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Renesas ISL8018IRAJZ-T
- Part No.:
- ISL8018IRAJZ-T
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL8018IRAJZ-T.pdf
- Description:
- IC REG BUCK ADJ 8A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,064
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Product details
Overview
ISL8018IRAJZ-T 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. It integrates low-RDS(on) P- and N-channel MOSFETs, supports 500kHz–4MHz switching frequency, and features prebias start, reverse current protection, and over-temperature shutdown - deployed in FPGA and µP core power supplies.
For engineers reviewing the ISL8018IRAJZ-T datasheet, ISL8018IRAJZ-T pinout, ISL8018IRAJZ-T application, or ISL8018IRAJZ-T equivalent, key selection considerations include its 8A output capability, 100% duty-cycle operation for <250mV dropout at full load, adjustable current limit via ISET pin, forced-continuous/DCM mode selection, and thermal performance enabled by the 3x4 QFN exposed-pad package.
Technical Context
The ISL8018IRAJZ-T employs peak current-mode control with slope compensation (360mV/Ts) for fast transient response and loop stability. Its dual-MOSFET architecture uses a 31mΩ high-side and 19mΩ low-side switch at 5V input, enabling up to 97% efficiency at 5VIN/1.8VOUT/8A.
It supports three operating modes: PWM (SYNCIN ≥0.8V), PFM (SYNCIN ≤0.4V), and external synchronization (500kHz–4MHz). The 1ms internal soft-start (SS = SGND) and soft-stop discharge via 100Ω internal switch ensure controlled startup/shutdown without output voltage overshoot or residual charge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A continuous - supports high-current FPGA, DSP, and microprocessor core rails without external pass devices. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, 3.3V, and 5V intermediate bus architectures. |
| Output Voltage Range | 0.6V to VIN - enables precise core voltage scaling down to sub-1V logic domains. |
| Switching Frequency | 500kHz–4MHz (adjustable via FS resistor) - allows optimization of size (higher fSW) vs. efficiency (lower fSW) and EMI filtering requirements. |
| Quiescent Current | 70µA in PFM no-load - extends battery runtime in portable instrumentation and always-on subsystems. |
| Thermal Resistance θJA | 42°C/W - achieved via 20-lead 3×4mm QFN with exposed pad tied to SGND, enabling >6W power dissipation at +85°C ambient. |
| Protection Features | Overcurrent (hiccup mode), over-temperature (150°C shutdown), UVLO (2.7V rising), reverse current blocking, and soft-stop discharge - ensures robustness in unattended embedded systems. |
Pinout & Package
The ISL8018IRAJZ-T is housed in a RoHS-compliant, lead-free 20-lead 3×4mm QFN package (PKG DWG L20.3x4) with an exposed thermal pad requiring connection to SGND for optimal electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,19,20 PGND | Power ground return path for high-current switching node | Must be connected to low-impedance PCB ground plane; multiple vias under EPAD required for thermal management. |
| 2,3,4 PHASE | Switching node connecting internal high-side and low-side MOSFETs to inductor | High di/dt node - requires short, wide copper trace and local ceramic decoupling to minimize ringing and EMI. |
| 5,6,7 VIN | Main input supply rail (2.7V–5.5V) | Requires two 22µF ceramic capacitors placed close to pins to suppress input ripple and support peak current delivery. |
| 8 PG | Open-drain power-good status indicator | Signals regulation within ±10% VOUT after 1ms delay; requires external 10kΩ–100kΩ pull-up to VIN. |
| 10 SYNCIN | Mode control and external clock synchronization input | Pull high for PWM, low for PFM, or drive with external clock (500kHz–4MHz) for multi-rail phase alignment. |
| 11 EN | Enable/disable control with soft-stop discharge | Drives low to shut down and actively discharge output capacitor via internal 100Ω switch. |
| 14 ISET | Peak current limit configuration (3A/5A/8A) | Floating = 8A default; connect to SGND for 3A or VIN for 5A - sets OCP threshold and skip current limit. |
| 16 COMP / 17 VFB | Error amplifier output / feedback voltage sense | VFB sets output voltage via resistor divider; COMP used only with external compensation (FS ≠ VIN); otherwise tie COMP to SGND. |
| 18 SGND | Signal ground reference for feedback and control circuitry | Must be isolated from noisy PGND until joined at single point near EPAD to avoid noise coupling into regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-channel MOSFETs | 31mΩ/19mΩ RDS(on) at 5VIN - eliminates external power switches and reduces BOM count while maintaining >95% efficiency at 5A. |
| Adjustable current limit (ISET) | Three discrete settings (3A/5A/8A) via simple pin strapping - enables design reuse across varying load profiles without layout change. |
| Prebias start capability | Starts regulation even when output is precharged to any voltage between 0.6V and VOUT - prevents reverse current flow and enables hot-swap and sequencing-critical applications. |
| 100% duty-cycle operation | Enables <250mV dropout at 8A - supports low-VOUT rails (e.g., 1.0V) from marginal input sources like aging batteries or drooping intermediate buses. |
| External synchronization with phase shift | SYNCOUT current source (250µA) and SYNCIN edge-trigger enable master-slave timing alignment - reduces system-level ripple and beat frequencies in multi-phase POL designs. |
Applications
| DC/DC POL Modules | µC/µP, FPGA and DSP Power |
|---|---|
Use Scenario: Compact, high-density point-of-load converters on server motherboard VRMs or telecom line cards. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering core voltage (e.g., 0.85V @ 6A) with tight regulation and fast load-step response. Use Value: 97% peak efficiency and 42°C/W θJA allow full 8A operation within 12mm² footprint without forced air cooling. | Use Scenario: Powering ARM-based SoCs or Xilinx Artix-7 FPGAs in industrial edge controllers with strict thermal budgets. IC Role / Device Role / Timing Role: Core rail regulator with programmable soft-start (1ms–10ms) and power-good signaling for safe processor boot sequence. Use Value: Prebias start and reverse current protection prevent brownout during hot-plug events and ensure deterministic reset behavior. |
| Portable Instruments | Li-ion Battery Powered Devices |
Use Scenario: Handheld oscilloscopes and spectrum analyzers requiring ultra-low-noise analog rails and long battery life. IC Role / Device Role / Timing Role: Low-quiescent (70µA) PFM-mode regulator for 3.3V auxiliary supply, synchronized to main 1MHz PWM rail to suppress beat frequencies. Use Value: Dual-mode operation (PWM/ PF M) delivers >90% efficiency from 1mA to 8A, extending runtime without sacrificing transient performance. | Use Scenario: Medical wearables using single-cell Li-ion (2.7–4.2V) to power Bluetooth SoCs and sensors at 1.8V/3.3V. IC Role / Device Role / Timing Role: Input-voltage adaptive buck converter maintaining regulation across full battery discharge curve with UVLO hysteresis (2.4V falling). Use Value: 100% duty cycle and 2.7V UVLO enable usable runtime down to 2.8V cell voltage, maximizing energy extraction. |
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 | 8A output, 4.5–20V input, fixed 500kHz/700kHz/1MHz options, no PFM mode, higher quiescent (120µA) | Better suited for higher-input industrial rails; lacks light-load efficiency optimization and prebias start | Select when input exceeds 5.5V or when strict fixed-frequency EMI control is required over efficiency at light loads. |
| MP2384CGQ-P | 8A output, 4.5–18V input, 500kHz–2.2MHz sync range, no ISET pin, integrated boot diode, 120µA IQ | Designed for wider-input DC/DC modules; missing margining, soft-stop discharge, and negative current protection | Choose for cost-sensitive 12V intermediate bus applications where extended feature set is not required. |
Compared with TPS54821RHLR and MP2384CGQ-P, the ISL8018IRAJZ-T provides superior light-load efficiency via PFM mode, true prebias start, and comprehensive protection (reverse current, hiccup OCP, soft-stop), making it optimal for battery-powered and thermally constrained FPGA/core-rail designs - albeit limited to ≤5.5V input.
Availability
ISL8018IRAJZ-T is available at Aetrix Electronics and suitable for FPGA power delivery, portable instrumentation, and Li-ion powered edge devices requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for ISL8018IRAJZ-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 is a global semiconductor leader formed from the merger of Renesas Technology and NEC Electronics, specializing in microcontrollers, analog power ICs, and embedded solutions for automotive, industrial, and IoT markets.
The ISL8018 belongs to Renesas' high-current synchronous buck regulator product line, engineered specifically for high-efficiency, low-noise, and thermally robust point-of-load power delivery in space-constrained embedded systems.
FAQ
What is the maximum continuous output current of the ISL8018IRAJZ-T?
The ISL8018IRAJZ-T delivers up to 8A continuous output current under recommended operating conditions (TA ≤ +85°C, proper PCB thermal design with exposed pad connected to SGND). This rating assumes adequate input capacitance (≥44µF), 1µH inductor, and 200mm² of 2oz copper on the PGND layer. Derating applies above +70°C ambient.
Does the ISL8018IRAJZ-T support prebiased output startup?
Yes, the ISL8018IRAJZ-T supports prebias start: it can safely regulate from an already charged output voltage (0.6V to VOUT) without forcing reverse current. This is enabled by internal circuitry that monitors inductor current zero-crossing and disables the low-side MOSFET during startup, preventing output discharge through the body diode.
How is the switching frequency configured on the ISL8018IRAJZ-T?
The ISL8018IRAJZ-T switching frequency is set by connecting a resistor (RFS) from the FS pin to SGND. With FS tied to VIN, it defaults to ~1MHz with internal compensation. Using Equation 1 from the datasheet (RT = (220 × 10³)/fOSC − 14), RFS values from 42.4kΩ (4MHz) to 402kΩ (520kHz) achieve the full 500kHz–4MHz range.
What protection features does the ISL8018IRAJZ-T include?
The ISL8018IRAJZ-T integrates overcurrent protection (hiccup mode after 17 consecutive faults), over-temperature shutdown (150°C with 25°C hysteresis), input undervoltage lockout (2.7V rising), reverse current blocking, soft-stop output discharge (via 100Ω internal switch), and negative current limiting (−3A threshold). All are fully autonomous and require no external components.
Can the ISL8018IRAJZ-T be synchronized to an external clock?
Yes, the ISL8018IRAJZ-T accepts an external clock signal on the SYNCIN pin (500kHz–4MHz) to synchronize switching edges across multiple regulators. Its SYNCOUT pin outputs a 250µA current pulse aligned to the internal or external clock's rising edge, enabling master-slave phase shifting using an external capacitor (e.g., 100pF yields ~30° shift at 1MHz).
ISL8018IRAJZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-T FAQ
1.How can I place an order for ISL8018IRAJZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8018IRAJZ-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 ISL8018IRAJZ-T reliable?
The price and inventory of ISL8018IRAJZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8018IRAJZ-T is usually 5 days.
3.What payment methods are accepted for ISL8018IRAJZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8018IRAJZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8018IRAJZ-T?
ISL8018IRAJZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8018IRAJZ-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 ISL8018IRAJZ-T?
For technical support, including ISL8018IRAJZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8018IRAJZ-T requirements.
6.How does Aetrix verify that ISL8018IRAJZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8018IRAJZ-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 ISL8018IRAJZ-T meets industry standards.
7.What is the process for return or replacement of ISL8018IRAJZ-T?
All ISL8018IRAJZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8018IRAJZ-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 ISL8018IRAJZ-T part is unused and in its original packaging.
Return procedure for ISL8018IRAJZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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