Renesas ISL91133IIN-EVZ

Overview

ISL91133IIN-EVZ from Renesas Electronics is an evaluation board designed to rapidly assess the ISL91133 integrated boost-with-bypass switching regulator, supporting fixed-output voltage options of 3.5V and 3.7V via jumper-selectable VSET. It operates from 2.35V–5.4V input, delivers up to 2.3A output current at 3.3V, features 2.5MHz switching frequency, and includes on-board jumpers for EN, BYPS, and VSET configuration.

For engineers reviewing the ISL91133IIN-EVZ datasheet, ISL91133IIN-EVZ pinout, ISL91133IIN-EVZ application, or ISL91133IIN-EVZ equivalent, this board enables fast functional validation of boost/bypass mode transitions, light-load PFM efficiency, quiescent current behavior (108µA Boost / 45µA Forced Bypass), and transient response under Li-ion battery-powered load conditions.

Technical Context

The ISL91133IIN-EVZ implements a complete reference design for the ISL91133 WLCSP regulator, integrating all critical passive components-including 0.47µH inductor, three 22µF X5R output/input capacitors, and 330µF bulk input capacitor-to demonstrate full-system operation with minimal external parts. It supports both Auto and Forced Bypass modes using a 38mΩ internal switch.

Functional control is implemented via three 3-pin headers (J3, J4, J5) for EN, VSET, and BYPS selection, enabling direct verification of enable sequencing, output voltage offset scaling, and bypass activation logic without soldering or component changes. The board operates across –40°C to +85°C ambient temperature.

Key Specifications

Availability

ISL91133IIN-EVZ is available at Aetrix Electronics and suitable for battery-powered portable electronics development, power architecture validation, and DC-DC regulator qualification requiring stable component supply, rapid prototyping support, and production-representative test data.

Supply support for ISL91133IIN-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 delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and consumer applications.

The ISL91133IIN-EVZ belongs to Renesas' precision power management evaluation platform family, engineered specifically to accelerate adoption of high-efficiency, low-quiescent-current boost-with-bypass regulators in space-constrained, battery-sensitive designs.

FAQ

What is the primary function of the ISL91133IIN-EVZ?

The ISL91133IIN-EVZ is an evaluation board for the ISL91133 integrated boost-with-bypass regulator. It provides a fully assembled, tested platform to validate key performance metrics-including efficiency curves, bypass transition behavior, light-load PFM operation, and transient response-under real-world input/output conditions. The ISL91133IIN-EVZ does not function as a standalone power supply but serves exclusively as a characterization and design verification tool for the ISL91133 IC.

How do I configure the ISL91133IIN-EVZ for 3.5V output?

To set the ISL91133IIN-EVZ for 3.5V output, install a jumper on header J4 connecting the VSET pin to GND (low state). This selects the lower of the two factory-programmed output voltages. The ISL91133IIN-EVZ supports only the 3.5V/3.7V pair; other output options require different board variants (e.g., ISL91133IIM-EVZ for 3.3V/3.5V). Confirm output regulation using TP3 (VOUT test point) after applying input power between 2.35V and 5.4V.

Does the ISL91133IIN-EVZ support both Auto and Forced Bypass modes?

Yes, the ISL91133IIN-EVZ supports both Auto and Forced Bypass modes via jumper J5. Shorting BYPS to VIN configures Auto Bypass (transitioning automatically when VIN ≥ 1.015 × VOUT); shorting BYPS to GND enables Forced Bypass regardless of input voltage. Quiescent current drops to ~45µA in Forced Bypass mode, verified per AN1958 Rev 0.00 startup guide. The ISL91133IIN-EVZ's schematic and layout are optimized to maintain stability and efficiency in both operating states.

What external equipment is required to operate the ISL91133IIN-EVZ?

To operate the ISL91133IIN-EVZ, you need a programmable DC power supply (2.35V–5.4V, ≥2.5A), an electronic load (0–2.3A), and a digital multimeter or oscilloscope for monitoring VOUT (TP3), EN (TP1), and SW node (TP2). Power connects via 6-pin header J1; load connects via J2. Jumpers J3 (EN), J4 (VSET), and J5 (BYP) must be installed per desired configuration before powering. No additional ICs or firmware are needed-the ISL91133IIN-EVZ functions autonomously once powered.

Can the ISL91133IIN-EVZ be used for long-term system integration?

No-the ISL91133IIN-EVZ is strictly an evaluation board intended for laboratory-based characterization and design verification, not for permanent system integration. Its layout, component selection (e.g., 330µF bulk capacitor), and mechanical form factor are optimized for probing and measurement-not reliability, thermal cycling, or EMI compliance in end products. For production use, designers must implement the ISL91133 IC on their own PCB following Renesas' layout guidelines and thermal recommendations. The ISL91133IIN-EVZ itself contains no user-programmable elements or firmware.