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Renesas ISL8018IRAJZ-T7A
- Part No.:
- ISL8018IRAJZ-T7A
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL8018IRAJZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 8A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,232
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Product details
Overview
ISL8018IRAJZ-T7A from Renesas Electronics is a monolithic synchronous buck regulator delivering up to 8A continuous output current from 2.7V–5.5V input, with adjustable 0.6V–VIN output voltage, 500kHz–4MHz programmable switching frequency, and integrated P/N-channel MOSFETs (45mΩ/35mΩ typical at 5V). It serves as a high-efficiency point-of-load power supply for FPGA core rails in telecom infrastructure equipment.
For engineers reviewing the ISL8018IRAJZ-T7A datasheet, ISL8018IRAJZ-T7A pinout, ISL8018IRAJZ-T7A application, or ISL8018IRAJZ-T7A equivalent, key selection criteria include its 100% duty-cycle capability (<250mV dropout at 8A), prebias start support, ±10% output margining, and thermal performance enabled by the 3x4 QFN exposed-pad package.
Technical Context
The ISL8018IRAJZ-T7A uses peak current-mode control with slope compensation (360mV/Ts) for fast transient response and loop stability. Its dual-mode operation-PWM (forced continuous) or PFM (discontinuous at light load)-is selected via the SYNCIN pin, enabling noise-sensitive or efficiency-critical design trade-offs.
Internal protection includes hiccup-mode short-circuit response triggered after 17 consecutive overcurrent detections, reverse-current limiting (−3A threshold), and thermal shutdown at 150°C with 25°C hysteresis. The 0.6V reference is trimmed to ±1% over temperature, and VFB bias current remains below 0.1µA for precision feedback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A continuous - supports high-power FPGA and µP core rails without external MOSFETs. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, 3.3V, and 5V intermediate bus architectures. |
| Switching Frequency | 500kHz to 4MHz - adjustable via FS resistor; default 1MHz enables compact magnetics and low EMI. |
| Efficiency | Up to 97% at 5VIN/1.8VOUT/4A - minimizes thermal load in dense PCB layouts. |
| Duty Cycle | 0% to 100% - enables ultra-low dropout operation (<250mV at 8A), critical for low-VOUT applications. |
| Quiescent Current | 70µA in PFM no-load - extends battery life in portable instruments and test equipment. |
| Thermal Resistance | θJA = 42°C/W - achieved via 20-lead 3×4mm QFN with exposed pad tied to SGND. |
Pinout & Package
ISL8018IRAJZ-T7A is housed in a RoHS-compliant, lead-free 20-lead 3mm × 4mm QFN package (PKG DWG L20.3x4) with an exposed thermal pad requiring direct connection to SGND for optimal electrical and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19, 20 (PGND) | Power ground return path | Low-inductance connection point for high di/dt switch node currents; must be tied to thermal pad and system PGND plane. |
| 2, 3, 4 (PHASE) | Switching node | Direct connection to inductor; carries full AC switching current and high dv/dt transients. |
| 5, 6, 7 (VIN) | Main input supply | Accepts 2.7V–5.5V; requires two 22µF ceramic capacitors placed close to pins for low-ESR bulk storage. |
| 8 (PG) | Open-drain power-good indicator | Signals regulation status after 1ms delay; requires external 10kΩ–100kΩ pull-up to VIN. |
| 10 (SYNCIN) | Mode control/synchronization input | Logic-high = PWM mode; logic-low = PFM mode; external clock input up to 4MHz with master-slave phase shifting. |
| 11 (EN) | Enable/disable control | Active-high; initiates soft-start on rising edge and discharges output via internal 100Ω switch when low. |
| 12 (FS) | Frequency set | Resistor-to-SGND sets fSW from 500kHz–4MHz; tied to VIN for default 1MHz with internal compensation. |
| 14 (ISET) | Current limit configuration | Floating = 8A peak limit; VIN = 5A; SGND = 3A - enables scalable current protection across designs. |
| 15 (SS) | Soft-start timing control | SGND = 1ms internal ramp; capacitor to SGND adjusts ramp time; max 33nF ensures fault recovery. |
| 16, 17 (COMP/VFB) | Compensation/feedback inputs | VFB senses output divider; COMP used only with external compensation - internal compensation requires tying COMP to SGND. |
| 18 (SGND) | Signal ground reference | Separate from PGND; provides clean reference for error amplifier and analog blocks; must connect to exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-MOSFETs | 45mΩ/35mΩ RDS(on) at 5V enables >97% efficiency and eliminates external power stage layout complexity. |
| Prebias start capability | Supports startup into precharged output (e.g., hot-swap systems) without damaging downstream circuitry or causing output overshoot. |
| Adjustable output margining | ±10% voltage adjustment via VSET pin allows system-level calibration and margin testing without hardware changes. |
| Programmable soft-start | 1ms internal or capacitor-adjustable ramp prevents inrush current damage to input capacitors and load components. |
| Reverse current protection | Disables both FETs if inductor current goes negative beyond −3A for 4 cycles, preventing uncontrolled discharge of output capacitors. |
Applications
| DC/DC POL Modules | µC/µP, FPGA and DSP Power |
|---|---|
Use Scenario: Compact, high-density DC/DC modules for telecom line cards requiring stable 1.2V/1.8V/2.5V rails at up to 8A. IC Role / Device Role / Timing Role: Primary synchronous buck controller providing regulated output with tight load regulation and fast transient response. Use Value: Integrated MOSFETs and 3×4mm QFN reduce module footprint to <96.8mm² while maintaining 97% peak efficiency. | Use Scenario: Core voltage supply for Xilinx Artix-7 FPGAs in industrial control PLCs operating from 3.3V intermediate bus. IC Role / Device Role / Timing Role: Point-of-load regulator delivering dynamically scaled core voltage with prebias start during FPGA reconfiguration. Use Value: 100% duty cycle and 70µA quiescent current enable deep-sleep mode support and rapid wake-up without rail collapse. |
| Plug-in DC/DC Modules for Routers | Portable Instruments |
Use Scenario: Hot-pluggable 12V-to-1.2V/8A power modules in enterprise routers where EMI compliance and thermal density are critical. IC Role / Device Role / Timing Role: Synchronized buck converter operating in PWM mode at 2MHz to avoid AM radio band interference. Use Value: External synchronization (SYNCIN/SYNCOUT) enables multi-phase interleaving across adjacent modules, reducing input ripple by >70%. | Use Scenario: Battery-powered handheld oscilloscope requiring ultra-low-noise 3.3V analog rail and efficient 1.8V digital rail from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-rail buck regulator configured in PFM mode for standby and PWM for active measurement cycles. Use Value: 70µA no-load IQ and 1.5% output voltage accuracy over −40°C to +85°C ensure long runtime and measurement repeatability. |
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 rated, 4.5V–20V input, 0.6V–5.5V output; uses external MOSFETs; no prebias start. | Suitable for higher-input-voltage industrial supplies but lacks integrated FETs and prebias capability. | Select when input exceeds 5.5V or when discrete FET optimization is required; not drop-in for ISL8018IRAJZ-T7A. |
| MP2384CGQ-P | 8A rated, 4.5V–18V input, fixed 1.2V output; integrated FETs; no adjustable frequency or margining. | Targeted at cost-sensitive fixed-output applications like SSD power; lacks flexibility for multi-rail FPGA designs. | Choose for simple 1.2V/8A rails where programmability and margining are unnecessary; requires redesign for adjustable VOUT. |
Compared with TPS54821RHLR and MP2384CGQ-P, the ISL8018IRAJZ-T7A uniquely combines 8A integration, 2.7V–5.5V input range, prebias start, ±10% margining, and 500kHz–4MHz frequency tuning - making it optimal for space-constrained, battery-aware, and multi-rail embedded systems.
Availability
ISL8018IRAJZ-T7A is available at Aetrix Electronics and suitable for DC/DC POL modules, FPGA power delivery, and portable instrumentation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ISL8018IRAJZ-T7A 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 is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and infrastructure markets.
The ISL8018 product line delivers high-efficiency, monolithic synchronous buck regulators optimized for point-of-load power in space-constrained, thermally demanding applications such as FPGA, µP, and DSP core supplies.
FAQ
What is the maximum continuous output current supported by the ISL8018IRAJZ-T7A?
The ISL8018IRAJZ-T7A supports up to 8A continuous output current under recommended operating conditions (TA ≤ +85°C, proper thermal layout). This rating assumes use of the 3×4mm QFN package with exposed pad soldered to SGND and adequate PCB copper area. Peak current limit is configurable up to 15.8A via the ISET pin, but sustained operation above 8A requires derating based on ambient temperature and airflow.
Does the ISL8018IRAJZ-T7A support startup into a prebiased output voltage?
Yes, the ISL8018IRAJZ-T7A supports prebias start - it can safely begin regulation when the output is already charged to a voltage within the target regulation range. This behavior is enabled by internal circuitry that monitors VFB during soft-start and disables gate drive until the error amplifier stabilizes, preventing reverse current flow or output overshoot. No external components are required to activate this feature.
How is the switching frequency programmed on the ISL8018IRAJZ-T7A?
The switching frequency of the ISL8018IRAJZ-T7A is programmed using a resistor (RFS) connected between the FS pin and SGND. Frequency ranges from 500kHz to 4MHz per the equation fOSC(kHz) = 220×10³/RT(kΩ) − 14. When FS is tied to VIN, the device defaults to 1MHz with internal compensation. The FS pin must not be left floating, and resistor tolerance directly impacts frequency accuracy.
What protection features are integrated into the ISL8018IRAJZ-T7A?
The ISL8018IRAJZ-T7A integrates peak current limiting, hiccup-mode short-circuit protection (triggered after 17 consecutive OC events), overtemperature shutdown (150°C, 25°C hysteresis), reverse current protection (−3A threshold), undervoltage lockout (2.7V rising), and soft-stop output discharge via an internal 100Ω switch. All protections are fully autonomous and require no external components to function.
Can the ISL8018IRAJZ-T7A be synchronized to an external clock source?
Yes, the ISL8018IRAJZ-T7A accepts an external clock signal on the SYNCIN pin for synchronization from 500kHz to 4MHz. The rising edge of SYNCIN triggers the PHASE node, and the device supports master-slave phase shifting using a small capacitor (e.g., 10–200pF) between SYNCOUT of the master and SYNCIN of the slave. SYNCIN has a 1MΩ internal pull-down, so it must be actively driven for reliable synchronization.
ISL8018IRAJZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-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):
- 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-T7A FAQ
1.How can I place an order for ISL8018IRAJZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8018IRAJZ-T7A 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-T7A reliable?
The price and inventory of ISL8018IRAJZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8018IRAJZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL8018IRAJZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8018IRAJZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8018IRAJZ-T7A?
ISL8018IRAJZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8018IRAJZ-T7A 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-T7A?
For technical support, including ISL8018IRAJZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8018IRAJZ-T7A requirements.
6.How does Aetrix verify that ISL8018IRAJZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL8018IRAJZ-T7A 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-T7A meets industry standards.
7.What is the process for return or replacement of ISL8018IRAJZ-T7A?
All ISL8018IRAJZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL8018IRAJZ-T7A, 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-T7A part is unused and in its original packaging.
Return procedure for ISL8018IRAJZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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