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Renesas ISL78234AARZ-T7A
- Part No.:
- ISL78234AARZ-T7A
- Manufacturer:
- Renesas
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL78234AARZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 4A 16WFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:154
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Product details
Overview
ISL78234AARZ-T7A from Renesas Electronics is a 4A monolithic synchronous buck regulator optimized for automotive infotainment and processor power delivery. It operates from 2.7V–5.5V input, delivers up to 4A continuous output current, integrates 35mΩ P-channel and 11mΩ N-channel MOSFETs, supports adjustable 500kHz–4MHz switching frequency (default 2MHz), and features AEC-Q100 qualification for -40°C to +125°C operation.
For engineers reviewing the ISL78234AARZ-T7A datasheet, ISL78234AARZ-T7A pinout, ISL78234AARZ-T7A application, or ISL78234AARZ-T7A equivalent, key selection criteria include its 100% duty-cycle capability (<200mV dropout at 4A), hiccup-mode overcurrent protection, internal/external compensation flexibility, soft-stop output discharge, and shared pinout with ISL78233 for scalable power design.
Technical Context
The ISL78234AARZ-T7A uses current-mode PWM control with slope compensation (440mV/Ts) and pulse-by-pulse current limiting for fast transient response and loop stability. Its integrated high-side P-FET and low-side N-FET enable high efficiency-up to 95% at 2MHz-with minimal external components.
It supports dual operating modes: forced continuous conduction mode (reducing EMI) and discontinuous conduction mode (improving light-load efficiency). The device includes comprehensive fault protection: hiccup-mode overcurrent, overvoltage, overtemperature, negative current detection, and UVLO with 2.7V rising threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous - supports high-power SoC, FPGA, and video processor rails without external FETs. |
| Input Voltage Range | 2.7V to 5.5V - compatible with automotive 3.3V/5V domains and single-cell Li-ion systems. |
| Switching Frequency | 500kHz–4MHz, default 2MHz - enables compact magnetics and noise-sensitive layout optimization. |
| FET ON-Resistance | P-FET: 35mΩ typ, N-FET: 11mΩ typ at 5V VIN - minimizes conduction loss and thermal rise at full load. |
| Reference Accuracy | ±1% over temperature/load/line - ensures stable output regulation across automotive operating conditions. |
| Power-Good Delay | 1ms fixed timer - provides deterministic system sequencing for μC/FPGA boot timing. |
| Quiescent Current | 45µA in PFM no-load - extends battery runtime in always-on automotive modules. |
Pinout & Package
ISL78234AARZ-T7A is housed in a 5mm×5mm 16-lead Wettable Flank Quad Flat No-Lead (WFQFN) package with exposed thermal pad, rated for -40°C to +125°C junction temperature and qualified per AEC-Q100.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,16) | Input power supply | Accepts 2.7V–5.5V; requires ≥2×22µF ceramic decoupling directly to PGND. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor; internally discharged via 100Ω resistor during shutdown. |
| PGND (Pins 11,12) | Power ground return | Separate low-impedance path for high di/dt currents; must be tied to SGND at single point. |
| SGND (Pin 10) | Signal ground reference | Reference for FB, COMP, SS, EN; exposed pad must connect to SGND for thermal/electrical integrity. |
| FB (Pin 9) | Feedback input | Monitors output voltage via resistor divider; sets VOUT = 0.6V × (1 + R2/R3). |
| COMP (Pin 8) | Error amplifier output | Supports internal compensation (tie to VDD) or external network for loop tuning flexibility. |
| EN (Pin 5) | Enable control | Active-high logic; pulls output capacitor to GND via internal soft-stop switch when disabled. |
| FS (Pin 6) | Frequency select | Resistor-to-SGND sets fSW from 500kHz–4MHz; tie to VIN for default 2MHz. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables <200mV dropout at 4A, supporting ultra-low-VIN applications like post-regulation from LDOs or battery sag scenarios. |
| Soft-stop output discharge | Internally discharges VOUT capacitor on disable-eliminates need for external bleed circuitry in safety-critical systems. |
| AEC-Q100 qualification | Validated for automotive temperature range (-40°C to +125°C) and reliability stress tests, enabling use in infotainment and ADAS subsystems. |
| Shared pinout with ISL78233 | Allows seamless upgrade from 3A to 4A output power without PCB redesign-reduces BOM and validation effort. |
| External synchronization support | SYNC pin accepts external clock up to 4MHz, enabling noise-sensitive timing alignment in multi-rail systems. |
Applications
| Automotive Infotainment Power | μC/FPGA Core Supply |
|---|---|
Use Scenario: Powering head-unit SoCs and display controllers in vehicles with wide input voltage transients. IC Role / Device Role / Timing Role: Primary POL buck converter delivering stable 1.2V/1.8V/3.3V rails with fast load-step response. Use Value: AEC-Q100 rating and hiccup-mode OCP ensure robustness against cold-crank and load-dump events. | Use Scenario: Supplying core voltage to automotive-grade microcontrollers and programmable logic devices. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with precise 1% reference accuracy for digital logic stability. Use Value: 2MHz default switching enables small 1.0µH inductors and tight layout, reducing board area by >30% vs lower-frequency alternatives. |
| Video Processor SoC Power | Li-ion Battery-Powered Devices |
Use Scenario: Delivering clean, regulated power to high-performance vision processors in ADAS cameras. IC Role / Device Role / Timing Role: Synchronous buck with low-noise PFM/PWM mode selection and soft-start control. Use Value: Discontinuous mode reduces quiescent current to 45µA, extending runtime in always-on camera modules. | Use Scenario: Power management in portable diagnostic tools and telematics units powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Input-voltage-flexible buck regulator supporting full battery range (2.7V–4.5V). Use Value: 100% duty-cycle operation maintains regulation down to 2.9V input at full 4A load-critical for end-of-discharge operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL78234ARZ-T7A | Same electrical specs but in 3mm×3mm TQFN package; higher θJA (43°C/W vs 33°C/W). | Better suited for space-constrained designs where thermal budget allows; less thermal margin than WFQFN variant. | Select ISL78234ARZ-T7A only if board area is critical and ambient temperature remains ≤85°C. |
| MPQ4433AGL-AEC1-Z | 4A buck with 3.8V–60V input, different pinout, no soft-stop discharge, 1.2MHz fixed frequency. | Targets higher-input automotive systems (e.g., 12V/24V bus); lacks 100% duty cycle and AEC-Q100 shared-pinout scalability. | Choose MPQ4433AGL-AEC1-Z only for 12V-battery-fed applications requiring wider VIN range-not a drop-in replacement. |
Compared with ISL78234ARZ-T7A, the ISL78234AARZ-T7A offers superior thermal performance (θJA = 33°C/W) and wettable flank leads for automated optical inspection, while MPQ4433AGL-AEC1-Z trades input voltage flexibility for reduced feature parity in low-VIN, high-precision POL use cases.
Availability
ISL78234AARZ-T7A is available at Aetrix Electronics and suitable for automotive infotainment power, μC/FPGA core supply, and Li-ion battery-powered devices requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for ISL78234AARZ-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 specializing in microcontrollers, analog, power management, and automotive ICs, with deep expertise in functional safety and AEC-Q100-compliant solutions.
The ISL78234AARZ-T7A belongs to Renesas' ISL7823x family of compact synchronous buck regulators, designed specifically for automotive battery-powered applications demanding high efficiency, small footprint, and robust fault protection across extended temperature ranges.
FAQ
What is the maximum continuous output current supported by the ISL78234AARZ-T7A?
The ISL78234AARZ-T7A supports 4A of continuous output current across its full operating temperature range (-40°C to +125°C). This rating is validated under recommended thermal conditions using the 5mm×5mm WFQFN package with proper PCB copper pour and vias to SGND. Peak current limit is 6.7A typical at +25°C, with hiccup-mode protection engaging above that threshold.
Does the ISL78234AARZ-T7A support 100% duty-cycle operation, and what is its practical benefit?
Yes, the ISL78234AARZ-T7A supports true 100% duty-cycle operation, enabling output regulation even when input voltage drops close to the output level. At 4A load, it achieves <200mV dropout voltage-critical for maintaining SoC functionality during automotive cold-crank events or Li-ion battery sag. This eliminates the need for pre-regulation stages in many designs.
How does the soft-stop function work on the ISL78234AARZ-T7A, and why is it important?
When the EN pin is pulled low, the ISL78234AARZ-T7A activates an internal soft-stop switch that actively discharges the output capacitor through a controlled path. This prevents floating or uncontrolled VOUT decay, ensuring safe, predictable power-down behavior required in automotive safety-critical systems and avoiding latch-up in downstream logic.
Can the ISL78234AARZ-T7A be synchronized to an external clock, and what is the maximum frequency?
Yes, the SYNC pin accepts an external clock signal for synchronization. The ISL78234AARZ-T7A supports external synchronization up to 4MHz, matching its maximum adjustable internal switching frequency. This capability enables EMI reduction through frequency dithering or precise timing alignment in multi-rail power systems-essential for noise-sensitive ADAS and infotainment applications.
What package type and thermal characteristics define the ISL78234AARZ-T7A?
The ISL78234AARZ-T7A uses a 5mm×5mm 16-lead Wettable Flank Quad Flat No-Lead (WFQFN) package with exposed thermal pad. Its thermal resistance is θJA = 33°C/W and θJC = 3.5°C/W, significantly lower than the 3mm×3mm TQFN variant (θJA = 43°C/W). This enables higher power density and improved reliability in thermally constrained automotive environments.
ISL78234AARZ-T7A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-VQFN 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:
- 420kHz ~ 4.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WFQFN (5x5)
ISL78234AARZ-T7A FAQ
1.How can I place an order for ISL78234AARZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78234AARZ-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 ISL78234AARZ-T7A reliable?
The price and inventory of ISL78234AARZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78234AARZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL78234AARZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78234AARZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78234AARZ-T7A?
ISL78234AARZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78234AARZ-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 ISL78234AARZ-T7A?
For technical support, including ISL78234AARZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78234AARZ-T7A requirements.
6.How does Aetrix verify that ISL78234AARZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL78234AARZ-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 ISL78234AARZ-T7A meets industry standards.
7.What is the process for return or replacement of ISL78234AARZ-T7A?
All ISL78234AARZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL78234AARZ-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 ISL78234AARZ-T7A part is unused and in its original packaging.
Return procedure for ISL78234AARZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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