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The PI4ULS5V4557 provides the power conversion and signal level translation needed for advanced (2.5G and 3G) cellular telephones to interface with 1.8V and 3V subscriber identity modules (SIMs). The device meets all requirements for 1.8V or 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 voltage selection pins and up to 50mA of load current can be supplied. A channel select pin determines which channel is open for communication.
Internal level translators allow controller operating with supplier as low as 1.4V to interface with 1.8V or 3V Smart Cards. Battery life is maximized by a low operating current of 40μA and a shutdown current of less than 1μA.
Power Management and Control for two SIM Cards or Smart Cards