Diodes Incorporated

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Dual SIM/Smart Card Power Supply and Interface Signal Switch

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Product Description

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
  • Independent 1.8V/3V VCC Control for Both Cards
  • Supports Simultaneous Powering of Both Cards
  • Fast channel Switching
  • Automatic Level Translation
  • Fast rise time by current pull up
  • Built-In Fault Protection Circuitry
  • Automatic Activation/Deactivation Sequencing
  • Low Operating/Shutdown Current
  • >8kV ESD on SIM Card Pins
  • Meets EMV Fault Tolerance Requirements
  • Packaging (Pb-free & Green): 16-Lead TQFN3x3


  • GSM, TD-SCDMA and other 3G+ Cellular Phones
  • Wireless Point-to-Sale Terminals
  • Multiple SIM Card Interfaces

Product Specifications

Product Parameters

Type Fixed-direction Voltage Translators
Compliance (Only Automotive supports PPAP) Standard
Translation From (V) 2.7 to 5
Translation To (V) 3.3 to 1.8
Max Signal Rate 10Mhz
Bits Needed 4
Auto-direction Voltage Translators Sensing? No
Prop Delay N/A
Ambient or Junction Temperature (°C) -40 to 85

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