Renesas ISL91134IIQ-EVZ

Overview

ISL91134IIQ-EVZ from Renesas Electronics is an evaluation board for the ISL91134 high-efficiency 1.8A boost regulator with input-to-output bypass functionality. It supports fixed 5V output, operates from 2.35V–5.4V input, delivers up to 1.8A at 5V (VIN = 3V), features 2.5MHz switching frequency, and enables forced or auto bypass via a 38mΩ internal MOSFET - designed specifically for USB OTG power sourcing and RF PA biasing in compact mobile devices.

For engineers reviewing the ISL91134IIQ-EVZ datasheet, ISL91134IIQ-EVZ pinout, ISL91134IIQ-EVZ application, or ISL91134IIQ-EVZ equivalent, this evaluation platform provides validated reference design, thermal performance characterization, load transient response validation, and seamless integration with ISL91134IIQZ production-grade WLCSP devices for rapid prototyping of battery-powered boost applications.

Technical Context

The ISL91134IIQ-EVZ implements a complete hardware testbed for the ISL91134 synchronous boost regulator IC, featuring a 0.47µH shielded inductor, dual 22µF X5R ceramic input/output capacitors, and full access to all 16-ball WLCSP signals including EN, BYPS, VSEL, PG, LX, VIN, VOUT, and PGND. It validates both PWM (2.5MHz) and PFM light-load operation, as well as seamless transitions between boost and bypass modes under real-world load steps.

This board demonstrates the ISL91134's valley-current-mode control architecture, integrated 38mΩ bypass FET (Q3), dual soft-start current levels (550mA/1100mA), and fault recovery hiccup mode - all while maintaining <108µA quiescent current in boost mode and 45µA in forced bypass, per the FN8678 Rev.2.00 datasheet.

Key Specifications

Availability

ISL91134IIQ-EVZ is available at Aetrix Electronics and suitable for USB OTG power sourcing, smartphone RF PA biasing, and tablet PC auxiliary rail generation requiring stable component supply, fast evaluation turnaround, and production-matched thermal behavior.

Supply support for ISL91134IIQ-EVZ 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 is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and consumer applications.

The ISL91134 product line targets space-constrained, battery-powered mobile systems requiring high-efficiency step-up conversion with ultra-low quiescent current and seamless input-to-output bypass - optimized for smartphones, tablets, and wireless communication devices.

FAQ

What is the ISL91134IIQ-EVZ used for?

The ISL91134IIQ-EVZ is an evaluation board designed exclusively to validate and prototype the ISL91134IIQZ 1.8A boost regulator IC. It provides a fully assembled, tested reference design with optimized layout, thermal management, and signal access points - enabling engineers to verify efficiency, load transient response, bypass mode transitions, and system-level integration before committing to custom PCB design. The ISL91134IIQ-EVZ itself contains no active silicon beyond the ISL91134IIQZ device it hosts.

Does the ISL91134IIQ-EVZ include the ISL91134IIQZ IC?

Yes, the ISL91134IIQ-EVZ includes one mounted ISL91134IIQZ IC in its native 16-ball WLCSP package (1.78mm × 1.78mm, 0.4mm pitch). This production-grade device is pre-soldered and fully functional, allowing immediate testing of boost regulation, forced/auto bypass behavior, power-good signaling (PG), and enable control (EN) without additional assembly. The board is shipped ready-to-power with no configuration required.

Can the ISL91134IIQ-EVZ be used to evaluate 5.2V output operation?

Yes, the ISL91134IIQ-EVZ supports 5.2V output evaluation via the VSEL pin. As specified in the FN8678 datasheet, pulling VSEL HIGH selects the higher output level (5.2V), while pulling it LOW selects the standard 5.0V output. The board exposes VSEL as a test point and includes pull-up/pull-down resistor footprints, enabling quick reconfiguration without soldering - confirming the ISL91134IIQZ's dual-voltage capability under real load conditions.

What external components are populated on the ISL91134IIQ-EVZ?

The ISL91134IIQ-EVZ includes a 0.47µH shielded inductor (TDK TFM201610A or equivalent), two 22µF X5R ceramic capacitors (input and output), and all necessary decoupling and feedback passives per Figure 1 of FN8678. No additional external components are required for basic operation. Test points provide direct access to VIN, VOUT, LX, PG, EN, BYPS, and VSEL for oscilloscope probing and signal injection during ISL91134IIQZ characterization.

Is thermal performance data available for the ISL91134IIQ-EVZ?

Yes, thermal performance is characterized in the ISL91134 datasheet (FN8678 Rev.2.00): θJA = 70°C/W and θJB = 14°C/W for the 16-ball WLCSP package used on the ISL91134IIQ-EVZ. The board implements recommended layout practices - short PGND traces, thermal vias under the IC pad, and proximity-optimized capacitor placement - enabling accurate junction temperature estimation during 1.8A continuous operation and validating thermal shutdown behavior at +150°C (typical) and warning at +120°C.