Renesas ISL85033DUALEVAL1Z

Overview

The ISL85033DUALEVAL1Z from Renesas Electronics is an evaluation board designed to demonstrate the ISL85033 wide-input dual buck regulator IC, delivering 3A/3A output current with preset 5V and 3.3V outputs. It supports 4.5V–28V input, operates at 500kHz default switching frequency, and enables in-phase or out-of-phase PWM control for point-of-load power conversion in industrial and embedded systems.

For engineers reviewing the ISL85033DUALEVAL1Z datasheet, ISL85033DUALEVAL1Z pinout, ISL85033DUALEVAL1Z application, or ISL85033DUALEVAL1Z equivalent, this board provides hands-on validation of dual-channel sequencing, independent power-good signaling, soft-start behavior, and external synchronization capability - all critical for multi-rail DC/DC design verification.

Technical Context

The ISL85033DUALEVAL1Z implements the ISL85033IRTZ dual synchronous buck controller in a fully assembled 4mm×4mm TQFN-28 evaluation platform. It features independent EN1/EN2 enable inputs, FS pin for 300kHz–2MHz frequency selection, and SI pin for external synchronization up to 4MHz.

Each channel includes dedicated SS1/SS2 pins for programmable soft-start, COMP1/COMP2 compensation networks, and PGOOD1/PGOOD2 open-drain status outputs. Output voltages are preset to 5V (VOUT1) and 3.3V (VOUT2) via feedback resistors R3/R2 and R14/R16, adjustable down to 0.8V using Equation 1 from AN1574.

Key Specifications

Availability

ISL85033DUALEVAL1Z is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and telecom power subsystem development requiring stable component supply, rapid prototyping validation, and multi-rail DC/DC performance characterization.

Supply support for ISL85033DUALEVAL1Z 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 specializing in microcontrollers, analog power management, and timing solutions for industrial, automotive, and infrastructure applications.

The ISL85033DUALEVAL1Z belongs to Renesas' high-efficiency wide-VIN buck regulator evaluation platform family, engineered to accelerate adoption of dual-output point-of-load converters in space-constrained, high-reliability systems.

FAQ

What is the primary function of the ISL85033DUALEVAL1Z?

The ISL85033DUALEVAL1Z is an evaluation board that demonstrates the ISL85033IRTZ dual 3A synchronous buck regulator. It provides a ready-to-test platform with preset 5V and 3.3V outputs, enabling engineers to validate performance metrics including efficiency, transient response, sequencing behavior, and protection features before integrating the ISL85033 into final designs.

Can the output voltages on the ISL85033DUALEVAL1Z be adjusted?

Yes - the ISL85033DUALEVAL1Z supports adjustable output voltages from 0.8V to 5V per channel using external feedback resistors. VOUT1 is set by R3 and R2; VOUT2 by R14 and R16. Shorting R3 or R14 sets the output to 0.8V. For outputs below 2.5V, switching frequency and compensation must be modified per FN6676 to meet minimum on-time requirements.

How does the ISL85033DUALEVAL1Z handle power sequencing between its two outputs?

The ISL85033DUALEVAL1Z supports four sequencing modes - independent, sequential, ratiometric, and absolute - controlled by EN1/EN2 logic states and internal configuration. Table 2 in AN1574 defines behavior: e.g., EN1=High/EN2=Floating sequences VOUT1 first; EN1=EN2=High enables simultaneous startup. This flexibility allows precise rail ordering for FPGA, processor, or ASIC power domains.

What external equipment is required to evaluate the ISL85033DUALEVAL1Z?

Evaluating the ISL85033DUALEVAL1Z requires a 0–30V/7A power supply, electronic loads capable of sinking up to 7A total, digital multimeters, a 100MHz quad-trace oscilloscope, and a signal generator for sync testing. Test points JLX1/JLX2 (input), JVO1/JVO2 (outputs), and mini test points for EN, FS, SI, and PGOOD signals simplify probing and control.

Does the ISL85033DUALEVAL1Z support external clock synchronization?

Yes - the ISL85033DUALEVAL1Z includes an SI (SYNCIN) pin tied to ground via R18 (0Ω) by default, enabling internal 500kHz operation. Removing R18 allows connection of an external clock source from 600kHz to 4MHz, supporting EMI reduction and deterministic timing in synchronized multi-board systems. The pin must never be left floating.