Renesas ISL6504CB

Overview

ISL6504CB from Intersil is a multiple linear power controller with ACPI control interface for motherboard power management. It integrates three linear regulators (1.5VSB, 1.2VVID, 3.3VDUAL/3.3VSB) and one dual-mode 5VDUAL switch controller into a 16-pin wide-body SOIC package. It delivers ±2.0% output voltage regulation across temperature and supports S0–S5 ACPI sleep states via S3/S5 digital inputs.

For engineers reviewing the ISL6504CB datasheet, ISL6504CB pinout, ISL6504CB application, or ISL6504CB equivalent, this device serves as a legacy ACPI-compliant power sequencer for ATX-based microprocessor systems requiring coordinated 1.2V VID, 1.5VSB, 3.3VDUAL/3.3VSB, and state-aware 5VDUAL regulation - with precise undervoltage monitoring, soft-start timing, and thermal fault reporting.

Technical Context

The ISL6504CB implements four independent regulated outputs: an internal 1.5VSB linear regulator (VOUT1), an internal 1.2VVID linear regulator active only in S0/S1/S2, a 3.3VDUAL/3.3VSB linear controller using external NPN/N-MOS pass devices depending on sleep state, and a 5VDUAL switch controller that connects ATX 5V in active states or ATX 5VSB in S3 (and S4/S5 for ISL6504A - but ISL6504CB shuts down 5VDUAL in S4/S5).

Its control architecture uses two digital inputs (S3, S5) with internal 50kΩ pull-ups to 5VSB, deglitched with 2μs filtering and 200μs S3-to-sleep delay logic. Fault detection includes undervoltage monitoring on all outputs and ATX rails (3.3V, 5VSB), centralized FAULT pin reporting, and thermal shutdown at 155°C - with latch-off behavior on critical startup faults.

Key Specifications

Pinout & Package

ISL6504CB is housed in a 16-lead wide-body SOIC package (M16.3 footprint), compatible with both wide and narrow SOIC footprints per datasheet note. The package supports standard reflow profiles and is RoHS-compliant (Pb-free option available as ISL6504CBZ).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multiple linear power controller applications.

Compared with ISL6504ACB, ISL6504CB provides stricter G3 power gating by shutting down 5VDUAL in S4/S5 - reducing standby leakage. Compared with RT8205A, ISL6504CB delivers autonomous, hardware-based ACPI state handling without firmware dependency, making it suitable for BIOS-agnostic motherboard designs.

Availability

ISL6504CB is available at Aetrix Electronics and suitable for desktop motherboard design, ATX power sequencing, and legacy industrial computing platforms requiring stable component supply and long-term lifecycle support.

Supply support for ISL6504CB 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 IC designer known for high-reliability, precision power solutions targeting computing and industrial markets.

The ISL6504CB belongs to Intersil's ACPI-compliant power controller product line, designed specifically for ATX motherboard power architecture to replace discrete supervisors and simplify multi-rail sequencing in S0–S5 state transitions.

FAQ

What is the key functional difference between ISL6504CB and ISL6504ACB?

The sole functional difference is 5VDUAL behavior in S4/S5 sleep states: ISL6504CB shuts down 5VDUAL, while ISL6504ACB keeps it active. This distinction is documented in Table 1 of the FN9062 datasheet and determines whether USB/keyboard/mouse remain powered during soft-off. All other pin functions, timing, regulation, and fault behavior are identical between ISL6504CB and ISL6504ACB.

Does ISL6504CB support both SOIC and QFN packages?

No - ISL6504CB is exclusively offered in the 16-lead wide-body SOIC package (M16.3). The QFN variant is designated as ISL6504CR (20-pin 6×6 mm). The "CB" suffix in ISL6504CB explicitly denotes the SOIC package; QFN versions use "CR" and have different pinouts, thermal characteristics, and layout requirements.

How does ISL6504CB handle thermal faults?

ISL6504CB reports overtemperature via the FAULT pin at 140°C (typical) and performs unconditional shutdown of all outputs at 155°C (typical). After shutdown, operation resumes only after cycling the 5VSB supply to trigger a new power-on reset. This prevents thermal runaway in poorly ventilated chassis or under sustained overload conditions.

Can ISL6504CB be used in new designs today?

ISL6504CB is marked "OBSOLETE PRODUCT - NO RECOMMENDED REPLACEMENT" in the official FN9062 datasheet. While Aetrix Electronics maintains limited legacy inventory for repair and continuity, new designs should evaluate modern alternatives such as Renesas ISL6504A-compatible successors or multi-rail PMICs with updated ACPI support and enhanced efficiency.

What external components are mandatory for ISL6504CB operation?

Mandatory external components include: a 0.1μF soft-start capacitor on SS pin; 1kΩ pull-down on FAULT; 10kΩ pull-up on VID_PG; 1kΩ pull-up from DLA to ATX 12V; and external pass transistors (NPN for 3.3VDUAL in sleep, N-MOS for 3.3VDUAL in active, P-MOS/PNP for 5VDUAL in S3). No bypass capacitors are listed as optional - all are required for stability and regulation.