Renesas ISL91117IIA-EVZ

Overview

ISL91117IIA-EVZ from Renesas Electronics is an evaluation board for the ISL91117 high-efficiency synchronous boost converter IC, designed to demonstrate operation of the 2.34mm×1.72mm WLCSP device delivering up to 1.5A output at 5V from 1.8–4.8V input. It supports adjustable output voltage via external resistor divider, forced-PWM and external clock synchronization modes, and features true input-output disconnect during disable. The board enables rapid validation in portable power applications such as USB-OTG and HDMI-powered peripherals.

For engineers reviewing the ISL91117IIA-EVZ datasheet, ISL91117IIA-EVZ pinout, ISL91117IIA-EVZ application, or ISL91117IIA-EVZ equivalent, this evaluation platform provides verified reference design implementation, thermal performance data under load transients, efficiency curves across input voltage and load conditions, and layout guidance for WLCSP-based boost converters operating at 2.6MHz switching frequency.

Technical Context

The ISL91117IIA-EVZ implements a complete test platform for the ISL91117 boost regulator, featuring a 1µH shielded inductor, dual 22µF X5R output capacitors, 22µF input capacitor, and precision 320kΩ/60.4kΩ feedback divider targeting 5V output. It validates the IC's peak-current-mode control architecture, integrated 90mΩ P-channel and 75mΩ N-channel MOSFETs, and soft-discharge function (120Ω internal discharge path).

This board demonstrates critical system-level behaviors: PFM-to-PWM transition thresholds (75mA/200mA), 2.4–2.9MHz oscillator tolerance, 35µA no-load quiescent current, and thermal shutdown recovery at +125°C hysteresis - all measured with the ISL91117IIAZ-T WLCSP device mounted per recommended land pattern and grounding scheme.

Key Specifications

Availability

ISL91117IIA-EVZ is available at Aetrix Electronics and suitable for USB-OTG power delivery validation, portable HDMI interface testing, and battery-backed boost converter qualification requiring stable component supply and documented thermal performance under transient loads.

Supply support for ISL91117IIA-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 is a global semiconductor manufacturer specializing in microcontrollers, analog power management, and timing solutions for automotive, industrial, and consumer applications.

The ISL91117IIA-EVZ belongs to Renesas' high-density power conversion evaluation platform family, engineered to accelerate adoption of ultra-compact, high-frequency boost regulators in space-constrained portable electronics.

FAQ

What is the primary purpose of the ISL91117IIA-EVZ?

The ISL91117IIA-EVZ is an evaluation board specifically designed to validate the performance of the ISL91117 synchronous boost converter IC. It provides a fully assembled, tested reference design with optimized layout, component selection (including 1µH inductor and dual 22µF output capacitors), and documented test points for measuring efficiency, transient response, and thermal behavior - enabling engineers to verify functionality before integrating the ISL91117 into their own PCB designs.

Does the ISL91117IIA-EVZ support adjustable output voltage?

Yes, the ISL91117IIA-EVZ supports adjustable output voltage through its external resistor divider network (320kΩ/60.4kΩ), which sets VOUT to 5V as a default. Engineers can replace these resistors to configure other output voltages per the formula VOUT = 0.8V × (1 + R1/R2), maintaining compatibility with the ISL91117's 0.788–0.812V FB pin reference voltage and ensuring stable regulation across load and temperature ranges.

Can the ISL91117IIA-EVZ demonstrate forced-PWM and external synchronization modes?

Yes, the ISL91117IIA-EVZ includes direct access to the MODE pin, allowing users to configure forced-PWM operation (MODE = LOW) or external clock synchronization (2.75–3.25MHz signal applied to MODE). This enables noise-sensitive system validation, EMI characterization, and timing-critical applications where switching frequency must be locked to a system master clock - all using the same ISL91117IC on the evaluation board.

How does the ISL91117IIA-EVZ implement input-output disconnect and soft-discharge?

The ISL9117IIA-EVZ demonstrates the ISL91117's true input-output disconnect feature when EN is pulled low: the internal blocking FET opens, isolating PVIN from VOUT, while the 120Ω soft-discharge path between VOUT and GND actively discharges the output capacitors. This behavior is measurable on the board via test points and confirms safe, controlled shutdown without output voltage hold-up - critical for battery-powered systems requiring zero standby leakage.

What thermal and protection features of the ISL91117 are validated on the ISL91117IIA-EVZ?

The ISL91117IIA-EVZ validates the ISL91117's thermal shutdown (trip at +150°C, resume at +125°C), short-circuit protection (via FB voltage monitoring), undervoltage lockout (1.725V rising threshold), and overcurrent limiting (4.2A typical P-channel peak current). These protections are observable during overload, input brownout, and hot-swap tests - confirming robust operation of the ISL91117 under fault conditions as implemented in the WLCSP package.