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

Data Sheet


  • Pin compatible with LT1933 and LT2842. Also it is possible to reduce an external part
  • Maximum Rating Input Voltage (45V)
  • Wide Operating Voltage Range (4.5V to 40V)
  • Switching Current (0.8A min.)
  • Fixed Operating Frequency (500kHz (A-version))
  • Uses Tiny Capacitors and Inductors
  • Soft Start Function
  • Low Shutdown Current < 1µA
  • Internally Compensated
  • Under Voltage Lockout (UVLO)
  • Output Adjustable Down to 1.25V
  • Over Current Protection
  • Thermal Shutdown Protection
  • Package Outline (SOT-23-6-1)

General 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

Design Simulation Models

Package Information

Part NumberPackage OutlinePLPPinsMaterial Declaration (RoHS/Halogen)Terminal FinishWeight(mg) (Reference)Reflow solderingFlow solderingIron solderingPacking ConditionMSLSolder Foot Print
NJW1933F1SOT-23-6-16Sn2Bi15YesYesYesNon dry pack1

Sample & Buy

Part NumberPackagesStatusPacking SpecificationSampleBuy
NJW1933F1SOT-23-6-1(Active)Contact UsStock Check