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Renesas ISL8018IRAJZ-TS2490
- Part No.:
- ISL8018IRAJZ-TS2490
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL8018IRAJZ-TS2490.pdf
- Description:
- IC REG BUCK ADJ 8A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,565
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Product details
Overview
ISL8018IRAJZ-TS2490 from Renesas Electronics (formerly Intersil) is a monolithic synchronous buck regulator delivering up to 8A continuous output current from a 2.7V–5.5V input, with adjustable output voltage from 0.6V to VIN, 1MHz default switching frequency, and integrated P/N-channel MOSFETs achieving up to 97% efficiency in PWM mode. It serves as a point-of-load (POL) power supply for microcontrollers, FPGAs, and DSPs in space-constrained industrial and portable systems.
For engineers reviewing the ISL8018IRAJZ-TS2490 datasheet, ISL8018IRAJZ-TS2490 pinout, ISL8018IRAJZ-TS2490 application, or ISL8018IRAJZ-TS2490 equivalent, key selection criteria include its 20-lead 3×4 QFN package with exposed thermal pad, adjustable current limit (3A/5A/8A via ISET), prebias start capability, and dual-mode operation (PWM/PFM) with external synchronization support up to 4MHz.
Technical Context
The ISL8018IRAJZ-TS2490 employs peak current-mode control with slope compensation (360mV/Ts) for fast transient response and loop stability. Its internal transconductance error amplifier (100µA/V with internal compensation, 200µA/V with external) interfaces with an adjustable 0.6V reference and supports both internal (1ms) and capacitor-adjustable soft-start.
It integrates low-RDS(on) MOSFETs (P-FET: 31–55mΩ, N-FET: 19–50mΩ), enables 100% duty-cycle operation (<250mV dropout at 8A), and implements hiccup-mode short-circuit protection triggered after 17 consecutive overcurrent events, plus reverse-current protection and thermal shutdown at 150°C with 25°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A continuous - supports high-power digital loads like FPGAs without external current boosting. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (3.0–4.2V), USB 5V, and 3.3V system rails. |
| Switching Frequency | 500kHz–4MHz adjustable - enables EMI-sensitive designs and allows optimization of inductor size vs. efficiency. |
| Efficiency | Up to 97% at 1.8V/8A (5VIN, PWM) - minimizes thermal load and extends battery life in portable instruments. |
| Quiescent Current | 70µA in PFM no-load mode - critical for always-on subsystems requiring ultra-low standby power. |
| Thermal Resistance | θJA = 42°C/W, θJC = 5°C/W - exposed pad enables direct thermal coupling to PCB ground plane for high-power dissipation. |
| Protection Features | Overcurrent (hiccup), overtemperature (150°C), reverse current, UVLO (2.7V), and soft-stop discharge - ensures robust operation under fault conditions. |
Pinout & Package
The ISL8018IRAJZ-TS2490 is housed in a RoHS-compliant, lead-free 20-lead 3×4 mm QFN package (PKG DWG L20.3x4) with an exposed thermal pad that must be soldered to SGND for optimal electrical performance and thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,19,20 PGND | Power ground return path | Low-inductance connection point for high-current switch node return; must be tied to thermal pad and system GND plane. |
| 2,3,4 PHASE | Switching node | Connects directly to inductor; carries high di/dt current; requires short, wide copper trace to minimize ringing. |
| 5,6,7 VIN | Main input supply | Accepts 2.7–5.5V; requires two 22µF ceramic capacitors placed close to pins for high-frequency decoupling. |
| 8 PG | Open-drain power-good indicator | Signals regulation status after 1ms delay; requires external 10kΩ–100kΩ pull-up to VIN for logic-level output. |
| 9 SYNCOUT | Master clock output | 250µA current-source pulse synchronized to internal clock or SYNCIN; used to daisy-chain multiple ISL8018s and eliminate beat frequencies. |
| 10 SYNCIN | Mode/sync input | Logic-high = PWM mode; logic-low = PFM mode; external clock input (500kHz–4MHz) enables system-wide timing coordination. |
| 11 EN | Enable control | Active-high; initiates soft-start on rising edge; forces soft-stop discharge when pulled low. |
| 12 FS | Frequency set | Resistor-to-GND sets switching frequency (500kHz–4MHz); tied to VIN for default 1MHz with internal compensation. |
| 13 VSET | Voltage margining control | SGND = −10%, floating = nominal, VIN = +10% output adjustment - supports system-level voltage tolerance testing. |
| 14 ISET | Current limit select | SGND = 3A, VIN = 5A, floating = 8A peak current limit - configures OCP threshold without external components. |
| 15 SS | Soft-start timing | SGND = 1ms internal ramp; capacitor-to-SGND adjusts ramp time (≤33nF); disables soft-stop if externally biased. |
| 16 COMP | Compensation node | Transconductance amplifier output; tied to SGND when FS = VIN (internal compensation); connects to external RC network otherwise. |
| 17 VFB | Feedback input | Monitors output via resistor divider; sets regulated voltage (0.6V–VIN); also determines PG window comparator thresholds. |
| 18 SGND | Signal ground reference | Separate low-noise ground for feedback, compensation, and logic pins; must connect to exposed pad and system GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N MOSFETs | Eliminates external power switches; reduces BOM count and layout area while enabling <250mV dropout at full 8A load. |
| Adjustable current limit | Three discrete settings (3A/5A/8A) via ISET pin simplify design reuse across different load profiles without component changes. |
| Prebias start capability | Allows safe startup into precharged output (e.g., hot-swap or backup rail scenarios) without damaging downstream circuitry. |
| Dual PWM/PFM operation | Automatically transitions to PFM at light loads to maintain >85% efficiency down to 10mA, extending battery runtime. |
| External synchronization | SYNCIN/SYNCOUT interface enables deterministic phase alignment of multiple converters to suppress conducted EMI peaks. |
| Soft-stop output discharge | Internal 100Ω switch actively discharges output capacitor during shutdown - prevents unintended reset or latch-up in sequenced systems. |
Applications
| DC/DC POL Modules | µC/µP, FPGA and DSP Power |
|---|---|
Use Scenario: Compact, high-current DC/DC modules for telecom line cards and industrial PLCs requiring stable 1.2V–3.3V rails at up to 8A. IC Role / Device Role / Timing Role: Primary synchronous buck controller providing regulated POL voltage with fast load-step response and thermal derating support. Use Value: Integrated MOSFETs and 3×4 mm QFN reduce module footprint to <96.8mm² while maintaining 97% peak efficiency and hiccup-mode fault recovery. | Use Scenario: Core and I/O power delivery for Xilinx Artix-7 FPGAs and ARM Cortex-A series microprocessors in embedded vision systems. IC Role / Device Role / Timing Role: High-efficiency step-down regulator supplying configurable core voltage (0.6V–1.5V) with ±10% margining for validation testing. Use Value: Prebias start and soft-stop discharge ensure clean power sequencing; 1MHz default frequency balances EMI and inductor size for dense PCB layouts. |
| Plug-in DC/DC Modules for Routers and Switchers | Portable Instruments |
Use Scenario: Hot-pluggable midplane power modules in enterprise Ethernet switches supporting dynamic load changes up to 8A. IC Role / Device Role / Timing Role: Robust POL regulator with overtemperature and short-circuit protection, synchronized to system clock via SYNCIN to reduce noise coupling. Use Value: 4MHz sync capability allows precise phase shifting between adjacent modules to cancel ripple summation and lower RMS input current. | Use Scenario: Battery-powered handheld test equipment (e.g., oscilloscope front-ends, spectrum analyzers) requiring ultra-low quiescent current and stable 1.8V/3.3V rails. IC Role / Device Role / Timing Role: Main power converter operating in PFM mode during standby, transitioning to PWM under active measurement loads. Use Value: 70µA no-load IQ extends operational time on single-cell Li-ion; 100% duty-cycle operation maintains regulation even as battery drops to 2.7V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54821RHLR | 6A max output, 4.5–20V input, integrated MOSFETs, 300kHz–2MHz adjustable frequency, 12µA shutdown current | Higher input range suits 12V intermediate bus; lower current rating limits use in 8A FPGA core rails | Select when input exceeds 5.5V or ultra-low shutdown IQ is prioritized over output current capability. |
| MP2384CGG-Z | 8A output, 4.5–18V input, 500kHz–2.5MHz frequency, 2.5µA shutdown current, no PFM mode | Wider VIN supports 12V systems but lacks PFM efficiency at light loads; no prebias start or voltage margining | Choose for cost-sensitive 12V-to-3.3V conversion where light-load efficiency and advanced sequencing are not required. |
Compared with TPS54821RHLR and MP2384CGG-Z, the ISL8018IRAJZ-TS2490 uniquely combines 8A output, 2.7–5.5V input compatibility, PFM/PWM dual-mode operation, and built-in voltage margining-making it optimal for Li-ion-powered, space-constrained digital loads requiring both high efficiency and flexible system validation.
Availability
ISL8018IRAJZ-TS2490 is available at Aetrix Electronics and suitable for DC/DC POL modules, µC/FPGA power delivery, and portable instrument designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8018IRAJZ-TS2490 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 trusted embedded design innovation, with expertise in analog power management, microcontrollers, and automotive SoCs.
The ISL8018 product line was originally developed by Intersil and acquired by Renesas to strengthen its high-efficiency DC/DC portfolio targeting point-of-load power for computing, communications, and portable electronics.
FAQ
What is the maximum continuous output current supported by the ISL8018IRAJZ-TS2490?
The ISL8018IRAJZ-TS2490 supports up to 8A continuous output current under recommended operating conditions (TA = –40°C to +85°C, VIN = 2.7V–5.5V). This rating assumes proper PCB thermal design-including connection of the exposed pad to a solid SGND plane with multiple vias-and operation within the specified ambient temperature range. Derating applies above +85°C ambient.
How does the ISL8018IRAJZ-TS2490 handle startup into a prebiased output?
The ISL8018IRAJZ-TS2490 supports prebias start: when enabled, it monitors the VFB voltage at power-up and enters Skip mode during soft-start to avoid sinking current from a precharged output. This prevents reverse current flow and potential damage to downstream circuitry. The feature is active by default and requires no external configuration.
Can the ISL8018IRAJZ-TS2490 be synchronized to an external clock source?
Yes, the ISL8018IRAJZ-TS2490 accepts an external clock signal on the SYNCIN pin, supporting synchronization from 500kHz to 4MHz. The rising edge of the external clock triggers the PHASE node, and the internal SYNCOUT pin can drive other ISL8018IRAJZ-TS2490 devices to enable phase-shifted operation and reduce system-level ripple.
What are the voltage margining options available on the ISL8018IRAJZ-TS2490?
The ISL8018IRAJZ-TS2490 provides ±10% output voltage margining via the VSET pin: connecting VSET to SGND yields –10%, leaving it floating gives nominal regulation, and tying it to VIN results in +10%. This allows system-level functional testing across voltage tolerances without modifying the feedback resistor network.
Does the ISL8018IRAJZ-TS2490 include output discharge functionality during shutdown?
Yes, the ISL8018IRAJZ-TS2490 features soft-stop output discharge: when the EN pin is pulled low or VIN falls below UVLO, an internal 100Ω switch connects the output to PGND, actively discharging the output capacitor. This behavior is disabled only if an external capacitor is connected to the SS pin.
ISL8018IRAJZ-TS2490 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 8A
- Frequency - Switching:
- 500kHz ~ 4MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
ISL8018IRAJZ-TS2490 FAQ
1.How can I place an order for ISL8018IRAJZ-TS2490 through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8018IRAJZ-TS2490 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 ISL8018IRAJZ-TS2490 reliable?
The price and inventory of ISL8018IRAJZ-TS2490 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8018IRAJZ-TS2490 is usually 5 days.
3.What payment methods are accepted for ISL8018IRAJZ-TS2490?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8018IRAJZ-TS2490 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8018IRAJZ-TS2490?
ISL8018IRAJZ-TS2490 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8018IRAJZ-TS2490 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 ISL8018IRAJZ-TS2490?
For technical support, including ISL8018IRAJZ-TS2490 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8018IRAJZ-TS2490 requirements.
6.How does Aetrix verify that ISL8018IRAJZ-TS2490 is sourced from the original manufacturer or authorized distributors?
All ISL8018IRAJZ-TS2490 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 ISL8018IRAJZ-TS2490 meets industry standards.
7.What is the process for return or replacement of ISL8018IRAJZ-TS2490?
All ISL8018IRAJZ-TS2490 units undergo pre-shipment inspection (PSI). If there is an issue with ISL8018IRAJZ-TS2490, 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 ISL8018IRAJZ-TS2490 part is unused and in its original packaging.
Return procedure for ISL8018IRAJZ-TS2490:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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