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Renesas ISL8018IRAJZ
- Part No.:
- ISL8018IRAJZ
- Manufacturer:
- Renesas
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
ISL8018IRAJZ.pdf
- Description:
- IC REG BUCK ADJ 8A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,163
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Product details
Overview
ISL8018IRAJZ from Renesas (formerly Intersil) is a monolithic synchronous buck regulator delivering up to 8A continuous output current from a 2.7V–5.5V input, with adjustable 0.6V–VIN output voltage, 1MHz default switching frequency, and integrated high-side P-channel and low-side N-channel MOSFETs. It serves as a primary POL converter for FPGA, µP, and DSP core supplies in space-constrained industrial and portable systems.
For engineers reviewing the ISL8018IRAJZ datasheet, ISL8018IRAJZ pinout, ISL8018IRAJZ application, or ISL8018IRAJZ equivalent, key selection considerations include its 8A current capability, 70µA quiescent current in PFM mode, 100% duty-cycle operation for <250mV dropout at full load, and configurable PWM/PFM mode via SYNCIN pin.
Technical Context
The ISL8018IRAJZ employs peak current-mode control with slope compensation (360mV/Ts) and an internal transconductance error amplifier (100µA/V with internal compensation). Its dual-MOSFET architecture features 45mΩ high-side and 35mΩ low-side ON-resistance at VIN = 5V, enabling fast transient response and stable loop behavior across 0–8A load range.
It supports three operational modes: forced PWM (SYNCIN ≥ 0.8V), automatic PFM (SYNCIN ≤ 0.4V), and external synchronization (500kHz–4MHz via SYNCIN). Current limiting is programmable (3A/5A/8A via ISET), and soft-start time is adjustable (1ms internal or capacitor-controlled) with prebias start capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 8A continuous - supports high-current digital loads without external MOSFETs or heatsinks. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, 3.3V, and 5V intermediate bus rails. |
| Output Voltage Range | 0.6V to VIN - enables core voltages down to sub-1V for modern processors and FPGAs. |
| Switching Frequency | Adjustable 500kHz–4MHz (default 1MHz) - allows optimization of size (higher fSW) vs. efficiency (lower fSW). |
| Quiescent Current | 70µA in PFM no-load - extends battery life in portable instruments and always-on subsystems. |
| Efficiency | Up to 97% at 5VIN/1.8VOUT/4A - minimizes thermal dissipation in dense PCB layouts. |
| Duty Cycle | 100% - enables ultra-low dropout (<250mV at 8A), critical for near-input-output voltage applications. |
Pinout & Package
The ISL8018IRAJZ is housed in a RoHS-compliant 20-lead 3mm × 4mm QFN package with exposed thermal pad (PKG DWG L20.3x4), optimized for low θJA = 42°C/W and high power density (<96.8mm² total footprint).
| 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 GND plane. |
| 2, 3, 4 | PHASE | Switching node connecting internal MOSFETs to external inductor; carries high di/dt current. |
| 5, 6, 7 | VIN | Main input supply (2.7V–5.5V); requires two 22µF ceramic capacitors directly to PGND. |
| 8 | PG | Open-drain power-good signal; indicates regulation status after 1ms delay; requires external pull-up to VIN. |
| 9 | SYNCOUT | 250µA current-source sync pulse output; used to synchronize multiple ISL8018IRAJZ devices and avoid beat frequencies. |
| 10 | SYNCIN | Mode control/sync input: logic high = PWM, logic low = PFM, external clock = synchronization master. |
| 11 | EN | Active-high enable; initiates soft-start on rising edge and discharges output via internal 100Ω switch when low. |
| 12 | FS | Frequency set pin; connects to GND via resistor (42.4kΩ–402kΩ) to program 500kHz–4MHz; tied to VIN for 1MHz default. |
| 13 | VSET | Output margining control: SGND = −10%, floating = nominal, VIN = +10% - enables system-level voltage tolerance testing. |
| 14 | ISET | Current limit configuration: SGND = 3A, VIN = 5A, floating = 8A - sets both peak and skip current thresholds. |
| 15 | SS | Soft-start timing control: SGND = 1ms internal ramp; capacitor to SGND adjusts ramp time (≤33nF). |
| 16, 17 | COMP / VFB | VFB is feedback input (0.6V reference); COMP is error amplifier output - used only with external compensation (FS ≠ VIN). |
| 18 | SGND | Signal ground reference for analog circuitry; must be isolated from PGND at single point and tied to EPAD. |
| EPAD | Thermal Pad | Exposed copper pad; must be soldered to SGND plane with multiple vias for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated MOSFETs | 45mΩ P-ch + 35mΩ N-ch at 5VIN - eliminates external power switches and reduces BOM count by ≥4 components. |
| Prebias Start Capability | Starts regulation even when output is precharged to target voltage - prevents reverse current and ensures reliable boot in multi-rail systems. |
| Programmable Current Limit | Three discrete settings (3A/5A/8A) via ISET pin - enables one IC design to support multiple output current requirements without layout change. |
| Hiccup-Mode Short-Circuit Protection | 17-cycle fault counter triggers auto-restart after eight soft-start delays - protects against sustained overloads without latch-off. |
| Reverse Current Protection | Active during shutdown and light-load PFM - blocks current flow from output to input, preserving battery charge in portable devices. |
| 100% Duty-Cycle Operation | Enables <250mV dropout at 8A - supports applications where VOUT ≈ VIN, such as post-regulation of DC/DC modules. |
Applications
| DC/DC POL Module | FPGA Core Supply |
|---|---|
|
Use Scenario: Compact, high-current point-of-load conversion in telecom line cards and modular servers. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering regulated 0.85V–1.2V at up to 8A to FPGA core rails. Use Value: 97% peak efficiency and 100% duty cycle minimize heat generation and enable single-layer thermal management in 1U chassis. |
Use Scenario: Powering Xilinx or Intel FPGA core voltage domains requiring tight regulation and fast transient response. IC Role / Device Role / Timing Role: Core voltage regulator with programmable soft-start and margining for FPGA configuration sequencing and validation. Use Value: ±10% VSET-adjustable margining supports system-level voltage tolerance testing per JEDEC JESD8-12 standards. |
| Li-ion Powered Instrument | Test & Measurement System |
|
Use Scenario: Battery-powered handheld oscilloscopes or spectrum analyzers requiring long runtime and low-noise supply. IC Role / Device Role / Timing Role: Main system regulator operating in PFM mode at light load to achieve 70µA quiescent current. Use Value: Discontinuous PFM operation reduces switching losses and EMI, extending battery life beyond 12 hours on single-cell Li-ion. |
Use Scenario: Precision analog front-end and ADC/DAC power in benchtop multimeters and signal generators. IC Role / Device Role / Timing Role: Low-noise, synchronized POL supply using external clock to eliminate beat frequencies between multiple rails. Use Value: SYNCIN/SYNCOUT capability enables deterministic phase alignment of up to 4 ISL8018IRAJZ regulators, suppressing inter-rail interference. |
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, 4.5–20V input, fixed 1.2V option; uses external MOSFETs; higher minimum input voltage. | Better suited for higher-input industrial rails; lacks prebias start and PFM mode. | Select when input exceeds 5.5V or when external MOSFET thermal isolation is required. |
| MP2384CGG-Z | 8A, 4.5–18V input, 600kHz–1.5MHz adjustable; no PFM mode; lower quiescent current (25µA) but no margining. | Optimized for cost-sensitive industrial converters; missing VSET/ISET configurability and SYNCOUT. | Select for fixed-frequency, non-synchronized 12V-input applications where margining and multi-device sync are unnecessary. |
Compared with TPS54821RHLR and MP2384CGG-Z, the ISL8018IRAJZ uniquely combines 2.7V–5.5V input compatibility, true PFM operation, ±10% margining, and master/slave synchronization-making it the only choice for low-voltage, battery-powered, and multi-rail synchronized designs.
Availability
ISL8018IRAJZ is available at Aetrix Electronics and suitable for FPGA core supplies, portable instrumentation, and test & measurement systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8018IRAJZ 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 acquired Intersil in 2017 and maintains full technical and manufacturing continuity for the ISL8018 product family. Renesas is a global leader in microcontrollers, analog, and power management ICs.
The ISL8018 series was designed specifically for high-efficiency, high-current point-of-load regulation in space-constrained portable and industrial electronics - emphasizing low quiescent current, robust protection, and flexible configuration.
FAQ
What is the maximum output current capability of the ISL8018IRAJZ?
The ISL8018IRAJZ delivers 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 layout with thermal vias under the EPAD and adequate input/output capacitance. Peak current limit is programmable via the ISET pin (3A/5A/8A), and the device enters hiccup-mode protection if sustained overload exceeds safe operating area limits.
Does the ISL8018IRAJZ support prebiased output startup?
Yes, the ISL8018IRAJZ supports prebias start: it can safely regulate into an already charged output capacitor without forcing reverse current. During startup, the controller monitors inductor current and disables the low-side MOSFET until the output voltage reaches regulation, preventing negative current flow. This behavior is confirmed in Figure 23 of the FN7889 datasheet and is enabled by default - no external components are required.
How is the switching frequency configured on the ISL8018IRAJZ?
The ISL8018IRAJZ switching frequency is set via the FS pin: tying FS to VIN configures 1MHz default operation with internal compensation; connecting FS to SGND through a resistor (42.4kΩ–402kΩ) programs 500kHz–4MHz. Equation 1 in the datasheet defines RT = (220 × 10³)/fOSC – 14 (kΩ). The FS pin must not float - an unconnected FS pin results in undefined frequency and potential instability.
What protection features does the ISL8018IRAJZ include?
The ISL8018IRAJZ integrates peak current limiting, hiccup-mode short-circuit protection (17-cycle fault counter), over-temperature shutdown (150°C trip, 25°C hysteresis), reverse current blocking, UVLO (2.7V rising threshold), and soft-stop output discharge via internal 100Ω switch. All protections are hardware-based and operate independently of external components or firmware, ensuring fail-safe behavior in mission-critical power systems.
Can multiple ISL8018IRAJZ devices be synchronized to reduce EMI?
Yes, the ISL8018IRAJZ supports master-slave synchronization via SYNCIN and SYNCOUT pins. A master device's SYNCOUT (250µA current pulse) drives a capacitor network into a slave's SYNCIN, enabling precise phase shifting (up to 360° at 1MHz). This eliminates beat frequencies and lowers peak EMI amplitude - validated in Figures 35 and 36 of FN7889. Synchronization range is 500kHz–4MHz with ≤140ns minimum on-time compliance.
ISL8018IRAJZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 20-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):
- 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 FAQ
1.How can I place an order for ISL8018IRAJZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8018IRAJZ 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 reliable?
The price and inventory of ISL8018IRAJZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8018IRAJZ is usually 5 days.
3.What payment methods are accepted for ISL8018IRAJZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8018IRAJZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8018IRAJZ?
ISL8018IRAJZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8018IRAJZ 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?
For technical support, including ISL8018IRAJZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8018IRAJZ requirements.
6.How does Aetrix verify that ISL8018IRAJZ is sourced from the original manufacturer or authorized distributors?
All ISL8018IRAJZ 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 meets industry standards.
7.What is the process for return or replacement of ISL8018IRAJZ?
All ISL8018IRAJZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL8018IRAJZ, 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 part is unused and in its original packaging.
Return procedure for ISL8018IRAJZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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