Interface SIM Interface

LTC4558 - Dual SIM/Smart Card Power Supply and Interface

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 Circuitry
  • Low Operating/Shutdown Current
  • > 10kV ESD on SIM Card Pins
  • Meets EMV Fault Tolerance Requirements
  • Low Profi le 20-Lead (3mm × 3mm) QFN Package

Typical Application

LTC4558 Typical Application
LTC4558 Typical Application

Description

The LTC4558 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 be supplied. A channel select pin determines which channel is open for communication. Separate enable pins for each channel allow both cards to be powered at once and allow for faster transition from one channel to the other.

Internal level translators allow controllers operating with supplies as low as 1.4V to interface with 1.8V or 3V Smart Cards. Battery life is maximized by a low operating current of 65µA and a shutdown current of less than 1µA. Board area is minimized by the low profi le 3mm × 3mm × 0.75mm leadless QFN package.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-20

LTC4558 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC4558EUD#PBF QFN 20 E $2.21 $1.55 View
LTC4558EUD#TRPBF QFN 20 E $1.61 View
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* 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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1263A LTC4558EDU | Dual SIM Smart Card Power Supply and Interface Contact Factory
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Click here to view our complete list of demo boards

Applications

  • GSM, TD-SCDMA and other 3G+ Cellular Phones
  • Wireless Point-of-Sale Terminals
  • Multiple SIM Card Interfaces

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