Renesas ISL854102EVAL1Z

Overview

ISL854102EVAL1Z from Renesas Electronics is an evaluation board designed to characterize the ISL854102 40V, 1.2A synchronous buck regulator in point-of-load applications. It supports input voltages from 3V to 40V, delivers a preset 3.3V output (adjustable from 0.6V to 15V), and operates at a default 500kHz switching frequency with peak efficiency >84% at 50% load and output ripple <3mV at 1.2A.

For engineers reviewing the ISL854102EVAL1Z datasheet, ISL854102EVAL1Z pinout, ISL854102EVAL1Z application, or ISL854102EVAL1Z equivalent, this board enables rapid validation of wide-VIN DC/DC performance under real-world dynamic load steps (0A ↔ 1.2A, di/dt = 1A/μs), PFM/PWM mode selection, soft-start configuration, and SYNC functionality - all using minimal external components on a compact 1.516cm² layout.

Technical Context

The ISL854102EVAL1Z implements the ISL854102 IC in a fully assembled, tested 12-lead DFN (4mm × 3mm) reference design. It integrates internal high-side and low-side NMOS FETs, supports selectable PFM or forced PWM operation at light loads, and provides configurable switching frequency (300kHz–2MHz) via the FS pin using external resistor R12.

Board-level features include power-good (PG) monitoring with open-drain output, enable (EN) control via S1 toggle switch, SYNC input for external clock synchronization, and dual-mode soft-start (internal or external via CSS). The design uses a 22µH power inductor and optimized input/output capacitance (C1/C2 = 10µF each, C5+C6 = 69µF total) to meet ripple and transient response targets.

Key Specifications

Availability

ISL854102EVAL1Z is available at Aetrix Electronics and suitable for industrial power management, embedded system prototyping, and automotive subsystem evaluation requiring stable component supply, traceable sourcing, and long-term design-in support.

Supply support for ISL854102EVAL1Z 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 industrial, automotive, and infrastructure markets.

The ISL854102EVAL1Z belongs to Renesas' ISL854xx evaluation platform family, engineered to accelerate adoption of high-efficiency, wide-input-voltage buck regulators targeting space-constrained point-of-load applications.

FAQ

What is the primary function of the ISL854102EVAL1Z?

The ISL854102EVAL1Z is a fully assembled evaluation board for the ISL854102 40V, 1.2A synchronous buck regulator. Its purpose is to enable engineers to validate key performance metrics-including efficiency, transient response, PFM/PWM behavior, and output voltage adjustability-under real operating conditions without designing custom hardware. The ISL854102EVAL1Z simplifies characterization of the ISL854102 IC across its full input range (3V–40V) and load capability (up to 1.2A).

Can the output voltage of the ISL854102EVAL1Z be changed from the default 3.3V?

Yes, the ISL854102EVAL1Z output voltage is adjustable from 0.6V to 15V using the external feedback resistors R1 (90.9kΩ) and R2 (20kΩ for 3.3V). Equation 1 in the user guide defines the relationship: V_OUT = 0.6 × (1 + R2/R1). For outputs below 1.8V, the switching frequency must be reduced to 300kHz due to minimum on-time limitations - a change implemented by modifying R12 per the ISL854102 datasheet. The ISL854102EVAL1Z supports this reconfiguration without PCB modification.

How does the ISL854102EVAL1Z support different operating modes like PFM and PWM?

The ISL854102EVAL1Z uses S2 toggle switch and R6 (200kΩ to VCC) to select between PFM and forced PWM modes. When S2 connects SYNC to GND, the ISL854102 enters PFM mode for ultra-low quiescent current at light loads. When S2 connects SYNC to VCC (default), it operates in forced PWM mode for consistent frequency and lower noise. This dual-mode capability is directly accessible on the ISL854102EVAL1Z without soldering or jumper changes.

What test equipment is required to evaluate the ISL854102EVAL1Z?

To fully evaluate the ISL854102EVAL1Z, Renesas recommends a 0–50V/2A DC power supply, electronic load capable of sinking up to 2A, 100MHz quad-trace oscilloscope, digital multimeters, and signal generator. These tools allow measurement of efficiency curves, output ripple, dynamic response (0A ↔ 1.2A steps), and startup timing - all critical parameters documented in the ISL854102EVAL1Z User's Manual AN1905. The board includes dedicated test points (P1–P10) for direct probe access to VIN, VOUT, PG, EN, SYNC, and SW nodes.

Does the ISL854102EVAL1Z include thermal management provisions?

Yes, the ISL854102EVAL1Z PCB design incorporates thermal best practices: the ISL854102FRZ IC is mounted on a 4-layer board with an exposed thermal pad connected to an internal ground plane via eight vias, as specified in the schematic and layout documentation. This ensures effective heat dissipation during sustained 1.2A operation at elevated input voltages (e.g., 24V or 36V), maintaining junction temperature within safe limits per the ISL854102 datasheet. No external heatsink is required for standard lab evaluation.