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LTC4558 Key Features

  • Power Management and Control for Two SIM Cards or Smart Cards
  • Independent 1.8V/3V VCC Control for Both Cards
  • Supports Simultaneous Powering of Both Cards
  • Fast Channel Switching
  • Automatic Level Translation
  • Dynamic Pull-Ups Deliver Fast Signal Rise Times
  • Built-In Fault Protection Circuitry
  • Automatic Activation/Deactivation Sequencing
  • Low Operating/Shutdown Current
  • > 10kV ESD on SIM Card Pins

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LTC4558 Description

The LTC®4558 provides the power conversion and signal level translation needed for advanced cellular telephones to interface with 1.8V or 3V subscriber identity modules (SIMs). The device meets all requirements for 1.8V and 3V SIMs and contains LDO regulators to power 1.8V or 3V SIM cards from a 2.7V to 5.5V input. The output voltages can be set using the two voltage selection pins and up to 50mA of load current can...