LTC1555/LTC1556 SIM Power Supply and Level Translator FEATURES s s s DESCRIPTION The LTC®1555/LTC1556 provide power conversion and level shifting needed for 3V GSM cellular telephones to interface with either 3V or 5V Subscriber Identity Modules (SIMs).
These parts contain a charge pump DC/DC converter that delivers a regulated 5V to the SIM card.
Input voltage may range from 2.
7V to 10V, allowing direct connection to the battery.
Output voltage may be programmed to 3V, 5V or direct connection to the VIN pin.
A soft start feature limits inrush current at turn-on, mitigating start-up problems that may result when the input is supplied by another low power DC/DC converter.
The LTC1556 also i...

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