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Renesas ISL78236ARZ-T
- Part No.:
- ISL78236ARZ-T
- Manufacturer:
- Renesas
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ISL78236ARZ-T.pdf
- Description:
- IC REG BUCK ADJ 3A DL 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
ISL78236ARZ-T from Renesas (formerly Intersil) is a dual-channel, 3A/3A synchronous buck regulator with integrated P/N-channel MOSFETs, operating at 2.5MHz fixed frequency and supporting 2.8V–6V input for automotive point-of-load applications. It delivers up to 95% efficiency, features 180° out-of-phase operation to reduce input RMS current and EMI, and supports current sharing mode for single 6A output. Used in infotainment systems and DSP power supplies.
For engineers reviewing the ISL78236ARZ-T datasheet, ISL78236ARZ-T pinout, ISL78236ARZ-T application, or ISL78236ARZ-T equivalent, key selection criteria include AEC-Q100 qualification, -40°C to +105°C automotive temperature range, dual independent enable/control, internal soft-start, and reverse overcurrent protection - all critical for safety-critical embedded power designs.
Technical Context
The ISL78236ARZ-T implements peak-current-mode PWM control per channel with independent transconductance error amplifiers, 0.8V feedback reference, and internal slope compensation. Each channel integrates low-RDS(on) P- and N-channel MOSFETs (≤75mΩ at 5.5V), enabling 100% duty-cycle operation for ultra-low dropout (<250mV at 3A).
It supports dual-output mode (independent 3A channels) and current-sharing mode (combined 6A output) via COMP pin configuration and external RC network. Phase shift is fixed at 180°, synchronization accepts 6–8MHz external clock, and hiccup-mode short-circuit protection activates on ±2.5A–±5.5A overcurrent thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.85V to 6V - supports single Li⁺ cell, 3×NiMH, or regulated 3V/5V bus without pre-regulation. |
| Output Current per Channel | 0A to 3A - enables dual independent loads or combined 6A current sharing with matched load balancing. |
| Switching Frequency | 2.15–2.85MHz (typ. 2.5MHz) - allows compact 0.6µH inductors and <1.5cm² total PCB area. |
| Feedback Reference Voltage | 0.784V to 0.810V (2% accuracy over temp) - ensures stable 1.2V–3.3V output regulation with external resistor dividers. |
| Efficiency | Up to 95% at 3A - achieved via integrated MOSFETs and optimized gate drive, reducing thermal stress in confined automotive modules. |
| Operating Temperature | -40°C to +105°C - AEC-Q100 qualified for under-hood and infotainment ECUs without derating. |
| Duty Cycle Range | 0% to 100% - maintains regulation as battery voltage drops below output, extending usable runtime in automotive start-stop cycles. |
Pinout & Package
The ISL78236ARZ-T is housed in a thermally enhanced 24-lead 4mm × 4mm QFN package (1mm max height) with exposed thermal pad connected to SGND. Pin layout supports symmetric PCB routing for dual-channel symmetry and low-inductance PGND paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1 / LX2 | Switch node (Ch1 / Ch2) | Connects to external inductor; high dv/dt node requiring tight loop layout and Kelvin sensing for stability. |
| PGND1 / PGND2 | Power ground (Ch1 / Ch2) | Separate low-impedance return paths for each channel's high-side/lower-side FETs to minimize cross-talk and EMI. |
| FB1 / FB2 | Feedback input (Ch1 / Ch2) | High-impedance (1µA bias) node monitoring output voltage via resistor divider; used for PG and UVLO detection. |
| EN1 / EN2 | Enable input (Ch1 / Ch2) | CMOS-compatible logic inputs enabling independent power sequencing; low state discharges output capacitor via 80–120Ω internal switch. |
| PG1 / PG2 | Power-good indicator (Ch1 / Ch2) | Active-high open-drain output with 1ms delay after regulation; asserts only when VOUT is within ±8% of target. |
| SYNC | External clock input | Negative-edge-triggered; accepts 6–8MHz signal to synchronize switching and reduce system-level EMI coupling. |
| COMP | Compensation node | No-connect in dual-output mode; requires external RC network in current-sharing mode to stabilize parallel-loop dynamics. |
| VIN1 / VIN2 | Input supply (Ch1 / Ch2) | Independent input pins allow separate input filtering per channel; each requires local 22µF ceramic capacitor to PGND. |
| VDD | Logic supply | Bias rail referenced to VIN ±0.5V; powers internal logic and must be decoupled locally to SGND. |
| SS | Soft-start timing | Internal 5µA current source charges external capacitor; tSS = 6.25·CSS (µF) in seconds; max 33nF recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated P/N-channel MOSFETs | Reduces BOM count by eliminating 4 external FETs and associated gate drivers; RDS(on) ≤75mΩ enables high efficiency at 3A. |
| 180° interleaved operation | Cuts input ripple current amplitude by ~70% vs. in-phase operation, easing input capacitor sizing and reducing EMI filter complexity. |
| Reverse overcurrent protection | Detects -1.5A to -3.5A reverse current on LX nodes, preventing damage during output short-circuit or forced discharge events. |
| Independent channel enable & PG | Enables precise power-up/down sequencing for multi-rail processors (e.g., FPGA core/I/O rails) and fault-isolated diagnostics. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use with full temperature range (-40°C to +105°C), ESD robustness (4kV HBM), and latch-up immunity (100mA). |
Applications
| Infotainment System Power | DSP/FPGA Core Supply |
|---|---|
Use Scenario: Powering audio DSPs, display controllers, and connectivity modules in automotive head units. IC Role / Device Role / Timing Role: Dual-output buck regulator delivering 1.2V/3A for processor core and 1.8V/3A for I/O domain. Use Value: 180° phase shift minimizes conducted EMI into sensitive analog audio circuits, meeting CISPR-25 Class 5 limits. | Use Scenario: Providing tightly regulated, low-noise power to high-performance embedded processors in ADAS ECUs. IC Role / Device Role / Timing Role: Single-chip solution replacing two discrete regulators, with independent enable for controlled boot sequence. Use Value: Internal 2% reference accuracy and load regulation of 2mV/A ensure stable operation across wide temperature and load transients. |
| Automotive Point-of-Load Conversion | Current-Sharing High-Current Rail |
Use Scenario: Local DC-DC conversion near radar sensor ASICs or camera image signal processors. IC Role / Device Role / Timing Role: Compact 4mm×4mm regulator placed directly at load to minimize IR drop and noise coupling. Use Value: 1.5cm² footprint and 1mm profile meet strict space constraints in compact sensor modules. | Use Scenario: Generating 1.8V/6A for GPU or AI accelerator subsystems requiring >3A per rail. IC Role / Device Role / Timing Role: Configured in current-sharing mode with external COMP network to balance output currents within ±5%. Use Value: Matched amplifier gain (±0.05V/A) and dynamic current limit (4.8A typ.) ensure balanced thermal distribution across both channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ4436-AEC1 | 4.5–36V input range; 3.5A per channel; 400kHz–2.5MHz programmable frequency; no 100% duty cycle support. | Targets higher-input industrial/ADAS cameras; lacks reverse OCP and AEC-Q100 Grade 1 extended temp rating. | Choose MPQ4436-AEC1 only if input exceeds 6V or programmable frequency is required; verify thermal performance at 105°C ambient. |
| TPS543B20RMLR | Single-channel 10A; 4.5–18V input; PMBus interface; 2.2MHz fixed frequency; no current-sharing capability. | Used in server-grade automotive gateways; requires external sequencing IC for dual-rail control. | Choose TPS543B20RMLR only for single-rail >6A needs; ISL78236ARZ-T remains optimal for dual 3A with independent control and smaller footprint. |
Compared with MPQ4436-AEC1 and TPS543B20RMLR, the ISL78236ARZ-T uniquely combines AEC-Q100 Grade 1 qualification, true 100% duty cycle, reverse OCP, and native dual-channel current sharing in a 4mm×4mm package - making it the only fit for space-constrained, safety-critical dual-rail automotive SoC power.
Availability
ISL78236ARZ-T is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS domain controllers, and embedded DSP power supplies requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for ISL78236ARZ-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 Corporation is a global semiconductor leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and IoT markets.
The ISL78236ARZ-T belongs to Renesas' automotive-qualified power management portfolio, designed specifically for high-efficiency, low-EMI point-of-load conversion in safety-critical vehicle subsystems.
FAQ
What is the maximum input voltage the ISL78236ARZ-T can handle continuously?
The ISL78236ARZ-T supports continuous input voltages from 2.85V to 6V. Absolute maximum ratings allow brief exposure (≤20ms) to 7V, but sustained operation above 6V risks permanent damage. This range accommodates single-cell Li⁺ batteries and standard 3.3V/5V system rails without external pre-regulation.
Does the ISL78236ARZ-T support independent output voltage programming for each channel?
Yes, the ISL78236ARZ-T supports fully independent output voltage programming via separate FB1 and FB2 pins. Each uses an external resistor divider to set its output from 1.2V to 3.3V, with 0.8V internal reference and 2% accuracy over -40°C to +105°C. No shared components are required between channels.
How does the ISL78236ARZ-T achieve 100% duty cycle operation, and why is it important?
The ISL78236ARZ-T achieves 100% duty cycle by disabling the low-side N-channel MOSFET and holding the high-side P-channel MOSFET on continuously. This enables regulation even when input voltage drops close to the output voltage - critical for maintaining power during automotive cold-crank events where battery voltage falls below 4V.
Can the ISL78236ARZ-T be synchronized to an external clock, and what is the acceptable frequency range?
Yes, the ISL78236ARZ-T accepts external synchronization on the SYNC pin with negative-edge triggering. The supported input frequency range is 6MHz to 8MHz. When synchronized, each channel operates at half the input frequency (e.g., 3–4MHz), allowing precise EMI frequency placement and reduction of beat frequencies in multi-converter systems.
What thermal management features does the ISL78236ARZ-T include to ensure reliability in automotive environments?
The ISL78236ARZ-T includes thermal shutdown at +150°C with 25°C hysteresis, plus low thermal resistance (θJA = 36°C/W, θJC = 2°C/W) enabled by its exposed thermal pad. The pad must be soldered to SGND with multiple vias to an internal ground plane - a requirement validated in AEC-Q100 testing for sustained +105°C ambient operation.
ISL78236ARZ-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.85V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
ISL78236ARZ-T FAQ
1.How can I place an order for ISL78236ARZ-T through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL78236ARZ-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 ISL78236ARZ-T reliable?
The price and inventory of ISL78236ARZ-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL78236ARZ-T is usually 5 days.
3.What payment methods are accepted for ISL78236ARZ-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL78236ARZ-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL78236ARZ-T?
ISL78236ARZ-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL78236ARZ-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 ISL78236ARZ-T?
For technical support, including ISL78236ARZ-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL78236ARZ-T requirements.
6.How does Aetrix verify that ISL78236ARZ-T is sourced from the original manufacturer or authorized distributors?
All ISL78236ARZ-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 ISL78236ARZ-T meets industry standards.
7.What is the process for return or replacement of ISL78236ARZ-T?
All ISL78236ARZ-T units undergo pre-shipment inspection (PSI). If there is an issue with ISL78236ARZ-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 ISL78236ARZ-T part is unused and in its original packaging.
Return procedure for ISL78236ARZ-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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