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Renesas ISL78233AARZ
- Part No.:
- ISL78233AARZ
- Manufacturer:
- Renesas
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL78233AARZ.pdf
- Description:
- IC REG BUCK ADJ 3A 16WFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,074
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Product details
Overview
ISL78233AARZ from Renesas Electronics is a monolithic synchronous buck DC/DC regulator delivering 3A continuous output current from a 2.7V–5.5V input, featuring integrated 35mΩ P-channel and 11mΩ N-channel MOSFETs, 2MHz default switching frequency, and AEC-Q100 qualification for automotive infotainment power rails.
For engineers reviewing the ISL78233AARZ datasheet, ISL78233AARZ pinout, ISL78233AARZ application, or ISL78233AARZ equivalent, key selection considerations include its 5×5mm WFQFN wettable flank package, 1ms power-good delay, hiccup-mode overcurrent protection, soft-stop output discharge, and adjustable 500kHz–4MHz frequency tuning via the FS pin.
Technical Context
The ISL78233AARZ employs 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 100% duty-cycle operation for <200mV dropout at full load.
It integrates internal soft-start (1ms fixed), programmable frequency, external synchronization capability up to 4MHz, and configurable light-load operation-either forced continuous conduction mode (reducing EMI) or discontinuous conduction mode (improving light-load efficiency).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3A continuous - sufficient for powering microcontrollers, FPGAs, and video SoCs in space-constrained automotive modules. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion, 3.3V/5V rails, and automotive battery transients. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 2MHz - enables compact magnetics and noise filtering while supporting EMI-sensitive domains. |
| FET RDS(on) | P-ch 35mΩ / N-ch 11mΩ (typ @ 5V) - minimizes conduction loss and improves peak efficiency to 95%. |
| Reference Accuracy | ±1.2% over temp/load/line - ensures tight output regulation for voltage-sensitive digital cores. |
| Operating Temp | −40°C to +125°C junction - validated for under-hood and infotainment module deployment. |
| Protection Features | Hiccup OCP, OVP, UVP, thermal shutdown, negative current limit - provides robust fault recovery without external circuitry. |
Pinout & Package
ISL78233AARZ is housed in a 16-lead 5mm×5mm Wettable Flank Quad Flat No-Lead (WFQFN) package with exposed thermal pad connected to SGND. The pinout matches the ISL78233/ISL78234 family for layout reuse across 3A/4A variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input supply rail | Accepts 2.7–5.5V; requires ≥2×22µF ceramic decoupling close to pins for stability. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor; internally discharged via 100Ω resistor during shutdown to prevent shoot-through. |
| FB (Pin 9) | Feedback sense | Monitors output via resistor divider; sets VOUT = 0.6V × (1 + R2/R3); used by PG and UVLO circuits. |
| EN (Pin 5) | Enable control | Active-high logic; pulls output capacitor to ground via internal soft-stop switch when low. |
| PG (Pin 3) | Power-good indicator | Open-drain output with 1ms delay after regulation; requires external 10kΩ–100kΩ pull-up to VIN. |
| FS (Pin 6) | Frequency select | Resistor-to-ground sets fSW; tied to VIN for 2MHz default; supports sync input up to 4MHz. |
| SS (Pin 7) | Soft-start timing | Grounded for 1ms ramp; capacitor to SGND extends soft-start time (≤33nF recommended). |
| COMP (Pin 8) | Error amplifier output | Used for external compensation network; connect to VIN for internal compensation only. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 35mΩ high-side P-MOSFET + 11mΩ low-side N-MOSFET - eliminates external FETs and gate drivers, reducing BOM count to ≤3 external components. |
| 100% Duty-Cycle Operation | Enables <200mV dropout at 3A - critical for maintaining regulation during cold-crank or low-VIN conditions in automotive systems. |
| AEC-Q100 Qualified | Rated for −40°C to +125°C operation with full automotive reliability testing - suitable for safety-critical infotainment and ADAS subsystems. |
| Wettable Flank Package | 5×5mm WFQFN with solderable side walls - enables automated optical inspection (AOI) of solder joints for high-yield automotive PCB assembly. |
| Configurable Light-Load Mode | Selectable PFM (high efficiency) or forced PWM (low noise) - allows optimization for battery life vs. EMI compliance per system requirement. |
Applications
| Automotive Infotainment Power | μC/FPGA Core Supply |
|---|---|
Use Scenario: Powering head-unit SoCs and display controllers in vehicles with wide battery voltage range and strict thermal constraints. IC Role / Device Role / Timing Role: Primary POL buck regulator delivering stable 1.2V–3.3V at up to 3A with fast load-step response. Use Value: AEC-Q100 rating and 125°C operation ensure reliability in dashboard environments; 2MHz switching enables small 1µH inductors and low-profile layouts. | Use Scenario: Providing tightly regulated core voltage to ARM-based microcontrollers or Xilinx Artix-7 FPGAs in industrial edge nodes. IC Role / Device Role / Timing Role: High-efficiency step-down converter with precise 0.6V reference and ±1.2% accuracy over temperature. Use Value: Internal soft-start prevents inrush current damage; PG signal synchronizes firmware boot sequence with power rail stabilization. |
| Li-ion Powered Video Processors | DC/DC POL Module Integration |
Use Scenario: Supplying 1.8V/3A to mobile video processors in portable diagnostic tools or telematics gateways. IC Role / Device Role / Timing Role: Synchronous buck regulator with ultra-low quiescent current (45µA) and soft-stop discharge for battery preservation. Use Value: Discontinuous mode extends runtime at light loads; hiccup OCP protects against shorted outputs during field service. | Use Scenario: Embedded in compact, thermally optimized DC/DC modules for space-limited embedded computing platforms. IC Role / Device Role / Timing Role: Monolithic buck IC with wettable flank QFN package enabling AOI-capable, high-density module assembly. Use Value: Shared pinout with ISL78234 allows future-proof design upgrades to 4A without PCB revision; exposed pad enhances thermal dissipation. |
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 | 3×3mm TQFN package; higher θJA (43°C/W) vs. ISL78233AARZ's 33°C/W; identical electrical specs. | Better suited for lower-power or thermally relaxed layouts where footprint is prioritized over thermal performance. | Select ISL78233ARZ when board area is constrained and thermal margin exceeds 15°C; choose ISL78233AARZ for higher ambient or sustained 3A loads. |
| MPQ4433AGL-AEC1-Z | Monolithic 3A buck; 3.8–36V input; 2.2MHz fixed frequency; different pinout and control interface (no FS/SS pins). | Targeted at wider-input automotive systems (e.g., engine control); lacks adjustable frequency and soft-start flexibility. | Use MPQ4433AGL-AEC1-Z only when input exceeds 5.5V; ISL78233AARZ remains optimal for 2.7–5.5V battery-powered domains. |
Compared with ISL78233ARZ and MPQ4433AGL-AEC1-Z, the ISL78233AARZ delivers superior thermal performance in a wettable flank package, retains full configurability (frequency, soft-start, light-load mode), and maintains pin compatibility within its own family-making it the preferred choice for high-reliability, thermally demanding 3A POL designs.
Availability
ISL78233AARZ is available at Aetrix Electronics and suitable for automotive infotainment power, μC/FPGA core supply, and Li-ion powered video processor applications requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for ISL78233AARZ 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, and automotive SoCs, with deep expertise in high-reliability power management solutions.
The ISL78233AARZ belongs to Renesas' ISL7823x automotive-grade synchronous buck regulator product line, engineered specifically for demanding 12V battery-derived power rails in infotainment, ADAS, and body electronics where efficiency, thermal resilience, and AEC-Q100 validation are mandatory.
FAQ
What is the maximum continuous output current supported by the ISL78233AARZ?
The ISL78233AARZ supports 3A of continuous output current across its full operating temperature range (−40°C to +125°C). This rating is confirmed in the datasheet's Recommended Operating Conditions table and validated under worst-case thermal conditions using the 5×5mm WFQFN package's 33°C/W θJA. Peak current capability reaches 6A before hiccup-mode overcurrent protection activates.
Does the ISL78233AARZ require external compensation components?
The ISL78233AARZ supports both internal and external compensation. When COMP is tied to VIN, internal compensation is enabled and no external RC network is needed. For improved loop stability across varying loads or output capacitors, external compensation (R4/C4/C5) is recommended - as explicitly stated in the Typical Application Diagram on page 3 of FN8359 Rev.11.01.
How does the ISL78233AARZ handle output capacitor discharge during shutdown?
During shutdown (EN = low), the ISL78233AARZ actively discharges the output capacitor through an internal soft-stop switch connected between PHASE and PGND. This prevents residual voltage from interfering with downstream logic sequencing and meets automotive reset timing requirements. The discharge path is distinct from the main power stage and operates independently of the high-side or low-side FETs.
What is the purpose of the FS pin on the ISL78233AARZ, and how is it configured?
The FS pin on the ISL78233AARZ sets the switching frequency via an external resistor to SGND, enabling adjustment from 500kHz to 4MHz. Connecting FS directly to VIN configures the default 2MHz operation. The datasheet specifies exact resistor values: 42.2kΩ yields ~4.2MHz, and 402kΩ yields ~420kHz. This pin also accepts external clock signals for synchronization, supporting deterministic EMI reduction in multi-rail systems.
Is the ISL78233AARZ pin-compatible with other devices in the ISL7823x family?
Yes, the ISL78233AARZ shares identical pinout and footprint with ISL78234AARZ (4A version) and all ISL7823x variants in the 5×5mm WFQFN package. This common pin configuration allows direct hardware scalability - upgrading from 3A to 4A output requires only a bill-of-materials change, not a PCB redesign - as confirmed in the datasheet's "Shared common device pinout" feature bullet and Pin Configuration diagram.
ISL78233AARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ISL78233AARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78233AARZ 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 reliable?
The price and inventory of ISL78233AARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78233AARZ is usually 5 days.
3.What payment methods are accepted for ISL78233AARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78233AARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78233AARZ?
ISL78233AARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78233AARZ 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?
For technical support, including ISL78233AARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78233AARZ requirements.
6.How does Aetrix verify that ISL78233AARZ is sourced from the original manufacturer or authorized distributors?
All ISL78233AARZ 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 meets industry standards.
7.What is the process for return or replacement of ISL78233AARZ?
All ISL78233AARZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL78233AARZ, 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 part is unused and in its original packaging.
Return procedure for ISL78233AARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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