful restart.
Can the ISL8502AIRZ-T operate with a 5V input supply?
Yes, the ISL8502AIRZ-T supports 4.5V to 5.5V input operation, but requires VIN to be connected directly to VCC (bypassing the internal LDO). In this mode, the 5V rail powers all internal circuitry. The datasheet confirms stable regulation down to 4.5V input when configured per Figure 2, with appropriate output capacitor selection for transient response.
What thermal management is required for the ISL8502AIRZ-T at full 2A load?
At 2A continuous load and 12V input, the ISL8502AIRZ-T dissipates ~0.8W (based on typical 88% efficiency). Its QFN package has θJA = 38°C/W; thus, with 25°C ambient, junction temperature rises ~30°C - well below the 150°C shutdown threshold. A 200mm² 2-oz copper thermal pad under the exposed die pad is strongly recommended to maintain <100°C junction under worst-case conditions.
ISL8502AIRZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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-T FAQ
1.How can I place an order for ISL8502AIRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8502AIRZ-T 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-T reliable?
The price and inventory of ISL8502AIRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8502AIRZ-T is usually 5 days.
3.What payment methods are accepted for ISL8502AIRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8502AIRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8502AIRZ-T?
ISL8502AIRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8502AIRZ-T 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-T?
For technical support, including ISL8502AIRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8502AIRZ-T requirements.
6.How does Aetrix verify that ISL8502AIRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8502AIRZ-T 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-T meets industry standards.
7.What is the process for return or replacement of ISL8502AIRZ-T?
All ISL8502AIRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8502AIRZ-T, 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-T part is unused and in its original packaging.
Return procedure for ISL8502AIRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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