Renesas ISL85410EVAL1Z

Overview

ISL85410EVAL1Z from Renesas Electronics is an evaluation board designed to characterize the ISL85410 1A synchronous buck regulator in point-of-load applications with 3V–40V input and 3.3V fixed output. It supports 500kHz switching frequency, achieves >84% peak efficiency at 50% load, delivers <3mV output ripple at 1.2A, and features PFM/PWM mode selection and power-good signaling.

For engineers reviewing the ISL85410EVAL1Z datasheet, ISL85410EVAL1Z pinout, ISL85410EVAL1Z application, or ISL85410EVAL1Z equivalent, this board enables rapid validation of wide-VIN DC/DC performance under real-world transient, thermal, and layout-sensitive conditions - especially for industrial power rails, embedded controllers, and distributed supply systems requiring low quiescent current and minimal external components.

Technical Context

The ISL85410EVAL1Z implements a complete reference design around the ISL85410FRZ 12-lead DFN (4mm × 3mm) buck controller, integrating all critical passive components including a 22µH power inductor (DR73-220-R), 69µF total output capacitance (C5 + C6), and precision feedback network (R1 = 90.9kΩ, R2 = 20kΩ) for 3.3V regulation. The board uses internal soft-start (R15 = 0Ω) and fixed 500kHz operation (R10 = 0Ω).

It provides accessible test points (P1–P10), dual-mode enable control (S1 toggle switch), SYNC pin configuration (R6 = 200kΩ to VCC for PWM default), and PG signal conditioning (open-drain with pull-up recommendation). Thermal management relies on an 8-via GND plane connection per the IC's PGND and GND pins, as specified in the ISL85410FRZ datasheet.

Key Specifications

Availability

ISL85410EVAL1Z is available at Aetrix Electronics and suitable for industrial power rail validation, embedded system bring-up, and distributed DC/DC design verification requiring stable component supply, fast turnaround, and full documentation traceability.

Supply support for ISL85410EVAL1Z 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 - with emphasis on high-efficiency, robust, and long-lifecycle components.

The ISL85410EVAL1Z belongs to Renesas' ISL854xx family of wide-VIN synchronous buck regulators, engineered specifically for point-of-load conversion in space-constrained, thermally demanding environments where low IQ and high light-load efficiency are critical.

FAQ

What is the primary function of the ISL85410EVAL1Z evaluation board?

The ISL85410EVAL1Z evaluation board is a fully assembled, tested platform for evaluating the ISL85410 1A synchronous buck regulator. It enables engineers to validate electrical performance-including efficiency, transient response, ripple, and thermal behavior-under real operating conditions (3V–40V input, 3.3V/1A output) without designing custom hardware. The ISL85410EVAL1Z includes all necessary passives, test points, and configuration jumpers per the ISL85410FRZ datasheet.

Can the ISL85410EVAL1Z be used to evaluate other regulators like the ISL854102 or ISL85418?

No - the ISL85410EVAL1Z is specifically configured for the ISL85410 (1A version) and populated with the ISL85410FRZ IC. While it shares mechanical layout and schematic topology with ISL854102EVAL1Z and ISL85418EVAL1Z, each board uses its respective IC (ISL854102FRZ or ISL85418FRZ) and optimized component values. Using ISL85410EVAL1Z for other variants would yield invalid performance data due to mismatched current capability, compensation, and thermal limits.

How is output voltage adjusted on the ISL85410EVAL1Z?

Output voltage on the ISL85410EVAL1Z is set by the R1/R2 feedback divider per Equation 1: VOUT = 0.6 × (1 + R2/R1). The board ships with R1 = 90.9kΩ and R2 = 20kΩ for 3.3V. To change VOUT, replace R2 per Table 1 - e.g., 4.75kΩ for 12V. Note that for VOUT < 1.8V, switching frequency must be reduced to 300kHz to avoid minimum on-time limitations, requiring resistor changes at R12 and possibly R11.

Does the ISL85410EVAL1Z support external clock synchronization?

Yes - the ISL85410EVAL1Z exposes the SYNC pin (U1 Pin 2) with a 200kΩ pull-up to VCC (R6) by default, enabling PWM mode and internal 500kHz operation. To use external synchronization, disconnect R6 and drive the SYNC pin with a clean CMOS clock signal within the 300kHz–2MHz range. The board does not include series AC-coupling or level-shifting components, so the external source must be compatible with the ISL85410's SYNC input voltage thresholds.

What test equipment is required to properly evaluate the ISL85410EVAL1Z?

Per AN1905 Rev. 4.00, proper evaluation of the ISL85410EVAL1Z requires: a 0–50V/2A DC power supply for VIN, an electronic load capable of sinking up to 2A, a 100MHz quad-trace oscilloscope for ripple/transient analysis, digital multimeters for DC accuracy, and a signal generator if testing SYNC functionality. The board includes dedicated test points (P1–P10) and scope probe pads (J1/J2) to simplify connections without soldering.