NJW4170 Series
Current Mode Control High Speed Frequency Internal 1A MOSFET Switching Regulator IC for Buck Converter

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  • Description

    The NJW4170 is a high speed oscillating frequency buck converter with 40V/1A MOSFET. Current mode control and built-in phase compensation circuit minimize external parts and contribute to using a Low ESR Output Capacitor(MLCC) within wide input range from 4.5V to 40V. Therefore, the NJW4170 can realize downsizing of applications. Also, it has a soft start function, an external clock synchronization function, an over current protection and a thermal shutdown circuit. Over 2MHz of Switching frequency can avoid interference with the AM radio frequency. It is suitable for supplying power to a Car Accessory, Audio Automation Equipment, Industrial Instrument and so on.

  • Spec
    Input Voltage Range 4.5 V to 40 V (45 V)
    Operating Temperature Range -40°C to 125°C
    Supply Current Typ. 2000 µA
    Standby Current 1 (max.) µA
    Output Voltage Range 0.8 V to 31 V
    Output Voltage Accuracy ± 1 %
    Output Current 1000 mA
    Oscillator Frequency 2.4MHz typ. (A ver.)2.1MHz typ. (B ver.)
    Package SOT-89-5-2
    Control Current mode Control / PWM Control
    Function Standby Function
    Soft Start Function (4ms typ.)
    Over Current Protection (Hiccup type)
    Thermal Shutdown Protection
    Note Built-in Compensation Circuit
    UVLO (Under Voltage Lockout)
    External Clock Synchronization
    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
    • 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.

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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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