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Renesas ISL78233AARZ-T
- Part No.:
- ISL78233AARZ-T
- Manufacturer:
- Renesas
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL78233AARZ-T.pdf
- Description:
- IC REG BUCK ADJ 3A 16WFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,234
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Product details
Overview
ISL78233AARZ-T from Renesas Electronics is a monolithic synchronous buck regulator delivering up to 3A continuous output current from a 2.7V–5.5V input, featuring integrated 35mΩ P-channel and 11mΩ N-channel MOSFETs, adjustable 500kHz–4MHz switching frequency (default 2MHz), and AEC-Q100 qualification for automotive power delivery in microcontroller and SoC applications.
For engineers reviewing the ISL78233AARZ-T datasheet, ISL78233AARZ-T pinout, ISL78233AARZ-T application, or ISL78233AARZ-T equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world design implications for Li-ion battery-powered infotainment systems and DC/DC POL modules requiring high efficiency and 100% duty-cycle operation.
Technical Context
The ISL78233AARZ-T uses current-mode PWM control with slope compensation (440mV/Ts) and pulse-by-pulse current limiting, enabling fast transient response and stable loop behavior across load and line variations. Its dual-MOSFET architecture supports forced continuous conduction mode (reducing EMI) or discontinuous mode (improving light-load efficiency).
It integrates fault protection including hiccup-mode overcurrent limiting, thermal shutdown at 150°C with 25°C hysteresis, overvoltage and undervoltage monitoring via FB, and soft-stop output discharge during disable. The 1ms power-good delay and internal/external compensation options support robust system-level power sequencing and stability tuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - sufficient for powering single-core μC, FPGA I/O banks, or video processor cores without external current boosting. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V), USB PD (5V), and automotive 5V rails after pre-regulation. |
| Switching Frequency | Adjustable 500kHz–4MHz (default 2MHz) - enables optimization of inductor size vs. efficiency; 2MHz allows <1µH inductors and compact PCB layout. |
| FET RDS(on) | P-ch 35mΩ / N-ch 11mΩ (typ @ 5V VIN) - minimizes conduction loss, supporting >95% peak efficiency at 1.8V/3A output. |
| Reference Accuracy | ±1% over -40°C to +125°C - ensures tight output regulation for sensitive digital loads without external trimming. |
| Thermal Rating | -40°C to +125°C junction temperature, AEC-Q100 qualified - validated for under-hood automotive environments and industrial edge controllers. |
| Package | 5mm × 5mm 16-lead Wettable Flank QFN (WFQFN) - exposes thermal pad to SGND for low θJA = 33°C/W and reliable reflow inspection. |
Pinout & Package
ISL78233AARZ-T is housed in a 5mm × 5mm 16-lead Wettable Flank Quad Flat No-Lead (WFQFN) package with exposed thermal pad connected to SGND. The pinout is identical to the ISL78233ARZ family and shares common footprint with ISL78234 variants for scalable power upgrades.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1,16) | Main input supply rail | Accepts 2.7–5.5V; requires ≥2×22µF ceramic decoupling close to pins to suppress high di/dt noise. |
| PHASE (Pins 13–15) | Switching node | Connects directly to inductor; internally discharged via 100Ω resistor during shutdown to prevent output voltage hold-up. |
| FB (Pin 9) | Feedback input | Senses output voltage via external resistor divider; reference is 0.600V ±1%, enabling adjustable VOUT from ~0.6V to near VIN. |
| EN (Pin 5) | Enable control | Active-high logic input (VIH = 0.9V min); pulls output to 0V and discharges capacitor when low. |
| PG (Pin 3) | Power-good indicator | Open-drain output with 1ms delay after regulation; requires external 10kΩ–100kΩ pull-up to VIN for system sequencing. |
| FS (Pin 6) | Frequency select | Resistor-to-SGND sets fSW; tied to VIN for default 2MHz - critical for EMI compliance and inductor selection. |
| SS (Pin 7) | Soft-start timing | Capacitor-to-SGND adjusts ramp time; shorted to SGND yields fixed 1ms startup - prevents inrush current in battery-fed systems. |
| COMP (Pin 8) | Error amplifier output | Supports internal compensation (tie to VDD) or external network (R/C to SGND) for custom loop stability in noisy environments. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty-cycle operation | Enables <200mV dropout at 3A - essential for maintaining regulation during cold-crank automotive transients down to 2.7V input. |
| Internal soft-stop discharge | Actively sinks output capacitor charge during disable - eliminates need for external bleed resistors in safety-critical automotive subsystems. |
| Adjustable light-load mode | Selectable PFM/PWM via SYNC pin - reduces quiescent current to 45µA in PFM while retaining fast wake-up for intermittent processing loads. |
| AEC-Q100 Grade 1 qualification | Validated for -40°C to +125°C operation with full electrical test coverage - meets automotive functional safety requirements without derating. |
| Shared pinout with ISL78234 | Enables hardware-compatible upgrade path from 3A to 4A output by swapping IC and adjusting inductor/current-sense components only. |
Applications
| Automotive Infotainment Power | μC/FPGA Core Supply |
|---|---|
Use Scenario: Powering ARM-based SoCs and display controllers in head units with wide input voltage range and strict EMI limits. IC Role / Device Role / Timing Role: Primary 1.2V/1.8V POL regulator with 2MHz switching and SYNC-controlled PFM mode for dynamic power states. Use Value: AEC-Q100 qualification and 100% duty cycle ensure uninterrupted operation during 4.5V cold-crank events; wettable flank package enables automated optical inspection. |
Use Scenario: Delivering clean, tightly regulated core voltage to microcontrollers and FPGA fabric in industrial gateways. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter with internal soft-start and PG signal for safe boot sequencing. Use Value: ±1% reference accuracy maintains timing margin for high-speed interfaces; 35mΩ/11mΩ FETs reduce thermal load on compact PCBs. |
| Li-ion Battery-Powered Devices | Video Processor DC/DC Module |
Use Scenario: Step-down conversion from single-cell Li-ion (2.7–4.2V) to 3.3V I/O or 1.5V memory rails in portable medical or test equipment. IC Role / Device Role / Timing Role: Input-voltage adaptive buck regulator with ultra-low 45µA quiescent current in PFM mode. Use Value: Extends battery runtime by minimizing no-load losses; 5mm×5mm WFQFN fits space-constrained handheld enclosures. |
Use Scenario: Compact, high-current power stage for image signal processors in automotive ADAS cameras. IC Role / Device Role / Timing Role: 3A capable POL module with fast transient response (<10µs recovery) and hiccup-mode OCP for fault containment. Use Value: Integrated 35mΩ/11mΩ MOSFETs eliminate discrete driver losses; PG signal synchronizes camera sensor initialization with stable VOUT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL78233ARZ-T | Same silicon, but in 3mm×3mm TQFN package (θJA = 43°C/W vs. 33°C/W); no wettable flanks. | Better suited for space-constrained designs where thermal performance is secondary to footprint size. | Select ISL78233ARZ-T when board area is critical and ambient temperature remains below 85°C. |
| MPQ4433AGL-AEC1-Z | Monolithic 3A buck with 3.8V–36V input, lower max fSW (2.2MHz), no wettable flank package, different pinout. | Targeted at higher-input automotive systems (e.g., 12V battery rail), not optimized for 5V/Li-ion inputs. | Choose MPQ4433AGL-AEC1-Z only when input exceeds 5.5V; not drop-in compatible due to pinout and control interface differences. |
Compared with ISL78233AARZ-T, the ISL78233ARZ-T offers identical electrical performance in a smaller footprint but reduced thermal capability, while the MPQ4433AGL-AEC1-Z supports wider input ranges at the cost of layout redesign and loss of wettable flank inspection benefits.
Availability
ISL78233AARZ-T 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 ISL78233AARZ-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 is a global semiconductor leader specializing in microcontrollers, analog power management, and automotive SoCs, with deep expertise in high-reliability automotive-grade ICs.
The ISL78233AARZ-T belongs to Renesas' ISL7823x automotive buck regulator family, designed specifically for demanding power delivery in infotainment, ADAS, and body electronics where AEC-Q100 qualification, thermal robustness, and small-footprint high-efficiency conversion are mandatory.
FAQ
What is the maximum continuous output current of the ISL78233AARZ-T?
The ISL78233AARZ-T delivers up to 3A continuous output current across its full operating temperature range (-40°C to +125°C). This rating is validated under typical conditions with proper PCB thermal design using the 5mm×5mm WFQFN package and adequate copper area connected to the exposed thermal pad. Peak current capability reaches 6A before hiccup-mode overcurrent protection activates.
Does the ISL78233AARZ-T support adjustable output voltage?
Yes, the ISL78233AARZ-T supports fully adjustable output voltage via an external resistor divider connected to the FB pin. With a 0.600V ±1% internal reference, VOUT can be set from approximately 0.6V up to near the input voltage (accounting for conduction losses). Common configurations include 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V, as detailed in Table 1 of the FN8359 datasheet.
How does the ISL78233AARZ-T handle thermal overload?
The ISL78233AARZ-T incorporates thermal shutdown protection that triggers at +150°C junction temperature and remains latched until the die cools by at least 25°C (hysteresis). During overtemperature events, the device disables switching, discharges the output capacitor via the soft-stop circuit, and asserts PG low. Recovery occurs automatically once temperature falls below +125°C, ensuring fail-safe behavior in enclosed automotive environments.
Can the ISL78233AARZ-T operate with 100% duty cycle?
Yes, the ISL78233AARZ-T supports true 100% duty-cycle operation, allowing the output voltage to track closely to the input voltage minus small conduction losses. At 3A load, dropout is less than 200mV - critical for maintaining regulation during automotive cold-crank conditions where input may dip to 2.7V while powering a 2.5V rail.
What is the purpose of the wettable flank feature in the ISL78233AARZ-T package?
The wettable flank structure on the ISL78233AARZ-T's WFQFN package exposes solderable sidewalls on all four edges, enabling automated optical inspection (AOI) of solder joint quality during reflow. This is required for automotive manufacturing process validation and improves long-term reliability by verifying complete solder fillet formation - a key requirement for AEC-Q200-compliant assembly lines.
ISL78233AARZ-T 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:
- 3A
- 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)
ISL78233AARZ-T FAQ
1.How can I place an order for ISL78233AARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78233AARZ-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 ISL78233AARZ-T reliable?
The price and inventory of ISL78233AARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78233AARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78233AARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78233AARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78233AARZ-T?
ISL78233AARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78233AARZ-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 ISL78233AARZ-T?
For technical support, including ISL78233AARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78233AARZ-T requirements.
6.How does Aetrix verify that ISL78233AARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78233AARZ-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 ISL78233AARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78233AARZ-T?
All ISL78233AARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78233AARZ-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 ISL78233AARZ-T part is unused and in its original packaging.
Return procedure for ISL78233AARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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