Renesas ISL9104IRUAEVAL1Z

Overview

ISL9104IRUAEVAL1Z from Renesas Electronics is an evaluation board designed to test the ISL9104IRUAZ-T adjustable-output buck regulator, delivering up to 500mA at 0.8V–VIN with 4.3MHz switching frequency and low quiescent current. It features on-board feedback resistors (R1 = R2 = 100kΩ) presetting VOUT to 1.6V, JP1 enable/disable jumper, and input/output connectors for rapid prototyping of power management circuits in portable electronics.

For engineers reviewing the ISL9104IRUAEVAL1Z datasheet, ISL9104IRUAEVAL1Z pinout, ISL9104IRUAEVAL1Z application, or ISL9104IRUAEVAL1Z equivalent, this board enables fast validation of ISL9104-based DC-DC designs under real load conditions (0–500mA), input voltage range (2.7V to 6.0V), thermal performance, and transient response-critical for space-constrained, battery-powered systems requiring high efficiency at light loads.

Technical Context

The ISL9104IRUAEVAL1Z implements a complete reference design for the ISL9104IRUAZ-T, a 4.3MHz synchronous step-down regulator using a P-channel high-side MOSFET and integrated control loop. It supports adjustable output via external resistor divider (FB pin), with default configuration yielding 1.6V (VOUT = 0.8V × (1 + R2/R1)).

Input is routed through VIN/GND headers; output is accessible via VO/GND headers. JP1 provides hardware-level enable/disable control, directly interfacing with the EN pin of the ISL9104IRUAZ-T. The board includes 1µH power inductor (L1), two 4.7µF X5R input/output capacitors (C1, C2), and optional 47pF compensation capacitor (C3) populated only on adjustable versions.

Key Specifications

Availability

ISL9104IRUAEVAL1Z is available at Aetrix Electronics and suitable for portable medical devices, wearable sensors, IoT edge nodes, and ultra-low-power microcontroller power supplies requiring stable component supply, quick-turn evaluation, and validated layout practices.

Supply support for ISL9104IRUAEVAL1Z 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 industrial, automotive, and consumer applications.

The ISL9104 product line delivers high-efficiency, high-frequency buck regulators optimized for battery-powered systems where small solution size, low IQ, and fast transient response are critical.

FAQ

What is the purpose of the ISL9104IRUAEVAL1Z evaluation board?

The ISL9104IRUAEVAL1Z evaluation board provides a fully assembled, tested platform to characterize the ISL9104IRUAZ-T adjustable-output buck regulator. It allows engineers to verify startup behavior, load regulation, line regulation, efficiency, and transient response without designing a custom PCB. All key components-including the IC, inductor, input/output capacitors, and feedback network-are pre-populated per AN1522 Rev 1.00.

How do I configure the output voltage on the ISL9104IRUAEVAL1Z?

The ISL9104IRUAEVAL1Z ships with R1 and R2 both set to 100kΩ, resulting in a default output voltage of 1.6V (VOUT = 0.8V × (1 + R2/R1)). To change VOUT, replace either resistor with values satisfying VOUT = 0.8V × (1 + R2/R1). Note that C3 (47pF) is populated only on adjustable versions and must remain in place for stability when modifying feedback resistors.

What input voltage range is supported by the ISL9104IRUAEVAL1Z?

The ISL9104IRUAEVAL1Z supports an input voltage range of 2.7V to 6.0V, as specified in AN1522. This range accommodates common battery sources including single-cell Li-ion (3.0–4.2V), Li-polymer, and dual-cell alkaline/NiMH (2.4–3.2V), while ensuring safe operation above the dropout voltage (VOUT + VDROP) across the full 0–500mA load range.

Does the ISL9104IRUAEVAL1Z include thermal management features?

The ISL9104IRUAEVAL1Z relies on the thermal characteristics of the ISL9104IRUAZ-T itself, which uses a 1.6×1.6mm µTDFN-6 package with exposed pad for heat dissipation. The board layout follows recommended copper pour guidelines from the datasheet, but no additional heatsinks or thermal vias are included. Full thermal performance validation requires measurement under actual load and ambient conditions per AN1522 test procedures.

Can the ISL9104IRUAEVAL1Z be used to evaluate fixed-output variants of the ISL9104?

No - the ISL9104IRUAEVAL1Z is specifically configured for the adjustable-output ISL9104IRUAZ-T variant. Fixed-output versions (e.g., 1.2V, 1.5V, 3.3V) use different part numbers (e.g., ISL9104IRUWEVAL1Z) with R1 shorted (0Ω) and R2/C3 unpopulated. Using this board with a fixed-output IC would require manual component changes and invalidate the default 1.6V setting and compensation network.