NJW4203 Series
Spread Spectrum Modulation (SSFM) Oscillator IC with External Synchronization for Switching Regulators

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  • Description

    The NJW4203 is an oscillator with spread spectrum frequency modulation (SSFM) that outputs two types of antiphase shifted by 0° or 180°. The SSFM reduces the peak noise level of EMI. The output clock spreads the frequency at ±4.4% of the center frequency, and the modulation rate can be selected from fCLK/2048, fCLK/512, or fCLK/128. In addition, a PLL control system improves the stability of the output clock. The NJW4203 operates from 120 kHz to 2.4 MHz, and is suitable for the external synchronization signal application of the switching regulators.


    • External synchronization signal of switching regulator

  • Spec
    Supply Voltage 2.7V to 5.5V
    Frequency Range 120kHz to 2400kHz
    Frequency Spreading ±4.4%
    Number of Outputs 2
    Structure Bi-CMOS Technology
    Wide Operating Temperature -40℃ to +125℃
    Junction Temp. +150℃
    Package MSOP8(VSP8)
    Anti-phase outputs to reduce ripple current 0° , 180°
    Selectable modulation rate fCLK/2048, fCLK/512, fCLK/128
    Note SSFM for improved EMI performance
    Frequency spreading (±4.4%)
    Standby function
  • Technical
  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file or the datasheet includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.

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Functional Description

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