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Renesas ISL78235ARZ-T
- Part No.:
- ISL78235ARZ-T
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL78235ARZ-T.pdf
- Description:
- IC REG BUCK ADJ 5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,944
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Product details
Overview
ISL78235ARZ-T 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 infotainment power rails in AEC-Q100 qualified systems.
For engineers reviewing the ISL78235ARZ-T datasheet, ISL78235ARZ-T pinout, ISL78235ARZ-T application, or ISL78235ARZ-T equivalent, key selection criteria include its 100ns minimum on-time for wide VIN/VOUT ratios, hiccup-mode OCP, soft-stop output discharge, 1ms PG delay, and dual-package support (3×3mm TQFN and 5×5mm WFQFN) with distinct thermal ratings.
Technical Context
The ISL78235ARZ-T employs peak current mode control with slope compensation to ensure loop stability across 500kHz–4MHz adjustable switching frequencies and supports seamless external synchronization from 1MHz to 4MHz. Its architecture enables fast transient response and low-duty-cycle operation down to sub-250mV dropout at 5A.
It integrates dual MOSFET drivers, internal/external compensation options, programmable soft-start (1ms fixed or capacitor-adjustable), and fault protections including OTP, OCP (hiccup mode), output OVP, and input UVLO. The device operates in either forced PWM or PFM mode via the SYNC pin, optimizing efficiency versus EMI trade-offs.
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 SoC, DSP, and video processor core supplies. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 2MHz - balances size (inductor/capacitor), efficiency, and EMI. |
| HS/LS RDS(on) | 35mΩ / 11mΩ typical - minimizes conduction loss and improves full-load efficiency up to 95%. |
| Reference Accuracy | ±1% over temperature - ensures tight output regulation for sensitive digital loads. |
| Power-Good Delay | 1ms fixed (with SS = SGND) - provides deterministic system sequencing timing. |
| Thermal Rating | −40°C to +105°C (3×3mm TQFN) - validated for under-hood automotive ambient conditions. |
Pinout & Package
The ISL78235ARZ-T is packaged in a RoHS-compliant 3mm×3mm, 16-lead Thin Quad Flat No-Lead (TQFN) with exposed thermal pad (EPAD), rated for −40°C to +105°C operation. The EPAD must be soldered to SGND for electrical integrity and optimal thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,16) | Input power supply | Primary DC input node; requires ≥2×22µF ceramic decoupling close to pins. |
| PHASE (13–15) | Switching node | Connects to inductor; internally discharged via 100Ω resistor during shutdown. |
| FB (9) | Feedback input | Sets output voltage via resistor divider; also used for PG and UVLO monitoring. |
| EN (5) | Enable control | Active-high logic input; disables regulator and initiates soft-stop output discharge. |
| PG (3) | Power-good indicator | Open-drain output with 1ms delay after VOUT reaches regulation; requires external pull-up. |
| SYNC (4) | Mode/synchronization | Selects PFM/PWM mode or accepts external sync clock (1–4MHz positive-edge trigger). |
| FS (6) | Frequency set | Resistor-to-GND sets fSW from 500kHz to 4MHz; tied to VIN for 2MHz default. |
| SS (7) | Soft-start control | 1ms internal ramp when grounded; capacitor-to-SGND extends soft-start time. |
Key Features
| Feature | Design Value |
|---|---|
| 100% duty cycle operation | Enables <250mV dropout at 5A, critical for low-VIN applications like battery backup rails. |
| 100ns guaranteed minimum on-time | Supports wide input-to-output voltage ratios (e.g., 5V→1.0V) without pulse-skipping instability. |
| Internal soft-stop discharge | 100Ω internal switch actively discharges output capacitor during disable, preventing backfeed. |
| AEC-Q100 qualification | Validated for automotive applications including infotainment, ADAS domain controllers, and body ECUs. |
| Common pinout family | Pin-compatible with ISL78233 (3A) and ISL78234 (4A), enabling scalable design migration without PCB change. |
Applications
| Microcontroller Core Power | FPGA I/O Bank Supply |
|---|---|
|
Use Scenario: Providing clean, tightly regulated 1.2V/1.8V to ARM Cortex-A/R series processors in automotive gateways. IC Role / Device Role / Timing Role: Primary POL buck regulator delivering 5A peak current with fast load transient response (<100µs recovery). Use Value: 1% reference accuracy and 100ns min-on-time maintain regulation during dynamic CPU DVFS transitions. |
Use Scenario: Powering configurable I/O banks of Xilinx Zynq or Intel Cyclone SoC-FPGAs in vehicle telematics units. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting multiple VCCIO levels (1.2V–3.3V) with independent sequencing. Use Value: Programmable soft-start (via SS pin) and PG signal enable safe, staggered power-up of multi-rail FPGA systems. |
| Automotive Infotainment SoC | Video Processor Core Rail |
|
Use Scenario: Supplying 1.0V/1.1V core voltage to Qualcomm SA8155P or NVIDIA Tegra Orin automotive SoCs. IC Role / Device Role / Timing Role: High-efficiency, low-noise POL regulator operating in forced PWM mode to suppress EMI near AM/FM receivers. Use Value: 2MHz default switching frequency allows compact 0.68µH inductors and reduces conducted emissions in crowded head-unit layouts. |
Use Scenario: Delivering 1.5V/1.8V to GPU cores in ADAS vision processors (e.g., TI TDA4VM) under burst-load conditions. IC Role / Device Role / Timing Role: Synchronous buck with hiccup-mode OCP and thermal shutdown protecting against sustained short-circuit faults. Use Value: Integrated 35mΩ/11mΩ MOSFETs and 95% peak efficiency minimize thermal stress in sealed infotainment enclosures. |
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-T | 4A max output current; identical pinout, package, and feature set except lower current rating. | Suitable where peak load current remains ≤4A; shares same layout and firmware interface. | Select when system margin allows derating; retains full compatibility for cost-sensitive 4A designs. |
| MPQ4433AGL-AEC1-Z | Monolithic 5A buck with 3.8–36V input, 2.2MHz fSW, but no PFM mode or SYNC input; AEC-Q100 Grade 1. | Broadens input range for 12V battery systems; lacks light-load efficiency optimization and external sync capability. | Choose for higher-VIN automotive applications where 2.7–5.5V input range is insufficient. |
Compared with ISL78235ARZ-T, ISL78234ARZ-T offers identical integration and footprint at reduced current capacity, while MPQ4433AGL-AEC1-Z trades PFM flexibility and sync capability for extended input voltage range-making each suitable for distinct automotive subsystem voltage architectures.
Availability
ISL78235ARZ-T is available at Aetrix Electronics and suitable for automotive infotainment power, microcontroller core supply, and FPGA I/O bank regulation requiring stable component supply across production lifecycles.
Supply support for ISL78235ARZ-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, and connectivity solutions for automotive, industrial, and IoT markets.
The ISL78235ARZ-T belongs to Renesas' ISL7823x automotive power management family, designed specifically for high-reliability, high-efficiency point-of-load regulation in safety-critical vehicle subsystems.
FAQ
What is the maximum output current supported by the ISL78235ARZ-T?
The ISL78235ARZ-T delivers up to 5A of continuous output current under recommended operating conditions (TA ≤ +105°C, 3×3mm TQFN package). Peak current limit is 7.8A typical at +25°C, derating to 6.1A across the full −40°C to +105°C range. Thermal performance must be verified per layout and airflow conditions.
Does the ISL78235ARZ-T support external frequency synchronization?
Yes, the ISL78235ARZ-T supports external synchronization via the SYNC pin, accepting a positive-edge-triggered clock signal from 1MHz to 4MHz. When synchronized, the device operates in forced PWM mode, and transitions between internal oscillator and external clock are seamless without requiring shutdown or reconfiguration.
How does the soft-start function work on the ISL78235ARZ-T?
The ISL78235ARZ-T provides flexible soft-start: connecting the SS pin to SGND enables a fixed 1ms internal ramp; adding a capacitor from SS to SGND extends the ramp time linearly (e.g., 10nF ≈ 10ms). This prevents inrush current and ensures controlled output voltage rise during power-up.
What protection features are integrated into the ISL78235ARZ-T?
The ISL78235ARZ-T integrates hiccup-mode overcurrent protection (OCP), output overvoltage protection (OVP), input undervoltage lockout (UVLO), thermal shutdown (150°C trip), and negative current limiting. All protections are fully autonomous and require no external components to activate.
Is the ISL78235ARZ-T pin-compatible with other devices in the ISL7823x family?
Yes, the ISL78235ARZ-T shares identical pinout and package dimensions with ISL78233ARZ-T (3A) and ISL78234ARZ-T (4A), enabling direct migration between current ratings without PCB redesign. This common footprint simplifies scalability across product variants and reduces qualification effort.
ISL78235ARZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 16-WFQFN 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-TQFN (3x3)
ISL78235ARZ-T FAQ
1.How can I place an order for ISL78235ARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78235ARZ-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 ISL78235ARZ-T reliable?
The price and inventory of ISL78235ARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78235ARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78235ARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78235ARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78235ARZ-T?
ISL78235ARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78235ARZ-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 ISL78235ARZ-T?
For technical support, including ISL78235ARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78235ARZ-T requirements.
6.How does Aetrix verify that ISL78235ARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78235ARZ-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 ISL78235ARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78235ARZ-T?
All ISL78235ARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78235ARZ-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 ISL78235ARZ-T part is unused and in its original packaging.
Return procedure for ISL78235ARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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