NJW4177 Series
Internal 2A MOSFET Switching Regulator IC for Synchronous Buck Converter

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  • Description

    The NJW4177 is a synchronous buck converter with 40V/2A MOSFET. It can support the application of the high efficiency by synchronous rectification. The NJW4177 can select PFM mode to ensure high efficiency in the light load. 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 built-in phase compensation circuit and internally fixed soft start function minimize external parts. Also, current mode control contributes to using a small low ESR Output Capacitor(MLCC).Therefore, the NJW4177 can realize downsizing of applications. It is suitable for power supply circuit of microprocessor, DSP and so on that need fast transient response.


    • Power supply for Automotive
    • Infotainment
    • Industrial Equipment

  • Spec
    Input Voltage Range 3.6 V to 40 V (45 V)
    Operating Temperature Range -40°C to 125°C
    Supply Current Typ. 2800 µA
    Standby Current 5 (max.) µA
    Output Voltage Range 0.8 V to 38 V
    Output Voltage Accuracy ± 1 %
    Output Current 2000 mA
    Oscillator Frequency 450kHz typ. (A ver.)
    300kHz typ. (B ver.)
    Maximum Duty Cycle 100%
    Package HSOP8-M1
    Control Current Mode Control / PWM Control
    Function Standby Function
    Soft Start Function 4ms typ.
    Over Current Protection (Hiccup type)
    Thermal Shutdown Protection
    Power Good Function
    Note 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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Category:DC/DC Switching Regulators

Topology Buck
min (V)
max (V)
min (V)
max (V)