Renesas ISL78233EVAL2Z

Overview

ISL78233EVAL2Z from Renesas (formerly Intersil) is an evaluation board designed to demonstrate the ISL78233 3A synchronous buck regulator in automotive point-of-load applications. It supports 2.7V–5.5V input, delivers 1.8V default output (adjustable 0.8V–3.3V), operates at 2MHz default switching frequency, and features PFM/PWM mode selection via onboard toggle switch.

For engineers reviewing the ISL78233EVAL2Z datasheet, ISL78233EVAL2Z pinout, ISL78233EVAL2Z application, or ISL78233EVAL2Z equivalent, this board enables rapid validation of transient response, efficiency, thermal behavior, and fault protection under real automotive load conditions with minimal external setup.

Technical Context

The ISL78233EVAL2Z implements a complete reference design for the ISL78233 - a low-quiescent-current, AEC-Q100 qualified synchronous buck regulator in 5×5mm WFQFN-16. It integrates internal compensation (COMP tied to VDD), 1ms default soft-start (configurable via C6), and robust protection including overcurrent, overtemperature, overvoltage, and negative overcurrent detection.

Board-level features include a 0.68µH Vishay IHLP inductor rated for 13.5A saturation, four 47µF Taiyo Yuden ceramic output capacitors, dual test-point headers (J1/J2), SPDT toggle switches (SW1/SW2) for EN and SYNC control, and a 33nF soft-start capacitor yielding ~10ms ramp time.

Key Specifications

Availability

ISL78233EVAL2Z is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, infotainment power rails, and body electronics requiring stable component supply, fast prototyping cycles, and AEC-Q100-compliant reference validation.

Supply support for ISL78233EVAL2Z 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 (acquired Intersil in 2017) is a global semiconductor leader specializing in microcontrollers, analog, power management, and automotive SoCs.

The ISL78233EVAL2Z belongs to Renesas' automotive-grade power management evaluation platform family, engineered specifically to accelerate design-in of high-efficiency, low-I_Q buck regulators for demanding 12V automotive systems.

FAQ

What is the primary function of the ISL78233EVAL2Z?

The ISL78233EVAL2Z is an evaluation board - not an IC - used to characterize and validate the ISL78233 3A synchronous buck regulator. It provides a fully assembled, tested PCB with all necessary passive components, test points, and control switches to evaluate efficiency, transient response, thermal performance, and protection features under realistic automotive operating conditions.

Does the ISL78233EVAL2Z support adjustable output voltage?

Yes. The ISL78233EVAL2Z defaults to 1.8V output but supports adjustment from 0.8V to 3.3V using the feedback resistor divider (R2/R3). R2 value is calculated per Equation 1 in UG062, with R3 fixed at 100kΩ. Adding 10–22pF in parallel to R2 improves transient response, subject to loop compensation verification.

How is switching frequency configured on the ISL78233EVAL2Z?

The ISL78233EVAL2Z defaults to 2MHz operation (FS pin tied to VIN via R6 = 0Ω). To change frequency, remove R6 and replace R4 with a value calculated using Equation 2 (UG062): R4 [kΩ] = (220 × 10³ / f_OSC[kHz]) − 14. This enables tuning from 500kHz to 4MHz for trade-offs between efficiency, EMI, and component size.

What protection features can be validated using the ISL78233EVAL2Z?

The ISL78233EVAL2Z enables validation of overtemperature, overcurrent, overvoltage, and negative overcurrent protection - all implemented in the underlying ISL78233 IC. These protections are active during normal operation and fault testing, and their behavior (e.g., shutdown timing, restart logic) can be observed at test points and monitored via oscilloscope on PHASE, FB, and PG pins.

Is the ISL78233EVAL2Z compatible with other ISL7823x evaluation boards?

Yes - the ISL78233EVAL2Z shares identical PCB layout, component placement, and schematic topology with ISL78234EVAL2Z and ISL78235EVAL2Z (per UG062 Figure 4 note). Only the U1 IC differs (ISL78233AARZ vs. ISL78234AARZ/ISL78235AARZ), enabling direct comparison of 3A/4A/5A variants using the same board footprint and test infrastructure.