Analog Devices Inc./Maxim Integrated MAX1662EUB+T

Overview

MAX1662EUB+T from Maxim Integrated is a SMBus-compatible serial-to-parallel/parallel-to-serial converter and load-switch controller designed for P-channel MOSFET gate driving in power-plane switching applications. It features three 28V-tolerant bidirectional I/O pins, ultra-low 3µA supply current, +2.7V to +5.5V operation, and high-impedance power-up state to ensure safe power sequencing in notebook computers.

For engineers reviewing the MAX1662EUB+T datasheet, MAX1662EUB+T pinout, MAX1662EUB+T application, or MAX1662EUB+T equivalent, this device serves as a low-quiescent-current, SMBus-addressable switch controller with asynchronous suspend-mode register selection, thermal/overcurrent protection, and interrupt reporting via ALERT and START-STOP protocols.

Technical Context

The MAX1662EUB+T implements a dual-register SMBus slave architecture where SMBSUS selects between normal and suspend data registers-enabling asynchronous power-plane reconfiguration without serial bus latency. Its I/O pins operate as open-drain outputs (for driving P-MOSFET gates) or TTL-level inputs (with ±28V tolerance), sampled on SMBCLK falling edges during readback.

It integrates hardware interrupt generation on I/O state change or thermal shutdown, with individual mask bits per I/O and START-STOP software interrupt capability. The device uses a static SMBus logic block compliant with Intel SMBus v1.1 timing, including tSU:STA ≥4µs, tHD:STA ≥4µs, and tBUF ≥4.7µs, while supporting DC–100kHz clocking.

Key Specifications

Pinout & Package

MAX1662EUB+T is housed in a 10-pin µMAX package (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed pad, rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar load-switch controller applications.

Compared with MAX1662EUB+T, MAX1663EUB+T offers identical performance and layout compatibility but requires firmware address update, whereas TPS22965DSGR lacks SMBus configurability, thermal protection, and multi-rail coordination - making it unsuitable for notebook power sequencing or fault-aware designs.

Availability

MAX1662EUB+T is available at Aetrix Electronics and suitable for notebook computer power sequencing, point-of-load switching, and smart battery management requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX1662EUB+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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in analog, mixed-signal, and power management ICs for industrial, computing, and portable applications.

The MAX166x family was designed specifically for SMBus-controlled power-plane switching in space- and power-constrained systems such as notebooks, where low IQ, high-voltage I/O tolerance, and robust fault reporting are critical.

FAQ

What is the power-up behavior of the MAX1662EUB+T?

The MAX1662EUB+T powers up with all three I/O pins in high-impedance state, ensuring P-channel MOSFETs remain off until explicitly configured via SMBus. This behavior enforces safe power sequencing in multi-rail systems and prevents unintended current flow during boot. The power-on reset threshold is 2.7V, and the POR delay is typically 10µs at 5.5V.

How does the SMBSUS pin affect MAX1662EUB+T operation?

The SMBSUS pin on the MAX1662EUB+T selects between two internal data registers: low selects the suspend-mode register, high selects the normal-mode register. This allows the host to pre-load alternate power configurations and switch between them asynchronously-bypassing SMBus latency. The register contents determine I/O output states, interrupt masks, and suspend-mode logic.

Can MAX1662EUB+T drive N-channel MOSFETs?

No, the MAX1662EUB+T is intended for P-channel MOSFETs only. Its outputs are high-impedance at power-up and drive low to turn on P-MOSFETs. The MAX1661EUB+T variant is specified for N-channel MOSFETs and powers up with outputs low. Using MAX1662EUB+T with N-MOSFETs would require external level-shifting and violates the intended circuit role defined in the datasheet.

What happens when thermal shutdown triggers on MAX1662EUB+T?

When die temperature reaches 140°C, MAX1662EUB+T asserts the ALERT pin low and latches the THSD bit in the receive-byte status register. This interrupt cannot be masked. The I/O outputs remain in their last commanded state unless manually disabled via SMBus. Recovery requires clearing the interrupt via Alert Response address (0001100) and verifying thermal conditions before re-enabling loads.

Is MAX1662EUB+T compatible with standard SMBus v1.1 timing?

Yes, MAX1662EUB+T meets SMBus v1.1 timing requirements: tSU:STA ≥4µs, tHD:STA ≥4µs, tLOW ≥4.7µs, tHIGH ≥4µs, and tBUF ≥4.7µs. Its Schmitt-triggered SMBCLK/SMBDATA inputs tolerate slow edges, and it supports clock frequencies from DC to 100kHz. START-STOP interrupts and Alert Response addressing are fully compliant with SMBus interrupt handling protocols.