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Renesas ISL78235AARZ-T
- Part No.:
- ISL78235AARZ-T
- Manufacturer:
- Renesas
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
ISL78235AARZ-T.pdf
- Description:
- IC REG BUCK ADJ 5A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,070
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Product details
Overview
ISL78235AARZ-T from Renesas Electronics is a monolithic 5A automotive-grade synchronous buck regulator with 2.7V–5.5V input, 100% duty cycle capability (≤250mV dropout at 5A), peak current mode control, and adjustable 500kHz–4MHz switching frequency. It integrates 35mΩ P-channel high-side and 11mΩ N-channel low-side MOSFETs and delivers power to μC/FPGA/SOC rails in infotainment systems.
For engineers reviewing the ISL78235AARZ-T datasheet, ISL78235AARZ-T pinout, ISL78235AARZ-T application, or ISL78235AARZ-T equivalent, key selection criteria include AEC-Q100 qualification, -40°C to +125°C operation in the 5mm×5mm WFQFN package, hiccup-mode OCP, soft-stop output discharge, and pin compatibility with ISL78233/ISL78234 for scalable POL designs.
Technical Context
The ISL78235AARZ-T employs peak current mode control with slope compensation for stable operation across wide duty cycles and fast transient response. Its architecture supports seamless external synchronization (1MHz–4MHz) and configurable PFM/PWM light-load modes via the SYNC pin.
It features integrated protection including hiccup-mode overcurrent, output overvoltage, input UVLO, and thermal shutdown at 150°C with 25°C hysteresis. The 1ms PG timer, internal/external soft-start, and 100Ω soft-stop switch enable controlled power sequencing and safe disable behavior.
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 powering high-performance SoCs, FPGAs, and video processors. |
| Switching Frequency | Adjustable 500kHz–4MHz - enables optimization of size (higher fSW → smaller L/C) vs. efficiency (lower fSW → lower switching loss). |
| High-Side RDS(on) | 35mΩ typical at VIN = 5V - reduces conduction loss and improves full-load efficiency up to 95%. |
| Low-Side RDS(on) | 11mΩ typical at VIN = 5V - minimizes bottom-FET loss during synchronous rectification phase. |
| Reference Accuracy | ±1% over temperature - ensures tight output voltage regulation critical for sensitive digital loads. |
| Operating Temperature | -40°C to +125°C - rated for under-hood automotive environments using the 5mm×5mm WFQFN package. |
Pinout & Package
The ISL78235AARZ-T is packaged in a 16-lead Wettable Flank Quad Flat No-Lead (WFQFN) measuring 5mm × 5mm with exposed thermal pad, optimized for high-power density and automated optical solder-joint inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input power supply | Accepts 2.7V–5.5V input; requires dual 22µF low-ESR ceramic decoupling close to pins. |
| VDD (Pin 2) | Logic supply rail | Internally connected to VIN; powers internal circuitry; requires 0.1µF HF decoupling to SGND. |
| PG (Pin 3) | Open-drain power-good indicator | Signals valid regulation after 1ms delay; requires external 10kΩ–100kΩ pull-up to VIN. |
| SYNC (Pin 4) | Mode/synchronization control | Selects PFM (GND), PWM (VIN), or external sync (1–4MHz); internal 1MΩ pull-down prevents floating. |
| EN (Pin 5) | Enable/disable control | Active-high logic input; forces shutdown and activates 100Ω soft-stop discharge path on PHASE. |
| FS (Pin 6) | Frequency set resistor node | Resistor to GND programs fSW from 500kHz to 4MHz; default 2MHz when tied to VIN. |
| SS (Pin 7) | Soft-start timing control | 1ms internal ramp when grounded; capacitor to SGND extends soft-start time (≤33nF). |
| COMP (Pin 8) | Error amplifier output | Connect to VDD for internal compensation; otherwise use external RC network for loop stability tuning. |
| FB (Pin 9) | Feedback input | Senses output voltage via resistor divider; sets VOUT = 0.6V × (1 + R1/R2); used by PG and UVLO circuits. |
| SGND (Pin 10) | Signal ground reference | Must be connected to PGND plane; serves as reference for FB, COMP, SS, EN, FS, SYNC, PG. |
| PGND (Pins 11, 12) | Power ground return | Low-impedance return path for high-current switching; must be tied directly to SGND at single point. |
| PHASE (Pins 13–15) | Switching node | Connects to inductor; driven by HS/LS FETs; internally discharged via 100Ω resistor during shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables <250mV dropout at 5A, supporting ultra-low-VIN applications like post-buck LDO replacement. |
| 100ns minimum on-time | Permits stable regulation down to ~0.6V output at 2MHz, enabling high-ratio step-down for core SoC rails. |
| Internal soft-stop discharge | 100Ω switch actively discharges output capacitor during disable, preventing backfeed and ensuring safe sequencing. |
| AEC-Q100 Grade 1 qualification | Validated for automotive applications requiring -40°C to +125°C operation and robust ESD/latch-up immunity. |
| Common pinout family | Pin-compatible with ISL78233 (3A) and ISL78234 (4A), enabling scalable PCB reuse across power levels. |
Applications
| DC/DC POL Modules | μC/FPGA Power Delivery |
|---|---|
|
Use Scenario: Compact, high-efficiency point-of-load conversion in space-constrained automotive ECUs. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering regulated 1.2V/1.8V/3.3V to microcontrollers and programmable logic. Use Value: 95% peak efficiency and 5A capability reduce thermal load and eliminate need for external heatsinking in sealed modules. |
Use Scenario: Powering ARM-based application processors and Xilinx/Intel FPGA cores in infotainment head units. IC Role / Device Role / Timing Role: Main DC/DC regulator with fast transient response and precise ±1% VREF for digital supply rails. Use Value: 100ns min-on-time and 2MHz default fSW support tight regulation of sub-1V core voltages with minimal output capacitance. |
| Video Processor/SOC Power | Automotive Infotainment Power |
|
Use Scenario: Supplying high-current, low-noise power to image signal processors and multimedia SoCs. IC Role / Device Role / Timing Role: High-current buck stage with selectable PFM/PWM mode to balance efficiency and EMI in mixed-signal domains. Use Value: Forced PWM mode eliminates frequency variation during light loads, reducing RF interference near sensitive analog video paths. |
Use Scenario: Central power management for touchscreens, audio amplifiers, and connectivity modules in dashboard systems. IC Role / Device Role / Timing Role: AEC-Q100 qualified buck regulator operating across -40°C to +125°C ambient with hiccup-mode fault recovery. Use Value: Integrated OTP, OVP, OCP, and UVLO protections ensure fail-safe operation in unattended vehicle environments. |
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-T | 4A max output current; identical pinout, package, and feature set except reduced current rating. | Suitable where system load peaks below 4.5A; lower thermal stress but insufficient for 5A FPGA burst loads. | Select when marginally lower current suffices and cost reduction is prioritized without layout change. |
| MPQ4433AGL-AEC1-Z | Monolithic 5A buck with 3.8V–60V input range; different pinout; no internal soft-stop discharge; AEC-Q100 qualified. | Targets higher-input automotive systems (e.g., 12V/24V battery rails); not drop-in compatible due to pin mismatch and wider VIN. | Choose only when input exceeds 5.5V; requires new layout, compensation, and sequencing design. |
Compared with ISL78235AARZ-T, ISL78234AARZ-T offers identical integration and footprint at lower current capacity, while MPQ4433AGL-AEC1-Z trades pin compatibility for extended input range-neither is pin-to-pin replaceable, but both serve adjacent automotive buck requirements.
Availability
ISL78235AARZ-T is available at Aetrix Electronics and suitable for automotive infotainment power, μC/FPGA power delivery, and video processor/SOC power applications requiring stable component supply across extended temperature ranges and AEC-Q100 compliance.
Supply support for ISL78235AARZ-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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.
The ISL78235AARZ-T belongs to Renesas' automotive power management portfolio, designed specifically for high-reliability, high-efficiency point-of-load conversion in demanding under-hood and cabin environments.
FAQ
What is the maximum junction temperature and thermal shutdown threshold for the ISL78235AARZ-T?
The ISL78235AARZ-T has an operating junction temperature range of -55°C to +125°C and triggers thermal shutdown at +150°C with 25°C hysteresis. This ensures reliable operation in automotive under-hood environments while protecting against sustained overtemperature conditions. The 5mm×5mm WFQFN package provides θJA = 33°C/W for effective heat dissipation.
Does the ISL78235AARZ-T support external synchronization, and what is the valid frequency range?
Yes, the ISL78235AARZ-T supports external synchronization via the SYNC pin with a positive-edge-triggered input ranging from 1MHz to 4MHz. During synchronization, the device operates in forced PWM mode, and transitions between internal oscillator and external clock are seamless-no shutdown or reconfiguration is required. This enables EMI reduction through frequency dithering or alignment with system clocks.
How does the soft-stop function work on the ISL78235AARZ-T during shutdown?
When the ISL78235AARZ-T is disabled via the EN pin, its internal 100Ω soft-stop switch connects the PHASE node to SGND, actively discharging the output capacitor. This prevents backfeed into upstream supplies and ensures controlled, monotonic VOUT decay-critical for safe power sequencing in multi-rail systems. The discharge rate depends on output capacitance and load conditions.
What is the purpose of the FS pin on the ISL78235AARZ-T, and how is switching frequency set?
The FS pin on the ISL78235AARZ-T sets the internal oscillator frequency using a resistor to GND. With RFS = 402kΩ, fSW = 420kHz; with RFS = 42.2kΩ, fSW = 4.2MHz. Connecting FS to VIN configures the default 2MHz operation. This programmability allows designers to optimize trade-offs between inductor size, efficiency, and EMI performance for each application.
Is the ISL78235AARZ-T pin-compatible with other devices in the ISL7823x family?
Yes, the ISL78235AARZ-T shares identical pinout and package dimensions with ISL78233AARZ-T (3A) and ISL78234AARZ-T (4A), enabling direct migration across current ratings without PCB redesign. This common footprint simplifies platform scaling and reduces validation effort when upgrading power capability in automotive infotainment or ADAS modules.
ISL78235AARZ-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:
- 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-T FAQ
1.How can I place an order for ISL78235AARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78235AARZ-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 ISL78235AARZ-T reliable?
The price and inventory of ISL78235AARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78235AARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78235AARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78235AARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78235AARZ-T?
ISL78235AARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78235AARZ-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 ISL78235AARZ-T?
For technical support, including ISL78235AARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78235AARZ-T requirements.
6.How does Aetrix verify that ISL78235AARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78235AARZ-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 ISL78235AARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78235AARZ-T?
All ISL78235AARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78235AARZ-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 ISL78235AARZ-T part is unused and in its original packaging.
Return procedure for ISL78235AARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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