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Renesas ISL8502IRZ-T
- Part No.:
- ISL8502IRZ-T
- Manufacturer:
- Renesas
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL8502IRZ-T.pdf
- Description:
- IC REG BUCK ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,221
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Product details
Overview
ISL8502IRZ-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 applications. It operates from 5.5V to 14V input, delivers adjustable output down to 0.6V with ±1% regulation accuracy, and supports switching frequencies from 500kHz to 1.2MHz - enabling compact filter design for GPU, ASIC, and embedded processor power rails.
For engineers reviewing the ISL8502IRZ-T datasheet, ISL8502IRZ-T pinout, ISL8502IRZ-T application, or ISL8502IRZ-T equivalent, this device offers verified voltage-mode control, lossless rDS(ON) overcurrent protection, bi-directional enable with fault pull-down, power-good indication, and master/slave synchronization for multi-rail systems - all in a thermally enhanced 24-lead 4mm × 4mm QFN package.
Technical Context
The ISL8502IRZ-T implements a single-loop voltage-mode PWM controller driving two internal N-channel MOSFETs in a synchronous buck topology, with input voltage feed-forward to maintain constant modulator gain across input variations. Its adaptive shoot-through protection prevents simultaneous conduction, and the integrated series regulator generates a stable 5.0V PVCC rail from VIN for gate drive and bias.
It supports three operational modes: standalone single-channel regulation, master configuration (with SYNCH output and M/S tied to VCC), or slave configuration (M/S grounded, SYNCH input). Up to six slave channels can synchronize to one master, reducing EMI beat frequencies while maintaining independent output voltage programming via FB resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - sufficient for GPU core/memory or mid-power FPGA I/O rails without external MOSFETs. |
| Input Voltage Range | 5.5V to 14V - supports standard 12V intermediate bus and industrial 5V–14V inputs; 4.5V–5.5V operation possible when VIN tied to VCC. |
| Output Voltage Range | 0.6V to VIN − losses - enables direct support of sub-1V digital cores (e.g., ARM Cortex-A series) using external resistor divider. |
| Regulation Accuracy | ±1% over line, load, and temperature - ensures stable supply under dynamic load and thermal drift in embedded systems. |
| Switching Frequency | 500kHz to 1.2MHz (programmable via FS pin resistor) - allows optimization between efficiency (lower fSW) and component size (higher fSW). |
| Integrated MOSFETs | rDS(ON) = 180 mΩ (high-side), 90 mΩ (low-side) at VCC = 5V - eliminates external FET layout, reduces BOM count, and improves thermal performance in QFN package. |
| Protection Features | Lossless rDS(ON) overcurrent detection, undervoltage lockout (76–84% VREF), thermal shutdown (150°C), and hiccup-mode fault recovery - enables robust operation in unattended systems. |
Pinout & Package
ISL8502IRZ-T is housed in a RoHS-compliant, thermally enhanced 24-lead QFN package (4mm × 4mm, 0.5mm pitch) with an exposed metal pad for PCB-level heat dissipation (θJA = 39°C/W, θJC = 2.5°C/W). The package supports reflow per IPC/JEDEC J-STD-020 Pb-free profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (1) | Open-drain power-good indicator | Pulls low on undervoltage, overcurrent, or thermal fault; includes 250ms startup delay at 500kHz - enables system sequencing and fault logging. |
| SGND (2) | Analog ground reference | Return path for error amplifier, COMP, FB, and control circuitry - must be separated from PGND to avoid noise coupling into feedback loop. |
| EN (3) | Bi-directional enable/fault signaling | Rising threshold = 2.7V; pulls low internally for 4 soft-start periods during fault - supports shared enable bus with diode-or isolation in multi-rail designs. |
| SYNCH (4) | Master clock output / slave clock input | Outputs synchronized oscillator signal in master mode; disables slave if no clock detected - eliminates beat frequencies in multi-channel systems. |
| M/S (5) | Master/slave configuration select | Tied to VCC for master/standalone; pulled to GND via 5kΩ for slave - defines hierarchical timing control without external logic. |
| FS (6) | Frequency set input | Resistor-to-GND sets fSW: 96kΩ → 500kHz, 40kΩ → 1.2MHz; tied to VCC → 800kHz - enables precise EMI management and efficiency tuning. |
| COMP (7) | Error amplifier compensation node | Connects RC network between COMP and FB to stabilize voltage loop - critical for transient response and phase margin in 2A buck designs. |
| FB (8) | Feedback input | Monitors scaled output voltage against 0.6V internal reference; also triggers undervoltage shutdown if <76% VREF - enables precision output setting and fault detection. |
| SS (9) | Soft-start timing node | 30µA current source charges external capacitor (tSS ≈ 50 × CSS) - controls ramp rate to prevent inrush current and overshoot during startup. |
| PGND (10–13) | Power ground return | Low-impedance return for high-current PHASE switching path - must be connected directly to exposed pad and kept separate from SGND. |
| PHASE (14–17) | Switch node connection | Connects to inductor and internal MOSFET sources/drains - carries high di/dt; requires short, wide traces and tight layout to minimize EMI and ringing. |
| VIN (18–21) | Main input supply | Accepts 5.5–14V input; powers internal linear regulator (PVCC) and high-side driver - multiple pins reduce IR drop and improve thermal distribution. |
| BOOT (22) | High-side gate driver bootstrap | Internal boot diode + external capacitor generates >VIN gate drive for upper N-MOSFET - eliminates need for external charge pump. |
| PVCC (23) | Internal LDO output | 5.0V ±0.5V regulated output (50mA max); powers gate drivers and analog circuits - requires ≥4.7µF ceramic decoupling close to pin. |
| VCC (24) | Bias supply input | Tied to PVCC via RC filter (10Ω + 0.1µF); filters noise from gate drive return path - essential for stable oscillator and error amplifier operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | Eliminates 4 external FETs and associated gate drivers, reducing solution footprint by >40% vs discrete buck controllers. |
| Adjustable soft-start | Programmable startup time via SS capacitor - prevents input voltage sag and output overshoot during power-up sequences. |
| Start-up with pre-biased output | Enables safe turn-on when output capacitor is already charged - critical for hot-swap and multi-rail sequencing applications. |
| Master/slave synchronization | Supports up to 6 synchronized channels from one master - reduces conducted EMI peaks and simplifies filtering in multi-rail boards. |
| Lossless overcurrent protection | Uses internal rDS(ON) sensing instead of sense resistors - preserves efficiency and avoids additional power loss and board area. |
| Power-good with hysteresis | 111% rising / 90% falling VREF thresholds - prevents chatter during marginal output conditions and enables reliable system reset assertion. |
Applications
| Graphics Card GPU Core Supply | ASIC I/O Power Rail |
|---|---|
|
Use Scenario: Delivering tightly regulated 0.85V/2A to GPU core under rapid load transients during gaming or compute workloads. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with voltage-mode control and fast transient response. Use Value: ±1% regulation accuracy and 500kHz–1.2MHz programmability ensure stable core voltage across frequency scaling, minimizing timing violations. |
Use Scenario: Providing 1.8V/2A to ASIC I/O banks requiring clean, low-noise supply with sequencing compatibility. IC Role / Device Role / Timing Role: Standalone DC/DC converter with PGOOD and EN for controlled power-up/down coordination. Use Value: Integrated MOSFETs and soft-start prevent inrush current, while PGOOD enables FPGA configuration lock until rail is valid. |
| Embedded Processor SoC Core | DSP Memory Interface Supply |
|
Use Scenario: Generating 0.95V/2A for ARM-based SoC cores in industrial gateways with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Thermally robust buck regulator with integrated thermal shutdown (150°C trip) and recovery (130°C). Use Value: Exposed-pad QFN package and low rDS(ON) MOSFETs sustain full 2A load without derating in sealed enclosures. |
Use Scenario: Powering DDR3/DDR4 memory termination and interface circuits requiring low-ripple, fast-response 1.2V/2A supply. IC Role / Device Role / Timing Role: Synchronized slave channel in multi-rail system sharing master clock to suppress beat frequencies. Use Value: Master/slave sync eliminates 10–100kHz inter-rail interference that could corrupt high-speed memory data eye diagrams. |
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, 4.5–36V input, fixed 500kHz fSW, no master/slave sync, smaller 8-pin SOIC-EP package | Lacks SYNCH/M/S pins and multi-channel coordination - suitable only for single-rail, wide-input industrial apps | Select when input exceeds 14V or board space is extremely constrained; not suitable for synchronized multi-rail systems. |
| TPS54202DRCT | 2A, 4.5–17V input, 500kHz–1.7MHz adjustable fSW, integrated MOSFETs, but no bi-directional EN or PGOOD hysteresis | No built-in hiccup-mode recovery or EN fault pull-down - requires external circuitry for robust fault handling | Choose when higher input voltage range is needed and fault signaling can be implemented externally; less autonomous than ISL8502IRZ-T. |
Compared with MP2315DJ-LF-Z and TPS54202DRCT, the ISL8502IRZ-T uniquely combines master/slave synchronization, bi-directional EN with automatic fault pull-down, and lossless rDS(ON) overcurrent protection - making it optimal for compact, multi-rail embedded systems requiring autonomous fault management and EMI control.
Availability
ISL8502IRZ-T is available at Aetrix Electronics and suitable for graphics card GPU supplies, ASIC I/O power rails, and embedded processor SoC core applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8502IRZ-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 Corporation (acquired Intersil in 2017) is a global semiconductor leader specializing in microcontrollers, analog power management, and timing solutions for automotive, industrial, and computing markets.
The ISL8502IRZ-T belongs to Renesas' legacy Intersil power management portfolio, engineered specifically for high-density, multi-rail point-of-load regulation in graphics, communications, and embedded processing systems where thermal performance and EMI control are critical.
FAQ
What is the maximum input voltage rating for the ISL8502IRZ-T?
The absolute maximum input voltage (VIN) for the ISL8502IRZ-T is +16.5V, but the recommended operating range is 5.5V to 14V. Operation above 14V is permissible only if voltage stress across the internal MOSFETs remains below 15.5V under all conditions, including transients. For reliable long-term use, staying within the 5.5V–14V range is advised. The ISL8502IRZ-T datasheet specifies this limit in Absolute Maximum Ratings on page 5.
Does the ISL8502IRZ-T support output voltages below 1V?
Yes, the ISL8502IRZ-T supports output voltages down to 0.6V, set by an external resistor divider on the FB pin referencing its internal 0.6V precision bandgap. This enables direct regulation of modern low-voltage digital cores such as ARM Cortex-A series or FPGA fabric rails. The ±1% regulation tolerance holds across temperature and load, ensuring stability even at sub-1V levels. Confirmed in Electrical Specifications (page 6) and Typical Performance Curves (pages 7–8).
How does the ISL8502IRZ-T handle overcurrent faults?
The ISL8502IRZ-T uses lossless rDS(ON) sensing on both internal MOSFETs to detect overcurrent. Upon detection, it disables the high-side FET immediately and initiates hiccup-mode recovery after eight consecutive faults - pulling the EN pin low for four soft-start periods before retrying. This autonomous behavior prevents thermal runaway without external circuitry. Details are in Fault Protection (pages 13–14) and Electrical Specifications (page 6, IPOC_peak).
Can the ISL8502IRZ-T be used without external compensation components?
No, the ISL8502IRZ-T requires external compensation components connected between COMP and FB pins to stabilize the voltage-mode control loop. A typical network includes a series RC or R-C-RC configuration selected based on output capacitance and ESR. Omitting compensation risks oscillation or poor transient response. Application Guidelines (pages 14–15) provide design equations and layout recommendations for proper loop stability.
Is the ISL8502IRZ-T pin-compatible with other members of the ISL85xx family?
No, the ISL8502IRZ-T is not pin-compatible with other ISL85xx devices such as ISL8500 or ISL8503. Its 24-pin QFN layout, PHASE pin count (4 pins), and dedicated M/S, SYNCH, and PGOOD functions are unique to the ISL8502. Substituting requires PCB redesign. Pinout validation is confirmed in the Top View diagram (page 1) and Functional Pin Descriptions (pages 12–13) of the ISL8502 datasheet FN6389 Rev 2.00.
ISL8502IRZ-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)
ISL8502IRZ-T FAQ
1.How can I place an order for ISL8502IRZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8502IRZ-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 ISL8502IRZ-T reliable?
The price and inventory of ISL8502IRZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8502IRZ-T is usually 5 days.
3.What payment methods are accepted for ISL8502IRZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8502IRZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8502IRZ-T?
ISL8502IRZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8502IRZ-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 ISL8502IRZ-T?
For technical support, including ISL8502IRZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8502IRZ-T requirements.
6.How does Aetrix verify that ISL8502IRZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8502IRZ-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 ISL8502IRZ-T meets industry standards.
7.What is the process for return or replacement of ISL8502IRZ-T?
All ISL8502IRZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8502IRZ-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 ISL8502IRZ-T part is unused and in its original packaging.
Return procedure for ISL8502IRZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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