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Serial to Parallel Parallel to Serial Converters and Load Switch Controllers with SMBus Interface

SMBus Interfaced Controller Simplifies Power Plane Switching

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Performs Serial-to-Parallel and Parallel-to-Serial Conversions
  • Three General-Purpose Digital Input/Output Pins (withstand +28V)
  • SMBus 2-Wire Serial Interface
  • Supports SMBSUS-bar Asynchronous Suspend Mode
  • 3µA Supply Current
  • +2.7V to +5.5V Supply Range
  • Space-Saving, Low-Cost 10-Pin µMAX Package

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • Notebook and Subnotebook Computers
  • Point-of-Load Power-Bus Switching
  • Power-Plane Switching
  • Smart Battery Packs/Chargers

Description

The MAX1661/MAX1662/MAX1663 serial-to-parallel/parallel-to-serial converters are intended to control external power MOSFETs in power-plane switching applications. These small, low-cost devices can be used on a system motherboard to control point-of-load switching from a 2-wire SMBus™ serial interface. Each device has three high-voltage open-drain outputs that double as TTL-level logic inputs, giving them bidirectional capabilities. The I/O pins can withstand +28V, so they can control battery voltage-distribution switches in notebook computers.

The MAX1661 is intended for driving N-channel MOSFETs and its outputs are low upon power-up. The MAX1662/MAX1663 are intended for P-channel MOSFETs, and their outputs are high-impedance upon power-up. This ensures that the MOSFETs are off at power-up, so the system can enforce power-plane sequencing.

The active-low SMBSUS control input selects control data between two separate data registers. This feature allows the system to select between two different power-plane configurations asynchronously, eliminating latencies introduced by the serial bus. Other features include thermal-overload and overcurrent protection, ultra-low supply current, and both hardware and software interrupt capabilities. These devices are available in the space-saving 10-pin µMAX® package.

Simplified Block Diagram

MAX1661, MAX1662, MAX1663: Typical Operating Circuits MAX1661, MAX1662, MAX1663: Typical Operating Circuits Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .