TXS4558 - Dual SIM card power supply with level translator and dedicated dual LDO

The TXS4558 is a complete dual-supply standby Smart Identity Module (SIM) card solution for interfacing wire-less baseband processors with two individual SIM subscriber cards to store data for mobile handset applications. It is a custom device which is used to extend a single SIM/UICC interface to be able to support two SIM’s/UICC’s.

The device complies with ISO/IEC Smart-Card Interface requirements as well as GSM and 3G mobile standards. It includes a high-speed level translator capable of supporting Class-B (2.95 V) and Class-C (1.8 V) interfaces, two low-dropout (LDO) voltage regulators that have output voltages that are selectable between 2.95-V Class-B and 1.8-V Class-C interfaces. Simple GPIO inputs are used to switch between the two SIM cards and to put it into different modes. The voltage-level translator has two supply voltage pins. VCC sets the reference for the baseband interface and can be operated from 1.65 V to 3.3 V. VSIM1 and VSIM2 are programmed to either 1.8 V or 2.95 V, each supplied by an independent internal LDO regulator. The integrated LDO accepts input battery voltages from 2.3 V to 5.5 V and outputs up to 50 mA to the B-side circuitry and external Class-B or Class-C SIM card.

The TXS4558 also incorporates shutdown sequence for the SIM card pins based on the ISO 7816-3 specification for SIM cards. The device also has 8kV HBM protection for the SIM card pins and standard 2kV HBM protection for all the other pins.

Products containing the "TXS4558" keyword are: TXS4558EVM , TXS4558EVM , TXS4558RUKR , TXS4558RUKR

• Level Translator
  • V_CC Range of 1.65 V to 3.3 V
  • V_BATT Range of 2.3V to 5.5V
• Low-Dropout (LDO) Regulator
  • 50-mA LDO Regulator With Enable
  • 1.8-V or 2.95-V Selectable Output Voltage
  • Very Low Dropout: 100 mV (Max) at 50 mA
• Control and Communication Through GPIO Interface with Baseband Processor
• Isolated Clock Stop Mode for both SIM1 and SIM2 cards
• ESD Protection Exceeds JESD 22
  • 2000-V Human-Body Model (A114-B)
  • 500-V Charged-Device Model (C101)
  • 8kV HBM for SIM pins
• Package
  • 20-Pin QFN (3 mm x 3 mm)