Renesas ISL6558EVAL2Z

Overview

ISL6558EVAL2Z from Intersil (now Renesas Electronics) is a two-phase interleaved DC/DC buck converter evaluation board designed to demonstrate the ISL6558 four-phase PWM controller and ISL6609 synchronous-rectified MOSFET drivers. It delivers 1.35V at up to 30A continuous output from a 5V input, operates at 500kHz switching frequency, achieves 90% peak efficiency, and supports rapid 200A/µs load transients for mid-range router power applications.

For engineers reviewing the ISL6558EVAL2Z datasheet, ISL6558EVAL2Z pinout, ISL6558EVAL2Z application, or ISL6558EVAL2Z equivalent, this page provides verified board-level specifications, thermal and transient performance data, modification guidance for 12V input or 4-phase operation, and design validation results from Intersil's AN1044 application note.

Technical Context

The ISL6558EVAL2Z implements an interleaved two-phase synchronous buck topology using the ISL6558IR (20-pin MLFP, 5×5 mm) controller and four ISL6609CR (8-pin MLFP, 3×3 mm) gate drivers. It employs external Hitachi HAT2164H upper FETs and HAT2168H lower FETs in LFPAK packages, with 300 nH per-channel input inductors and 390 µF low-ESR output capacitors.

Board-level features include programmable soft-start via R19, droop option support, Tri-State® shutdown coordination between ISL6558 and ISL6609, hiccup-mode overcurrent protection, and overvoltage latch-off triggered at 1.15×V_OUT. Input voltage sequencing (VIN before VCC5) is enforced to prevent uncontrolled duty cycle during startup.

Key Specifications

Availability

ISL6558EVAL2Z is available at Aetrix Electronics and suitable for router power subsystem validation, high-density server VRM prototyping, and telecom DC/DC converter development requiring stable component supply, fast load transient response, and multi-phase control reference designs.

Supply support for ISL6558EVAL2Z 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 (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, power management, and timing solutions for industrial, automotive, and communications markets.

The ISL6558EVAL2Z belongs to Renesas' Endura™ power management evaluation platform, engineered to accelerate design of high-efficiency, high-current, low-profile DC/DC converters for networking infrastructure and computing applications.

FAQ

What is the primary function of the ISL6558EVAL2Z evaluation board?

The ISL6558EVAL2Z evaluation board demonstrates a two-phase interleaved synchronous buck converter using the ISL6558IR controller and ISL6609CR drivers. It delivers 1.35V at up to 30A from a 5V input, enabling validation of transient response, efficiency, thermal behavior, and multi-phase control architecture. The board serves as a reference for designing high-density, high-efficiency VRMs in routers and similar systems - not as a production-ready module.

Can the ISL6558EVAL2Z operate from a 12V input source?

Yes, the ISL6558EVAL2Z can be modified for 12V input operation: JP1 must be removed to protect the ISL6558IR and ISL6609CR, a separate 5V bias supply is required for VCC5, D1 is added for reverse-bias protection, input capacitors must be replaced with ≥16V-rated units (e.g., Panasonic ECA1CHG101), and compensation gain (R11) must be scaled by 5/12 for stability. Input sequencing (12V before 5V) is mandatory to retain soft-start functionality.

What are the key thermal and efficiency characteristics of the ISL6558EVAL2Z?

The ISL6558EVAL2Z achieves 90% peak efficiency at 30A, 5V input, and 200LFM airflow, dropping to 89.3% with no airflow. Thermal performance relies on LFPAK-packaged Hitachi HAT2164H/HAT2168H FETs and optimized PCB copper layout. Power dissipation totals ~4.7W at full load, with upper/lower FET conduction and switching losses dominating. Efficiency decreases at high line/low load due to switching-loss dominance, improving with load due to conduction-loss scaling.

How does the ISL6558EVAL2Z handle overcurrent and short-circuit conditions?

The ISL6558EVAL2Z enters hiccup-mode protection during overcurrent or short-circuit events, reducing average power dissipation and preventing thermal damage. The ISL6558IR detects overcurrent via ISENx inputs and latches off PWM outputs, while PGOOD remains low until fault clearance and soft-start completion. Under permanent short, the board sustains ~185Hz hiccup cycling with safe average component stress - validated per Figure 14 in AN1044.

What modifications are required to scale the ISL6558EVAL2Z to four-phase operation?

To enable four-phase operation on the ISL6558EVAL2Z, add current sense resistors R2 and R17, set JP2 and JP4 to ON (away from TP5/TP8), and scale compensation gain R11 by 1/2 for phase margin stability. The board's layout supports all four phases - PHASE1 through PHASE4 are implemented with dedicated driver ICs (U1–U5), inductors (L1–L5), and FETs. Full 4-phase operation enables up to 80A output current.