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TXS4555
www.ti.com SBOS550B – FEBRUARY 2011 – REVISED AUGUST 2013 1.8V/3V SIM Card Power Supply With Level Translator
Check for Samples: TXS4555 FEATURES 1 3 NC 4 11 SIMCLK 10 GND 9 SIMRST NC I/O RST CLK 16 15 14 13 Note: The Exposed center thermal pad must be
connected to Ground
RUT Package
(Top View) EN I/O RST CLK SIMCLK 10 9 8 7 2 3 4 5 VBATT VSIM SIMI/O SIMRST 6 1 12 VCC SEL 11 DESCRIPTION
The TXS4555 is a complete Smart Identity Module
(SIM) card solution for interfacing wireless baseband
processors with a SIM card to store I/O for mobile
handset applications. The device complies with
ISO/IEC Smart-Card Interface requirements as well
as GSM and 3G mobile standards. It includes a highspeed level translator capable of supporting Class-B
(2.95 V) and Class-C (1.8 V) interfaces, a lowdropout (LDO) voltage regulator that has output
voltages that are selectable between 2.95-V Class-B
and 1.8-V Class-C interfaces. NC 8 VCC Exposed
Thermal Pad 12 SIMI/O 2 7 SEL VSIM 1 6 EN NC RGT Package
(Top View) 5 Level Translator
– VCC Range of 1.65 V to 3.3 V
– VBATT Range from 2.3 to 5.5V
Low-Dropout (LDO) Regulator
– 50-mA LDO Regulator With Enable
– 1.8-V or 2.95-V Selectable Output Voltage
– 2.3-V to 5.5-V Input Voltage Range …
