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


Package | PIN: RUK | 20
Temp: I (-40 to 85)
Carrier: Cut Tape
Qty Price
1-9 $1.89
10-24 $1.70
25-99 $1.58
100-249 $1.39
250-499 $1.30
500-749 $1.10
750-999 $0.93
1000+ $0.89


  • Level Translator
    • VCC Range of 1.65 V to 3.3 V
    • VBATT 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)

Texas Instruments  TXS4558RUKR

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.