NJW1933 Series
600mA,500kHz,Step-Down Switching Regulator in SOT23

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  • Description

    The NJW1933 is a switching regulator IC for buck converter that operates wide input voltage range from 4.5V to 40V. The wide input range makes the NJW1933 suitable for several applications such as 12V and/or 24V industrial supplies, automotive batteries and the other unregulated voltage sources.It corresponds to Low ESR output capacitor (MLCC), high operating frequency of 500kHz, internally compensated and small SOT-23 package. Therefore, the NJW1933 can realize downsizing of applications with a few and tiny external parts so that adopts current mode control.
    Also, it has a soft start function, over current protection and thermal shutdown circuit.


    • Industrial Control Supplies
    • Automotive Battery Regulation
    • Office Automation Equipments

  • Spec
    Input Voltage Range 4.5 V to 40 V (45 V)
    Operating Temperature Range -40°C to 105°C
    Supply Current Typ. 1600 µA
    Standby Current 1 (max.) µA
    Output Voltage Range 1.245 V to 35.2 V
    Output Voltage Accuracy ± 1.6 %
    Output Current 600 mA
    Oscillator Frequency 500kHz Fixed (A-version)
    Package SOT-23-6-1
    Function Soft Start Function
    Over Current Protection
    Note Internally Compensated
    Under Voltage Lockout (UVLO)
    Uses Tiny Capacitors and Inductors
    Output Adjustable Down to 1.25V

    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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  • 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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