NJW4175 Series
2.1MHz, 600mA MOSFET Switching Regulator IC for Synchronous Buck Converter

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  • Description

    The NJW4175 is a high speed oscillating frequency buck converter with 40V/600mA MOSFET. The NJW4175 have PWM/PFM mode to ensure high efficiency at light load. Operating voltage range is wide input range from 3.4V to 40V. Moreover, 100% maximum duty cycle contribute to maintain stable output voltage even if supply voltage drops. Internal protection functions: UVLO, an over current protection and a thermal shutdown circuit can protect circuit when abnormal condition. The NJW4175 has wide coverage in consumer electronics and industrial application, because of features that are wide input range, fixed output voltage type, high switching oscillating frequency and 100% maximum duty cycle.


    • Power supply for camera
    • Low power buck converter
    • Industrial equipment

  • Spec
    Input Voltage Range 3.4 V to 40 V (45 V)
    Operating Temperature Range -40°C to 125°C
    Supply Current Typ. 500 µA
    Standby Current 3 (max.) µA
    Output Voltage Range 0.8 V to 26 V
    Output Voltage Accuracy ± 1 %
    Output Current 600 mA
    Oscillator Frequency Typ. 2.1MHz
    Maximum Duty Cycle 100%
    Package HSOP8-M1
    制御 Current Mode Control / PWM Control
    機能 Standby Function
    Soft Start Function 4ms typ.
    Over Current Protection (Hiccup type)
    Thermal Shutdown Protection
    Power Good Function
    備考 Built-in Compensation Circuit
    UVLO (Under Voltage Lockout)
    Correspond to Ceramic Capacitor (MLCC)

    Protections / Functions

    TSD ILX OCP OVP UVLO OVLO Reverse Shutdown Soft Start SSCG PGOOD Auto Discharge Anti-ringing Sequencing Max Duty Ext. Phase LED Adjust
  • Technical
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  • 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

TSD Thermal Shutdown Function
ILX LX Current Limit Function
OCP Overcurrent Protection
OVP Overvoltage Protection
UVLO Undervoltage Lockout Protection
OVLO Overvoltage Lockout Protection
Reverse Reverse Current Protection Circuit
Shutdown Shutdown Function
Soft Start Soft Start Function
SSCG Spread Spectrum Clock Generator Function
PGOOD Power Good Output
Auto Discharge Auto Discharge Function
Anti-ringing Anti-ringing Switch Function
Sequencing Start-up Sequencing Control
Max Duty Maximum Duty Cycle
Ext. Phase Externally Adjustable Phase Compensation
LED Adjust LED High-speed Dimming Control

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