Renesas ISL854102DEMO1Z

Overview

ISL854102DEMO1Z from Renesas Electronics is an evaluation board designed to characterize the ISL854102 40V input, 1.2A synchronous buck regulator in point-of-load applications. It supports input voltages from 3V to 40V, delivers a preset 3.3V output, operates at 500kHz default switching frequency, achieves >84% peak efficiency at 50% load, and maintains <3mV output ripple at full 1.2A current.

For engineers reviewing the ISL854102DEMO1Z datasheet, ISL854102DEMO1Z pinout, ISL854102DEMO1Z application, or ISL854102DEMO1Z equivalent, this board enables rapid validation of transient response (4.5% deviation under 0A↔1.2A steps), PFM/PWM mode selection, SYNC capability, soft-start configuration, and output voltage reprogramming from 0.6V to 15V.

Technical Context

The ISL854102DEMO1Z implements the ISL854102 IC in a fully assembled, tested layout optimized for thermal performance and EMI control. It integrates the 4mm×3mm 12-lead DFN-packaged controller with on-board 22µH power inductor, 69µF total output capacitance (47µF + 22µF), and precision feedback network (R1 = 90.9kΩ, R2 = 20kΩ) for 3.3V regulation.

Board-level features include jumper-selectable EN/SYNC/SS modes, FS pin resistor options (0Ω for 500kHz, 340kΩ for 300kHz, 32.4kΩ for 2MHz), open-drain PG signal with 1.1V/0.9V thresholds, and provision for external soft-start or compensation via R15/CSS and R11/COMP pads.

Key Specifications

Availability

ISL854102DEMO1Z is available at Aetrix Electronics and suitable for industrial power supply validation, embedded system PoL testing, and automotive subsystem prototyping requiring stable component supply and documented reference design implementation.

Supply support for ISL854102DEMO1Z 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, infrastructure, and IoT applications.

The ISL854102DEMO1Z belongs to Renesas' high-voltage buck regulator evaluation platform family, engineered to accelerate adoption of wide-VIN, low-I_Q DC/DC converters in space-constrained, thermally demanding point-of-load systems.

FAQ

What is the primary function of the ISL854102DEMO1Z evaluation board?

The ISL854102DEMO1Z evaluation board is a fully assembled hardware platform designed to demonstrate and validate the electrical performance of the ISL854102 40V, 1.2A synchronous buck regulator. It provides immediate access to key signals-including EN, SYNC, PG, SS, and FS-for functional verification, efficiency measurement, transient testing, and output voltage customization without requiring custom PCB design. The board ships configured for 3.3V/1.2A operation at 500kHz.

Can the ISL854102DEMO1Z be used to evaluate output voltages other than 3.3V?

Yes, the ISL854102DEMO1Z supports output voltage adjustment from 0.6V to 15V by modifying the R1/R2 feedback resistor network per Equation 1 in the AN1905 User's Manual. For example, changing R2 from 20kΩ to 4.75kΩ sets V_OUT = 12V. Note that outputs below 1.8V require switching frequency reduction to 300kHz to accommodate minimum on-time constraints-achieved by replacing R10 (0Ω) with a 340kΩ resistor on the FS pin.

How does the ISL854102DEMO1Z support both PFM and forced PWM operation modes?

The ISL854102DEMO1Z uses S2 toggle switch and R6 (200kΩ to VCC) to select between PFM and forced PWM modes. With S2 in the "PFM" position and SYNC tied to GND, the ISL854102 enters discontinuous conduction mode for ultra-low I_Q at light loads. With S2 in the "PWM" position and SYNC pulled to VCC via R6, the regulator maintains fixed-frequency operation across all load conditions - essential for noise-sensitive applications and predictable EMI filtering.

What thermal and layout features are implemented on the ISL854102DEMO1Z to ensure reliable high-current operation?

The ISL854102DEMO1Z incorporates an 8-via thermal pad connection from the ISL854102FRZ DFN package to the internal ground plane, a 22µH DR73-series shielded power inductor rated for 1.62A saturation current, and low-ESR ceramic output capacitors (47µF + 22µF). The compact 1.516cm² converter area minimizes parasitic inductance, while the four-layer board stack-up (including dedicated PGND and power planes) ensures stable 1.2A continuous current delivery and <3mV ripple under full load.

Is the ISL854102DEMO1Z compatible with external clock synchronization?

Yes, the ISL854102DEMO1Z provides direct access to the SYNC pin (U1 Pin 2) via test point P2 and onboard R6/R7 network. When R6 is installed (200kΩ to VCC), the board defaults to internal oscillator operation. Removing R6 and applying an external 300kHz–2MHz clock signal to P2 synchronizes the ISL854102's switching frequency - enabling noise reduction in multi-rail systems and EMI compliance testing. The board schematic confirms SYNC pin functionality is preserved and electrically isolated per the ISL854102FRZ datasheet requirements.