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Voltage rise fall chip

TX9123

TX9123  (停产) (stop production)

    The TX9123 using the external NMOSFET. It is a high efficiency boost converter with 600mV feedback voltage. A switching frequency of 550KHz minimizes solution footprint by allowing the use of tiny low profile inductors and ceramic capacitors.

    The current mode PWM/PFM design is internally compensated, and the device has a 1.6V startup voltage with 1mA load. It needs few external components, only inductance, resistance and capacitance can meet the driving capacity.

    TX9123  (停产) (stop production)

    TX9123 General Description:
        The TX9123 using the external NMOSFET. It is a high efficiency boost converter with 600mV feedback voltage. A switching frequency of 550KHz minimizes solution footprint by allowing the use of tiny low profile inductors and ceramic capacitors.
        The current mode PWM/PFM design is internally compensated, and the device has a 1.6V startup voltage with 1mA load. It needs few external components, only inductance, resistance and capacitance can meet the driving capacity.

    TX9123 Features:
    Min1.6V Startup @1mA Load
    600mV Feedback Voltage
    550KHz Internal Oscillator
    Soft Startup: 10mS Typical
    Peak Current Programmable by Bottom Sensing Resistor
    300μA Typical Iq
    Internal PWM/PFM Auto Mode Switching
    Up to 90% Efficiency l External Enable
    Power OFF Current<1μA
    Over Voltage Protection
    140℃ Thermal Shut Down, 20℃ Hysteresis

    TX9123 Applications:
    USB Charger

    TX9123 Block Diagram:

    TX9123 Pin Assignment:

    TX9123 Application Circuits
    1) Power supply tied to VOUT

    2) Power supply tied to VIN(VIN>2.8V)

    3) External Component Recommendation:
      1) Rlim=50mOhm *(2)
      2) Cin=22uF
      3) Cout=10uF *(1)
      4) L=2.2uH
      5) CF=0.1uF
      *(1) Cout needs to increase when reducing Rlim value. For example, Rlim=25mOh -> Cout=20uF
      *(2) Selection table
    Test Condition: Vin=3.3V, Vout=5V, L=3.3uH
    Rlim (mOhm)
    Max load current (A)
    200
    0.5
    100
    1
    50
    2
    25
    3












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