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Renesas ISL78235AARZ
- Part No.:
- ISL78235AARZ
- Manufacturer:
- Renesas
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL78235AARZ.pdf
- Description:
- IC REG BUCK ADJ 5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,468
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Product details
Overview
ISL78235AARZ from Renesas Electronics is a monolithic 5A automotive-grade synchronous buck regulator with peak current mode control, 2.7V–5.5V input range, 2MHz default switching frequency, and integrated 35mΩ P-channel / 11mΩ N-channel MOSFETs. It delivers stable 1.0–3.3V output for microcontroller, FPGA, and video SoC power in automotive infotainment systems.
For engineers reviewing the ISL78235AARZ datasheet, ISL78235AARZ pinout, ISL78235AARZ application, or ISL78235AARZ equivalent, key selection criteria include AEC-Q100 qualification, -40°C to +125°C operation in the 5mm×5mm WFQFN package, 100% duty cycle capability (<250mV dropout at 5A), and configurable PFM/PWM light-load operation.
Technical Context
The ISL78235AARZ employs peak current mode control with slope compensation to ensure loop stability across wide VIN/VOUT ratios and fast transient response. Its architecture supports seamless external synchronization (1–4MHz) and programmable frequency (500kHz–4MHz) via the FS pin resistor.
It integrates fault protection including hiccup-mode overcurrent limiting, output overvoltage detection (0.80V PG threshold), thermal shutdown at 150°C, and soft-stop output discharge via a 100Ω internal switch during disable. The 1ms power-good timer and 1% reference accuracy over temperature support robust automotive power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports direct connection to automotive 3.3V/5V rails without pre-regulation. |
| Output Current | 5A continuous - sufficient for high-performance SoCs and FPGAs in infotainment head units. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 2MHz - enables compact magnetics and EMI optimization. |
| HS/LS RDS(on) | 35mΩ / 11mΩ typical - minimizes conduction loss and improves full-load efficiency up to 95%. |
| Operating Temperature | -40°C to +125°C - rated for under-hood and dashboard-mounted automotive applications. |
| Reference Accuracy | ±1% over temperature - ensures tight output regulation across vehicle thermal extremes. |
| Power-Good Delay | 1ms fixed rising-edge delay - provides reliable system reset timing after startup. |
Pinout & Package
The ISL78235AARZ is packaged in a 16-lead 5mm×5mm Wettable Flank Quad Flat No-Lead (WFQFN) with exposed thermal pad, optimized for automotive thermal cycling reliability and solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input supply rail | Accepts 2.7–5.5V; requires dual 22µF low-ESR ceramic decoupling close to pins. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor high-side; internally discharged via 100Ω when disabled. |
| FB (Pin 9) | Feedback input | Senses output voltage via resistor divider; sets VOUT between 0.6V and rail minus losses. |
| EN (Pin 5) | Enable control | Logic-high active; initiates soft-start and disables soft-stop discharge when low. |
| PG (Pin 3) | Open-drain power-good | Asserts after 1ms once VOUT reaches 90–100% of target; requires external pull-up. |
| SYNC (Pin 4) | Mode/synchronization | Configures PFM (GND), PWM (VIN), or external sync (1–4MHz positive-edge trigger). |
| FS (Pin 6) | Frequency set | Resistor-to-GND programs fSW from 500kHz to 4MHz; tied to VIN for 2MHz default. |
| SS (Pin 7) | Soft-start timing | 1ms internal if grounded; capacitor-to-SGND extends ramp time for controlled inrush. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables <250mV dropout at 5A, critical for low-VIN automotive cold-crank scenarios. |
| AEC-Q100 qualified | Qualified to Grade 1 (-40°C to +125°C), meeting automotive reliability and stress-test requirements. |
| Internal soft-stop discharge | 100Ω switch actively discharges output capacitor on shutdown, preventing backfeed and latch-up. |
| 100ns minimum on-time | Supports wide VOUT regulation range (e.g., 1.0V from 5V input) at 2MHz switching. |
| Common pinout family | Pin-compatible with ISL78233 (3A) and ISL78234 (4A), enabling scalable design migration. |
Applications
| Automotive Infotainment Power | SoC/FPGA Core Supply |
|---|---|
|
Use Scenario: Powering display processors and audio DSPs in vehicle head units with wide input voltage transients. IC Role / Device Role / Timing Role: Primary POL buck regulator delivering 1.2V/1.8V/3.3V at up to 5A with AEC-Q100 compliance. Use Value: 125°C rating and hiccup-mode OCP ensure uninterrupted operation during engine cranking and thermal soak. |
Use Scenario: Providing tightly regulated core voltage to automotive-grade FPGAs and application SoCs. IC Role / Device Role / Timing Role: High-efficiency synchronous step-down converter with 1% reference accuracy and 1ms PG delay. Use Value: 100ns min-on-time and 2MHz switching enable small 0.68µH inductors and fast load transient response. |
| DC/DC POL Module | μC/μP Power Management |
|
Use Scenario: Integration into compact, thermally robust point-of-load modules for ADAS domain controllers. IC Role / Device Role / Timing Role: Monolithic buck IC with wettable flank QFN package for automated optical inspection and thermal reliability. Use Value: Exposed pad and θJA = 33°C/W enable high-power density without external heatsinks. |
Use Scenario: Supplying core and I/O rails to automotive microcontrollers in body control modules. IC Role / Device Role / Timing Role: Enable-controlled buck regulator with UVLO (2.7V), soft-start, and PG signaling for safe boot sequencing. Use Value: Internal 1ms soft-start and 1ms PG delay align precisely with MCU reset timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL78234AARZ | 4A max output current; identical pinout, package, and feature set except lower current rating. | Used where peak load current remains ≤4A; reduces thermal margin but maintains layout compatibility. | Select when system load profile confirms sustained current stays below 4A to simplify thermal design. |
| MPQ4433AGL-AEC1-Z | Monolithic 5A buck with 3.5–36V input; different pinout, no SYNC pin, and no wettable flank package. | Targeted at wider-input automotive systems (e.g., battery-supplied); not pin-compatible with ISL78235AARZ. | Choose only when input exceeds 5.5V or wettable flank inspection is not required; PCB redesign needed. |
Compared with ISL78234AARZ and MPQ4433AGL-AEC1-Z, the ISL78235AARZ uniquely combines 5A capability, AEC-Q100 Grade 1 rating, wettable flank WFQFN packaging, and seamless external synchronization - making it optimal for high-density, thermally constrained 5V/3.3V POL designs in modern infotainment ECUs.
Availability
ISL78235AARZ is available at Aetrix Electronics and suitable for automotive infotainment power, SoC/FPGA core supply, and DC/DC POL modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ISL78235AARZ 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 connectivity solutions for automotive, industrial, and IoT markets.
The ISL78235AARZ belongs to Renesas' automotive power management IC portfolio, designed specifically for high-reliability, high-efficiency point-of-load regulation in demanding vehicular environments.
FAQ
What is the maximum operating temperature for the ISL78235AARZ?
The ISL78235AARZ is rated for operation from -40°C to +125°C ambient temperature when packaged in the 5mm×5mm WFQFN variant (ISL78235AARZ). This Grade 1 AEC-Q100 qualification ensures suitability for under-dash and near-engine compartment applications where thermal extremes occur.
Does the ISL78235AARZ support external clock synchronization?
Yes, the ISL78235AARZ supports external synchronization via the SYNC pin, accepting a positive-edge-triggered clock signal from 1MHz to 4MHz. During sync operation, the device runs in forced PWM mode with seamless transition-no shutdown or reconfiguration is required.
What package type does the ISL78235AARZ use, and why is it significant?
The ISL78235AARZ uses a 16-lead 5mm×5mm Wettable Flank Quad Flat No-Lead (WFQFN) package. Its wettable flanks enable automated optical inspection (AOI) of solder joints-a critical requirement for automotive manufacturing quality assurance and field reliability.
How does the ISL78235AARZ handle short-circuit conditions?
The ISL78235AARZ implements hiccup-mode overcurrent protection: upon detecting a short, it shuts down, waits an auto-restart period (~8 soft-start cycles), then attempts recovery. This limits power dissipation and prevents thermal runaway while maintaining system-level fault containment.
Can the ISL78235AARZ operate with 100% duty cycle, and what is its practical benefit?
Yes, the ISL78235AARZ supports true 100% duty cycle operation, achieving less than 250mV dropout voltage at 5A output current. This is essential for automotive cold-crank scenarios where input voltage may dip to 2.7V while maintaining regulated output for safety-critical subsystems.
ISL78235AARZ 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:
- 5A
- Frequency - Switching:
- 420kHz ~ 4.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (5x5)
ISL78235AARZ FAQ
1.How can I place an order for ISL78235AARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78235AARZ 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 ISL78235AARZ reliable?
The price and inventory of ISL78235AARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78235AARZ is usually 5 days.
3.What payment methods are accepted for ISL78235AARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78235AARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78235AARZ?
ISL78235AARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78235AARZ 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 ISL78235AARZ?
For technical support, including ISL78235AARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78235AARZ requirements.
6.How does Aetrix verify that ISL78235AARZ is sourced from the original manufacturer or authorized distributors?
All ISL78235AARZ 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 ISL78235AARZ meets industry standards.
7.What is the process for return or replacement of ISL78235AARZ?
All ISL78235AARZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL78235AARZ, 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 ISL78235AARZ part is unused and in its original packaging.
Return procedure for ISL78235AARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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