Renesas ISL85003AEVAL2Z

Overview

ISL85003AEVAL2Z from Renesas Electronics is an evaluation board designed to demonstrate the performance of the ISL85003A synchronous buck regulator in point-of-load applications. It supports 4.5V–18V input, delivers up to 3A at resistor-programmable output voltages (e.g., 0.8V–5V ±1%), and features current-mode control with DCM/CCM operation, 500kHz fixed switching frequency, and adjustable soft-start.

For engineers reviewing the ISL85003AEVAL2Z datasheet, ISL85003AEVAL2Z pinout, ISL85003AEVAL2Z application, or ISL85003AEVAL2Z equivalent, this board enables rapid validation of ISL85003A-based power designs-especially for industrial embedded systems requiring stable 3A POL regulation, low-quiescent-current operation, and flexible compensation and mode control.

Technical Context

The ISL85003AEVAL2Z implements the ISL85003A IC in a fully assembled, test-ready configuration with dual flat no-lead (DFN) footprint and pre-populated 4.7µH power inductor, 10µF/22µF/47µF ceramic output capacitors, and 301kΩ/57.6kΩ feedback resistors preset for 5V output. It supports both internal and external compensation via COMP pin access and provides switch-selectable EN and MODE (DCM/PWM) functionality.

Board-level features include VIN and VOUT test points (P4/P5/P8/P9), SYNC input (P2), PG output (P1), and on-board LED status indicator. The design operates across –40°C to +125°C junction temperature range and uses the ISL85003AFRZ regulator in a 12-pin 4×3mm DFN package with exposed thermal pad.

Key Specifications

Availability

ISL85003AEVAL2Z is available at Aetrix Electronics and suitable for industrial embedded systems, point-of-load DC/DC conversion, and power management validation requiring stable component supply, quick-turn prototyping, and production-ready reference design fidelity.

Supply support for ISL85003AEVAL2Z 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 ISL85003AEVAL2Z belongs to Renesas' high-efficiency, low-I_Q buck regulator evaluation platform family, engineered specifically to accelerate adoption of ISL85003/ISL85003A regulators in space-constrained, thermally demanding point-of-load applications.

FAQ

What is the primary function of the ISL85003AEVAL2Z?

The ISL85003AEVAL2Z is an evaluation board that demonstrates the electrical performance and layout implementation of the ISL85003A synchronous buck regulator. It allows engineers to validate key parameters-including efficiency, transient response, thermal behavior, and mode switching-under real-world conditions before integrating the ISL85003A into their final design. The board includes all necessary passive components, test points, and user controls to expedite development.

Does the ISL85003AEVAL2Z support both ISL85003 and ISL85003A ICs?

Yes-the ISL85003AEVAL2Z board is shared with ISL85003EVAL2Z and supports both ISL85003FRZ and ISL85003AFRZ regulators. While both variants share identical pinout and core topology, the ISL85003AEVAL2Z specifically enables evaluation of the ISL85003A's unique features, including adjustable soft-start timing and enhanced light-load efficiency characteristics not present in the base ISL85003.

How is output voltage set on the ISL85003AEVAL2Z?

Output voltage on the ISL85003AEVAL2Z is set using an external resistor divider network connected to the FB pin of the ISL85003A. By default, R1 = 301kΩ and R2 = 57.6kΩ configure a 5V output per the formula V_OUT = 0.8V × (1 + R2/R1). For other voltages (e.g., 0.8V, 1.2V, 3.3V), users replace R2 per Table 1 in AN1930, while retaining R1 to maintain loop stability with internal compensation.

What are the key user controls on the ISL85003AEVAL2Z board?

The ISL85003AEVAL2Z includes two toggle switches: SW1 controls EN (ON/OFF) to enable or disable the regulator output, and SW2 selects operating mode-DCM (forced discontinuous conduction) or PWM (fixed-frequency forced continuous conduction). These controls allow direct observation of efficiency trade-offs, ripple behavior, and light-load regulation characteristics without modifying firmware or external circuitry.

Can the ISL85003AEVAL2Z be synchronized to an external clock?

No-the ISL85003AEVAL2Z board does not implement external synchronization capability. Although the underlying ISL85003A IC supports SYNC input (pin 1), the evaluation board schematic shows the SYNC pin (U1 pin 13) unconnected and no header or routing provided for external clock injection. Synchronization functionality requires custom modification or use of the ISL85003EVAL2Z variant, which explicitly lists "external synchronization up to 2MHz" in its documentation.