Renesas ISL85410DEMO1Z

Overview

ISL85410DEMO1Z from Renesas Electronics is a demonstration board designed to evaluate the ISL85410 synchronous buck regulator, a wide-input (3V–40V), low-quiescent-current DC/DC converter delivering up to 1A output at 3.3V with 500kHz fixed switching frequency, >84% peak efficiency, and <10mV output ripple - used for point-of-load power conversion in industrial and embedded systems.

For engineers reviewing the ISL85410DEMO1Z datasheet, ISL85410DEMO1Z pinout, ISL85410DEMO1Z application, or ISL85410DEMO1Z equivalent, this board enables rapid validation of input voltage range (3V–40V), load transient response (0A→1A step), PFM/PWM mode selection, and output voltage adjustability (0.6V–15V) under real-world thermal and layout conditions.

Technical Context

The ISL85410DEMO1Z implements the ISL85410 IC in a fully assembled, tested configuration with optimized passive component selection - including 22µH inductor (L1), 47µF + 22µF output capacitance (C5+C6), and 90.9kΩ/20kΩ feedback resistors (R1/R2) - preset for 3.3V output. It supports both internal soft-start (R15 = 0Ω) and external synchronization (SYNC pin configurable via R6).

Board-level features include selectable operating modes (PFM via SYNC-to-GND or forced PWM via S2 switch), adjustable switching frequency (300kHz–2MHz via FS pin resistor R12), and power-good (PG) and enable (EN) signal access via test points P1–P9 - all aligned with the ISL85410's integrated high-side/low-side NMOS architecture and no-compensation design.

Key Specifications

Availability

ISL85410DEMO1Z is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and point-of-load power system development requiring stable component supply, fast evaluation turnaround, and reference design traceability.

Supply support for ISL85410DEMO1Z 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 SoC solutions for automotive, industrial, and enterprise applications - with emphasis on reliability, integration, and system-level performance.

The ISL85410DEMO1Z belongs to Renesas' broad portfolio of evaluation platforms for high-efficiency DC/DC regulators, specifically engineered to accelerate adoption of wide-VIN synchronous buck converters in space-constrained, thermally demanding applications.

FAQ

What is the primary function of the ISL85410DEMO1Z?

The ISL85410DEMO1Z is a fully assembled demonstration board built around the ISL85410 synchronous buck regulator IC. Its purpose is to provide engineers with a ready-to-test platform for evaluating key performance metrics - including efficiency, load transient response, PFM/PWM mode behavior, and output voltage adjustability - under real-world conditions such as 24V input and 3.3V/1A output. The ISL85410DEMO1Z simplifies prototyping by integrating all necessary passives, test points, and mode-select jumpers.

Can the ISL85410DEMO1Z be used to evaluate other output voltages besides 3.3V?

Yes, the ISL85410DEMO1Z supports output voltage adjustment from 0.6V to 15V by modifying the feedback resistor divider (R1 and R2). The board ships with R1 = 90.9kΩ and R2 = 20kΩ for 3.3V, but Equation 1 in the AN1908 User's Manual provides the exact calculation. For outputs below 1.8V, switching frequency and compensation must be adjusted per the ISL85410 datasheet due to minimum on-time limitations - the ISL85410DEMO1Z accommodates this via FS and COMP pin access.

How does the ISL85410DEMO1Z support different operating modes like PFM and PWM?

The ISL85410DEMO1Z enables mode selection through its SYNC pin: tying SYNC to GND forces discontinuous conduction mode (PFM), while connecting it to VCC (default via R6 = 200kΩ) enables forced continuous conduction mode (PWM). A physical S2 switch allows manual toggling between these modes without soldering. This dual-mode capability lets users directly compare light-load efficiency (PFM) versus low-noise, constant-frequency operation (PWM) on the same ISL85410DEMO1Z board.

What input power supply requirements are needed to operate the ISL85410DEMO1Z?

The ISL85410DEMO1Z requires a 0V–50V DC power supply capable of delivering ≥2A source current, connected to VIN (test point P4) and GND (test point P5). Input voltage must remain within the ISL85410's 3V–40V operating range. An optional electrolytic capacitor (C10, 150µF/50V) is included to suppress transients caused by long test leads - it may be omitted in final system designs where parasitic inductance is minimal. The ISL85410DEMO1Z does not require auxiliary bias supplies.

Does the ISL85410DEMO1Z include provisions for synchronization with external clock sources?

Yes, the ISL85410DEMO1Z exposes the SYNC pin of the ISL85410 IC via test point P2, allowing connection to an external clock generator. When driven with a clean square wave within the device's specified frequency range (300kHz–2MHz), the ISL85410 synchronizes its internal switching to that signal - eliminating beat frequencies and enabling deterministic EMI reduction in multi-rail systems. The default configuration uses R6 to pull SYNC to VCC, but the ISL85410DEMO1Z supports direct signal injection without hardware modification.