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Power Management

Current Mode Control High Speed Frequency Internal 1A MOSFET Switching Regulator IC for Buck Converter

  • Oscillating Frequency (
    2.4MHz typ. (A ver.)
    2.1MHz typ. (B ver.))
  • Minimum ON time (
    80ns typ.(A ver.)
    85ns typ.(B ver.))
  • Current mode Control
  • External Clock Synchronization
  • Wide Operating Voltage Range (4.5V to 40V)
  • Switching Current (1.4A min.)
  • PWM Control
  • Built-in Compensation Circuit
  • Correspond to Ceramic Capacitor (MLCC)
  • Soft Start Function (4ms typ.)
  • UVLO (Under Voltage Lockout)
  • Over Current Protection (Hiccup type)
  • Thermal Shutdown Protection
  • Standby Function
  • Package Outline (
    NJW4170U2 : SOT-89-5
    NJW4170KV1 : DFN8-V1(ESON8-V1))
General Description
The NJW4170 is a high speed oscillating frequency buck converter with 40V/1A MOSFET. Current mode control and built-in phase compensation circuit minimize external parts and contribute to using a Low ESR Output Capacitor(MLCC) within wide input range from 4.5V to 40V. Therefore, the NJW4170 can realize downsizing of applications. Also, it has a soft start function, an external clock synchronization function, an over current protection and a thermal shutdown circuit. Over 2MHz of Switching frequency can avoid interference with the AM radio frequency. It is suitable for supplying power to a Car Accessory, Audio Automation Equipment, Industrial Instrument and so on.
Design Simulation Models
pdf NJW4170 Application Simulator
Package Information
Part Number Package OutlinePinsMaterial Declaration (RoHS/Halogen)Terminal FinishWeight(mg) (Reference)Reflow solderingFlow solderingIron solderingPacking ConditionMSLSolder Foot Print
5Sn2Bi61YesYesYesNon dry pack1
5Sn2Bi61YesYesYesNon dry pack1
8Sn2Bi7.2Yes--Non dry pack1
Sample & Buy
Part NumberPackagesStatusPacking SpecificationSample  Buy   

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