Renesas ISL6506ACBZ-T

Overview

ISL6506ACBZ-T from Renesas Electronics is a dual-rail ACPI-compliant linear power controller for motherboard 5VDUAL and 3.3VDUAL regulation. It integrates an internal 3.3V LDO (1A current limit), 5VDUAL switch control, S3/S5 digital state interface, and over-temperature shutdown in an 8-lead EPSOIC package. It delivers precise ±2.0% 3.3VDUAL regulation during S3/S4/S5 sleep states and supports ATX-compliant microprocessor power sequencing.

For engineers reviewing the ISL6506ACBZ-T datasheet, ISL6506ACBZ-T pinout, ISL6506ACBZ-T application, or ISL6506ACBZ-T equivalent, this page provides verified functional identity, validated sleep-state behavior (5VDUAL remains active in S4/S5), confirmed thermal shutdown threshold (140°C), exact package dimensions (M8.15C), and real-world timing parameters including 8.2ms soft-start interval and 58µs S0→S3 transition delay.

Technical Context

The ISL6506ACBZ-T implements dual-output ACPI power control using discrete external MOSFETs: one P-channel (Q2) for 5VDUAL switching from 5VSB in sleep states, and two N-channel devices (Q1, Q3) for direct connection to ATX 3.3V/5V rails in active states. Its DLA pin drives NMOS gates via a 1kΩ pull-up to 12V, enabling synchronized wake-up sequencing.

It features integrated POR monitoring on both 5VSB (4.5V rising threshold) and 12VATX (9.8V typical), digital soft-start with 7.5µA 5VDLSB current source, and undervoltage protection on the internal 3.3V LDO (2.475V trip). The IC operates exclusively from 5VSB bias and requires no auxiliary supply.

Key Specifications

Pinout & Package

Package: 8-lead EPSOIC (exposed pad), RoHS-compliant, M8.15C outline (4.80–4.98mm width, 3.81–3.99mm length, 1.42–1.70mm height). Exposed pad must be connected to ground plane via ≥3 vias for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ISL6506BCBZ-T, the ISL6506ACBZ-T provides guaranteed 5VDUAL continuity in S4/S5 at the cost of higher sleep-state power draw; compared with RT8205AZSP, it offers proven ACPI timing compliance and simpler layout but lower efficiency due to linear regulation architecture.

Availability

ISL6506ACBZ-T is available at Aetrix Electronics and suitable for desktop motherboard power management, ACPI-compliant embedded controller interfaces, and low-power peripheral hub supply requiring stable component supply across long-lifecycle production runs.

Supply support for ISL6506ACBZ-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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, and power management ICs for industrial, automotive, and computing markets.

The ISL6506A product line was designed specifically for ACPI-compliant motherboard power sequencing, integrating dual-rail control, sleep-state intelligence, and thermal safety into a single EPSOIC package for ATX platform consolidation.

FAQ

What is the key functional difference between ISL6506ACBZ-T and ISL6506BCBZ-T?

The ISL6506ACBZ-T maintains 5VDUAL output during S4/S5 sleep states, enabling always-on USB and LAN functionality. In contrast, ISL6506BCBZ-T shuts down 5VDUAL in S4/S5 to minimize system standby power. Both share identical pinout, package, and 3.3VDUAL regulation, but ISL6506ACBZ-T uses a 1A internal LDO while ISL6506BCBZ-T supports 2A - making ISL6506ACBZ-T ideal for legacy-compatible designs requiring peripheral retention.

Does ISL6506ACBZ-T require external MOSFETs, and if so, what types?

Yes, ISL6506ACBZ-T requires three external MOSFETs: one P-channel device (Q2) connected to the 5VDLSB pin for 5VDUAL switching from 5VSB in sleep states, and two N-channel devices (Q1, Q3) driven by the DLA pin to connect ATX 3.3V/5V rails to 3.3VDUAL/5VDUAL in active states. Q2 must be a logic-level P-MOSFET rated for ≥4.5V VGS(th); Q1/Q3 require low rDS(ON) and adequate thermal packaging for continuous conduction.

What is the purpose of the DLA pin on ISL6506ACBZ-T, and how must it be connected?

The DLA pin on ISL6506ACBZ-T is an open-drain output used to drive the gates of N-channel MOSFETs Q1 and Q3 during wake-up. It must be connected to the ATX 12V rail through a 1kΩ pull-up resistor - this resistor sets the POR threshold for the 12V rail and enables synchronized turn-on of both 3.3VDUAL and 5VDUAL outputs. Using a different resistor value alters the 12V POR level and may cause unreliable wake-up sequencing.

How does ISL6506ACBZ-T handle undervoltage on the 3.3VDUAL rail during sleep states?

During S3/S4/S5 sleep states, ISL6506ACBZ-T monitors the 3V3AUX pin for undervoltage. If the voltage drops below 2.475V (25% below nominal), the internal LDO is disabled. After one soft-start interval, it retries regulation; after three failed attempts, the LDO locks out until a full power-on reset (POR) occurs. This behavior prevents brownout-induced system instability while maintaining fault containment within the power controller.

Is ISL6506ACBZ-T compatible with lead-free reflow processes, and what is its moisture sensitivity level?

Yes, ISL6506ACBZ-T is Pb-free and RoHS-compliant, qualified for standard lead-free reflow profiles per JEDEC J-STD-020. Its moisture sensitivity level (MSL) is defined in the Renesas ISL6506A device pages and aligns with standard commercial-grade plastic packages - typically MSL3 (168 hours floor life at ≤30°C/60% RH). Proper dry-pack storage and bake-out per TB363 are required prior to reflow if exposed beyond floor life limits.