Renesas ISL6504ACRZ

Overview

ISL6504ACRZ from Intersil is a multiple linear power controller with ACPI control interface for motherboard power management. It integrates four regulated outputs - 3.3VDUAL/3.3VSB (3.3 V ±2.0%), 5VDUAL (5 V, active in S0–S3 and S4/S5), 1.5VSB (1.5 V ±2.0%), and 1.2VVID (1.2 V ±2.0%) - using internal regulators and external pass transistors. It operates across 0°C to 70°C in ACPI-compliant microprocessor systems.

For engineers reviewing the ISL6504ACRZ datasheet, ISL6504ACRZ pinout, ISL6504ACRZ application, or ISL6504ACRZ equivalent, key selection considerations include S3/S5 state control logic, dual-mode 5VDUAL behavior in S4/S5 sleep states, integrated undervoltage monitoring with centralized FAULT reporting, thermal shutdown at 155°C, and QFN-20 package compatibility with ATX power supply sequencing requirements.

Technical Context

The ISL6504ACRZ implements ACPI-compliant power-state transitions via digital S3 and S5 inputs with 200 µs S3 delay and 2 µs input deglitching. Its architecture separates active-state (S0/S1/S2) and sleep-state (S3/S4/S5) regulation paths: 3.3VDUAL uses an external N-channel MOSFET in active mode and NPN transistor in sleep mode; 5VDUAL switches between ATX 5V (active) and ATX 5VSB (S3/S4/S5) via NMOS/PMOS control.

It features four independent voltage monitors (3.3V, 5VSB, 3.3VDUAL, 5VDUAL), a temperature monitor with fault-level (125°C) and shutdown-level (155°C) thresholds, and soft-start controlled by a 10 µA current source charging an external capacitor. The VID_PG signal is delayed via a 10 µA charge into VID_CT capacitance to coordinate processor VID power-good timing.

Key Specifications

Pinout & Package

ISL6504ACRZ is housed in a 20-pin QFN 6×6 mm package with exposed thermal pad electrically connected to GND. The bottom pad may be left unconnected or tied to GND; connection to any other potential is prohibited.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiple-output ACPI power controller applications.

Compared with ISL6504CRZ, ISL6504ACRZ adds S4/S5 5VDUAL retention for wake-on-USB; compared with RT8205AZQW, ISL6504ACRZ uses external pass devices for lower quiescent current and simpler thermal design in cost-sensitive ATX implementations.

Availability

ISL6504ACRZ is available at Aetrix Electronics and suitable for desktop motherboard design, ACPI-compliant suspend-to-disk systems, and embedded industrial control boards requiring stable component supply and long-term lifecycle support.

Supply support for ISL6504ACRZ 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 semiconductor company specializing in precision analog and power management ICs for computing and industrial applications.

The ISL6504A product line was designed specifically for ACPI-compliant motherboard power sequencing, delivering tightly regulated multi-rail outputs with integrated state control, fault monitoring, and thermal protection in compact packages.

FAQ

What is the key functional difference between ISL6504ACRZ and ISL6504CRZ?

The ISL6504ACRZ maintains the 5VDUAL output active during S4/S5 sleep states, enabling wake-on-USB and peripheral functionality in deep sleep. In contrast, ISL6504CRZ shuts down 5VDUAL in S4/S5. This difference is implemented solely through internal logic - both share identical pinout, package, and all other electrical specifications. ISL6504ACRZ is the preferred choice for modern ATX systems requiring persistent 5V auxiliary power.

How does ISL6504ACRZ handle thermal faults?

The ISL6504ACRZ incorporates two thermal thresholds: a fault-level trigger at 125°C (reported via FAULT pin) and an unconditional shutdown at 155°C. Between these points, the IC continues operation while signaling thermal stress. Shutdown is not latched - normal operation resumes only after cycling 5VSB to reset the internal POR circuit. This behavior ensures fail-safe response without requiring external reset circuitry, and applies identically across all ISL6504ACRZ units regardless of batch or date code.

Can ISL6504ACRZ operate without an external soft-start capacitor?

No - the ISL6504ACRZ requires an external capacitor on the SS pin (minimum 5 nF, 0.1 µF recommended) to enable controlled output voltage ramp-up and prevent inrush current issues. Omitting this capacitor disables soft-start functionality and risks 5VSB supply collapse during power-up, especially in sleep-state initialization. The internal 10 µA soft-start current source relies on this capacitor to generate the voltage ramp that controls error amplifier references; absence results in uncontrolled, potentially destructive output slew rates.

What is the role of the DLA pin in ISL6504ACRZ operation?

The DLA pin is an open-collector output used to drive the gates of external N-channel MOSFETs that switch ATX 3.3V and 5V into the 3.3VDUAL and 5VDUAL outputs during active states (S0/S1/S2). It is pulled low during sleep states. A 1 kΩ resistor must connect DLA to the ATX 12V rail to provide sufficient gate drive voltage. This architecture allows efficient, low-loss connection of main ATX rails while keeping ISL6504ACRZ's internal circuitry isolated from high-current paths.

Does ISL6504ACRZ support RoHS compliance?

Yes - ISL6504ACRZ is RoHS compliant and Pb-free, using 100% matte tin plate termination finish and RoHS-compliant molding compounds. It meets IPC/JEDEC J-STD-020 reflow profiles for lead-free soldering and is rated MSL-3. The "Z" suffix in the part number explicitly denotes the Pb-free version, and it is compatible with both SnPb and Pb-free assembly processes without derating or special handling beyond standard QFN reflow guidelines.