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Renesas ISL8502IRZ
- Part No.:
- ISL8502IRZ
- Manufacturer:
- Renesas
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL8502IRZ.pdf
- Description:
- IC REG BUCK ADJ 2A 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,011
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Product details
Overview
ISL8502IRZ from Renesas (formerly Intersil) is a 2A synchronous buck regulator with integrated high-side and low-side N-channel MOSFETs, operating from 5.5V to 14V input and delivering adjustable output down to 0.6V with ±1% regulation accuracy. It features voltage-mode PWM control, 500kHz–1.2MHz programmable switching frequency, and supports standalone or master/slave multi-rail synchronization for graphics card GPU/memory supplies and ASIC point-of-load applications.
For engineers reviewing the ISL8502IRZ datasheet, ISL8502IRZ pinout, ISL8502IRZ application, or ISL8502IRZ equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and protection behavior, and real-world design implications for compact DC/DC conversion in space-constrained embedded and computing systems.
Technical Context
The ISL8502IRZ 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 adaptive shoot-through protection, lossless rDS(ON)-based overcurrent sensing on both MOSFETs, and bi-directional EN pin fault signaling.
It supports three operational modes: standalone (M/S tied to PVCC), master (M/S to PVCC, SYNCH output), or slave (M/S to GND, SYNCH input). Up to six slave channels can synchronize to one master, minimizing beat frequencies and EMI in multi-output systems while maintaining independent output voltage programming via FB resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous - supports full load without external current-sense resistors or discrete MOSFET drivers. |
| Input Voltage Range | 5.5V to 14V - accommodates industrial 12V rails and wide-input systems; 4.5V–5.5V operation possible when VIN tied to VCC. |
| Output Voltage Range | 0.6V to VIN−Vdrop - enables core voltage regulation for modern processors and FPGAs using only two external resistors. |
| Regulation Accuracy | ±1% over line/load/temperature - ensures stable power delivery under dynamic conditions without post-regulation trimming. |
| Switching Frequency | 500kHz to 1.2MHz (programmable via FS pin resistor) - balances efficiency vs. size: higher fSW allows smaller inductors/capacitors. |
| Integrated Protection | Lossless high/low-side OCP, undervoltage detection, thermal shutdown (150°C trip, 130°C recovery), and PGOOD with 250ms delay - eliminates need for external monitoring ICs. |
| Package | 24-lead 4mm × 4mm QFN with exposed thermal pad - provides low θJA = 39°C/W for thermally demanding PCB layouts. |
Pinout & Package
ISL8502IRZ is housed in a 24-lead, 4mm × 4mm QFN package (Pb-free, RoHS compliant) with an exposed thermal pad for enhanced heat dissipation. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGOOD (1) | Open-drain power-good indicator | Asserts low if output deviates >±1% or fault occurs; includes fixed 250ms startup delay at 500kHz for reliable sequencing. |
| SGND (2) | Analog ground reference | Return path for error amplifier, COMP, FB, and control circuitry - must be separated from PGND to avoid noise coupling. |
| EN (3) | Bi-directional enable/fault signaling | Enables regulator when >2.7V; pulls low internally during faults for system-level fault propagation and hiccup-mode restart coordination. |
| SYNCH (4) | Master/slave clock interface | Outputs clock as master; receives clock as slave - enables deterministic phase alignment across up to six channels to suppress beat frequencies. |
| M/S (5) | Mode selection | Tied to PVCC for master/standalone; pulled to GND via 5kΩ for slave - configures internal oscillator and SYNCH pin direction. |
| FS (6) | Frequency set input | Resistor-to-GND sets fSW: 96kΩ → 500kHz, 40kΩ → 1.2MHz; tied to PVCC → 800kHz - enables optimization of efficiency vs. component size. |
| COMP (7) | Error amplifier output | Connects to FB via RC network for loop compensation - determines stability margin and transient response speed. |
| FB (8) | Voltage feedback input | Monitors scaled output via resistor divider; also triggers undervoltage shutdown if <80% of 0.6V reference. |
| SS (9) | Soft-start timing node | 30µA internal current source charges external capacitor - sets ramp time to prevent inrush current and overshoot during startup. |
| PGND (10–13) | Power ground return | Low-impedance path for high di/dt currents from PHASE pins - must connect directly to thermal pad and bulk input capacitor. |
| PHASE (14–17) | Switch node connection | Four paralleled pins reduce trace inductance and conduction losses - connects directly to inductor and high-frequency output capacitor. |
| VIN (18–21) | Main input supply | Four paralleled pins accept 5.5–14V input and feed internal series regulator - improves current sharing and reduces IR drop. |
| BOOT (22) | High-side gate driver bootstrap | Internal boot diode charges external capacitor - enables efficient N-MOSFET high-side drive without external charge pump. |
| PVCC (23) | Internal LDO output | 5.0V ±0.5V regulated output (50mA max) - powers gate drivers and logic; requires ≥4.7µF ceramic decoupling. |
| VCC (24) | Bias supply input | Tied to PVCC via 10Ω + 0.1µF RC filter - filters noise from internal LDO to stabilize control circuitry and reference. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual N-MOSFETs | rDS(ON) = 180mΩ (high-side) / 90mΩ (low-side) at VPVCC = 5V - eliminates external FETs and drivers, reducing BOM count and footprint by >40% vs. controller-only solutions. |
| Programmable switching frequency | 500kHz–1.2MHz via single RT resistor - enables trade-off between inductor size (smaller at 1.2MHz) and conduction losses (lower at 500kHz). |
| Master/slave synchronization | Supports up to six synchronized channels - eliminates beat frequencies in multi-rail systems like GPU memory banks, improving EMI compliance. |
| Start-up with pre-biased output | Allows safe turn-on when output already holds voltage - prevents reverse current flow into powered loads, critical for hot-swap and rail-sequencing applications. |
| Lossless overcurrent protection | Detects peak current via MOSFET rDS(ON) - avoids sense-resistor power loss and layout sensitivity, preserving efficiency and accuracy. |
| Bi-directional EN pin | Enables coordinated fault shutdown across multiple ISL8502IRZ devices - simplifies system-level fault management without external logic. |
Applications
| Graphics Card GPU Supply | ASIC Core Voltage Regulation |
|---|---|
|
Use Scenario: Delivering tightly regulated 0.85V–1.2V at up to 2A to GPU cores on PCIe add-in cards with strict ripple and transient response requirements. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing core power with fast transient response and ±1% accuracy across temperature. Use Value: Integrated MOSFETs and voltage-mode control achieve <5% output deviation during 1A/µs load steps, eliminating need for secondary LDOs. |
Use Scenario: Generating configurable I/O and core voltages (0.6V–3.3V) for FPGA or SoC-based ASICs in telecom and test equipment. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting dynamic voltage scaling (DVS) via FB resistor reconfiguration. Use Value: 0.6V reference and ±1% regulation enable compliance with JEDEC DDR4/LPDDR4 VDDQ/VDDIO specs without external calibration. |
| Embedded Processor I/O Rails | Multi-Rail Point-of-Load System |
|
Use Scenario: Powering ARM Cortex-A/M series processor I/O domains (1.8V, 3.3V) in industrial gateways where board space is constrained. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing discrete controller + dual-MOSFET solutions. Use Value: 4mm × 4mm QFN package with four VIN/PHASE/PGND pins reduces total solution area by 35% vs. comparable 3mm × 3mm controllers + external FETs. |
Use Scenario: Synchronizing six independent 1.0V/1.2V/1.8V rails on a high-density server motherboard to minimize conducted EMI. IC Role / Device Role / Timing Role: Master/slave-configurable buck regulator enabling deterministic phase alignment across all channels. Use Value: SYNCH pin synchronization reduces peak EMI amplitude by >15dB compared to unsynchronized operation at 500kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2307DN-LF-Z | 2A, 4.5–26V input, fixed 500kHz fSW, no master/slave sync, no bi-directional EN | Lacks multi-rail synchronization and fault-propagation capability; suited for single-rail, cost-sensitive designs | Choose MP2307DN-LF-Z when only basic 2A buck functionality is needed and board space permits larger external components. |
| TPS54202DRCT | 2A, 4.5–28V input, 400kHz–2.5MHz fSW, integrated MOSFETs, but no lossless OCP or PGOOD delay | Offers wider input range and higher fSW ceiling, but lacks ISL8502IRZ's 250ms PGOOD delay and thermal recovery hysteresis | Choose TPS54202DRCT for higher-input-voltage systems (>14V) where precise power-good timing is non-critical. |
Compared with MP2307DN-LF-Z and TPS54202DRCT, the ISL8502IRZ uniquely combines master/slave synchronization, bi-directional EN fault signaling, and lossless rDS(ON) overcurrent protection - making it optimal for multi-rail, thermally dense, and fault-coordinated applications like GPU power delivery and ASIC PoL systems.
Availability
ISL8502IRZ is available at Aetrix Electronics and suitable for graphics card GPU supplies, ASIC core voltage regulation, and embedded processor I/O rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8502IRZ 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 is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and infrastructure markets.
The ISL8502IRZ belongs to Renesas' legacy Intersil power management portfolio, designed specifically for high-density, multi-rail point-of-load DC/DC conversion in computing and graphics applications where integration, thermal performance, and synchronization are critical.
FAQ
What is the absolute maximum input voltage rating for the ISL8502IRZ?
The ISL8502IRZ has an absolute maximum VIN rating of +16.5V, but the recommended operating range is 5.5V to 14V. Exceeding 14V risks violating the 15.5V maximum voltage stress limit across the internal MOSFETs under transient conditions, potentially causing premature failure. For 5V ±10% input operation, VIN must be tied directly to VCC per datasheet Figure 2.
How does the ISL8502IRZ implement overcurrent protection without external sense resistors?
The ISL8502IRZ uses lossless rDS(ON) current sensing on both its integrated high-side (180mΩ) and low-side (90mΩ) MOSFETs. It monitors voltage drop across each FET during conduction to detect peak current - eliminating external sense resistors, their associated power loss, and PCB layout sensitivity while maintaining ±10% OCP accuracy.
Can the ISL8502IRZ start up safely when the output voltage is already present (pre-biased)?
Yes, the ISL8502IRZ supports start-up with pre-biased output, as confirmed in Figure 26 of the datasheet. Its control architecture prevents reverse current flow into the output during soft-start, making it suitable for hot-swap and rail-sequencing applications where downstream circuitry may already be powered before the ISL8502IRZ enables.
What thermal protection behavior does the ISL8502IRZ exhibit during overload?
The ISL8502IRZ disables regulation when junction temperature reaches 150°C (thermal shutdown setpoint) and remains off until temperature falls below 130°C (thermal recovery setpoint), providing 20°C hysteresis to prevent oscillation. This behavior is fully integrated and requires no external components - ensuring robust protection in enclosed or high-ambient environments.
How many ISL8502IRZ devices can be synchronized in a master/slave configuration?
Up to six ISL8502IRZ devices can be synchronized in a single master/slave system: one master driving the SYNCH signal and up to five slaves receiving it. All slaves must use identical FS resistor values and tie M/S to GND via 5kΩ, while the master ties M/S to PVCC - enabling deterministic phase alignment to suppress beat frequencies in multi-rail systems.
ISL8502IRZ 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)
ISL8502IRZ FAQ
1.How can I place an order for ISL8502IRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8502IRZ 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 reliable?
The price and inventory of ISL8502IRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8502IRZ is usually 5 days.
3.What payment methods are accepted for ISL8502IRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8502IRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8502IRZ?
ISL8502IRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8502IRZ 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?
For technical support, including ISL8502IRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8502IRZ requirements.
6.How does Aetrix verify that ISL8502IRZ is sourced from the original manufacturer or authorized distributors?
All ISL8502IRZ 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 meets industry standards.
7.What is the process for return or replacement of ISL8502IRZ?
All ISL8502IRZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL8502IRZ, 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 part is unused and in its original packaging.
Return procedure for ISL8502IRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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