Renesas ISL6536AIBZ-T

Overview

ISL6536AIBZ-T from Intersil is a four-channel voltage supervisory IC that monitors up to four positive supply rails >0.7V using external resistor dividers and an internal 0.633V reference with ±1% threshold accuracy. It features open-drain PGOOD output, 30µs glitch immunity on VMON inputs, and guaranteed PGOOD validity down to VDD = 1V. It is used in graphics cards and multi-rail DSP/processor power systems for coordinated power-good signaling.

For engineers reviewing the ISL6536AIBZ-T datasheet, ISL6536AIBZ-T pinout, ISL6536AIBZ-T application, or ISL6536AIBZ-T equivalent, key selection considerations include independent VMON threshold adjustability per rail, EN-controlled reset capability, open-drain PGOOD OR-ing support, and Pb-free SOIC-8 packaging compliant with IPC/JEDEC J-STD-020B reflow profiles.

Technical Context

The ISL6536AIBZ-T implements a Boolean AND logic function across four independently programmable undervoltage monitor inputs (VMON1–VMON4), each compared to a precision 0.633V internal reference with 1mV inter-channel range and 33µV/°C temperature coefficient. Its PGOOD output releases only when all monitored rails exceed their thresholds and pulls low within 15ns of any rail falling below threshold.

It operates from a 2.7V–5.5V VDD bias supply, draws ≤1mA quiescent current, and includes a 10µA pull-up on ENABLE and a 20kΩ internal pull-up on PGOOD. The VMON inputs reject transients ≤30µs, and PGOOD remains valid during VDD decay down to 1V - enabling reliable sequencing in brown-out conditions.

Key Specifications

Pinout & Package

ISL6536AIBZ-T is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, M8.15), Pb-free with 100% matte tin termination, MSL-3 rated for Pb-free reflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar four-channel voltage supervisory applications.

Compared with TPS3307-33DGNR and MAX6804US29D3+T, the ISL6536AIBZ-T uniquely delivers true four-channel independent monitoring with integrated AND logic, internal PGOOD pull-up, and guaranteed sub-1V operation - making it the only option supporting full quad-rail coordination without external logic or additional supervisors.

Availability

ISL6536AIBZ-T is available at Aetrix Electronics and suitable for graphics cards, embedded control systems, and medical equipment requiring stable component supply with full RoHS and Pb-free compliance.

Supply support for ISL6536AIBZ-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, designs high-performance analog and power management ICs for computing, communications, and industrial markets.

The ISL6536AIBZ-T belongs to Intersil's supervisory IC product line, engineered specifically for multi-rail power integrity assurance in space-constrained, high-reliability digital systems.

FAQ

What is the primary function of the ISL6536AIBZ-T?

The ISL6536AIBZ-T is a four-channel voltage supervisory IC that monitors up to four positive supply rails (>0.7V) using external resistor dividers and an internal 0.633V reference. It asserts a single open-drain PGOOD signal only when all monitored rails exceed their individually set thresholds. The ISL6536AIBZ-T is commonly deployed in graphics cards and multi-voltage processor systems to ensure safe power sequencing and fault detection.

Does the ISL6536AIBZ-T require an external pull-up resistor on the PGOOD pin?

No, the ISL6536AIBZ-T includes a 20kΩ internal pull-up resistor to VDD on the PGOOD pin, eliminating the need for an external component. This simplifies design and reduces BOM count. However, because PGOOD is open-drain, it can still be externally pulled to a different logic level (e.g., 1.8V or 2.5V) if interfacing with mixed-voltage systems - the ISL6536AIBZ-T itself does not drive high actively.

How does the ENABLE pin affect PGOOD behavior in the ISL6536AIBZ-T?

The ENABLE pin on the ISL6536AIBZ-T provides hardware-controlled reset: pulling ENABLE below 0.5V forces PGOOD low immediately, regardless of VMON input states. With a 10µA internal pull-up to VDD, ENABLE can be driven by a push-button switch to ground or standard logic outputs. This feature allows manual or system-initiated reset without altering supply voltages - a key capability for debug and recovery in systems using the ISL6536AIBZ-T.

Can the ISL6536AIBZ-T monitor a 1.0V rail directly?

No - the ISL6536AIBZ-T's VMON inputs compare against a fixed 0.633V internal reference and are designed for input voltages ≥0.7V. To monitor a 1.0V rail, use a resistor divider (e.g., 100kΩ + 62kΩ) to scale it down to ~0.633V at the VMON pin. The ISL6536AIBZ-T's 1% threshold accuracy and 30µs glitch filter ensure reliable detection even with such scaling, making it suitable for modern low-voltage rails when properly configured.

What is the thermal performance of the ISL6536AIBZ-T in its SOIC-8 package?

The ISL6536AIBZ-T in its Pb-free SOIC-8 package (M8.15) has a typical junction-to-ambient thermal resistance (θJA) of 108°C/W under standard JEDEC test conditions. Its maximum junction temperature is 150°C, and it supports reflow soldering per IPC/JEDEC J-STD-020B for Pb-free processes. This thermal profile makes the ISL6536AIBZ-T suitable for compact, convection-cooled applications like embedded controllers and portable medical devices.