LTC4558

PRODUCTION

Dual SIM/Smart Card Power Supply and Interface

Part Models: 2
1ku List Price: Starting From $2.28

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Overview

Power Management and Control for Two SIM Cards or Smart Cards
Independent 1.8V/3V V_CC 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

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.

Applications

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

Part Models: 2
1ku List Price: Starting From $2.28

Documentation

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4558EUD#PBF	20-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4558EUD#TRPBF	20-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys