2.4MHz, 2.5A MOSFET Switching Regulator IC for Buck Converter

Data Sheet


  • High Oscillating Frequency (100kHz to 2.4MHz)
  • High Efficiency at Light Loads A ver.
  • Low Iq at Sleep Mode (Iq=120µA typ. A ver.)
  • Current Mode Control
  • External Clock Synchronization
  • Wide Operating Voltage Range (3.4V to 40V)
  • Switching Current (3.6A min.)
  • PWM Control
  • Maximum Duty Cycle 100%
  • External Compensation Circuit
  • Correspond to Ceramic Capacitor (MLCC)
  • Soft Start Function (2ms typ.)
  • UVLO (Under Voltage Lockout)
  • Over Current Protection (Hiccup type)
  • Thermal Shutdown Protection
  • Power Good Function
  • Standby Function
  • Package Outline (HSOP8-M1)

General Description

The NJW4171 is a high speed oscillating frequency buck converter with 40V/2.5A MOSFET. It has two lineup: the A version has PWM/PFM mode to ensure high efficiency at light load, the B version is forced PWM mode. 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 NJW4171 has wide switching oscillating frequency range, 100kHz to 2.4MHz and internal external clock synchronization function. Therefore the NJW4171 can avoid interference with the AM radio frequency. Internal protection functions: UVLO, an over current protection and a thermal shutdown circuit can protect circuit when abnormal condition. The NJW4171 has wide coverage in consumer electronics and industrial application, because of features that are wide input range, wide switching oscillating frequency range and 100% maximum duty cycle.


  • Consumer Electronics
  • Industrial Equipment
  • High voltage to logic and microprocessor power supplies

Design Simulation Models

Package Information

Part NumberPackage OutlinePLPPinsMaterial Declaration (RoHS/Halogen)Terminal FinishWeight(mg) (Reference)Reflow solderingFlow solderingIron solderingPacking ConditionMSLSolder Foot Print
NJW4171GM1-AHSOP8-M1-8Pure Sn81Yes--Non dry pack1
NJW4171GM1-BHSOP8-M1-8Pure Sn81Yes--Non dry pack1

Sample & Buy

Part NumberPackagesStatusPacking SpecificationSampleBuy
NJW4171GM1-AHSOP8-M1(Active)Contact UsSales Support
NJW4171GM1-BHSOP8-M1(Active)Contact UsSales Support