Card power chip meets smart and SIM standards

The LTC4557 is a dual SIM/smart-card power supply and level translator, which provides both 1.8 and 3V SIM power and digital signal level shifting from a 3 x 3mm QFN package.

The LTC4557 is a dual SIM/smart-card power supply and level translator, which provides both 1.8 and 3V SIM power and digital signal level shifting from a 3 x 3mm QFN package.

It provides power and level shifting for 2.5G/3G wireless applications which are required to interface with either a 1.8 or 3V subscriber identity module (SIM) or smart card.

The LTC4557 can withstand 10kV ESD on all the SIM contact pins and meets all ETSI, EMV and ISO7816 SIM/smart-card approval requirements.

Its tiny 16-lead QFN package has only a 0.75mm profile, making it ideal for space-constrained applications.

The LTC4557 contains an LDO regulator to supply SIM power at either 1.8 or 3V from a 3 to 6V input.

The SIM/smart-card voltage is selected by the baseband controller via a single pin (each channel), enabling the device to deliver up to a 50mA of load current.

Internal level translators allow controllers operating with supply voltages from 1.2 to 4.4V to interface with 1.8 or 3V SIM cards.

Finally, a very low operating current of 100uA (below 1uA in shutdown) ensures optimal battery life.

The combination of a very small solution footprint and low supply current make it ideal for battery-powered wireless applications.

LTC2557EUD is available from stock in a 16-lead QFN package; 1000-piece pricing starts at $2.50 each.

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