Renesas ISL6504ACR-T

Overview

ISL6504ACR-T from Intersil is a multiple linear power controller with ACPI control interface, integrating three linear regulators and dual switching controllers for 1.5VSB, 1.2VVID, 3.3VDUAL/3.3VSB, and 5VDUAL outputs in a single 20-pin QFN 6×6 package. It delivers ±2.0% output regulation over temperature, supports S0–S5 ACPI states, and uses external NPN/N-MOS/PMOS pass devices for dynamic voltage routing in motherboard power systems.

For engineers reviewing the ISL6504ACR-T datasheet, ISL6504ACR-T pinout, ISL6504ACR-T application, or ISL6504ACR-T equivalent, key selection considerations include its S4/S5 sleep-state 5VDUAL retention (vs. ISL6504), 0°C to 70°C operating range, QFN thermal resistance (θ_JA = 32°C/W), fault reporting via open-drain FAULT pin, and VID_PG timing control through VID_CT capacitor.

Technical Context

The ISL6504ACR-T implements ACPI-compliant state transitions using dual digital inputs (S3, S5) with internal 50 kΩ pull-ups to 5VSB and 2 μs noise filtering. Its architecture separates active-state operation (S0/S1/S2) - where 3.3VDUAL connects directly to ATX 3.3V and 5VDUAL to ATX 5V - from sleep states (S3/S4/S5), where 3.3VDUAL is regulated from 5VSB via external NPN and 5VDUAL remains powered from 5VSB via PMOS/PNP.

It integrates four independent regulation paths: an internal 1.5VSB LDO (VOUT1) sourcing from 3V3DL, an internal 1.2VVID LDO (VOUT2) active only in S0/S1/S2 and sourcing from 3V3, a 3.3VDUAL/3.3VSB linear controller (VOUT3) with dual-path topology, and a 5VDUAL switch controller (VOUT4) with undervoltage detection at 4.10 V and hysteresis of 200 mV.

Key Specifications

Pinout & Package

ISL6504ACR-T uses a 20-pin QFN 6×6 mm package with exposed thermal pad electrically connected to GND. The bottom pad may be left unconnected or soldered to GND plane; 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 ISL6504CR-T, ISL6504ACR-T adds S4/S5 5VDUAL persistence essential for hibernation; compared with RT8205AZQW, it provides fully integrated ACPI auxiliary rail control without external sequencing logic or supplemental LDOs.

Availability

ISL6504ACR-T is available at Aetrix Electronics and suitable for desktop motherboard design, ACPI-compliant power sequencing, and embedded PC platforms requiring stable component supply and legacy-compatible packaging.

Supply support for ISL6504ACR-T 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 was a U.S.-based semiconductor company specializing in precision analog and power management ICs, later acquired by Renesas Electronics in 2017.

The ISL6504A product line was designed specifically for ACPI-compliant motherboard power architectures, delivering integrated control of auxiliary voltage rails (5VDUAL, 3.3VDUAL, 1.5VSB, 1.2VVID) with state-aware switching and fault monitoring.

FAQ

What is the key functional difference between ISL6504ACR-T and ISL6504CR-T?

The ISL6504ACR-T maintains the 5VDUAL output active during S4/S5 sleep states, enabling wake-from-disk functionality, whereas the ISL6504CR-T shuts down 5VDUAL in S4/S5. This distinction is the sole functional difference between the two parts and is explicitly defined in Table 1 of the ISL6504 datasheet. Both share identical pinout, package, and all other regulation features including ±2.0% output accuracy and QFN thermal performance.

Does ISL6504ACR-T support both SOIC and QFN packages?

No - ISL6504ACR-T is exclusively offered in the 20-pin QFN 6×6 mm package (Ordering Code: L20.6x6). The SOIC variants are designated with "CB" or "CBN" suffixes (e.g., ISL6504ACB), while "CR" denotes QFN. The "-T" suffix indicates tape-and-reel packaging, not package type. ISL6504ACR-T therefore has fixed QFN mechanical and thermal characteristics, including θ_JA = 32°C/W and exposed GND pad.

How does the ISL6504ACR-T handle overtemperature conditions?

The ISL6504ACR-T reports overtemperature via the FAULT pin starting at ~140°C (typical), but continues operation until junction temperature reaches ~155°C (typical), at which point all outputs shut down unconditionally. Recovery requires cycling the 5VSB supply to trigger a new power-on reset. The QFN package's low θ_JA (32°C/W) and exposed thermal pad help mitigate thermal stress, and the FAULT signal allows host systems to log thermal events before shutdown.

Can ISL6504ACR-T operate without external pass transistors?

No - ISL6504ACR-T requires external pass devices for all four outputs: an NPN transistor for 3.3VDUAL in sleep states, NMOS for 3.3VDUAL/5VDUAL in active states, PMOS/PNP for 5VDUAL in S3/S4/S5, and external FETs driven by DLA and 5VDLSB pins. The IC contains only internal LDOs for 1.5VSB and 1.2VVID; all main power paths rely on external silicon selected per load current and thermal requirements.

What is the purpose of the SS pin on ISL6504ACR-T, and how is it used?

The SS (Soft-Start) pin on ISL6504ACR-T serves dual functions: (1) controlling output voltage ramp rate via a 10 μA internal current source charging an external capacitor (recommended 0.1 μF), and (2) acting as a global shutdown input - pulling SS below 0.8 V forces all outputs off and resets the FAULT pin. This pin enables controlled power-up sequences and system-level emergency shutdown without requiring reset of the 5VSB supply.