Renesas ISL81802EVAL2Z

Overview

ISL81802EVAL2Z from Renesas Electronics is a dual-output evaluation board for the ISL81802 80V dual synchronous buck controller, configured to demonstrate independent 12V/10A and 5V/10A outputs from an 18–80V input. It implements full peak current mode control, phase interleaving, programmable soft-start, and comprehensive OVP/UVP/OTP/OCP protection. The board supports real-time current monitoring, external clock synchronization, and PGOOD sequencing for telecom and data center power supply validation.

For engineers reviewing the ISL81802EVAL2Z datasheet, ISL81802EVAL2Z pinout, ISL81802EVAL2Z application, or ISL81802EVAL2Z equivalent, this evaluation platform enables rapid validation of dual-output DC-DC converter designs with 4.5–80V input range, 0.8–76V output adjustability, interleaved or independent operation modes, and thermal performance verification using the TQFN-packaged ISL81802 controller.

Technical Context

The ISL81802EVAL2Z implements the ISL81802 controller in dual-output configuration-Channel 1 delivers 12V/10A, Channel 2 delivers 5V/10A-using discrete MOSFETs, shielded power inductors, and low-ESR ceramic/polymer output capacitors. Each channel features independent voltage feedback (0.8V reference), average current sensing via CS1+/CS1− and CS2+/CS2−, and dedicated soft-start/tracking pins (SS/TRK1, SS/TRK2/OV).

Board-level design incorporates Renesas-recommended layout practices: separated SGND/PGND planes tied at single point, EPAD soldered to thermal ground plane, bootstrap capacitor routing with low-inductance diode paths, and RT/SYNC resistor set for 500kHz switching frequency. Clock synchronization and phase-shift programming are accessible via CLKOUT/DITHER and IMON2/EN/UVLO2 pins per datasheet Figure 41.

Key Specifications

Availability

ISL81802EVAL2Z is available at Aetrix Electronics and suitable for telecom power system validation, data center VRM prototyping, industrial dual-rail supply development, and automotive infotainment power architecture testing requiring stable component supply and documented reference design fidelity.

Supply support for ISL81802EVAL2Z 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 leader delivering microcontrollers, analog power, and SoC solutions for automotive, industrial, and infrastructure markets, with deep expertise in high-voltage power management ICs.

The ISL81802EVAL2Z belongs to Renesas' high-input-voltage buck controller evaluation platform family, designed specifically to accelerate qualification of 48V–80V intermediate bus converters in server, networking, and industrial power systems.

FAQ

What is the primary function of the ISL81802EVAL2Z evaluation board?

The ISL81802EVAL2Z evaluation board demonstrates the dual-output capability of the ISL81802 80V synchronous buck controller, providing two independently regulated outputs-12V/10A and 5V/10A-from an 18–80V input. It validates key features including phase interleaving, current-mode control, soft-start sequencing, and full protection schemes. Engineers use ISL81802EVAL2Z to verify layout, thermal performance, and dynamic response before custom design implementation.

Does the ISL81802EVAL2Z support external clock synchronization?

Yes, the ISL81802EVAL2Z supports external clock synchronization via the RT/SYNC pin of the onboard ISL81802 controller. When an external clock signal is applied to this pin, the internal oscillator locks to that frequency, enabling precise timing alignment across multiple ISL81802EVAL2Z boards or with other synchronized power stages. This functionality is fully routed and test-point accessible on the evaluation board.

Can the ISL81802EVAL2Z be reconfigured for dual-phase single-output operation?

No-the ISL81802EVAL2Z is fixed for dual-output operation (12V + 5V). While the underlying ISL81802 controller supports dual-phase single-output mode via pin strapping (e.g., connecting IMON2 >3V), the ISL81802EVAL2Z PCB layout, component selection, and feedback networks are optimized exclusively for independent dual-output use per Figure 4 of R16DS0033EU0103.

What thermal performance can be expected from the ISL81802EVAL2Z under full load?

At 80V input and 10A per output (12V + 5V), the ISL81802EVAL2Z maintains ISL81802 junction temperature ≤105°C with 200LFM airflow and standard 4-layer PCB with EPAD soldered to internal ground plane. Thermal imaging confirms MOSFET case temperatures remain <95°C, validating Renesas' recommended thermal design guidelines for the TQFN package.

Is the ISL81802EVAL2Z compatible with the ISL81802FRTZ-T7A controller variant?

Yes-the ISL81802EVAL2Z is designed for the 32-lead 5mm×5mm TQFN package and is fully compatible with the ISL81802FRTZ-T7A, which shares identical pinout, electrical specifications, and thermal characteristics. The board uses the same footprint, decoupling, and biasing scheme specified for the FRTZ variant in the ISL81802 datasheet ordering table.