Renesas ISL85033EVAL2Z

Overview

ISL85033EVAL2Z from Renesas Electronics is an evaluation board for the ISL85033 dual synchronous buck regulator IC, designed to demonstrate 3A/3A output capability across 4.5V–28V input range with factory-configured 5V and 3.3V outputs. It supports out-of-phase PWM operation to reduce input ripple, features internal 2ms soft-start, and includes independent power-good signals per channel.

For engineers reviewing the ISL85033EVAL2Z datasheet, ISL85033EVAL2Z pinout, ISL85033EVAL2Z application, or ISL85033EVAL2Z equivalent, this board enables rapid validation of wide-VIN POL designs, switching frequency optimization (500kHz default), output voltage reconfiguration via feedback resistors, and thermal/overcurrent protection behavior under real load conditions.

Technical Context

The ISL85033EVAL2Z implements the ISL85033 controller in a fully assembled, tested configuration using two 7µH shielded inductors, B340B Schottky diodes, and low-ESR ceramic output capacitors. Input voltage is applied across VIN1/VIN2 terminals, with GND2 serving as main return path.

Switching frequency is fixed at 500kHz via FS pin tied to VCC; SYNCIN is pulled to GND by R8 (0Ω) for internal clock operation. Output voltages are set by resistor dividers (R2/R3 for VOUT1=5V; R12/R10 for VOUT2=3.3V), referencing the 0.8V internal FB threshold.

Key Specifications

Availability

ISL85033EVAL2Z is available at Aetrix Electronics and suitable for power supply design validation, POL converter prototyping, and dual-rail embedded system development requiring stable component supply and documented reference performance.

Supply support for ISL85033EVAL2Z 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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, infrastructure, and IoT applications.

The ISL85033EVAL2Z belongs to Renesas' high-efficiency DC/DC evaluation platform family, developed specifically to accelerate adoption of wide-input-voltage dual buck regulators in space-constrained, multi-rail power systems.

FAQ

What is the primary function of the ISL85033EVAL2Z?

The ISL85033EVAL2Z is an evaluation board that demonstrates the performance of the ISL85033 dual synchronous buck regulator IC. It provides a ready-to-use platform for validating 5V/3.3V dual-output power delivery, testing protection features, and evaluating layout practices. The ISL85033EVAL2Z does not replace the ISL85033 IC but serves as its reference implementation.

Can the ISL85033EVAL2Z be used to generate output voltages other than 5V and 3.3V?

Yes - the ISL85033EVAL2Z supports reconfiguration of both outputs via feedback resistor networks. VOUT1 and VOUT2 are set by R2/R3 and R12/R10 respectively, using the formula R_top = R_bottom × (V_OUT/0.8 − 1). The ISL85033EVAL2Z schematic shows DNP positions for alternate resistor values, enabling custom voltages including 1.8V or 9V, subject to minimum on-time constraints at lower frequencies.

How is switching frequency controlled on the ISL85033EVAL2Z?

Switching frequency on the ISL85033EVAL2Z is set to 500kHz by default, with the FS pin tied to VCC. To change frequency, remove the jumper or zero-ohm resistor connecting FS to VCC and apply an external voltage (0.8V–2.0V) per the ISL85033 datasheet. The ISL85033EVAL2Z also supports external synchronization via SYNCIN (R8 removed), accepting 600kHz–4MHz clocks.

Does the ISL85033EVAL2Z support parallel operation of its two channels?

Yes - the ISL85033EVAL2Z hardware supports paralleling VOUT1 and VOUT2 to deliver up to 6A at a single output voltage, provided both channels are configured identically and share current-sense feedback. The ISL85033 IC itself enables phase interleaving (out-of-phase operation by default), which reduces input capacitor RMS current and eases thermal design when operating in parallel mode.

What protection features are implemented and verified on the ISL85033EVAL2Z?

The ISL85033EVAL2Z validates all protection functions of the ISL85033 IC: overcurrent protection with hiccup-mode recovery, thermal overload shutdown, input UVLO (4.2V typical), and boot undervoltage lockout. These are observable via PGOOD1/PGOOD2 status pins and confirmed in AN1585 test data. The ISL85033EVAL2Z layout includes thermal vias and copper pours to support reliable thermal protection activation.