NJW4171 Series
2.4MHz, 2.5A MOSFET Switching Regulator IC for Buck Converter

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  • Description

    The NJW4171 is a high speed oscillating frequency buck converter with 40V/2.5A MOSFET. It has two lineup: the A version has PWM/PFM mode to ensure high efficiency at light load, the B version is forced PWM mode. Operating voltage range is wide input range from 3.4V to 40V, it can correspond to supply voltage drop such as cold crank. Moreover, 100% maximum duty cycle contribute to maintain stable output voltage even if supply voltage drops. The NJW4171 has wide switching oscillating frequency range, 100kHz to 2.4MHz and internal external clock synchronization function. Therefore the NJW4171 can avoid interference with the AM radio frequency. Internal protection functions: UVLO, an over current protection and a thermal shutdown circuit can protect circuit when abnormal condition. The NJW4171 has wide coverage in consumer electronics and industrial application, because of features that are wide input range, wide switching oscillating frequency range and 100% maximum duty cycle.

    * Automotive: AEC-Q100 grade 1 in progress


    • Consumer Electronics
    • Industrial Equipment
    • High voltage to logic and microprocessor power supplies

  • Spec
    Consumer Automotive
    Input Voltage Range 3.4 V to 40 V (45 V)
    Operating Temperature Range -40°C to 125°C
    Supply Current Typ. 120 µA Max. 165 µA
    Standby Current 3 (max.) µA 4 (max.) µA
    Output Voltage Range 0.8 V to 38 V
    Output Voltage Accuracy ± 1 % ± 2 %
    Output Current 2500 mA
    Oscillator Frequency High 100kHz to 2.4MHz
    Maximum Duty Cycle 100%
    Package HSOP8-M1
    Control Current Mode Control / PWM Control
    Function Standby Function
    Soft Start Function (2ms typ.)
    Over Current Protection (Hiccup type)
    Thermal Shutdown Protection
    Power Good Function
    Note UVLO (Under Voltage Lockout)
    External Compensation Circuit
    Correspond to Ceramic Capacitor (MLCC)
    If you need datasheets of this
    product, please contact us.
    AEC-Q100 AEC-Q100 grade 1 in progress

    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
    • SPICE model download

      You can download the product's SPICE model. Login/registration to myNISD is required to download.

    • Related Links

      • Prime Designer

        Online Design Tool

        Registration to myNISD is required to use some of the functions, such as simulations.

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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.

Download Datasheet

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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