NJW1871A Series
MOSFET Drive Switching Regulator IC for Boost / Fly-Back Converter

Download Datasheet

  • Description

    The NJW1871A is a MOSFET drive switching regulator IC for boost / fly-back converters that operates wide operating voltage range from 4.5V to 40V. The internal Nch MOSFET driver circuit provides high efficiency driving, makes this device ideal for high output current applications. The protection function is equipped with pulse-by-pulse overcurrent detection to limit the switching current at overload. Automatic recovery of switching is possible upon recovery of load abnormalities. In addition, the high transmit frequency support allows AM band noise avoidance and small inductors to be used. The NJW1871A is suitable for boost / fly-back applications such as automotive and industrial instruments and so on.


    • Consumer Electronics
    • Industrial Instruments
    • Boost converter for small to middle range power supplies

  • Spec
    Consumer Automotive
    Input Voltage Range 4.5 V to 40 V (45 V)
    Operating Temperature Range -40°C to 125°C
    Supply Current Typ. 1200 µA Max. 1700 µA
    Standby Current 10 µA Max. 20 µA
    Output Voltage Accuracy ± 1 % ± 2 %
    Oscillator Frequency 1000kHz to 2000kHz
    Package MSOP10(VSP10)
    Control Current Mode Control / PWM Control
    Function Standby Function
    Soft Start (Fixed 20ms typ.)
    Over Current Protection (Hiccup)
    Over Voltage Protection
    Thermal Shutdown
    Note UVLO (Undervoltage Lockout)
    External Clock Synchronization
    Adjustable Startup Voltage
    AEC-Q100 AEC-Q100 Grade 1

    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

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        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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Category:DC/DC Switching Regulators

Topology Boost,Fly-Back
min (V)
max (V)
min (V)