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Dual-Channel Cardbus and PCMCIA Power Switches with SMBus Serial Interface

Handles 1A for 2 Slots without External Components, Tiny SSOP Package

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Supports Two CardBus Sockets
  • 1A, 0.08Ω Max VY VCC Switch (MAX1601 only)
  • 1A, 0.14Ω Max VX VCC Switch
  • Soft Switching for Low Inrush Surge Current
  • Overcurrent Protection
  • Overcurrent/Thermal-Fault Flag Output
  • Thermal Shutdown at Tj = +150°C
  • Independent Internal Charge Pumps
  • Break-Before-Make Switching Action
  • 10µA Max Standby Supply Current
  • 5V and 12V Not Required for Low-RDS(ON) 3.3V Switching
  • Complies with PCMCIA 3V/5V Switching Specifications
  • Super-Small, 28-Pin SSOP Package (0.2in. or 5mm wide)
  • System Management Bus (SMBus) Serial Interface

Applications/Uses

  • Computers: Desktop, Workstation, Server
  • Data Logging
  • Digital Still Cameras
  • Docking Stations
  • Handy Terminals
  • Notebook Computers
  • PCMCIA Read/Write Drives
  • Printers

Description

The MAX1601/MAX1604 DC power-switching ICs contain a network of low-resistance MOSFET switches that deliver selectable VCC and VP-P voltages to two CardBus or PC Card host sockets. Key features include ultra-low-resistance switches, small packaging, soft-switching action, and compliance with PCMCIA specifications for 3V/5V switching. 3.3V-only power switching for fast, 32-bit CardBus applications is supported in two ways: stiff, low-resistance 3.3V switches allow high 3.3V load currents (up to 1A); and completely independent internal charge pumps let the 3.3V switch operate normally, even if the +5V and +12V supplies are disconnected or turned off to conserve power. The internal charge pumps are regulating types that draw reduced input current when the VCC switches are static. Also, power consumption is automatically reduced to 10µA max when the switches are programmed to high-Z or GND states over the serial interface, unlike other solutions that may require a separate shutdown-control input.

Other key features include guaranteed specifications for output current limit level, and guaranteed specifications for output rise/fall times (in compliance with PCMCIA specifications). Reliability is enhanced by thermal-overload protection, accurate current limiting, an overcurrent-fault flag output, undervoltage lockout, and extra ESD protection at the VCC/VP-P outputs. The SMBus™ serial interface is flexible, and can tolerate logic input levels in excess of the positive supply rail.

The MAX1604 and MAX1601 are identical, except for the MAX1604's VY switch, which has roughly three-times the on-resistance (typically 140mΩ). The MAX1601/MAX1604 fit two complete CardBus/PCMCIA switches into a space-saving, narrow (0.2in. or 5mm wide) SSOP package.

Simplified Block Diagram

MAX1601, MAX1604: Pin Configuration MAX1601, MAX1604: Pin Configuration 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 .