Analog Devices Inc./Maxim Integrated MAX1662EUB

Overview

MAX1662EUB from Maxim Integrated is a 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, SMBus 2-wire interface, high-impedance power-up state, and thermal/overcurrent protection. It is used to control point-of-load power-bus switching in notebook computers.

For engineers reviewing the MAX1662EUB datasheet, MAX1662EUB pinout, MAX1662EUB application, or MAX1662EUB equivalent, this page delivers verified functional identity, confirmed SMBus address (0100001), validated 10-pin µMAX package mapping, exact power-on reset behavior (high-impedance outputs), and real-world use in battery voltage-distribution switching with asynchronous SMBSUS register selection.

Technical Context

The MAX1662EUB implements a dual-register SMBus architecture where SMBSUS selects between normal-mode and suspend-mode data registers-enabling asynchronous power-plane reconfiguration without serial bus latency. Its I/O pins operate as open-drain outputs or TTL-level inputs, each rated to +28V and internally current-limited to 50mA.

It uses a static SMBus logic block compliant with Intel SMBus v1.1 timing, supports hardware interrupts via active-low open-drain ALERT, and provides software-initiated START-STOP interrupts. Power-on reset ensures all three I/Os start in high-impedance state to enforce safe power sequencing for P-channel MOSFETs.

Key Specifications

Pinout & Package

MAX1662EUB is housed in a space-saving 10-pin µMAX package (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed pad (not electrically connected). The package supports reflow soldering and meets JEDEC MO-187AC standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX1661EUB and MAX1663EUB, the MAX1662EUB offers the specific SMBus address 0100001 and is the designated variant for single-device P-channel load switching where deterministic address assignment and guaranteed high-impedance startup are required.

Availability

MAX1662EUB is available at Aetrix Electronics and suitable for notebook computer power management, point-of-load switching, and smart battery distribution requiring stable component supply across extended product lifecycles.

Supply support for MAX1662EUB 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 and mixed-signal ICs for power, sensing, and connectivity applications.

The MAX166x family was designed specifically for SMBus-controlled power-plane sequencing in portable computing-delivering low-power, high-voltage I/O capability and dual-register flexibility for dynamic power management.

FAQ

What is the power-up behavior of the MAX1662EUB I/O pins?

The MAX1662EUB I/O pins (I/O1–I/O3) power up in high-impedance state, ensuring P-channel MOSFETs remain off until explicitly enabled via SMBus command. This behavior is hardwired and applies to both normal and suspend registers. The MAX1662EUB does not assert any output state at POR-eliminating risk of unintended power rail activation during boot.

Which SMBus address does the MAX1662EUB use, and how is it set?

The MAX1662EUB uses SMBus address 0100001 (binary) when the ADD pin is tied to GND at power-on reset. This address is latched permanently until the device is power-cycled; floating or VCC-connected ADD pins yield different addresses (0111101 or 1001001). The MAX1662EUB address is fixed per hardware configuration and cannot be changed dynamically.

Can the MAX1662EUB drive N-channel MOSFETs?

No-the MAX1662EUB is specifically intended for P-channel MOSFETs due to its high-impedance power-up state and register logic optimized for high-side switching. Driving N-channel MOSFETs requires active-low outputs at startup, which is provided by the MAX1661EUB-not the MAX1662EUB. Using MAX1662EUB with N-MOSFETs risks undefined or unsafe power sequencing.

How does the SMBSUS pin affect MAX1662EUB operation?

The SMBSUS pin on the MAX1662EUB selects between two independent data registers: driving SMBSUS low activates the suspend-mode register, while high selects the normal-mode register. This allows the host to pre-load alternate power configurations and switch between them asynchronously-bypassing SMBus transaction latency. The MAX1662EUB executes the selected register's I/O states immediately upon SMBSUS transition.

Does the MAX1662EUB provide thermal protection, and how is it reported?

Yes-the MAX1662EUB includes thermal shutdown protection triggering at 140°C. When activated, it asserts the open-drain ALERT pin low and sets the THSD bit (bit 3) in the receive-byte status register. This fault is latched and persists until cleared via Alert Response address (0001100) read-ensuring reliable detection even in transient thermal events. The MAX1662EUB does not auto-recover after cooling; host firmware must verify and re-enable.