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Renesas ISL78235ARZ-T7A
- Part No.:
- ISL78235ARZ-T7A
- Manufacturer:
- Renesas
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ISL78235ARZ-T7A.pdf
- Description:
- IC REG BUCK ADJ 5A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,639
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Product details
Overview
ISL78235ARZ-T7A 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 infotainment systems.
For engineers reviewing the ISL78235ARZ-T7A datasheet, ISL78235ARZ-T7A pinout, ISL78235ARZ-T7A application, or ISL78235ARZ-T7A equivalent, key selection criteria include AEC-Q100 qualification, 100% duty cycle capability (<250mV dropout at 5A), hiccup-mode OCP, soft-stop discharge, and compatibility with 3mm×3mm TQFN thermal design constraints.
Technical Context
The ISL78235ARZ-T7A implements peak current mode control with slope compensation to ensure loop stability across wide VIN/VOUT ratios and load transients. Its 100ns minimum on-time enables regulation down to 1.0V from 3.3V input while maintaining 2MHz operation.
It supports dual operating modes: forced PWM (low-noise, fixed-frequency) via SYNC high, or PFM (high-efficiency light-load) via SYNC low-both with seamless external synchronization (1–4MHz). Internal 1ms PG timer and 1% reference accuracy over temperature support robust power sequencing in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5A continuous - supports high-power μC/FPGA cores without external current sharing. |
| Input Voltage Range | 2.7V to 5.5V - compatible with automotive 3.3V/5V rails and battery-supplied systems. |
| Switching Frequency | Adjustable 500kHz–4MHz; default 2MHz - balances EMI, efficiency, and inductor size. |
| HS/LS RDS(on) | 35mΩ / 11mΩ typical - minimizes conduction loss and enables >95% peak efficiency. |
| Reference Accuracy | ±1% over -40°C to +105°C - ensures tight output regulation across automotive temperature range. |
| Power-Good Delay | 1ms fixed - provides deterministic sequencing window for downstream logic initialization. |
| Duty Cycle Range | 0–100% - supports ultra-low dropout operation (e.g., 3.3V→3.0V @ 5A). |
Pinout & Package
ISL78235ARZ-T7A 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 ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1,16) | Input power supply | Primary DC input connection; requires dual 22µF ceramic decoupling close to pins. |
| PHASE (13–15) | Switching node | Connects to inductor; internally discharged via 100Ω resistor during shutdown. |
| PGND (11,12) | Power ground return | High-current return path for HS/LS FETs; separate from SGND to reduce noise coupling. |
| SGND (10) | Signal ground reference | Reference for FB, COMP, EN, FS, SS; must be connected to PGND at single point. |
| FB (9) | Feedback input | Monitors output voltage via resistor divider; used for regulation, PG, and UVLO detection. |
| EN (5) | Enable control | Active-high logic input; asserts soft-stop discharge when pulled low. |
| SYNC (4) | Mode/synchronization | Selects PFM/PWM mode or accepts external clock (1–4MHz); internal 1MΩ pull-down. |
| FS (6) | Frequency set | Resistor-to-ground sets fSW; 0Ω (to VIN) configures 2MHz default. |
| SS (7) | Soft-start timing | 1ms internal ramp when tied to SGND; capacitor extends ramp for controlled VOUT rise. |
| COMP (8) | Error amplifier output | Internal compensation if tied to VDD; external network required otherwise for loop stability. |
| PG (3) | Power-good indicator | Open-drain output with 1ms delay; requires external pull-up to VIN for system monitoring. |
| VDD (2) | Logic supply | Internally regulated rail for control circuitry; connect directly to VIN with 0.1µF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power FETs | 35mΩ P-ch HS + 11mΩ N-ch LS - eliminates external MOSFETs and gate drivers, reducing BOM count and layout area. |
| 100% Duty Cycle Operation | Enables <250mV dropout at 5A - critical for post-regulation in low-VIN automotive scenarios (e.g., cold-crank). |
| Hiccup-Mode OCP | Auto-restart protection during short-circuit - limits thermal stress and avoids latch-up in fault conditions. |
| Soft-Stop Output Discharge | 100Ω internal switch discharges VOUT during disable - prevents back-powering of downstream circuits. |
| AEC-Q100 Qualified | Grade 1 (-40°C to +125°C junction) - validated for automotive infotainment and ADAS subsystems. |
Applications
| Automotive Infotainment Power | μC/FPGA Core Supply |
|---|---|
|
Use Scenario: Powering ARM-based SoCs and display controllers in head units under varying battery voltage (6–16V with LDO pre-regulation). IC Role / Device Role / Timing Role: Primary POL buck regulator delivering 1.2V/1.8V/3.3V at up to 5A with fast transient response. Use Value: 100ns min on-time and 2MHz switching enable compact 0.68µH inductor and tight output regulation during audio/video burst loads. |
Use Scenario: Providing clean, sequenced core voltage to automotive-grade microcontrollers (e.g., RH850, S32K) during startup and sleep transitions. IC Role / Device Role / Timing Role: Enable-controlled, PG-monitored DC/DC converter with 1ms soft-start and 1ms PG assertion delay. Use Value: Integrated soft-start and power-good signaling eliminate need for external supervisors, simplifying power tree design. |
| Video Processor SoC Power | DC/DC POL Module |
|
Use Scenario: Supplying dynamic voltage scaling (DVS) rails to image signal processors (ISPs) and GPU accelerators in camera modules. IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator supporting PFM for idle efficiency and PWM for low-noise active mode. Use Value: Dual-mode operation achieves >90% efficiency at 10mA (PFM) and <15mV p-p ripple at 5A (PWM), meeting both power and EMI requirements. |
Use Scenario: Embedded in compact, thermally constrained DC/DC modules for ADAS ECUs requiring high reliability and minimal footprint. IC Role / Device Role / Timing Role: Monolithic 5A regulator with wettable flank–compatible 3mm×3mm TQFN package and EPAD thermal path. Use Value: 43°C/W θJA and exposed pad vias enable >4W dissipation in 100mm² PCB area - suitable for unforced-air module designs. |
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-T7A | 4A max output, identical pinout and feature set - lower current rating, same thermal profile. | Suitable for lower-power SoCs or dual-rail designs where 5A headroom is unnecessary. | Select when load current remains ≤4A to reduce cost and thermal margin overhead. |
| MPQ4433AGL-AEC1-Z | 5A AEC-Q100 buck with 3.8–36V input, 500kHz–2.5MHz fSW, but no PFM mode or soft-stop discharge. | Better suited for 12V automotive direct-input applications; lacks ISL78235ARZ-T7A's low-VIN optimization. | Choose for higher-input systems where 2.7V start-up and hiccup-mode OCP are not required. |
Compared with ISL78234ARZ-T7A, the ISL78235ARZ-T7A provides 25% higher current capacity in identical footprint; versus MPQ4433AGL-AEC1-Z, it offers superior light-load efficiency via PFM and safer shutdown behavior via soft-stop discharge - critical for infotainment power integrity.
Availability
ISL78235ARZ-T7A is available at Aetrix Electronics and suitable for automotive infotainment power, μC/FPGA core supply, and video processor SoC power requiring stable component supply across extended temperature ranges and AEC-Q100 compliance.
Supply support for ISL78235ARZ-T7A 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 ICs, with deep expertise in functional safety and AEC-Q100 qualification.
The ISL78235ARZ-T7A belongs to Renesas' ISL7823x automotive buck regulator family, designed specifically for high-efficiency, high-reliability point-of-load conversion in infotainment, ADAS, and body electronics.
FAQ
What is the maximum ambient temperature rating for the ISL78235ARZ-T7A?
The ISL78235ARZ-T7A in the 3mm×3mm TQFN package is rated for -40°C to +105°C ambient operation, with junction temperature extending to +125°C. This rating is explicitly confirmed in the Ordering Information table (Page 5) and Recommended Operating Conditions (Page 7) of the FN8713 datasheet.
Does the ISL78235ARZ-T7A support external frequency synchronization?
Yes, the ISL78235ARZ-T7A supports external synchronization from 1MHz to 4MHz via the SYNC pin using a positive-edge-triggered clock signal. During synchronization, the device operates in forced PWM mode, and the transition between internal oscillator and external clock is seamless without requiring shutdown.
How does the soft-stop function work on the ISL78235ARZ-T7A during shutdown?
When the EN pin is driven low, the ISL78235ARZ-T7A activates an internal 100Ω discharge switch between the PHASE node and PGND, actively sinking current from the output capacitor to safely discharge VOUT. This prevents back-powering of downstream circuitry and is documented in the Functional Block Diagram (Page 3) and Pin Descriptions (Page 4).
Is the ISL78235ARZ-T7A pin-compatible with other devices in the ISL7823x family?
Yes, the ISL78235ARZ-T7A shares identical pinout and package with ISL78233ARZ-T7A (3A) and ISL78234ARZ-T7A (4A), enabling migration from 3A to 5A without PCB changes. This common pinout family is explicitly stated in the datasheet Features section (Page 1) and Figure 1 caption.
What protection features are integrated into the ISL78235ARZ-T7A?
The ISL78235ARZ-T7A integrates hiccup-mode overcurrent protection (OCP), output overvoltage protection (OVP), over-temperature protection (OTP), input undervoltage lockout (UVLO), and negative current limiting. All are detailed in the Datasheet Sections 1.1 (Features), 7 (Overcurrent Protection), and 17 (Thermal Shutdown).
ISL78235ARZ-T7A 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-T7A FAQ
1.How can I place an order for ISL78235ARZ-T7A through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78235ARZ-T7A 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-T7A reliable?
The price and inventory of ISL78235ARZ-T7A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78235ARZ-T7A is usually 5 days.
3.What payment methods are accepted for ISL78235ARZ-T7A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78235ARZ-T7A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78235ARZ-T7A?
ISL78235ARZ-T7A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78235ARZ-T7A 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-T7A?
For technical support, including ISL78235ARZ-T7A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78235ARZ-T7A requirements.
6.How does Aetrix verify that ISL78235ARZ-T7A is sourced from the original manufacturer or authorized distributors?
All ISL78235ARZ-T7A 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-T7A meets industry standards.
7.What is the process for return or replacement of ISL78235ARZ-T7A?
All ISL78235ARZ-T7A units undergo pre-shipment inspection (PSI). If there is an issue with ISL78235ARZ-T7A, 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-T7A part is unused and in its original packaging.
Return procedure for ISL78235ARZ-T7A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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