Features and Benefits

  • SIM Power Supply: 1.8V/3V at 50mA
  • Input Voltage Range: 3V to 6V
  • Controller Voltage Range: 1.2V to 4.4V
  • 14kV ESD on all SIM Contact Pins
  • Meets all ETSI, IMT-2000 and ISO7816 SIM/Smart Card Interface Requirements
  • Level Translators to 1.8V or 3V
  • 20µA Operating Current
  • Logic Controlled Shutdown (ISD < 1µA)
  • Available in 0.75mm Profile, 3mm x 3mm QFN Package

Product Details

The LTC4555 provides power conversion and signal level shifting needed for low voltage 2.5G and 3G cellular telephones to interface with 1.8V or 3V subscriber identity modules (SIMs). The part meets all type approval requirements for 1.8V and 3V SIMs and smart cards. The part contains an LDO linear regulator to supply SIM power at either 1.8V or 3V from a 3V to 6V input. The output voltage is selected with a single pin and up to 50mA of load current can be supplied.

Internal level translators allow controllers operating with supplies as low as 1.2V to interface with 1.8V or 3V smart cards. Battery life is maximized by 20µA operating current and <1µA shutdown current. Board area is minimized by the 3mm x 3mm leadless QFN package.


  • SIM Interface in 3G Cellular Telephones
  • Smart Card Readers

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Sample & Buy

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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