Renesas ISL6504ACB-T

Overview

ISL6504ACB-T from Intersil is a multiple linear power controller with ACPI control interface, designed for motherboard power management in microprocessor systems. It integrates four regulated outputs - 3.3VDUAL/3.3VSB (3.3V), 5VDUAL (5V), 1.2VVID (1.2V), and 1.5VSB (1.5V) - with undervoltage monitoring, thermal shutdown, and S3/S5 sleep-state control logic. It operates across 0°C to 70°C and supports ATX-compliant power sequencing for PCI, south bridge, and chipset standby functions.

For engineers reviewing the ISL6504ACB-T datasheet, ISL6504ACB-T pinout, ISL6504ACB-T application, or ISL6504ACB-T equivalent, this device delivers precise ACPI-compliant voltage regulation across four rails with integrated fault reporting, soft-start timing control, and dual-package compatibility (16-pin SOIC wide-body).

Technical Context

The ISL6504ACB-T implements a mixed-signal architecture combining three linear regulators (1.2VVID, 1.5VSB, 3.3VDUAL/3.3VSB) and one dual-mode switch controller for 5VDUAL. Its S3/S5 digital inputs drive state transitions between active (S0/S1/S2), suspend-to-RAM (S3), and suspend-to-disk/soft-off (S4/S5) modes, with internal deglitching (2 µs) and transition delay (200 µs on S3).

It features independent undervoltage detection per output (±2.0% regulation tolerance), centralized FAULT reporting via open-drain output, and temperature monitoring with fault-level (125°C) and shutdown-level (155°C) thresholds. The 10 µA soft-start current source charges an external capacitor to coordinate ramp-up timing across all outputs.

Key Specifications

Pinout & Package

ISL6504ACB-T uses a 16-pin wide-body SOIC package (M16.3 footprint), with GND referenced signal integrity and exposed substrate grounding compatible with standard PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL6504CB-T, ISL6504ACB-T extends 5VDUAL availability into S4/S5 for enhanced wake capability; compared with RT8015CGQW, it retains external pass transistor flexibility for thermal and cost optimization in high-current motherboard implementations.

Availability

ISL6504ACB-T is available at Aetrix Electronics and suitable for motherboard power management, ATX-compliant embedded computing, and industrial PC designs requiring stable component supply across extended lifecycle windows.

Supply support for ISL6504ACB-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 (now part of Renesas Electronics) is a semiconductor manufacturer specializing in precision analog and power management ICs for computing, communications, and industrial markets.

The ISL6504A product line was engineered specifically for ACPI-compliant motherboard power sequencing, integrating multi-rail regulation, sleep-state logic, and fault monitoring into a single compact controller for x86 platform designers.

FAQ

What is the key functional difference between ISL6504ACB-T and ISL6504CB-T?

The ISL6504ACB-T maintains the 5VDUAL output during S4/S5 sleep states, whereas the ISL6504CB-T shuts it down. This distinction enables USB wake-from-soft-off and network boot functionality in systems using ISL6504ACB-T. Both share identical pinout, package, and all other electrical characteristics - only the S4/S5 5VDUAL behavior differs per Table 1 in FN9062 Rev 2.00.

Does ISL6504ACB-T require external pass transistors for all four regulated outputs?

No - ISL6504ACB-T integrates internal pass elements only for the 1.2VVID and 1.5VSB regulators. The 3.3VDUAL/3.3VSB and 5VDUAL outputs rely on external NPN, PMOS, or NMOS transistors driven by dedicated pins (3V3DLSB, 5VDLSB, DLA). This architecture allows thermal and current scalability beyond monolithic limits while retaining tight regulation control.

How does the FAULT pin behave during undervoltage events on ISL6504ACB-T?

When any monitored output (3.3VDUAL, 5VDUAL, 1.2VVID, 1.5VSB) or ATX input (3.3V, 5VSB) falls below its undervoltage threshold, the FAULT pin is pulled high to 5VSB via an internal open-drain driver. It remains asserted until the fault condition clears and the soft-start cycle completes. Pulling SS low resets FAULT and forces a full restart sequence.

Can ISL6504ACB-T operate without the SS (soft-start) capacitor?

No - the SS pin requires an external capacitor (minimum 5 nF, 0.1 µF recommended) to enable controlled voltage ramp-up and prevent 5VSB supply collapse during startup. Omitting the capacitor disables soft-start, risks UV faults during power-up, and may cause latch-off. The 10 µA internal current source relies on this capacitor to generate the timing ramp used by all error amplifiers.

What is the role of the VID_CT pin on ISL6504ACB-T, and how is its value selected?

The VID_CT pin connects to a capacitor that delays VID_PG assertion, ensuring the 1.2VVID output stabilizes before signaling "power good" to the processor. A 1 nF capacitor yields ~1 ms delay; 10 nF yields ~10 ms. Selection follows C (nF) = tDELAY (ms) per Figure 10 in FN9062 - critical for preventing premature CPU wake or VID misreads during active-state transitions.