NR121E |Sanken Electric



Data Sheetdownload (PDF:753.92KB)
Application Notedownload (PDF:1035.43KB)


NR120E series is buck regulator ICs integrates High-side power MOSFETs.
The feature increasing efficiency at light loads allows the device to be used in the energy-saving applications.
With the current mode control, ultra low ESR capacitors such as ceramic capacitors can be used.
The ICs have protection functions such as Over-Current Protection (OCP), Under-Voltage Lockout (UVLO) and Thermal Shutdown (TSD).
An adjustable Soft-Start by an external capacitor prevents the excessive inrush current at turn-on.
The ON/OFF pin (EN Pin) turns the regulator on or off and helps to achieve low power consumption requirements.
The ICs integrate phase compensation circuit which reduces the number of external components and simplifies the design of customer application.
The NR120E series is available in an 8-pin SOIC package with an exposed thermal pad on the back side.


 Blu-Ray
 Stand-by power supply for digital appliances


・Maximum efficiency: 94%
・PWM mode
・Low ESR (i.e. ceramic condensers) can be used for output
・Built-in protection circuit
  Overcurrent protection (OCP): drooping type auto restart
  Thermal shutdown (TSD) : auto restart
  Undervoltage (UVLO) circuit
・Built-in phase compensation, with no need for external components
・Adjustable soft-Start with an external capacitor
・ON/OFF function



Package Name:eSOIC8

Package Diagram

Design Support


Built-in PowerYES
Output Voltage0.8V to 14V
Output Current3A
Input Voltage Range4.5V to 18V
Operating Frequency350kHz
Current Mode ControlYES
Maximum Input Voltage18V
Minimum Input Voltage4.5V
Output on/offYES
Low ESR Capacitor SupportYES
Overcurrent ProtectionDrooping Type
Phase CompensationBuilt-in
Thermal ProtectionYES

Representative Circuit

Internal Block Diagram

Pin-Out Diagrams

Data Sheetdownload (PDF:753.92KB)
Application Notedownload (PDF:1035.43KB)
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