BD9P255EFV-C (New)
Nano Pulse Control™, 3.5V to 40V Input, 2A Single 2.2MHz Buck DC/DC Converter For Automotive

BD9P2x5EFV-C Series are current mode synchronous buck DC/DC converter integrating POWER MOSFETs.

Product Detail

Part Number | BD9P255EFV-CE2
Status | Recommended
Package | HTSSOP-B20
Unit Quantity | 2500
Minimum Package Quantity | 2500
Packing Type | Taping
RoHS | Yes

Functional Safety:

Category : FS supportive
A product that has been developed for automotive use and is capable of supporting safety analysis with regard to the functional safety.




Common Standard

AEC-Q100 (Automotive Grade)



Integrated FET / Controller

Integrated FET



Synchronous / Nonsynchronous












SW frequency(Max.)[MHz]


Light Load mode






Operating Temperature (Min.)[°C]


Operating Temperature (Max.)[°C]



  • Nano Pulse Control™
  • AEC-Q100 Qualified (Grade 1)
  • Minimum ON Pulse 50 ns (Max)
  • Synchronous Buck DC/DC Converter Integrating POWER MOSFETs
  • Soft Start Function
  • Current Mode Control
  • Reset Function
  • Quiescent Current 10 µA (Typ) with 12 V Input to 5.0 V Output
  • Light Load Mode (LLM)
  • Forced Pulse Wide Modulation (PWM) Mode
  • Phase Compensation Included
  • Selectable Spread Spectrum Switching
  • External Synchronization Function
  • Selectable Over Current Protection (OCP)
  • Input Under Voltage Lockout (UVLO) Protection
  • Thermal Shut Down (TSD) Protection
  • Output Over Voltage Protection


    • Evaluation Board
    • BD9P2x5EFV-TSB-001
    • This Evaluation Board was developed for ROHM’s single 2.2MHz buck DC/DC converter BD9P2x5EFV-C. BD9P2x5EFV-C Series are current mode synchronous buck DC/DC converter integrating POWER MOSFETs. The BD9P2x5EFV-C series accepts a power supply input range of 3.5V to 40V and generates a maximum output current of 2A.

  • User's Guide Purchase Inquiry

Design Resources



White Paper

  • Cutting-Edge Web Simulation Tool “ROHM Solution Simulator” Capable of Complete Circuit Verification of Power Devices and Driver ICs
  • For Automotive ADAS/Infotainment application, CISPR25 Class5 compliant 8 rails power tree Reference Design with power rail monitoring for supporting functional safety

User's Guide

  • Evaluation Board User's Guide for BD9P2x5EFV-C series

Technical Articles

Schematic Design & Verification

  • Calculation of Power Dissipation in Switching Circuit
  • Considering Input Filter to Reduce Conducted Emissions by DCDC Converter
  • Considering Polarity of Power Inductor to Reduce Radiated Emission of DC-DC converter
  • Method for Monitoring Switching Waveform
  • PCB Layout Techniques of Buck Converter
  • Phase Compensation Design for Current Mode Buck Converter
  • Bootstrap Circuit in the Buck Converter
  • Method for Determining Constants of
  • Power Supply Sequence Circuit with General Purpose Power Supply IC
  • Suppression Method of Switching Noise Using Linear Regulator and Low Pass Filter
  • Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)
  • Usage of SPICE Macromodel for DC/DC
  • Snubber Circuit for Buck Converter IC
  • Efficiency of Buck Converter
  • Calculation of Power Loss (Synchronous)
  • Inductor Calculation for Buck converter IC
  • Considerations for Power Inductors Used for Buck Converters
  • Capacitor Calculation for Buck converter IC
  • The Important Points of Multi-layer Ceramic Capacitor Used in Buck Converter circuit
  • Resistor Value Table to set Output Voltage of Buck Converter IC
  • Importance of Probe Calibration When Measuring Power: Deskew
  • Impedance Characteristics of Bypass Capacitor

Thermal Design

  • What Is Thermal Design
  • Method for Calculating Junction Temperature from Transient Thermal Resistance Data
  • Notes for Temperature Measurement Using Thermocouples
  • Two-Resistor Model for Thermal Simulation
  • Notes for Temperature Measurement Using Forward Voltage of PN Junction
  • Thermal Resistance
  • Precautions When Measuring the Rear of the Package with a Thermocouple


Simulations (Login Required)

ROHM Solution Simulator is a new web-based electronic circuit simulation tool that can carry out a variety of simulations, from initial development that involves component selection and individual device verification to the system-level verification stage. This makes it possible to quickly and easily implement complete circuit verification of ROHM power devices and ICs, in simulation circuits under close to actual conditions, significantly reducing application development efforts.
  • BD9P255EFV-C / Frequency Response
  • BD9P255EFV-C / Line Response
  • BD9P255EFV-C / Load Response
  • Simulation Guide for BD9P255EFV-C / Frequency Response (ROHM Solution Simulator)
  • Simulation Guide for BD9P255EFV-C / Line Response (ROHM Solution Simulator)
  • Simulation Guide for BD9P255EFV-C / Load Response (ROHM Solution Simulator)

Calculation Tools

This Calculation Sheet supports the application circuit design of switching regulators. The sheet has formulas necessary for determining peripheral parts. You can easily determine the circuit parameters that meet the desired characteristics by setting the values according to the guidance.
  • Calculation-sheet for the circuit theoretical formula - BD9Pxx5EFV/MUF-C


  • BD9P2x5EFV-C Series Two-Resistor Thermal Model Report


  • BD9P255EFV-C Footprint / Symbol
  • HTSSOP-B20 Footprint / Symbol
  • HTSSOP-B20 3D STEP Data

Packaging & Quality

Manufacturing Data

  • Factory Information