Diodes Incorporated

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Single SIM/Smart Card Power Supply and Level Translation

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Product Description

The PI4ULS5V4555 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 3V and 6V input. The output voltages can be set using a single selection pin and up to 50mA of load current can be supplied. 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
  • SIM Power Supply 1.8V/3V at 50mA
  • Input Voltage Range: 3V to 6V
  • Controller Voltage Range: 1.4V to 3.6V
  • Automatic Level Translation
  • Built-In Fault Protection Circuitry
  • Meets all ETSI, IMT-2000 and ISO7816 SIM/Smart Card Interface Requirements
  • 40µA Operating Current
  • Low Operating/Shutdown Current
  • >8kV ESD on SIM Card Pins
  • Meets EMV Fault Tolerance Requirements
  • Packaging (Pb-free & Green): 16-Lead QFN3x3


  • 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) 3.3 to 2.5
Translation To (V) 2.5 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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