Renesas ISL8105BEVAL2Z

Overview

ISL8105BEVAL2Z from Renesas Electronics is an evaluation board for the ISL8105BIRZ synchronous buck PWM controller, configured for 1.8V/15A DC/DC conversion with 90% efficiency at 12V input. It implements a complete voltage-mode buck regulator using Infineon BSC080N03LS (high-side) and BSC030N03LS (low-side) MOSFETs, 1µH output inductor, and 1560µF low-ESR output capacitance.

For engineers reviewing the ISL8105BEVAL2Z datasheet, ISL8105BEVAL2Z pinout, ISL8105BEVAL2Z application, or ISL8105BEVAL2Z equivalent, this board supports rapid validation of single-phase synchronous buck designs targeting FPGA core power, ASIC point-of-load regulation, and industrial embedded processor supplies requiring tight transient response and soft-start with pre-biased output capability.

Technical Context

The ISL8105BEVAL2Z implements a voltage-mode controlled synchronous buck converter using the ISL8105BIRZ in 10-lead DFN package. It operates with 9.6–14.4V input, delivers 1.8V ±10mV output at up to 15A continuous load, and achieves ≤30mV_P-P output ripple via four 470µF organic aluminum capacitors (2.5V rating) and optimized Type-III compensation.

Board-level features include jumper-selectable bias supply (5V or 12V), push-button enable/disable (SW1), overcurrent protection set to 21A (12V bias) using R_BSOC = 1.74kΩ, and test points (TP3, TP6, TPVO1) for output voltage monitoring and oscilloscope probing.

Key Specifications

Availability

ISL8105BEVAL2Z is available at Aetrix Electronics and suitable for FPGA core power delivery, ASIC point-of-load regulation, and industrial embedded processor supply applications requiring stable component supply, fast design validation, and production-ready reference schematics.

Supply support for ISL8105BEVAL2Z 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 Corporation is a global semiconductor manufacturer headquartered in Japan, delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and enterprise applications.

The ISL8105B product line provides single-phase synchronous buck PWM controllers with integrated gate drivers and linear regulators, designed specifically for high-efficiency, space-constrained point-of-load DC/DC conversion in computing and communications infrastructure.

FAQ

What is the primary function of the ISL8105BEVAL2Z evaluation board?

The ISL8105BEVAL2Z evaluation board demonstrates the operation of the ISL8105BIRZ synchronous buck PWM controller in a fully assembled 1.8V/15A DC/DC converter. It enables engineers to validate voltage-mode control loop stability, transient response, efficiency, and protection features-including soft-start with pre-biased output-without designing a custom PCB. The board uses verified component values and layout practices directly from Renesas Application Note AN1288.

Which controller IC is mounted on the ISL8105BEVAL2Z board?

The ISL8105BEVAL2Z board mounts the ISL8105BIRZ, a 10-lead DFN packaged synchronous buck PWM controller from Renesas Electronics. This variant differs from the SOIC-packaged ISL8105BIBZ used on the ISL8105BEVAL1Z board. The ISL8105BIRZ integrates boot diode, linear regulator, and dual N-channel gate drivers, enabling minimal external component count for compact point-of-load designs.

How does the ISL8105BEVAL2Z handle overcurrent protection?

The ISL8105BEVAL2Z implements cycle-by-cycle overcurrent protection using the low-side MOSFET's r_DS(ON) as a current-sense element. A 1.74kΩ resistor (R_BSOC) sets the trip threshold to 21A when powered from a 12V bias supply. Upon detection, the controller shuts down output and enters hiccup mode-executing two dummy soft-start timeouts followed by one real soft-start attempt-until the fault condition clears.

Can the ISL8105BEVAL2Z be used with a 5V bias supply instead of 12V?

Yes, the ISL8105BEVAL2Z supports both 5V and 12V bias supplies via jumper J7 configuration. When using 5V bias, the overcurrent trip level reduces to 17A (per AN1288), and the controller maintains full functionality including soft-start, feedback regulation, and transient response. Input voltage range remains 9.6–14.4V for the main converter stage, independent of bias selection.

What are the key differences between ISL8105BEVAL1Z and ISL8105BEVAL2Z?

The ISL8105BEVAL1Z uses the ISL8105BIBZ in 8-lead SOIC package and shares identical electrical performance (1.8V/15A, 90% efficiency, 30mV ripple), while the ISL8105BEVAL2Z uses the ISL8105BIRZ in 10-lead DFN package. Layout, component placement, and thermal pad implementation differ to accommodate the DFN footprint, but both boards implement the same Type-III compensation network, MOSFET selection (BSC080N03LS/BSC030N03LS), and bill-of-materials structure per AN1288 Rev 1.00.