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Renesas ISL85403DEMO1Z
- Part No.:
- ISL85403DEMO1Z
- Manufacturer:
- Renesas
- Package:
- Datasheet:
-
ISL85403DEMO1Z.pdf
- Description:
- EVAL BOARD FOR ISL85403
- Quantity:
- Payment:
- Shipping:
Inventory:3,329
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Product details
Overview
The ISL85403DEMO1Z from Renesas Electronics is a demonstration board designed to evaluate the ISL85403 synchronous buck DC/DC converter, supporting 7V–40V input and delivering a fixed 5V/2.5A output with 93% peak efficiency at 12V input and 50% load.
For engineers reviewing the ISL85403DEMO1Z datasheet, ISL85403DEMO1Z pinout (J1–J11, U1 IC interface), ISL85403DEMO1Z application (POE-powered industrial sensors, 24V rail conversion, compact 5V point-of-load), or ISL85403DEMO1Z equivalent, this board provides validated reference design, thermal layout guidance, and performance characterization under real load and line conditions.
Technical Context
The ISL85403DEMO1Z implements the ISL85403 IC in a fixed-frequency (500kHz default) synchronous buck topology, using an integrated 127mΩ high-side MOSFET and external low-side FET (NTTFS5826NLTAG). It supports PFM/PWM mode selection via J5 and external clock synchronization via J7 (SYNC).
Output voltage is set to 5V by R3/R4 feedback network (232kΩ/44.2kΩ), adjustable down to 0.8V per ISL85403 specs; output ripple is 50mVpp at full 2.5A load. Input capacitors are placed adjacent to VIN and PGND pins to minimize switching loop inductance, and the QFN-20 IC's EP pad is connected to multi-layer ground plane via ≥9 vias for thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 7V to 40V - supports wide industrial and PoE+ input rails without pre-regulation. |
| Output Voltage | Fixed 5.0V - factory-configured for USB-compliant downstream power; adjustable via R3/R4 per Equation 1. |
| Max Output Current | 2.5A continuous - validated with thermal derating up to 40°C ambient using onboard layout and component selection. |
| Switching Frequency | 500kHz (default, FS pin open) - balances efficiency and size; programmable via R1 resistor or synchronized externally via J7. |
| Output Ripple | 50mVpp at 2.5A load - measured across C2/C11 output caps; meets typical digital logic supply noise budgets. |
| Peak Efficiency | 93% at 12V input, 1.25A load - reflects optimized gate drive, low-RDS(on) FETs, and minimized PCB parasitics. |
Availability
The ISL85403DEMO1Z is available at Aetrix Electronics and suitable for industrial sensor nodes, 24V-to-5V embedded power supplies, and PoE-powered edge devices requiring stable component supply and rapid prototyping validation.
Supply support for ISL85403DEMO1Z 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 timing solutions for industrial, automotive, and infrastructure applications.
The ISL85403DEMO1Z belongs to Renesas' evaluation platform portfolio for its ISL85403 flexible buck regulator family, engineered to accelerate adoption of compact, high-efficiency point-of-load converters in space-constrained systems.
FAQ
What is the primary function of the ISL85403DEMO1Z?
The ISL85403DEMO1Z is a demonstration board that enables rapid evaluation of the ISL85403 synchronous buck DC/DC converter. It delivers a fixed 5V/2.5A output from a 7V–40V input, featuring validated thermal layout, performance curves, and configuration options including PFM/PWM mode selection and external clock synchronization. The ISL85403DEMO1Z is not a standalone power module but a reference design tool for system-level integration.
Can the output voltage of the ISL85403DEMO1Z be adjusted, and how?
Yes, the ISL85403DEMO1Z output voltage is adjustable from 0.8V to 5V using the feedback resistors R3 (232kΩ) and R4 (44.2kΩ); changing their values recalculates VOUT per Equation 1 in the user manual. To increase VOUT beyond 5V, higher-voltage-rated output capacitors (e.g., C2/C11) must be substituted per the note in AN1960. The ISL85403DEMO1Z ships configured for 5V, but the schematic and BOM support reconfiguration.
Does the ISL85403DEMO1Z support external frequency synchronization?
Yes, the ISL85403DEMO1Z supports external clock synchronization via the SYNC terminal (J7), allowing alignment of the ISL85403's switching frequency with an external source to reduce EMI in multi-rail systems. This functionality is enabled by connecting a clean clock signal to J7, as documented in the ISL85403 datasheet and verified on the ISL85403DEMO1Z board. The ISL85403DEMO1Z defaults to 500kHz when J7 is unconnected.
What is the maximum load current the ISL85403DEMO1Z can sustain continuously?
The ISL85403DEMO1Z is rated for 2.5A continuous output current under standard test conditions (12V input, 25°C ambient, natural convection). Performance curves in AN1960 confirm stable regulation and thermal behavior up to this level, with output ripple held to 50mVpp. Sustained operation above 2.5A requires additional heatsinking or forced airflow, as the board's thermal design targets the ISL85403's internal limits and component ratings.
How do I configure the ISL85403DEMO1Z for PWM versus PFM operation?
The ISL85403DEMO1Z uses test point J5 (MODE) to select operating mode: shorting J5 to ground configures the ISL85403 for forced PWM mode, ensuring constant frequency under light loads; leaving J5 open enables automatic PFM mode for improved light-load efficiency. This configuration is implemented directly on the ISL85403 IC and verified in the ISL85403DEMO1Z functional description and quick test setup section of AN1960.
ISL85403DEMO1Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Down
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 5V
- Voltage - Input:
- 2.5A
- Regulator Topology:
- 7V ~ 40V
- Frequency - Switching:
- Buck
- Contents:
- 500kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- ISL85403
ISL85403DEMO1Z FAQ
1.How can I place an order for ISL85403DEMO1Z through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85403DEMO1Z 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 ISL85403DEMO1Z reliable?
The price and inventory of ISL85403DEMO1Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85403DEMO1Z is usually 5 days.
3.What payment methods are accepted for ISL85403DEMO1Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85403DEMO1Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85403DEMO1Z?
ISL85403DEMO1Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85403DEMO1Z 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 ISL85403DEMO1Z?
For technical support, including ISL85403DEMO1Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85403DEMO1Z requirements.
6.How does Aetrix verify that ISL85403DEMO1Z is sourced from the original manufacturer or authorized distributors?
All ISL85403DEMO1Z 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 ISL85403DEMO1Z meets industry standards.
7.What is the process for return or replacement of ISL85403DEMO1Z?
All ISL85403DEMO1Z units undergo pre-shipment inspection (PSI). If there is an issue with ISL85403DEMO1Z, 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 ISL85403DEMO1Z part is unused and in its original packaging.
Return procedure for ISL85403DEMO1Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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