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Renesas ISL8024AIRTAJZ-T
- Part No.:
- ISL8024AIRTAJZ-T
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL8024AIRTAJZ-T.pdf
- Description:
- IC REG BUCK ADJ 4A 16TQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ISL8024AIRTAJZ-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 ±0.8% reference accuracy. It supports 100% duty-cycle operation for <200mV dropout at 4A and is used in FPGA, µP, and Li-ion-powered portable instrumentation power rails.
For engineers reviewing the ISL8024AIRTAJZ-T datasheet, ISL8024AIRTAJZ-T pinout, ISL8024AIRTAJZ-T application, or ISL8024AIRTAJZ-T equivalent, key selection considerations include its adjustable-frequency PWM/PSM control, internal soft-start with pre-bias support, hiccup-mode overcurrent protection, and thermal shutdown at 150°C - all in a space-constrained 3×3 mm QFN package.
Technical Context
The ISL8024AIRTAJZ-T employs current-mode PWM control with slope compensation (440mV/Ts) and transconductance error amplification (80µA/V typical), enabling fast transient response and stable loop behavior across 500kHz–4MHz operation. Its dual-mode operation-forced PWM for low-noise applications or PFM for light-load efficiency-relies on SYNC pin logic level selection and zero-cross detection.
It integrates full fault protection: overcurrent (5.2–7.8A peak limit), negative current (-1.8 to -3.0A), overvoltage, undervoltage, and thermal shutdown (150°C trip, 125°C hysteresis). Power-good monitoring uses a 1ms delay window and ±15% VFB window with open-drain PG output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - enables single-chip POL supply for high-current FPGAs and microprocessors without external MOSFETs. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V), USB 5V, and industrial 3.3V/5V rails. |
| Reference Voltage Accuracy | 0.6V ±0.8% over temp/load/line - ensures tight output regulation (e.g., ±12mV on 1.5V rail) without trimming. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 1MHz - allows optimization of inductor size (e.g., 1µH @ 1MHz) vs. EMI trade-offs. |
| FET On-Resistance | P-FET: 45mΩ typ @ 5V; N-FET: 19mΩ typ @ 5V - minimizes conduction loss, supporting >95% peak efficiency at 3.3VOUT/2A. |
| Thermal Resistance | θJA = 45°C/W, θJC = 6.5°C/W - requires exposed pad soldered to SGND plane for reliable 4A operation at +85°C ambient. |
| Soft-Start Time | 1ms internal (SS tied to SGND) - limits inrush current during power-up; adjustable via external capacitor up to 33nF. |
Pinout & Package
ISL8024AIRTAJZ-T is housed in a 16-lead 3×3 mm Pb-free TQFN package with exposed thermal pad (L16.3x3D), requiring connection to signal ground for electrical integrity and optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input power supply | Accepts 2.7–5.5V; requires two 22µF ceramic capacitors to PGND for stability and ripple suppression. |
| PHASE (Pins 13–15) | Switching node | Connects directly to inductor; carries high di/dt square wave - must minimize trace inductance and avoid routing near sensitive analog nodes. |
| PGND (Pins 11, 12) | Power ground return | Low-impedance path for high pulsed currents; separate from SGND to prevent noise coupling into feedback circuitry. |
| SGND (Pin 10) | Signal ground reference | Reference for FB, COMP, SS, EN, FS, SYNC, PG; must be star-connected to exposed pad and isolated from PGND except at single point. |
| FB (Pin 8) | Feedback voltage sense | Monitors output via resistor divider; internal 0.6V reference sets VOUT = 0.6V × (1 + R2/R3); bias current <0.01µA minimizes divider error. |
| COMP (Pin 9) | Error amplifier output | Used only with external compensation (FS resistor); otherwise disconnected - tie to SGND in internal-compensation mode. |
| EN (Pin 5) | Enable control | Active-high logic input; internal 1MΩ pull-down ensures safe shutdown at power-up; drives soft-stop discharge when low. |
| PG (Pin 3) | Power-good indicator | Open-drain output with 1ms delay after regulation; pulled low during faults or soft-start - requires external 10k–100kΩ pull-up to VIN. |
| FS (Pin 6) | Frequency select | Resistor-to-SGND sets fSW; 0Ω (to VIN) configures 1MHz default with internal compensation; supports synchronization up to 4MHz. |
| SYNC (Pin 4) | Mode control / sync input | High = forced PWM; low = PFM/skip mode; external clock edge-triggered - enables EMI reduction or system-level timing alignment. |
| SS (Pin 7) | Soft-start timing | Internal 1ms ramp when tied to SGND; capacitor to SGND extends ramp time linearly (TSS ≈ CSS × 1.6µA); max 33nF recommended. |
| VDD (Pin 2) | Logic supply | Internally regulated from VIN; connect directly to VIN - no external decoupling required. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables ultra-low dropout (<200mV at 4A) during battery brownout, extending runtime in Li-ion systems without output collapse. |
| Pre-biased output start-up | Supports hot-swap and sequencing-critical systems by safely ramping output from non-zero initial voltage without reverse current flow. |
| Hiccup-mode overcurrent protection | Shuts down for 8 soft-start cycles upon 17 consecutive OC faults - prevents thermal runaway while allowing automatic recovery if fault clears. |
| Integrated soft-stop discharge | Activates internal 100Ω switch to safely discharge output capacitor during shutdown - eliminates residual voltage hazards in multi-rail systems. |
| Adjustable PFM/PWM transition | SYNC pin selects fixed-frequency PWM (low noise) or adaptive PFM (high light-load efficiency), with zero-cross detection enabling seamless mode switching. |
Applications
| DC/DC POL Modules | µP/FPGA Core Power |
|---|---|
Use Scenario: Compact, board-mounted point-of-load converter supplying 1.2V/3A to an ARM-based SoC in a network edge device. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated core voltage with fast load-step response. Use Value: Integrated 45mΩ/19mΩ FETs and 1MHz operation enable <0.22 in² solution size and <10µs output recovery from 2A step load. |
Use Scenario: Powering Xilinx Artix-7 FPGA banks requiring 1.0V ±3% and 4A peak current in a portable test instrument. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured for 1.0V via external resistor divider and internal 0.6V reference. Use Value: 0.8% reference accuracy and ±15% PG window ensure reliable FPGA configuration and deterministic power-good assertion. |
| Li-ion Battery-Powered Devices | Portable Instruments |
Use Scenario: Single-cell Li-ion (2.7–4.2V) powered handheld oscilloscope requiring 3.3V/2A analog supply with minimal quiescent current. IC Role / Device Role / Timing Role: High-efficiency buck converter operating in PFM mode at light loads to extend battery life. Use Value: 50µA quiescent current in PFM and 100% duty cycle allow >30 minutes runtime at 10mA load when battery drops below 3.0V. |
Use Scenario: Multi-channel data acquisition module with isolated ADCs, requiring clean, low-noise 5V and 3.3V rails from shared 5V input. IC Role / Device Role / Timing Role: Dual-rail POL regulator using ISL8024AIRTAJZ-T for 3.3V and companion ISL8023 for 5V generation. Use Value: Synchronization capability (via SYNC pin) enables interleaved switching to reduce input capacitor RMS current and conducted EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54340DDAR | 4.5–36V input range; 3.5A output; external MOSFETs required; no integrated P-FET; 100% duty cycle not supported. | Better suited for industrial 12V/24V inputs; unsuitable for Li-ion direct feed due to higher VIN min. | Select when input exceeds 5.5V or when discrete FET control is preferred; not drop-in for ISL8024AIRTAJZ-T's 2.7–5.5V domain. |
| MP2345DJ-LF-Z | 2.5–5.5V input; 4A output; integrated FETs; 500kHz–3MHz adjustable frequency; 0.6V reference; no PFM mode or pre-bias start-up. | Lacks skip-mode efficiency optimization and pre-biased start-up - may cause output overshoot in hot-plug scenarios. | Valid alternative for fixed-frequency PWM-only designs where light-load efficiency is secondary; verify soft-start behavior in system context. |
Compared with TPS54340DDAR and MP2345DJ-LF-Z, the ISL8024AIRTAJZ-T uniquely combines Li-ion-compatible input range, integrated high-efficiency FETs, PFM/PWM dual-mode operation, and robust pre-biased start-up - making it optimal for space-constrained, battery-powered embedded systems demanding both efficiency and reliability.
Availability
ISL8024AIRTAJZ-T is available at Aetrix Electronics and suitable for DC/DC POL modules, µP/FPGA power delivery, and Li-ion battery-powered portable instrumentation requiring stable component supply and long-term production continuity.
Supply support for ISL8024AIRTAJZ-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 acquired Intersil in 2017 and maintains full technical and manufacturing support for the ISL802x family. Renesas is a global semiconductor leader focused on embedded processing, analog, power, and connectivity solutions.
The ISL8024AIRTAJZ-T belongs to Renesas' high-efficiency monolithic buck regulator product line, designed specifically for space- and power-constrained portable and battery-operated applications requiring minimal external components and robust protection features.
FAQ
What is the maximum continuous output current of the ISL8024AIRTAJZ-T?
The ISL8024AIRTAJZ-T delivers up to 4A of continuous output current under recommended operating conditions (TA ≤ +85°C, proper PCB layout with thermal vias to SGND). Peak current capability reaches 7.8A before hiccup-mode overcurrent protection activates, but sustained operation above 4A requires derating based on thermal performance and ambient conditions.
Does the ISL8024AIRTAJZ-T support pre-biased output start-up?
Yes, the ISL8024AIRTAJZ-T supports pre-biased output start-up. During soft-start, it operates in SKIP mode and actively prevents reverse current flow, allowing safe ramp-up from a non-zero initial output voltage - critical for hot-swap and multi-rail sequencing applications where downstream circuitry may retain charge.
How is the switching frequency set on the ISL8024AIRTAJZ-T?
The ISL8024AIRTAJZ-T switching frequency is set via the FS pin: connecting FS to VIN configures the default 1MHz operation with internal compensation; connecting FS to SGND through a resistor (RFS) adjusts frequency from 500kHz to 4MHz per RFS = 220kΩ / (fOSC – 14kHz). External clock synchronization is also supported via the SYNC pin.
What protection features does the ISL8024AIRTAJZ-T include?
The ISL8024AIRTAJZ-T integrates hiccup-mode overcurrent protection (17-cycle fault detection), thermal shutdown (150°C trip, 25°C hysteresis), overvoltage and undervoltage lockout, negative current limiting (–1.8 to –3.0A), and soft-stop output discharge. All protections are fully internal - no external components required for basic fault coverage.
Can the ISL8024AIRTAJZ-T operate with a 2.7V input and 1.8V output at 4A?
Yes, the ISL8024AIRTAJZ-T supports 2.7V–5.5V input and adjustable output down to 0.6V. At 2.7VIN/1.8VOUT/4A, it achieves ~90% efficiency (per Figure 6 in FN7812) and maintains regulation via 100% duty-cycle operation when input approaches dropout - verified in typical operating performance data across load and input ranges.
ISL8024AIRTAJZ-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)
ISL8024AIRTAJZ-T FAQ
1.How can I place an order for ISL8024AIRTAJZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL8024AIRTAJZ-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 ISL8024AIRTAJZ-T reliable?
The price and inventory of ISL8024AIRTAJZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL8024AIRTAJZ-T is usually 5 days.
3.What payment methods are accepted for ISL8024AIRTAJZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL8024AIRTAJZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL8024AIRTAJZ-T?
ISL8024AIRTAJZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL8024AIRTAJZ-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 ISL8024AIRTAJZ-T?
For technical support, including ISL8024AIRTAJZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL8024AIRTAJZ-T requirements.
6.How does Aetrix verify that ISL8024AIRTAJZ-T is sourced from the original manufacturer or authorized distributors?
All ISL8024AIRTAJZ-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 ISL8024AIRTAJZ-T meets industry standards.
7.What is the process for return or replacement of ISL8024AIRTAJZ-T?
All ISL8024AIRTAJZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL8024AIRTAJZ-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 ISL8024AIRTAJZ-T part is unused and in its original packaging.
Return procedure for ISL8024AIRTAJZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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