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Renesas ISL8024AIRTAJZ
- Part No.:
- ISL8024AIRTAJZ
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL8024AIRTAJZ.pdf
- Description:
- IC REG BUCK ADJ 4A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,457
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Product details
Overview
ISL8024AIRTAJZ from Renesas (formerly Intersil) is a monolithic synchronous buck regulator delivering up to 4A continuous output current from a 2.7V–5.5V input, featuring integrated 45mΩ P-Channel and 19mΩ N-Channel MOSFETs, 1MHz default switching frequency, and 0.6V ±0.5% reference voltage. It supports 100% duty-cycle operation for ultra-low dropout (<200mV at 4A) and is used in FPGA, µP, and Li-ion battery-powered DC/DC point-of-load applications.
For engineers reviewing the ISL8024AIRTAJZ datasheet, ISL8024AIRTAJZ pinout, ISL8024AIRTAJZ application, or ISL8024AIRTAJZ equivalent, key selection considerations include its adjustable output configuration, internal/external compensation flexibility, hiccup-mode overcurrent protection, soft-stop output discharge, and compatibility with compact 3×3 QFN layouts requiring minimal external components.
Technical Context
The ISL8024AIRTAJZ employs current-mode PWM control with slope compensation (440mV/Ts) and a transconductance error amplifier (80µA/V internal, 150µA/V with external FS resistor), enabling fast transient response and stable loop behavior across 500kHz–4MHz adjustable frequency range. Its dual-mode operation-PWM (forced continuous) or PFM (discontinuous)-is selected via the SYNC pin, with zero-cross detection enabling skip-mode entry after eight consecutive inductor-current zero crossings.
Fault management includes hiccup-mode overcurrent protection triggered after 17 sequential cycles of >5.2A peak current, negative current limiting at –2.4A, thermal shutdown at +150°C with +25°C hysteresis, and power-good monitoring with 1ms delay and ±15% UV/OV window. The device also supports pre-biased start-up and soft-start ramp control via SS pin with internal 1ms timing or external capacitor adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion, USB, and intermediate bus rails without external LDO pre-regulation. |
| Output Current | Up to 4A continuous - enables direct powering of high-current digital loads like FPGAs and application processors. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 1MHz - balances efficiency, size, and EMI; allows use of sub-1µH inductors and low-ESR ceramic capacitors. |
| Reference Voltage | 0.600V ±0.5% over temp/load/line - ensures tight output regulation accuracy when using external resistor divider for adjustable VOUT. |
| Efficiency | Up to 95% - achieved via low RDS(on) integrated FETs (45mΩ HS / 19mΩ LS) and optimized gate drive, reducing thermal load in space-constrained designs. |
| Duty Cycle | 100% - maintains regulation down to VIN − (IOUT × 45mΩ); enables <200mV dropout at full 4A load for extended battery runtime. |
| Quiescent Current | 50µA in PFM no-load mode - minimizes standby power loss in portable and always-on systems. |
Pinout & Package
ISL8024AIRTAJZ is housed in a 16-lead 3mm × 3mm Pb-free TQFN package with exposed thermal pad (L16.3x3D), rated for –40°C to +85°C ambient operation and offering θJA = 45°C/W and θJC = 6.5°C/W for robust thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input power supply | Accepts 2.7–5.5V; requires two 22µF ceramic caps to PGND for high-frequency decoupling and stability. |
| PHASE (Pins 13–15) | Switching node | Connects directly to inductor; carries high di/dt square wave; layout critical for EMI and efficiency. |
| PGND (Pins 11, 12) | Power ground return | Low-impedance path for high-current switch return; must be separated from SGND and tied under exposed pad. |
| SGND (Pin 10) | Signal ground reference | Reference for FB, COMP, SS, EN, SYNC, FS, PG; connects to exposed pad for optimal noise immunity. |
| FB (Pin 8) | Feedback input | Senses output voltage via resistor divider; internal 0.6V reference sets VOUT = 0.6V × (1 + R2/R3); enables adjustable outputs from ~0.6V to VIN−losses. |
| COMP (Pin 9) | Error amplifier output | Used only with external FS resistor; otherwise disconnected internally; connect to SGND in default (FS-to-VIN) mode. |
| EN (Pin 5) | Enable control | Active-high logic input; internal 1MΩ pull-down ensures safe shutdown on float; initiates soft-start and soft-stop discharge. |
| PG (Pin 3) | Power-good indicator | Open-drain output with 1ms delay; pulled low during startup, fault, or undervoltage; requires external 10kΩ–100kΩ pull-up to VIN. |
| SYNC (Pin 4) | Mode selection/synchronization | Logic high = PWM mode; logic low = PFM/skip mode; external clock input up to 4MHz with positive-edge trigger. |
| FS (Pin 6) | Frequency set | Resistor-to-SGND sets fSW from 500kHz–4MHz; tied to VIN for default 1MHz and internal compensation. |
| SS (Pin 7) | Soft-start control | Tied to SGND for fixed 1ms ramp; capacitor to SGND adjusts ramp time (TSS ≈ Css × 625V/s); max 33nF recommended. |
| VDD (Pin 2) | Internal logic supply | Internally derived from VIN; no external connection required - tie to VIN only if needed for auxiliary bias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power FETs | 45mΩ P-Channel HS + 19mΩ N-Channel LS MOSFETs reduce BOM count and improve efficiency vs discrete solutions. |
| 100% Duty-Cycle Operation | Enables ultra-low dropout (<200mV @ 4A), extending usable battery voltage range in portable systems. |
| Programmable Switching Frequency | 500kHz–4MHz via single FS resistor - supports optimization for size (high-f), efficiency (mid-f), or EMI (low-f). |
| Pre-Biased Output Start-Up | Supports controlled ramp from non-zero VOUT, preventing reverse current and ensuring safe sequencing in multi-rail systems. |
| Hiccup-Mode Overcurrent Protection | 17-cycle fault counter followed by 8-soft-start-period recovery - limits thermal stress during sustained overload or short-circuit. |
| Soft-Stop Output Discharge | Internal 100Ω switch actively discharges VOUT to SGND during shutdown - prevents floating rail issues in downstream logic. |
Applications
| DC/DC POL Modules | µC/µP, FPGA and DSP Power |
|---|---|
Use Scenario: Compact, board-mounted DC/DC converters supplying regulated voltage to ASICs or SoCs in telecom line cards and industrial controllers. IC Role / Device Role / Timing Role: Primary step-down regulator providing tightly regulated, low-noise 1.2V/1.8V/3.3V rails with fast load-step response. Use Value: Integrated FETs and 1MHz operation enable <0.22 in² solution size; 95% efficiency reduces heat sink requirements in dense modules. | Use Scenario: Core and I/O power delivery for Xilinx Artix-7 FPGAs or ARM Cortex-A series microprocessors in embedded vision systems. IC Role / Device Role / Timing Role: High-current POL regulator supporting dynamic voltage scaling and rapid load transients up to 4A/µs. Use Value: Current-mode control and 100% duty cycle maintain regulation during brownout; soft-start prevents inrush into large core capacitance. |
| Portable Instruments | Li-ion Battery Powered Devices |
Use Scenario: Handheld multimeters, portable oscilloscopes, and field test equipment powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Main system regulator converting 3.0–4.2V battery voltage to stable 1.8V/3.3V for analog front-end and digital logic. Use Value: 50µA quiescent current in PFM mode extends battery life in sleep states; small 3×3 QFN footprint saves PCB area in handheld enclosures. | Use Scenario: Wearables, Bluetooth headsets, and medical sensors operating from 3.7V nominal Li-ion cells with strict size and thermal constraints. IC Role / Device Role / Timing Role: Efficient step-down converter delivering 1.2V core and 3.3V peripheral rails while maintaining >90% efficiency across 1mA–4A load range. Use Value: Adjustable frequency and PFM/PWM mode selection allow EMI tuning and efficiency optimization across varying load profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RTWR | 4A, 4.5–18V input, 500kHz–2MHz sync-capable; higher Vin range but larger 4×4 QFN package. | Targets higher-input industrial or automotive supplies; less suitable for single-cell Li-ion due to minimum 4.5V Vin. | Select when input exceeds 5.5V or higher thermal margin is needed; not drop-in for ISL8024AIRTAJZ's 2.7–5.5V domain. |
| MP2315DJ-LF-Z | 3A, 4.5–28V input, fixed 500kHz; smaller SOT-563 package but lower current and no PFM mode or soft-stop discharge. | Optimized for cost-sensitive, medium-power industrial sensors; lacks pre-bias start-up and hiccup recovery. | Choose for simpler, lower-cost 3A designs where 4A headroom and advanced protection are unnecessary. |
Compared with TPS544B20RTWR and MP2315DJ-LF-Z, ISL8024AIRTAJZ delivers superior low-input-voltage capability (2.7V min), integrated soft-stop discharge, and true PFM mode for ultra-low-Iq operation - making it uniquely suited for space-constrained, battery-powered systems requiring 4A output and robust fault handling.
Availability
ISL8024AIRTAJZ is available at Aetrix Electronics and suitable for DC/DC POL modules, µC/µP and FPGA power delivery, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8024AIRTAJZ 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 acquired Intersil in 2017 and continues to develop and support its high-performance analog and power management portfolio.
The ISL8024AIRTAJZ belongs to Renesas' ISL802x family of compact synchronous buck regulators, designed specifically for high-efficiency, low-profile point-of-load conversion in battery-powered and space-constrained embedded systems.
FAQ
What is the maximum output current capability of the ISL8024AIRTAJZ?
The ISL8024AIRTAJZ delivers up to 4A of continuous output current under recommended operating conditions (TA = –40°C to +85°C, VIN = 3.6V). Peak current limit is specified at 5.2–7.8A depending on test conditions, and thermal performance must be verified in the final layout using the 3×3 QFN's exposed pad for heatsinking.
Does the ISL8024AIRTAJZ support adjustable output voltage?
Yes, the ISL8024AIRTAJZ is an adjustable-output regulator. Output voltage is set via an external resistor divider connected to the FB pin, referenced to an internal 0.600V ±0.5% bandgap. Typical configurations achieve outputs from 0.6V up to near VIN, as shown in Table 1 of the FN7812 datasheet for 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V.
How does the ISL8024AIRTAJZ handle short-circuit conditions?
The ISL8024AIRTAJZ uses hiccup-mode overcurrent protection: upon detecting 17 consecutive overcurrent events (≥5.2A), it shuts down and attempts automatic recovery after eight soft-start periods. During fault, PG goes low and the output is discharged via the internal soft-stop switch - a behavior confirmed in Figures 30–31 and Section "Overcurrent Protection" of FN7812 Rev 3.00.
Can the ISL8024AIRTAJZ start up with a pre-biased output?
Yes, the ISL8024AIRTAJZ supports pre-biased output start-up. During soft-start initiation, the controller operates in SKIP mode and controls the high-side FET to prevent reverse current flow, allowing safe ramp-up from an existing VOUT voltage - a feature explicitly documented in the "Soft Start-Up" section (page 16) and Figure 23 of FN7812.
What package type and thermal characteristics does the ISL8024AIRTAJZ use?
The ISL8024AIRTAJZ uses a 16-lead 3mm × 3mm Pb-free TQFN package (L16.3x3D) with exposed thermal pad. Its thermal resistance is θJA = 45°C/W (free-air) and θJC = 6.5°C/W (junction-to-case), with maximum junction temperature rated at +125°C. Proper PCB layout - including multiple vias under the exposed pad tied to SGND - is essential to meet these specs.
ISL8024AIRTAJZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tray
- 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:
- 4A
- Frequency - Switching:
- 490kHz ~ 4.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
ISL8024AIRTAJZ FAQ
1.How can I place an order for ISL8024AIRTAJZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8024AIRTAJZ 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 ISL8024AIRTAJZ reliable?
The price and inventory of ISL8024AIRTAJZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8024AIRTAJZ is usually 5 days.
3.What payment methods are accepted for ISL8024AIRTAJZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8024AIRTAJZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8024AIRTAJZ?
ISL8024AIRTAJZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8024AIRTAJZ 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 ISL8024AIRTAJZ?
For technical support, including ISL8024AIRTAJZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8024AIRTAJZ requirements.
6.How does Aetrix verify that ISL8024AIRTAJZ is sourced from the original manufacturer or authorized distributors?
All ISL8024AIRTAJZ 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 ISL8024AIRTAJZ meets industry standards.
7.What is the process for return or replacement of ISL8024AIRTAJZ?
All ISL8024AIRTAJZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL8024AIRTAJZ, 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 ISL8024AIRTAJZ part is unused and in its original packaging.
Return procedure for ISL8024AIRTAJZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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