NJW4155 Series
Current Mode Control Internal 1.8A MOSFET Switching Regulator IC for Buck Converter

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  • Description

    The NJW4155 is a buck converter with 40V/1.8A MOSFET. It corresponds to high oscillating frequency, and Low ESR Output Capacitor (MLCC) within wide input range from 4.5V to 40V. Therefore, the NJW4155 can realize downsizing of applications with a few external parts so that adopts current mode control. Also, it has a soft start function, external clock synchronization, over current protection and thermal shutdown circuit. It is suitable for supplying power to a Car Accessory, Office 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. 3500 µA
    Standby Current 3 (max.) µA
    Output Voltage Range 0.8 V to 36.8 V
    Output Voltage Accuracy ± 1 %
    Output Current 1800 mA
    Oscillator Frequency 450kHz typ.(A, D ver.)
    300kHz typ.(B ver.)
    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 (NJW4155GM1 only)
    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
  • Quality &
    • Refer to the datasheets for the details on the product.
    • The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and recommended land pattern.
    • Please contact us or our distributors for unpublished reliability information.

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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