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Renesas ISL8024IRTAJZ-T
- Part No.:
- ISL8024IRTAJZ-T
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL8024IRTAJZ-T.pdf
- Description:
- IC REG BUCK ADJ 4A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,555
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Product details
Overview
ISL8024IRTAJZ-T 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 serves as a high-efficiency point-of-load (POL) power supply for FPGA, microcontroller, and DSP core rails in space-constrained portable and embedded systems.
For engineers reviewing the ISL8024IRTAJZ-T datasheet, ISL8024IRTAJZ-T pinout, ISL8024IRTAJZ-T application, or ISL8024IRTAJZ-T equivalent, key selection criteria include its 100% duty-cycle capability (<200mV dropout at 4A), hiccup-mode overcurrent protection, soft-stop output discharge, and adjustable 500kHz–4MHz switching frequency with external synchronization support.
Technical Context
The ISL8024IRTAJZ-T employs current-mode PWM control with slope compensation (440mV/Ts) and a transconductance error amplifier (80µA/V internal, 150µA/V with external FS resistor) for fast transient response and stable loop behavior across load and line variations. Its dual-mode operation-PWM (forced continuous) or PFM (discontinuous)-is selected via the SYNC pin, enabling noise-sensitive or efficiency-critical design trade-offs.
It integrates comprehensive protection: overtemperature shutdown (150°C trip, 125°C hysteresis), overvoltage (0.8V PG threshold), undervoltage (80–90% of nominal VOUT), negative current limiting (−2.4A), and cycle-by-cycle peak current limiting (5.2–7.8A depending on configuration), all implemented without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-current digital loads like FPGA I/O banks or CPU cores 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 industrial 3.3V/5V rails. |
| Reference Voltage | 0.600V ±0.5% - enables precise output regulation down to 0.8V using external resistor divider; ensures <±1.5% total output error over temp/load/line. |
| Switching Frequency | Adjustable 500kHz–4MHz (default 1MHz) - allows optimization of inductor size (e.g., 1µH at 1MHz) vs. efficiency vs. EMI profile. |
| Efficiency | Up to 95% at 1.8V/4A, 5V input - achieved via low RDS(on) FETs (45mΩ HS / 19mΩ LS) and minimal gate drive losses. |
| Duty Cycle | 100% - maintains regulation under ultra-low dropout conditions (e.g., <200mV at 4A), extending battery runtime in portable devices. |
| Power-Good Delay | 1ms after regulation - provides deterministic system reset timing and prevents premature processor boot before stable rail establishment. |
Pinout & Package
ISL8024IRTAJZ-T is housed in a 16-lead 3mm × 3mm Pb-free TQFN package with exposed thermal pad (L16.3x3D), optimized for low θJA (45°C/W) and minimal PCB footprint (<0.22 in²).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input power supply | Accepts 2.7–5.5V; requires dual 22µF ceramic capacitors to PGND for high-frequency decoupling and stability. |
| PHASE (Pins 13–15) | Switching node | Connects directly to inductor high-side terminal; 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 via multiple vias under exposed pad. |
| SGND (Pin 10) | Signal ground reference | Reference for FB, COMP, SS, EN, FS, SYNC, PG; must be star-connected to avoid noise coupling into feedback path. |
| FB (Pin 8) | Feedback input | Senses output voltage via resistor divider; internal 0.6V reference sets VOUT = 0.6V × (1 + R2/R3); supports pre-biased start-up. |
| COMP (Pin 9) | Error amplifier output | Internal compensation node; connect to SGND when FS = VIN; use external RC network only if FS resistor is applied. |
| EN (Pin 5) | Enable control | Active-high logic input; internal 1MΩ pull-down ensures safe shutdown at power-up; initiates soft-start and soft-stop discharge. |
| PG (Pin 3) | Power-good indicator | Open-drain output; pulled high via external 10kΩ–100kΩ resistor to VIN; asserts after 1ms delay when VOUT is within ±15% regulation. |
| FS (Pin 6) | Frequency select | Resistor-to-SGND sets fSW from 500kHz–4MHz; tie to VIN for default 1MHz and internal compensation. |
| SYNC (Pin 4) | Mode/synchronization | Logic-high = PWM mode; logic-low = PFM mode; external clock input up to 4MHz enables system-level timing coordination. |
| SS (Pin 7) | Soft-start control | Tie to SGND for fixed 1ms ramp; add capacitor (≤33nF) to SGND for adjustable rise time; prevents inrush current during startup. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power FETs | 45mΩ P-Channel HS + 19mΩ N-Channel LS MOSFETs - eliminate external switches, reduce BOM count to ≤3 external components (inductor + 2 caps). |
| 100% Duty-Cycle Operation | Enables <200mV dropout at 4A - sustains regulation during battery brownout or low-input scenarios without rail collapse. |
| Programmable Switching Frequency | 500kHz–4MHz via single FS resistor - balances inductor size, efficiency, and EMI filtering requirements across diverse applications. |
| Soft-Stop Output Discharge | Internal 100Ω switch discharges output capacitor during shutdown - prevents floating voltages and ensures clean power sequencing in multi-rail systems. |
| Hiccup-Mode Overcurrent Protection | 17-cycle fault detection followed by 8-soft-start-cycle recovery - protects against sustained short circuits while enabling automatic recovery without host intervention. |
| Pre-Biased Output Start-Up | Supports start-up into pre-charged output - essential for hot-swap, redundant power, and multi-phase POL applications where output may retain residual voltage. |
Applications
| DC/DC POL Modules | μC/µP, FPGA and DSP Power |
|---|---|
Use Scenario: Compact, self-contained DC/DC modules for telecom line cards and industrial PLCs requiring isolated or non-isolated 1.2V/1.8V/3.3V rails. IC Role / Device Role / Timing Role: Primary synchronous buck controller providing regulated core voltage with tight transient response and thermal robustness. Use Value: Enables full converter solution in <0.22 in² area using only one inductor and two 22µF ceramics - reduces module height to ≤1mm. |
Use Scenario: Core and I/O power delivery for Xilinx Artix-7 FPGAs and ARM Cortex-A series microprocessors in handheld test equipment. IC Role / Device Role / Timing Role: High-current POL regulator delivering 4A at 1.2V with <1.5% total output error and 1ms PG assertion for deterministic boot. Use Value: 95% peak efficiency extends battery life; 100% duty cycle maintains regulation down to 2.9V input - critical for Li-ion discharge curve. |
| Plug-in DC/DC Modules for Routers | Li-ion Battery Powered Devices |
Use Scenario: Hot-pluggable midplane power modules in enterprise routers requiring rapid enable/disable and fault containment. IC Role / Device Role / Timing Role: Standalone buck IC with EN-controlled sequencing, PG status reporting, and hiccup-mode OCP for plug-in safety compliance. Use Value: Soft-stop discharge eliminates backfeed risk during insertion/removal; PG signal synchronizes firmware initialization with rail stability. |
Use Scenario: Portable medical monitors and handheld spectrum analyzers powered by single-cell Li-ion batteries (3.0–4.2V). IC Role / Device Role / Timing Role: Main system regulator converting battery voltage to 3.3V/1.8V rails with ultra-low quiescent current (50µA in PFM). Use Value: PFM mode reduces light-load switching loss - extends standby time; 100% duty cycle delivers full 4A even at 2.9V battery voltage. |
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, 3.3V fixed or adjustable; uses external MOSFETs; higher Vin range but larger solution size. | Targets higher-input industrial systems (12V rails); not suitable for direct Li-ion (3.0–4.2V) interface without pre-regulation. | Select when input exceeds 5.5V or when external FET control/tuning is required; avoid for space-constrained 5V-input designs. |
| MP2315DJ-LF-Z | 3A, 4.5–28V input, integrated FETs; lower current rating, no soft-stop discharge, no pre-biased start-up support. | Cost-optimized for non-critical consumer applications; lacks PG timing accuracy and hiccup-mode recovery for mission-critical systems. | Choose for cost-sensitive 3A applications with Vin > 4.5V; reject for 4A loads, battery brownout resilience, or strict power sequencing. |
Compared with TPS544B20RTWR and MP2315DJ-LF-Z, the ISL8024IRTAJZ-T uniquely combines 4A capability, 2.7V minimum input, 100% duty cycle, soft-stop discharge, and pre-biased start-up in a 3×3mm QFN - making it optimal for compact, battery-powered, and high-reliability POL designs.
Availability
ISL8024IRTAJZ-T is available at Aetrix Electronics and suitable for DC/DC POL modules, μC/FPGA power delivery, and Li-ion battery-powered devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ISL8024IRTAJZ-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 acquired Intersil in 2017 and continues to manufacture and support its high-performance analog and power management portfolio.
The ISL8024IRTAJZ-T belongs to Renesas' ISL802x family of monolithic synchronous buck regulators, designed specifically for high-efficiency, low-noise, space-constrained point-of-load power in portable instrumentation, communications infrastructure, and embedded computing.
FAQ
What is the maximum continuous output current of the ISL8024IRTAJZ-T?
The ISL8024IRTAJZ-T delivers up to 4A of continuous output current across the full operating temperature range (−40°C to +85°C) when properly heatsinked via its exposed thermal pad and using recommended PCB layout practices per the datasheet. Derating applies above +85°C ambient, with thermal shutdown activating at +125°C junction temperature.
Does the ISL8024IRTAJZ-T support pre-biased output start-up?
Yes, the ISL8024IRTAJZ-T supports pre-biased output start-up. During soft-start initiation, the device operates in SKIP mode and regulates based on feedback voltage rather than forcing current into an already charged output capacitor - preventing reverse current flow and ensuring safe turn-on in hot-swap or multi-rail systems where the output may retain residual voltage before enable.
How is the switching frequency set on the ISL8024IRTAJZ-T?
The switching frequency of the ISL8024IRTAJZ-T is set via the FS pin: connecting FS to VIN configures the default 1MHz frequency with internal compensation; connecting a resistor from FS to SGND adjusts frequency from 500kHz to 4MHz using RFS = 220kΩ / (fOSC − 14kHz). External synchronization up to 4MHz is also supported via the SYNC pin.
What protection features are integrated into the ISL8024IRTAJZ-T?
The ISL8024IRTAJZ-T integrates overcurrent (hiccup-mode), overtemperature (150°C shutdown with 25°C hysteresis), overvoltage (0.8V PG threshold), undervoltage (80–90% of nominal VOUT), and negative current (−2.4A limit) protection. All functions operate autonomously without external components, ensuring robust fault handling in unattended or safety-critical systems.
Can the ISL8024IRTAJZ-T operate with a 2.7V input supply?
Yes, the ISL8024IRTAJZ-T is fully specified to operate from 2.7V to 5.5V input. At 2.7V input, it maintains 4A output capability with appropriate derating and layout; its 100% duty-cycle feature ensures regulation even as input drops near the output voltage, making it ideal for single-cell Li-ion applications where voltage ranges from 4.2V down to 2.7V.
ISL8024IRTAJZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-WFQFN 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:
- 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)
ISL8024IRTAJZ-T FAQ
1.How can I place an order for ISL8024IRTAJZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8024IRTAJZ-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 ISL8024IRTAJZ-T reliable?
The price and inventory of ISL8024IRTAJZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8024IRTAJZ-T is usually 5 days.
3.What payment methods are accepted for ISL8024IRTAJZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8024IRTAJZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8024IRTAJZ-T?
ISL8024IRTAJZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8024IRTAJZ-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 ISL8024IRTAJZ-T?
For technical support, including ISL8024IRTAJZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8024IRTAJZ-T requirements.
6.How does Aetrix verify that ISL8024IRTAJZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8024IRTAJZ-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 ISL8024IRTAJZ-T meets industry standards.
7.What is the process for return or replacement of ISL8024IRTAJZ-T?
All ISL8024IRTAJZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8024IRTAJZ-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 ISL8024IRTAJZ-T part is unused and in its original packaging.
Return procedure for ISL8024IRTAJZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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