Renesas ISL91133IIP-EVZ

Overview

ISL91133IIP-EVZ from Renesas is an evaluation board designed to rapidly assess the ISL91133 integrated boost-with-bypass switching regulator, optimized for single-cell Li-ion/Li-polymer battery-powered systems delivering up to 2.3A at 4.5V/4.76V output. It supports input voltages from 2.35V to 5.4V, operates across –40°C to +85°C ambient, and features jumper-selectable EN, BYPS, and VSET modes for flexible configuration.

For engineers reviewing the ISL91133IIP-EVZ datasheet, ISL91133IIP-EVZ pinout, ISL91133IIP-EVZ application, or ISL91133IIP-EVZ equivalent, this board enables fast functional validation of high-efficiency boost/bypass operation, light-load PFM mode behavior, quiescent current performance (108µA Boost / 45µA Forced Bypass), and 2.5MHz switching frequency impact on external component sizing.

Technical Context

The ISL91133IIP-EVZ implements a complete reference design for the ISL91133 WLCSP regulator, integrating all necessary passive components-including 0.47µH inductor, three 22µF X5R output capacitors, and 330µF input bulk capacitor-to demonstrate full-system operation with minimal external parts. It supports dual-output voltage selection (4.5V/4.76V) via VSET jumper configuration.

Functional control is implemented through three 3-pin headers: J3 for EN (VIN- or open), J5 for BYPS (Auto or Forced Bypass), and J4 for VSET (GND or NC). Test points TP1–TP5 and 6-pin connectors J1 (input) and J2 (load) provide direct access to VIN, VOUT, SW, PG, and ground nodes for real-time probing and load testing.

Key Specifications

Availability

ISL91133IIP-EVZ is available at Aetrix Electronics and suitable for battery-powered portable electronics development, power architecture validation, and DC-DC efficiency benchmarking requiring stable component supply and traceable evaluation hardware.

Supply support for ISL91133IIP-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 ISL91133IIP-EVZ belongs to Renesas' precision power evaluation platform family, engineered to accelerate adoption of high-efficiency, low-quiescent-current boost/bypass regulators in space-constrained, battery-sensitive designs.

FAQ

What is the primary function of the ISL91133IIP-EVZ?

The ISL91133IIP-EVZ is an evaluation board for the ISL91133 integrated boost-with-bypass regulator. Its purpose is to enable rapid functional verification of the IC's dual-mode operation-boost conversion when VIN < VOUT and low-loss bypass when VIN ≥ VOUT-under real-world load, thermal, and transient conditions. The board includes all critical passives and jumpers for mode selection, making it a turnkey test platform for the ISL91133.

How do I configure the ISL91133IIP-EVZ for 4.76V output?

To set the ISL91133IIP-EVZ to its higher output voltage of 4.76V, install a jumper on header J4 connecting the VSET pin to GND. This activates the internal offset scaling circuitry of the ISL91133, raising the nominal 4.5V output by ~5.8%. The board's ordering code "IIP" explicitly denotes this 4.5V/4.76V option, and the configuration is validated per AN1958 Rev 0.00 section "Quick Setup Guide".

Does the ISL91133IIP-EVZ support forced bypass mode?

Yes, the ISL91133IIP-EVZ supports forced bypass mode via jumper J5. When J5 is shorted to GND (not VIN), the BYPS pin is pulled low, forcing the ISL91133 into bypass regardless of input-output voltage relationship. In this state, the board draws only ~45µA quiescent current-measured directly per AN1958-and delivers near-zero dropout regulation, ideal for ultra-low-power standby testing.

What are the key test points on the ISL91133IIP-EVZ?

The ISL91133IIP-EVZ provides four labeled test points: TP1 (GND), TP2 (SW node), TP3 (VOUT), and TP4 (PG - Power Good signal). These allow non-invasive probing of switching waveform, regulated output, gate drive activity, and status signaling without soldering. TP3 is especially critical for verifying output accuracy and load regulation across the 0–2.3A range, as confirmed in AN1958 Figure 2 and efficiency curves.

Can the ISL91133IIP-EVZ be used with input voltages below 2.5V?

No-the ISL91133IIP-EVZ is rated for input voltages from 2.35V to 5.4V, but the ISL91133 IC itself requires minimum VIN ≥ 2.5V to sustain 2.3A output at 3.3V per datasheet specifications. While the board may power on at 2.35V, full-load performance and regulation stability are only guaranteed above 2.5V, as validated in AN1958's "Operating Range" and "Quick Start Guide" sections.