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Micropower, Low Noise Boost Converters with Integrated Schottky Diode in 3mm × 2mm DFN Package

Nov 29 2006 - MILPITAS, CA
  • Linear Technology Corporation announces the LT3494/A low noise boost converters with integrated power switches, Schottky diodes and output disconnect circuitry. The LT3494 uses a 180mA switch, the LT3494A uses a 350mA switch, and both parts are packaged in a 3mm × 2mm DFN-8 package. Their wide 2.3V to 16V input voltage range enables operation from single cell Li-Ion batteries up to fixed 12V input rails, delivering outputs up to 40V. The LT3494 can deliver over 17mA of current at 15V from a single Li-Ion cell, making it ideal for applications such as OLED displays. The LT3494A has higher current capability and can deliver over 27mA of current at 15V from a single Li-Ion cell. Both parts use a unique control technique that delivers both high efficiency and low output ripple over a wide load current range. This technique guarantees that the switching frequency stays above the audio band for the entire load range, making it ideal for noise-sensitive applications such as MP3 players. The combination of the LT3494/A's 3mm × 2mm DFN package and tiny, low cost ceramic capacitors and inductors provides a very compact solution footprint.

    The LT3494's NPN switch achieves a VCESAT of only 110mV at 100mA, offering efficiencies as high as 80%. Only 65uA of quiescent current (<1uA in shutdown) maximizes battery run-time while integrated Schottky diodes and output disconnect circuitry eliminates costly external circuitry. Finally, an integrated dimming/contrast adjustment function is included for display applications. 

    The LT3494EDDB and LT3494AEDDB are both available from stock in an 8-lead 3mm × 2mm DFN package. Pricing starts at $1.45 each for 1,000-piece quantities.

    Summary of Features: LT3494/A

    • Low Quiescent Current: 65 uA in Active Mode (0.1uA in Shutdown Mode)
    • Switching Frequency is Non-Audible Over Entire Load Range
    • Integrated Power NPN:
      • 350mA Current Limit (LT3494A)
      • 180mA Current Limit (LT3494)
    • Integrated Schottky Diode
    • Integrated Output Disconnect
    • Integrated Output Dimming
    • Wide Input Range: 2.3V to 16V
    • Wide Output Range: Up to 40V
    • Tiny 8-Lead 3mm × 2mm DFN Package

    Micropower Low Noise Boost Converts with Output Disconnect

    LT3494A PR Image

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