Renesas ISL6548A-6506EVAL1Z

Overview

ISL6548A-6506EVAL1Z from Intersil is a fully assembled, functional evaluation board for the ISL6548A ACPI-compliant dual-channel DDR memory power controller IC. It implements all five regulated outputs - VDDQ (synchronous buck), DDR_VTT (integrated sink-source LDO), GMCH core (PWM with external driver), CPU/GMCH VTT (sink-source LDO), and ICH7 (LDO) - and supports seamless S0/S1/S3 state transitions with glitch-free regulation, 250kHz phase-shifted PWM operation, and thermal/overvoltage/undervoltage protection. Designed for validation in desktop and graphics card memory power systems.

For engineers reviewing the ISL6548A-6506EVAL1Z datasheet, ISL6548A-6506EVAL1Z pinout, ISL6548A-6506EVAL1Z application, or ISL6548A-6506EVAL1Z equivalent, this board enables rapid verification of ACPI sleep-state sequencing, VDDQ/VTT tracking accuracy (±2%), soft-start timing (8.2ms typical), VIDPGD logic behavior, and fault recovery under real-world load transients and thermal stress.

Technical Context

The ISL6548A-6506EVAL1Z implements the complete ISL6548A reference design per AN1124 and FN9189, including dual 250kHz PWM controllers (180° phase-shifted), integrated 3A DDR_VTT sink-source regulator with VDDQ/2 precision divider, and three independent LDO controllers driving external N-MOSFET pass devices. All control logic, protection circuitry (OCSET-based overcurrent, UV/OV monitoring, thermal shutdown at 140°C), and ACPI state machine are exercised on-board.

It validates the ISL6548A's unique soft-start architecture: three-cycle error amplifier reset followed by digital ramp-controlled enable sequencing (VDDQ → VGMCH → VTT_GMCH/CPU & VICH7 → VTT_DDR), plus VREF_IN capacitor-controlled VTT_DDR rise time. The board also demonstrates adaptive shoot-through protection via direct UGATE/LGATE monitoring without gate-resistor interference.

Key Specifications

Availability

ISL6548A-6506EVAL1Z is available at Aetrix Electronics and suitable for DDR2 memory subsystem validation, graphics card GPU/memory supply qualification, and embedded processor I/O rail design requiring stable component supply, full ACPI compliance testing, and production-ready power architecture verification.

Supply support for ISL6548A-6506EVAL1Z 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

Intersil Corporation (now part of Renesas Electronics) is a U.S.-based analog and power management semiconductor company known for high-performance DC/DC controllers, voltage regulators, and precision analog ICs targeting computing, industrial, and communications markets.

The ISL6548A-6506EVAL1Z belongs to Intersil's ACPI Power Management Evaluation Platform series, designed specifically to accelerate validation of multi-rail, multi-state power solutions for DDR memory systems in desktop, workstation, and discrete graphics applications.

FAQ

What is the primary purpose of the ISL6548A-6506EVAL1Z evaluation board?

The ISL6548A-6506EVAL1Z is a fully populated, tested evaluation board that implements the complete ISL6548A reference design per Application Note AN1124. Its purpose is to enable engineers to validate the ISL6548A's five-output power architecture-including VDDQ buck regulation, DDR_VTT tracking, GMCH core PWM, CPU/GMCH VTT LDO, and ICH7 LDO-under real ACPI sleep-state transitions, load steps, and fault conditions without custom PCB development. It confirms timing, sequencing, and protection behavior specified in FN9189.

Does the ISL6548A-6506EVAL1Z support both DDR and DDR2 memory voltage requirements?

Yes, the ISL6548A-6506EVAL1Z supports both DDR and DDR2 specifications through its ISL6548A controller IC, which provides user-adjustable VDDQ output down to 0.8V with ±2% regulation tolerance across line, load, and temperature. The board's resistor-divider network and feedback compensation are configured to meet DDR2's tighter VDDQ (1.8V ±0.09V) and VTT (0.9V ±15mV) tolerances, while remaining compatible with legacy DDR (2.5V/1.25V) via reconfiguration.

How does the ISL6548A-6506EVAL1Z demonstrate ACPI S3 state behavior?

The ISL6548A-6506EVAL1Z validates S3 state operation by accepting industry-standard SLP_S3# and SLP_S5# logic signals to control regulator enable/disable sequencing. During S3, it confirms VDDQ remains active (supplied by 5VDUAL), DDR_VTT is disabled (allowing rail to float), VIDPGD goes low, and VGMCH/VTT_GMCH/CPU/VICH7 are powered down-all while maintaining proper undervoltage monitoring and fast, glitch-free re-entry to S0 via controlled soft-start. This matches the timing diagram in FN9189 Figure 1.

Can the ISL6548A-6506EVAL1Z be used to verify overcurrent protection functionality?

Yes, the ISL6548A-6506EVAL1Z enables full verification of VDDQ overcurrent protection using the OCSET pin and external ROCSET resistor. By loading the VDDQ rail and adjusting ROCSET per the equation I_PEAK = (I_OCSET × R_OCSET) / r_DS(ON), users can trigger hiccup-mode shutdown and confirm soft-start restart behavior, fault counter increment (up to 4 in S5-restart, 5 otherwise), and coordinated disable of dependent rails like VTT_DDR. This is validated per FN9189 Section "VDDQ Overcurrent Protection".

What thermal performance data can be extracted using the ISL6548A-6506EVAL1Z?

Using the ISL6548A-6506EVAL1Z, engineers can measure junction temperature rise under full load and confirm thermal shutdown activation at ~140°C (per FN9189 Absolute Maximum Ratings), as well as hysteresis behavior-outputs remain disabled until junction cools below ~110°C and either POR is re-triggered or SLP_S5# is toggled. The board's exposed paddle QFN mounting and thermal vias allow direct IR thermography or thermocouple attachment to the ISL6548ACRZA package for empirical θ_JA/θ_JC correlation.