Diodes Incorporated
SO 8

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AP1609 (Obsolete)


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The AP1609 is a high efficient step-up DC/DC converter. Large output current is possible having a built in internal N channel MOSFET, and using an external coil and diode. Output voltage is programmable with 1.23V of standard voltage supply internal, and using externally connected components, output voltage (FB) can be set up at will. With a 300KHz switching frequency, the size of the external components can be reduced. Control switches from PFM to PWM during light loads with the AP1609 (PWM/PFM switchable) and the series are highly efficient from light loads to large output currents. During stand-by time (CE pin “Low”), current consumption is reduced to 1µA.


  • Input Voltage Range: 2.5~6V
  • Output Voltage Range: 3.0~17V (±2.5%)
  • PWM/PFM Switching Control
  • Oscillator Frequency: 300KHz (±20%)
  • High Efficiency: 91% (Typ.)
  • Stand-by Current: ISTB 1 = μA (Typ.)
  • Built-in internal N-Channel MOS
  • Lead Free Package: SO-8
  • SOP-8L: Available in “Green” Molding Compound (No Br, Sb)
  • Lead Free Finish/ RoHS Compliant
  • Application(s)

  • Electronic Information Organizers
  • Palmtops
  • Cellular and Portable Phones
  • Portable Audio Systems
  • Various Multi-Function Power Supplies
  • Product Specifications

    Product Parameters

    Efficiency (%) 91
    Frequency Typ (Hz) 300K
    HS RDS(ON) (mΩ) N/A
    LS RDS(ON) (mΩ) 100
    MaximumInput Voltage (V) 6
    Maximum Output Voltage (V) 17
    MinimumInput Voltage (V) 2.5
    Minimum Output Voltage (V) 3
    Output Current (mA) 2.4
    Quiescent Current Typ (mA) 0.08
    Shutdown Current Typ (µA) 1
    Type Boost

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