Datasheet Linear Technology LTC4557 — 数据表

LTC4557
Dual SIM/Smart Card
Power Supply and Interface U FEATURES
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в–  DESCRIPTIO The LTCВ®4557 provides power conversion and signal level
translation needed for 2.5G and 3G cellular telephones to
interface with 1.8V or 3V subscriber identity modules
(SIMs). The part meets all requirements for 1.8V and 3V
SIMs. The part 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. Power Management and Signal Level Translators
for Two SIM Cards or Smart Cards
Independent 1.8V/3V VCC Control for Both Cards
Automatic Level Translation
ISO7816, ETSI and EMV Compatible …