Renesas ISL85005AEVAL1Z

Overview

ISL85005AEVAL1Z from Renesas Electronics is an evaluation board for the ISL85005A 4.5V–18V input, 5A synchronous buck regulator IC. It implements a fixed 500kHz switching frequency, forced continuous conduction mode (FCCM), and programmable soft-start via external capacitor on the SS pin. The board supports standard 12V rail supplies and point-of-load conversion to 1.2V–5V outputs in embedded computing and network equipment.

For engineers reviewing the ISL85005AEVAL1Z datasheet, ISL85005AEVAL1Z pinout, ISL85005AEVAL1Z application, or ISL85005AEVAL1Z equivalent, this page provides verified layout guidance, thermal performance data, component selection tables for internal/external compensation, startup timing waveforms, and protection behavior under overcurrent, overvoltage, and thermal fault conditions.

Technical Context

The ISL85005AEVAL1Z implements the full reference design for the ISL85005A IC, including optimized PCB layout with dedicated AGND/PGND separation, thermal vias under the EPAD, and decoupling networks per datasheet recommendations. It uses internal compensation by default (COMP tied to AGND) and supports external loop compensation via COMP–FB network.

It validates key ISL85005A features: 5A output capability with integrated 18V/5A high-side and low-side MOSFETs (R_DS(ON) = 57–95mΩ / 40–75mΩ), ±1% 0.8V feedback reference, power-good (PG) indicator with 1.5ms rising-edge delay, and comprehensive protection including high-side cycle-by-cycle OCP (7.8A typ), low-side reverse OCP (−3.3A), VIN UVLO (4.35V rising), and thermal shutdown (165°C).

Key Specifications

Availability

ISL85005AEVAL1Z is available at Aetrix Electronics and suitable for network infrastructure, battery-powered systems, and embedded computing applications requiring stable component supply and rapid prototyping of high-efficiency 5A buck converters.

Supply support for ISL85005AEVAL1Z 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 manufacturer specializing in microcontrollers, analog power management, and timing solutions for automotive, industrial, and communications markets.

The ISL85005AEVAL1Z belongs to Renesas' high-density power management evaluation platform family, designed to accelerate development of compact, thermally robust point-of-load regulators for space-constrained 12V rail systems.

FAQ

What is the primary purpose of the ISL85005AEVAL1Z?

The ISL85005AEVAL1Z is an evaluation board intended to demonstrate and validate the operation of the ISL85005A 5A synchronous buck regulator IC. It provides a fully assembled, tested reference design with documented layout, component values, and performance curves - enabling engineers to verify voltage regulation, efficiency, transient response, and protection features before integrating the ISL85005A into their own system.

Does the ISL85005AEVAL1Z support both internal and external loop compensation?

Yes, the ISL85005AEVAL1Z supports both compensation modes. By default, it uses internal compensation (COMP pin tied to AGND per Figure 5). External compensation is enabled by removing the COMP–AGND jumper and connecting a custom RC network between COMP and FB - as specified in the "Loop Compensation Design" section (page 19) of the ISL85005A datasheet FN8871.

How is soft-start configured on the ISL85005AEVAL1Z?

The ISL85005AEVAL1Z implements the ISL85005A's programmable soft-start function via the SS pin. A capacitor (CSS) is placed between SS and ground to set the ramp time; the default configuration uses no capacitor, resulting in a 2.3ms soft-start. This limits inrush current during startup and ensures controlled VOUT rise - critical for powering sensitive logic or memory subsystems.

What protection features are validated by the ISL85005AEVAL1Z?

The ISL85005AEVAL1Z validates all core ISL85005A protections: input undervoltage lockout (UVLO), input and output overvoltage protection (OVP), high-side cycle-by-cycle overcurrent protection (7.8A typical), low-side forward/reverse overcurrent protection, and thermal shutdown at 165°C. These are confirmed through test waveforms in Figures 39–41 and transient stress tests described in the datasheet.

Can the ISL85005AEVAL1Z be used to evaluate both ISL85005 and ISL85005A ICs?

No - the ISL85005AEVAL1Z is specifically designed for the ISL85005A variant. It lacks the SYNC/MODE pin functionality required for synchronization and Diode Emulation Mode (DEM), which are exclusive to the ISL85005. For ISL85005 evaluation, Renesas provides the ISL85005EVAL1Z board. Using ISL85005 on ISL85005AEVAL1Z would disable critical features and invalidate timing and protection behavior.