Renesas ISL6504ACR

Overview

ISL6504ACR from Intersil is a multiple linear power controller with ACPI control interface, integrating three linear regulators and dual switching controllers for 3.3VDUAL/3.3VSB, 5VDUAL, 1.2VVID, and 1.5VSB outputs in a single IC. It operates across 0°C to 70°C, delivers ±2.0% output voltage regulation, supports S0–S5 ACPI states, and uses external NPN/N-MOS/PMOS pass devices for flexible power delivery in ATX-compliant motherboard designs.

For engineers reviewing the ISL6504ACR datasheet, ISL6504ACR pinout, ISL6504ACR application, or ISL6504ACR equivalent, key selection considerations include its QFN-20 package footprint, S3/S5 digital sleep-state control logic, 5VDUAL behavior in S4/S5 (remains active), undervoltage monitoring across all four outputs, and thermal shutdown at 155°C - critical for reliable ACPI power sequencing in embedded and desktop computing platforms.

Technical Context

The ISL6504ACR implements a state-machine-driven ACPI controller with dedicated error amplifiers for each regulated output (1.5VSB, 1.2VVID, 3.3VDUAL/3.3VSB) and dual-switch control logic for 5VDUAL. Its internal 10 μA soft-start current source charges an external capacitor to coordinate ramp-up timing across outputs during POR and state transitions.

It features deglitched S3/S5 inputs (2 μs filter), 200 μs S3-to-sleep delay, and independent UV detection per output with 10–30 ms fault response latency. The FAULT pin reports undervoltage, overtemperature (>140°C flag, >155°C shutdown), or illegal state transitions via open-collector pull-up to 5VSB.

Key Specifications

Pinout & Package

ISL6504ACR is housed in a 20-pin 6×6 mm QFN package with exposed thermal pad connected to GND. The bottom pad improves thermal performance (θJC = 4.0°C/W) and may be left unconnected or tied to GND plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL6504CR and RT8205A, the ISL6504ACR uniquely guarantees 5VDUAL continuity across all ACPI sleep states - a hardware-enforced requirement for reliable resume-from-disk and wake-on-LAN in legacy and embedded ATX platforms without firmware or external logic intervention.

Availability

ISL6504ACR is available at Aetrix Electronics and suitable for desktop motherboard design, industrial embedded control, and network-attached storage applications requiring stable component supply and long-term lifecycle support.

Supply support for ISL6504ACR 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, industrial, and communications markets.

The ISL6504 product line was designed specifically for ACPI-compliant motherboard power sequencing, integrating multiple linear regulators and switching controllers to replace discrete supervisor and regulator solutions in space-constrained ATX designs.

FAQ

What is the key functional difference between ISL6504ACR and ISL6504CR?

The ISL6504ACR maintains 5VDUAL output during S4/S5 sleep states, whereas the ISL6504CR shuts down 5VDUAL in S4/S5. This distinction is hardware-defined and enables wake-on-LAN and resume-from-disk functionality without external circuitry. All other electrical characteristics, pinout, and package dimensions are identical between ISL6504ACR and ISL6504CR.

Does ISL6504ACR require external pass transistors for all outputs?

Yes - ISL6504ACR requires external pass devices: an NPN transistor for 3.3VDUAL/3.3VSB in sleep states, NMOS transistors driven by DLA for 3.3V/5V connection in active states, and a PMOS or PNP transistor driven by 5VDLSB for 5VDUAL in S3/S4/S5. Only the 1.5VSB and 1.2VVID regulators are fully integrated with internal pass elements.

How does the FAULT pin behave during undervoltage events on ISL6504ACR outputs?

When any monitored output (1.5VSB, 1.2VVID, 3.3VDUAL/3.3VSB, 5VDUAL) or input (3V3, 5VSB) falls below its UV threshold, the FAULT pin is pulled high to 5VSB via an internal ~100 Ω driver. For internally regulated outputs (1.5VSB, 1.2VVID), the faulting regulator shuts off; for externally switched outputs, only the FAULT signal asserts - the external FET remains under system control.

Can ISL6504ACR operate without the SS (soft-start) capacitor?

No - the SS capacitor is mandatory. It sets the timing for coordinated output ramp-up during power-on and state transitions. Omitting it disables soft-start, risks output overshoot, violates UV monitor activation sequence, and may trigger immediate FAULT latching due to uncontrolled voltage rise. A 0.1 μF ceramic capacitor is recommended per datasheet guidelines for ISL6504ACR.

What thermal performance can be expected from ISL6504ACR in its QFN-20 package?

The ISL6504ACR QFN-20 package delivers θJC = 4.0°C/W and θJA = 32°C/W under standard test conditions. With proper PCB layout - including a solid GND plane, thermal vias under the exposed pad, and adequate copper area - it sustains continuous operation up to 125°C junction temperature and triggers unconditional shutdown only at 155°C, ensuring robust thermal safety in dense motherboard layouts.