Renesas ISL91127IRN-EVZ

Overview

ISL91127IRN-EVZ from Renesas Electronics is an evaluation board designed to demonstrate the ISL91127IRNZ fixed-output 3.3V buck-boost switching regulator. It supports 1.8V–5.5V input, delivers up to 2A output current at 3.3V, operates at 2.5MHz switching frequency, and functions across –40°C to +85°C ambient temperature-ideal for battery-powered portable electronics validation.

For engineers reviewing the ISL91127IRN-EVZ datasheet, ISL91127IRN-EVZ pinout, ISL91127IRN-EVZ application, or ISL91127IRN-EVZ equivalent, this board enables rapid functional verification of high-efficiency buck-boost regulation near battery voltage crossover points, including EN/MODE configuration, startup waveform analysis, and efficiency measurement under real load conditions.

Technical Context

The ISL91127IRN-EVZ implements a dedicated hardware platform for the ISL91127IRNZ IC, which uses Intersil's proprietary buck-boost algorithm to maintain regulation when input voltage crosses the fixed 3.3V output-enabling seamless transition between buck and boost modes without output dropout. The board integrates optimized power stage components including a 1µH Toko DFE322512C inductor (4.6A typical saturation current) and 150µF tantalum output capacitance.

It provides jumper-controlled enable (J3) and mode selection (J4 for auto-PFM/forced-PWM), test points for VOUT, LX1, LX2, EN, and MODE signals, and dual 6-pin headers (J1 for load, J2 for input) rated for high-current operation-ensuring accurate characterization of transient response, ripple, and thermal behavior under defined operating conditions.

Key Specifications

Availability

ISL91127IRN-EVZ is available at Aetrix Electronics and suitable for battery management validation, portable power subsystem prototyping, and DC-DC converter efficiency benchmarking requiring stable component supply and documented reference design fidelity.

Supply support for ISL91127IRN-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 manufacturer formed from the merger of Renesas Technology and NEC Electronics, delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and enterprise markets.

The ISL91127IRN-EVZ belongs to Renesas' legacy Intersil power management evaluation platform family, engineered specifically to accelerate adoption of high-efficiency buck-boost regulators for next-generation battery-powered devices with dynamic input voltage profiles.

FAQ

What is the primary function of the ISL91127IRN-EVZ?

The ISL91127IRN-EVZ is an evaluation board designed exclusively for the ISL91127IRNZ fixed 3.3V buck-boost regulator IC. It provides a fully assembled, tested platform with optimized layout and component selection-including a 1µH Toko inductor and 150µF tantalum output capacitor-to validate regulation stability, efficiency, and transient performance across 1.8V–5.5V input range. The ISL91127IRN-EVZ does not function as a standalone power supply but serves as a characterization tool for the underlying ISL91127IRNZ IC.

Does the ISL91127IRN-EVZ support adjustable output voltage?

No, the ISL91127IRN-EVZ is configured only for fixed 3.3V output, matching the internal feedback network of the ISL91127IRNZ IC it evaluates. Unlike the ISL91127IRA-EVZ (which uses R2 to set output voltage from 2V to 5V), the ISL91127IRN-EVZ has R2 marked DNP and U1 populated with the fixed-output ISL91127IRNZ in 4mm×4mm QFN package. Output voltage adjustment requires using the ISL91127IRA-EVZ or modifying the feedback network per the ISL91127IR datasheet.

How do I configure enable and mode control on the ISL91127IRN-EVZ?

Enable (EN) and Mode (auto-PFM/forced-PWM) are controlled via onboard 3-pin jumpers J3 and J4. To activate the ISL91127IRN-EVZ, install a jumper across pins 1–2 of J3 to connect EN to VIN. For forced-PWM operation, install a jumper across pins 1–2 of J4 to tie MODE to VIN; for auto-PFM, leave J4 unjumpered or connect pins 2–3. These configurations are verified in the UG080 user guide and directly interface with the ISL91127IRNZ IC's logic-level control inputs.

What input and output connections does the ISL91127IRN-EVZ provide?

The ISL91127IRN-EVZ uses two 6-pin vertical headers: J2 accepts input power (PVIN and GND) across its pins, supporting 1.8V–5.5V at up to 2A; J1 delivers regulated 3.3V output (VOUT and GND) to the load. Both headers include dedicated power and ground pins to minimize impedance and ensure stable high-current operation. Test points TP1–TP6 provide direct access to VOUT, LX1, LX2, EN, MODE, and SGND for oscilloscope probing without soldering.

Is the ISL91127IRN-EVZ RoHS-compliant and lead-free?

Yes, the ISL91127IRN-EVZ conforms to RoHS Directive 2011/65/EU and is manufactured with lead-free finishes and halogen-free materials, consistent with Renesas Electronics' environmental compliance policy. This is confirmed by Renesas' public product change notices and material declarations for the ISL91127IR series evaluation boards, including UG080 Rev 2.00 documentation dated October 2016.