Specification	BD9C301FJ-E2

Current - Output	3 A
Frequency - Switching	500 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	85 C
Operating Temperature [Min]	-40 ¯C
Output Configuration	Positive
Output Type	Adjustable
Package / Case	0.154 in
Package / Case	8-SOIC
Package / Case	3.9 mm
Supplier Device Package	8-SOP-J
Synchronous Rectifier	True
Topology	Buck
Voltage - Input (Max) [Max]	18 V
Voltage - Input (Min) [Min]	4.5 V
Voltage - Output (Max) [Max]	12.6 V
Voltage - Output (Min/Fixed)	0.8 V

BD9C301 Series

4.5V to 18V Input, 3.0A Integrated MOSFET 1ch Synchronous Buck DC/DC Converter

Part	Function	Output Configuration	Frequency - Switching	Current - Output	Voltage - Input (Max) [Max]	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package	Output Type	Number of Outputs	Voltage - Input (Min) [Min]	Mounting Type	Voltage - Output (Max) [Max]	Package / Case	Package / Case	Package / Case	Topology	Voltage - Output (Min/Fixed)	Outputs and Type	Outputs and Type	Board Type	Supplied Contents	Regulator Topology	Main Purpose	Contents	Voltage - Input [Min]	Voltage - Input [Max]	Utilized IC / Part	Voltage - Output
Rohm Semiconductor BD9C301FJ-LBGH2	Step-Down	Positive	500 kHz	3 A	18 V	85 C	-40 ¯C	8-SOP-J	Adjustable	1	4.5 V	Surface Mount	12.6 V	0.154 in	8-SOIC	3.9 mm	Buck	0.8 V
Rohm Semiconductor BD9C301FJ-E2	Step-Down	Positive	500 kHz	3 A	18 V	85 C	-40 ¯C	8-SOP-J	Adjustable	1	4.5 V	Surface Mount	12.6 V	0.154 in	8-SOIC	3.9 mm	Buck	0.8 V
Rohm Semiconductor BD9C301FJ-EVK-001			500 kHz	3 A															1	1 Non-Isolated Output Non-Isolated	Fully Populated	Board(s)	Buck	DC/DC Step Down	Board(s)	4.72 V	18 V	BD9C301	3.3 V

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 1.43
		10	$ 1.04
		25	$ 0.95
		100	$ 0.84
		250	$ 0.79
		500	$ 0.76
		1000	$ 0.73
	Digi-Reel®	1	$ 1.43
		10	$ 1.04
		25	$ 0.95
		100	$ 0.84
		250	$ 0.79
		500	$ 0.76
		1000	$ 0.73
	N/A	14533	$ 1.43
	Tape & Reel (TR)	2500	$ 0.71
		5000	$ 0.69
		7500	$ 0.68
		12500	$ 0.67

Description

General part information

BD9C301 Series

This is the product guarantees long time support in Industrial market. BD9C301FJ is a synchronous buck switching regulator with built-in low on-resistance power MOSFETs. With wide input voltage range, It is capable of providing current of up to 3 A. It is a current mode control DC/DC converter and features high-speed transient response. Phase compensation can also be set easily.

Documents

Technical documentation and resources

Judgment Criteria of Thermal Evaluation

Thermal Design

Evaluation Board User's Guide

BD9C301FJ-E2

Deep-Dive with AI

BD9C301FJ-E2

Deep-Dive with AI

Technical Specifications

BD9C301 Series

Pricing

Description

BD9C301 Series

Documents

Judgment Criteria of Thermal Evaluation

Evaluation Board User's Guide

Compliance with the ELV directive

Snubber Circuit for Buck Converter IC

SOP-J8 Package Information

Method for Calculating Junction Temperature from Transient Thermal Resistance Data

Cutting-Edge Web Simulation Tool "ROHM Solution Simulator" Capable of Complete Circuit Verification of Power Devices and Driver ICs

Measurement Method for Phase Margin with Frequency Response Analyzer (FRA)

BD9C301FJ Reference Circuits and Bomlist

Inductor Calculation for Buck converter IC

Precautions When Measuring the Rear of the Package with a Thermocouple

Heat Dissipation Effect of Thermal Via in Exposed Pad Type Package

The Important Points of Multi-layer Ceramic Capacitor Used in Buck Converter circuit

Step-down DC-DC converter PCB layout EMC Design guide

Method for Determining Constants of Peripheral Parts of Buck DC/DC Converter

Efficiency of Buck Converter

Anti-Whisker formation

How to Use the Thermal Resistance and Thermal Characteristics Parameters

θ<sub>JC</sub> and Ψ<sub>JT</sub>

Basics of Thermal Resistance and Heat Dissipation

BD9C301FJ Data Sheet

Overview of ROHM's Simulation Models(for ICs and Discrete Semiconductors)

Calculation of Power Loss (Synchronous)

Types of Capacitors Used for Output Smoothing of Switching Regulators and their Precautions

PCB Layout Essential Check sheet for Switching Regulator

Design Guide and Example of Stencil for Exposed Pad

Five Steps for Successful Thermal Design of IC

θ<sub>JA</sub> and Ψ<sub>JT</sub>

How to Use the Two-Resistor Model

Factory Information

Diode Selection Method for Asynchronous Converter

PCB Layout for BD9C301FJ

UL94 Flame Classifications of Mold Compound

What Is Thermal Design

Capacitor Calculation for Buck converter IC

Three Steps for Successful Design of DC-DC Converters

Solder Joint Rate and Thermal Resistance of Exposed Pad

Considerations for Power Inductors Used for Buck Converters

Impedance Characteristics of Bypass Capacitor

PCB Layout Thermal Design Guide

Phase Compensation Design for Current Mode Buck Converter

Bootstrap Circuit in the Buck Converter

Precautions for PCB Layout Regarding Common Mode Filters

Suppression Method of Switching Noise Using Linear Regulator and Low Pass Filter

Buck DC/DC Converter Recommended Inductor List

Considering Polarity of Power Inductor to Reduce Radiated Emission of DC-DC converter

PCB Layout Techniques of Buck Converter

Two-Resistor Model for Thermal Simulation

Calculation of Power Dissipation in Switching Circuit

Power Supply Sequence Circuit with General Purpose Power Supply IC

Resistor Value Table to set Output Voltage of Buck Converter IC

Considering Input Filter to Reduce Conducted Emissions by DCDC Converter

Thermal Resistance

BD9C301 Series