Renesas ISL85033CRSHEVAL1Z

Overview

ISL85033CRSHEVAL1Z from Renesas Electronics is an evaluation board for the ISL85033 dual 3A synchronous buck regulator IC, supporting input voltage range 4.5V–28V and independent or current-sharing 3A/3A or 6A output configurations. It implements peak current-mode control, 300kHz–2MHz programmable switching frequency, and features soft-start, power-good monitoring, and thermal/overcurrent protection. The board enables rapid validation of point-of-load power designs for FPGA, LCD panels, and set-top boxes.

For engineers reviewing the ISL85033CRSHEVAL1Z datasheet, ISL85033CRSHEVAL1Z pinout, ISL85033CRSHEVAL1Z application, or ISL85033CRSHEVAL1Z equivalent, this evaluation platform supports functional verification of dual-output DC/DC conversion, output tracking (in-phase/out-of-phase), synchronization, and load transient response under real-world thermal and layout conditions.

Technical Context

The ISL85033CRSHEVAL1Z implements the full reference design for the ISL85033 dual buck controller, including external Schottky diodes (B340B), 7µH inductors, 47µF/20µF output capacitors, and 10nF soft-start timing caps. It supports both independent regulation (5V/3.3V) and current-sharing (6A at 5V) topologies per Figure 2 and Figure 3 of FN6676 Rev.8.02.

Board-level features include SYNCIN/SYNCOUT headers for external clock injection or daisy-chaining, EN1/EN2 jumpers for enable sequencing, SS1/SS2 test points for soft-start adjustment, and PGOOD1/PGOOD2 LEDs with open-drain outputs. All critical power paths use wide copper pours connected to the exposed thermal pad (PD) via multiple vias.

Key Specifications

Availability

ISL85033CRSHEVAL1Z is available at Aetrix Electronics and suitable for FPGA power delivery, LCD panel biasing, and set-top box DC/DC conversion requiring stable component supply, fast prototyping turnaround, and production-ready reference design validation.

Supply support for ISL85033CRSHEVAL1Z 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 high-performance analog, power, and embedded processing solutions for automotive, industrial, and infrastructure markets.

The ISL85033 product line delivers highly integrated dual buck regulators optimized for compact, efficient point-of-load power in space-constrained applications such as STBs, DVD drives, and FPGA auxiliary rails.

FAQ

What is the primary function of the ISL85033CRSHEVAL1Z evaluation board?

The ISL85033CRSHEVAL1Z evaluation board is a fully assembled and tested hardware platform designed to demonstrate and validate the ISL85033 dual 3A buck regulator IC. It enables engineers to evaluate key performance metrics-including efficiency, load transient response, soft-start behavior, output tracking, and synchronization-under real operating conditions using standard lab equipment and minimal setup.

Does the ISL85033CRSHEVAL1Z support both independent and current-sharing output modes?

Yes, the ISL85033CRSHEVAL1Z supports both configurations. Independent operation (3A per channel) uses separate inductors and diodes per channel as shown in Figure 2 of FN6676. Current sharing (6A total) is implemented per Figure 3, where PHASE1 and PHASE2 are paralleled with matched components and synchronized out-of-phase to reduce input/output ripple. Jumper settings and component population determine the mode.

How is switching frequency configured on the ISL85033CRSHEVAL1Z?

Switching frequency on the ISL85033CRSHEVAL1Z is configured via the FS pin of the ISL85033 IC. By default, tying FS to VCC sets 500kHz. For adjustable frequency (300kHz–2MHz), a resistor is connected from FS to GND per the formula in FN6676. Alternatively, an external clock can be applied to SYNCIN (negative-edge triggered), enabling synchronization across multiple ISL85033CRSHEVAL1Z boards or with system clocks.

What protection features of the ISL85033 are verified on the ISL85033CRSHEVAL1Z board?

The ISL85033CRSHEVAL1Z validates all core protection features of the ISL85033 IC: overcurrent protection (OCP) with hiccup-mode recovery, thermal shutdown at +150°C with 20°C hysteresis, input undervoltage lockout (UVLO) with POR thresholds at 3.9V (rising) and 3.2V (falling), BOOT undervoltage detection, and soft-discharge shutdown. These are observable via oscilloscope waveforms and LED indicators during fault testing.

Can the ISL85033CRSHEVAL1Z be used to evaluate output voltage sequencing and tracking?

Yes, the ISL85033CRSHEVAL1Z fully supports all four sequencing/tracking modes specified for the ISL85033: independent, sequential, ratiometric, and absolute. These are controlled by applying appropriate logic levels to EN1/EN2 and configuring SS1/SS2 capacitor values. Test points for SS1, SS2, EN1, EN2, and PGOOD signals allow direct probing and validation of ramp timing, delay intervals, and voltage correlation between outputs.