Renesas ISL854102DEMO3Z

Overview

The ISL854102DEMO3Z from Intersil is a demonstration board built around the ISL854102 1.2A synchronous buck regulator, configured in an isolated buck-boost topology to deliver preset ±5V outputs - primary VNEG = –5V and secondary VOUT_SC = +5V - with up to 0.5A per rail at VIN = 24V. It enables rapid evaluation of inverting and non-inverting dual-output power conversion for industrial analog and embedded systems requiring wide-input, compact DC/DC solutions.

For engineers reviewing the ISL854102DEMO3Z datasheet, ISL854102DEMO3Z pinout, ISL854102DEMO3Z application, or ISL854102DEMO3Z equivalent, this board supports output voltage adjustment from 0.6V to 15V, programmable switching frequency (300kHz–2MHz), EN/SYNC/PG functionality, and configurable soft-start and compensation - critical for validating layout, transient response, and system-level integration of the ISL854102 IC.

Technical Context

The ISL854102DEMO3Z implements the ISL854102 IC in a fixed ±5V isolated buck-boost configuration using a coupled inductor (MSD7342-223ML) and discrete feedback network (R1 = 90.9kΩ, R2 = 12.4kΩ). It operates at default 500kHz switching frequency with internal soft-start enabled (R11 = 0Ω) and PWM mode selected via SYNC pin tied to VCC (R9 = 200kΩ).

Key functional blocks include enable control via SW1 toggle switch, power-good monitoring on PG pin, and external synchronization capability. The board supports both FCCM and forced CCM operation modes, with validated performance across input voltages from 3.5V to 35V and load currents up to 500mA per output rail.

Key Specifications

Availability

ISL854102DEMO3Z is available at Aetrix Electronics and suitable for industrial analog power validation, embedded DC/DC design verification, and dual-rail supply prototyping requiring stable component supply and documented reference performance.

Supply support for ISL854102DEMO3Z 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

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management semiconductor company focused on high-performance, energy-efficient power conversion and precision analog solutions.

The ISL854102DEMO3Z belongs to Intersil's Industrial Analog and Power demonstration platform series, designed specifically to accelerate evaluation and adoption of the ISL854102 family of wide-VIN synchronous buck regulators in isolated dual-output applications.

FAQ

What is the primary function of the ISL854102DEMO3Z?

The ISL854102DEMO3Z is a demonstration board that implements the ISL854102 1.2A synchronous buck regulator in an isolated buck-boost configuration to generate dual outputs: –5V (primary) and +5V (secondary). It is not a standalone IC but a fully assembled, tested PCB used to validate performance, layout, and system integration of the ISL854102 IC under real-world conditions.

Can the output voltages of the ISL854102DEMO3Z be changed from ±5V?

Yes, the ISL854102DEMO3Z outputs are preset to ±5V but can be adjusted from 0.6V to 15V using the feedback resistor divider (R1 and R2). For example, changing R2 to 4.75kΩ sets VOUT_SC to 12V when R1 remains 90.9kΩ. The ISL854102DEMO3Z User's Manual (UG137) provides full component selection tables and Equation 1 for recalculating R2 based on desired output voltage.

What is the default switching frequency of the ISL854102DEMO3Z and how is it modified?

The ISL854102DEMO3Z operates at a default switching frequency of 500kHz, set by tying the FS pin to VCC via R13 (0Ω). To change frequency, R13 is removed and R14 is installed: 340kΩ yields 300kHz, 32.4kΩ yields 2MHz. The ISL854102DEMO3Z schematic and UG137 specify exact resistor values and warn against leaving the FS pin floating.

Does the ISL854102DEMO3Z support external synchronization?

Yes, the ISL854102DEMO3Z includes a SYNC pin accessible via test point J2. By default, it is configured for internal PWM operation (R9 = 200kΩ to VCC), but removing R9 allows injection of an external clock signal to synchronize the ISL854102 switching frequency - essential for noise-sensitive or multi-rail systems requiring deterministic timing alignment.

How is enable/disable functionality implemented on the ISL854102DEMO3Z?

The ISL854102DEMO3Z uses a physical SPDT toggle switch (SW1) to assert or deassert the EN pin of the ISL854102 IC. When SW1 is ON, EN is pulled high and the converter operates; when OFF, EN is low and the device enters low-quiescent-current shutdown. This provides immediate, hardware-level control over power delivery without requiring external logic signals.