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Renesas ISL78235ARZ
- Part No.:
- ISL78235ARZ
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL78235ARZ.pdf
- Description:
- IC REG BUCK ADJ 5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,351
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Product details
Overview
ISL78235ARZ from Renesas Electronics is a monolithic synchronous buck regulator delivering 5A continuous output current from 2.7V–5.5V input, featuring peak current mode control, 2MHz default switching frequency, 35mΩ/11mΩ integrated high-side/low-side MOSFETs, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the ISL78235ARZ datasheet, ISL78235ARZ pinout, ISL78235ARZ application, or ISL78235ARZ equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal and protection specs, and real-world design guidance for FPGA, SoC, and infotainment power delivery.
Technical Context
The ISL78235ARZ employs peak current mode control with 100ns minimum on-time capability, enabling stable regulation down to sub-1V outputs at high VIN-to-VOUT ratios. Its internal 35mΩ P-channel HS and 11mΩ N-channel LS FETs support up to 95% efficiency and 100% duty cycle operation for <250mV dropout at 5A.
It supports dual operating modes-forced PWM (low-noise) via SYNC high or PFM (light-load efficiency) via SYNC low-and integrates hiccup-mode OCP, OTP, OVP, UVLO, soft-start (1ms fixed or adjustable), and soft-stop output discharge via internal 100Ω switch during shutdown.
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 and battery-supervised systems. |
| Output Current | 5A continuous - sufficient for powering high-performance μP, FPGA, or video SoC cores without external boost stages. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 2MHz - enables compact magnetics and EMI optimization in space-constrained automotive modules. |
| HS/LS RDS(on) | 35mΩ / 11mΩ (typ.) - minimizes conduction loss and thermal rise at full load, supporting >95% peak efficiency. |
| Reference Accuracy | ±1% over temperature - ensures tight output voltage regulation across -40°C to +105°C ambient range. |
| Protection Features | Hiccup OCP, OTP (150°C), OVP (0.80V PG threshold), UVLO (2.7V rising), soft-stop discharge - enables robust fault recovery in safety-critical domains. |
| Package | 3mm×3mm 16-lead TQFN (RoHS, Pb-free) - thermally enhanced with exposed pad tied to SGND; rated for -40°C to +105°C. |
Pinout & Package
ISL78235ARZ is housed in a 3mm×3mm, 16-lead Thin Quad Flat No-lead (TQFN) package with exposed thermal pad (EPAD), optimized for automotive PCB layouts requiring high power density and thermal reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 1, 16) | Input power supply rail | Accepts 2.7V–5.5V; requires ≥2×22µF ceramic decoupling close to pins for stability under transient load. |
| PHASE (Pins 13–15) | Switching node | Connects directly to inductor; internally discharged via 100Ω resistor during disable to prevent floating output. |
| PGND (Pins 11, 12) | Power ground return | Low-impedance path for high di/dt currents; must be separated from SGND except at single-point tie. |
| SGND (Pin 10) | Signal ground reference | Reference for FB, COMP, EN, SS, FS; connects to PGND at single point near EPAD for noise isolation. |
| FB (Pin 9) | Feedback input | Monitors output via resistor divider; sets VOUT = 0.6V × (1 + R1/R2); also used for PG and UVLO detection. |
| EN (Pin 5) | Enable control | Active-high logic input; device shuts down and discharges output when pulled low. |
| PG (Pin 3) | Power-good open-drain output | Asserts after 1ms delay once VOUT reaches regulation; requires external 10kΩ–100kΩ pull-up to VIN. |
| SYNC (Pin 4) | Mode selection/synchronization | High = forced PWM; low = PFM; external clock = synchronized PWM; internal 1MΩ pull-down prevents floating. |
| FS (Pin 6) | Frequency set | Resistor-to-GND sets fSW from 500kHz–4MHz; tied to VIN for default 2MHz operation. |
| SS (Pin 7) | Soft-start timing | Tied to SGND for fixed 1ms ramp; capacitor to SGND adjusts ramp time (≤33nF recommended). |
| COMP (Pin 8) | Error amplifier output | Internal compensation if tied to VDD; external RC network required otherwise for loop stability. |
| VDD (Pin 2) | Logic supply | Internally regulated from VIN; requires 0.1µF ceramic cap to SGND; must connect to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Peak current mode control | Enables fast transient response and stable loop behavior across wide VIN/VOUT ratios and load steps. |
| 100% duty cycle operation | Supports ultra-low dropout (<250mV at 5A), critical for post-regulation in low-headroom automotive systems. |
| Configurable light-load mode | PFM improves efficiency at light loads; forced PWM reduces EMI-selected via SYNC pin without reconfiguration. |
| Integrated soft-stop discharge | 100Ω internal switch safely discharges output capacitor during shutdown, preventing backfeed or latch-up. |
| AEC-Q100 qualified | Rated for automotive temperature range (-40°C to +105°C) and stress-tested per AEC-Q100 Rev G standards. |
| Common pinout family | Pin-compatible with ISL78233 (3A) and ISL78234 (4A), enabling scalable power design without PCB revision. |
Applications
| DC/DC POL Module | μC/FPGA Core Power |
|---|---|
|
Use Scenario: Point-of-load conversion in compact automotive ADAS domain controllers where board space and thermal management are constrained. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated 1.2V/1.8V/3.3V to processor cores. Use Value: 5A capability, 2MHz switching, and 95% efficiency minimize heatsink size and enable single-layer thermal design. |
Use Scenario: Powering ARM-based microcontrollers and Xilinx/Zynq FPGAs in infotainment head units with dynamic load profiles. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with fast transient response to handle burst-mode CPU activity. Use Value: 100ns minimum on-time and peak current mode control ensure stable regulation during 0A→5A load steps. |
| Video Processor SoC Supply | Automotive Infotainment Power |
|
Use Scenario: Providing clean, low-noise 1.0V–1.2V rails to image signal processors (ISP) and display controllers in rear-seat entertainment systems. IC Role / Device Role / Timing Role: Synchronous buck converter with selectable PFM/PWM mode to balance efficiency and EMI during video streaming. Use Value: Forced PWM mode suppresses switching noise in sensitive analog video paths; PFM extends battery runtime in standby. |
Use Scenario: Main 5V-to-1.8V/2.5V conversion for touchscreen controllers, audio codecs, and CAN interface ICs in dashboard clusters. IC Role / Device Role / Timing Role: Automotive-qualified DC/DC regulator with integrated protections for unregulated 12V battery-derived inputs. Use Value: Hiccup OCP, OTP, and UVLO ensure safe operation during cold-crank, load-dump, and reverse-battery events. |
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 | 4A max output current; identical pinout, package, and feature set; lower current rating limits use in 5A+ FPGA designs. | Suitable for mid-tier SoCs or dual-core μPs where peak load remains ≤4A. | Select when system load profile confirms sustained current stays below 4A-enables drop-in replacement with no layout change. |
| MPQ4433AGL-AEC1-Z | 5A rating, AEC-Q100 Grade 1, but uses current-mode control with different compensation structure and no internal soft-stop discharge. | Requires external discharge circuitry for safe shutdown; lacks 100% duty cycle capability for ultra-low dropout. | Choose when needing extended temperature range (–40°C to +125°C) and higher ESD rating (8kV HBM), but accept added external components. |
Compared with ISL78235ARZ, ISL78234ARZ offers identical integration and footprint at reduced current capacity, while MPQ4433AGL-AEC1-Z trades soft-stop and 100% duty cycle for broader temp range and higher ESD tolerance-requiring careful evaluation of system-level safety and dropout requirements.
Availability
ISL78235ARZ is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, and embedded SoC power delivery requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for ISL78235ARZ 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 functional-safety and AEC-Q100-compliant design.
The ISL78235ARZ belongs to Renesas' ISL7823x automotive buck regulator family, engineered specifically for high-reliability, high-efficiency point-of-load power in infotainment, ADAS, and body electronics.
FAQ
What is the maximum continuous output current supported by the ISL78235ARZ?
The ISL78235ARZ delivers 5A of continuous output current across its specified operating temperature range of –40°C to +105°C when mounted on a properly designed PCB with adequate thermal vias to the SGND plane. This rating assumes use of the 3mm×3mm TQFN package with exposed pad soldered to a thermal plane and input voltage between 2.7V and 5.5V.
Does the ISL78235ARZ support both PFM and PWM modes, and how is mode selection implemented?
Yes, the ISL78235ARZ supports both discontinuous conduction mode (PFM) for light-load efficiency and forced continuous conduction mode (PWM) for low-noise operation. Mode selection is controlled via the SYNC pin: logic low (or GND) enables PFM, logic high (or VIN) enables forced PWM, and an external clock signal enables synchronized PWM-all without disabling the device.
What thermal performance can be expected from the ISL78235ARZ in its 3mm×3mm TQFN package?
In the 3mm×3mm TQFN package, the ISL78235ARZ has a junction-to-ambient thermal resistance (θJA) of 43°C/W under standard test conditions. With proper PCB layout-including multiple thermal vias under the exposed pad connected to a solid SGND plane-it sustains 5A output at +105°C ambient without thermal shutdown, as verified in Renesas' FN8713 datasheet Figure 9 and Table 7.
How does the ISL78235ARZ handle output short-circuit conditions?
The ISL78235ARZ responds to output short-circuit with hiccup-mode current limiting: it disables switching for ~8 soft-start cycles (≈8ms), then attempts restart. This protects internal MOSFETs and external components while maintaining thermal safety. The behavior is confirmed in the "Overcurrent Protection" section of the FN8713 datasheet and validated in Figure 38's hiccup waveform.
Is the ISL78235ARZ pin-compatible with other members of the ISL7823x family, and what design benefit does that provide?
Yes, the ISL78235ARZ shares identical pinout and package footprint with ISL78233ARZ (3A) and ISL78234ARZ (4A). This commonality allows hardware designers to scale power delivery across product tiers-e.g., upgrading from 3A to 5A-without modifying PCB layout, reducing validation effort and accelerating time-to-market for derivative automotive platforms.
ISL78235ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tray
- 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-TQFN (3x3)
ISL78235ARZ FAQ
1.How can I place an order for ISL78235ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78235ARZ 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 ISL78235ARZ reliable?
The price and inventory of ISL78235ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78235ARZ is usually 5 days.
3.What payment methods are accepted for ISL78235ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78235ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78235ARZ?
ISL78235ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78235ARZ 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 ISL78235ARZ?
For technical support, including ISL78235ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78235ARZ requirements.
6.How does Aetrix verify that ISL78235ARZ is sourced from the original manufacturer or authorized distributors?
All ISL78235ARZ 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 ISL78235ARZ meets industry standards.
7.What is the process for return or replacement of ISL78235ARZ?
All ISL78235ARZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL78235ARZ, 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 ISL78235ARZ part is unused and in its original packaging.
Return procedure for ISL78235ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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