National Semiconductor | High-performance Analog


 LM3351   

Switched Capacitor Voltage Converter [Obsolete]
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Features

  • Conversion of 3.3V to 5V, or 5V to 3.3V
  • 200 kHz switch frequency allows use of very small, inexpensive capacitors.
  • 4.2Ω typical step-up output impedance
  • 1.8Ω typical step-down output impedance
  • 95% typical power conversion efficiency at 50 mA
  • 250 nA typical shutdown current
  • No inductor required
  • Low quiescent current extends battary life
  • Small Mini SO-8 package
  • Description

    The LM3351 is a CMOS charge-pump voltage converter which efficiently provides a 3.3V to 5V step-up, or 5V to 3.3V step-down. The LM3351 is pin for pin compatible with the LM3350 but consumes 66% less quiescent current. The LM3351 uses four small, low cost capacitors to provide the voltage conversion. It eliminates the cost, size and radiated EMI related to inductor based circuits, or the power loss of a linear regulator. Operating power conversion efficiency greater than 90% provides ideal performance for battery powered portable systems.

    The architecture provides a fixed voltage conversion ratio of 3/2 or 2/3. Thus it can be used for other DC-DC conversions as well.


    Applications

  • Any mixed 5V and 3.3V system
  • Laptop computers and PDAs
  • Handheld instrumentation
  • PCMCIA cards



  • Typical Application
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    Connection Diagram
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    Typical Performance
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    Datasheets
    TitleSizeDateOther
    Language
    LM3351 Switched Capacitor Voltage Converter313
    Kbytes
    22-Sep-11日本語  

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM3351MM
    NONE
    NONE
    30 Nov 2009
    LM3351MMX
    NONE
    NONE
    30 Nov 2009

    [Information as of 9-Feb-2012]