Internal 2A MOSFET Switching Regulator IC for Synchronous Buck Converter

Data Sheet


  • Synchronous Rectification
  • Current Mode Control
  • External Clock Synchronization
  • Wide Operating Voltage Range (3.6V to 40V)
  • Switching Current (2.8A min.)
  • PWM Control
  • Maximum Duty Cycle 100%
  • PFM operation for Light Loads (MODE pin Selectable)
  • Built-in Compensation Circuit
  • Correspond to Ceramic Capacitor (MLCC)
  • Oscillating Frequency (
    450kHz typ. (A ver.)
    300kHz typ. (B ver.))
  • Soft Start Function 4ms 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 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

Package Information

Part NumberPackage OutlinePinsMaterial Declaration (RoHS/Halogen)Terminal FinishWeight(mg) (Reference)Reflow solderingFlow solderingIron solderingPacking ConditionMSLSolder Foot Print
NJW4177GM1-AHSOP8-M18Pure Sn81Yes--Non dry pack1
NJW4177GM1-BHSOP8-M18Pure Sn81Yes--Non dry pack1

Sample & Buy

Part NumberPackagesStatusPacking SpecificationSampleBuy
NJW4177GM1-AHSOP8-M1(Active)Contact UsSales Support
NJW4177GM1-BHSOP8-M1(Active)Contact UsSales Support