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Power supply chip controls two SIM or smart cards

Milpitas, Calif.—Linear Technology has developed a dual subscriber identity module (SIM) and smart card power supply IC, designated the LTC4558, that features fast channel transition.

The LTC4558 has a level translator that provides both 1.8V and 3V SIM power and digital signal level shifting in a 3-mm x 3-mm QFN package.

The LTC4558 is suitable for GSM, TD-SCDMA and other 3G+ wireless applications that interface with either a 1.8V or 3V SIM or smart card. A channel-select pin determines which channel is open for communication, while separate enable pins allow both cards to be powered at once and provide fast transition from one channel to the other.

The LTC4558 can withstand >10kV ESD on all of the SIM contact pins and is designed to meet all ETSI, EMV and ISO7816 SIM/Smart card approval requirements. Its 20-lead QFN package has a tiny 0.75mm profile for space-constrained applications.

Pricing: Starts at $1.55 each in 1,000-piece quantities
Availability: From stock
Data Sheet: Click here

Linear Technology Corp., 1-408-432-1900, www.linear.com.

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