Part Number: BD9G341AEFJ-E2

Manufacturer: Rohm Semiconductor

Description: IC REG BUCK ADJ 3A 8HTSOP-J

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of BD9G341AEFJ-E2

Datasheet  BD9G341AEFJ-E2 datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – DC DC Switching Regulators
Manufacturer Rohm Semiconductor
Packaging Tape & Reel (TR)
Part Status Active
Function Step-Down
Output Configuration Positive
Topology Buck
Output Type Adjustable
Number of Outputs 1
Voltage – Input (Min) 12V
Voltage – Input (Max) 76V
Voltage – Output (Min/Fixed) 1V
Voltage – Output (Max) 76V
Current – Output 3A
Frequency – Switching 50kHz ~ 750kHz
Synchronous Rectifier No
Operating Temperature -40°C ~ 85°C (TA)
Mounting Type Surface Mount
Package / Case 8-SOIC (0.154″, 3.90mm Width) Exposed Pad
Supplier Device Package 8-HTSOP-J

BD9G341AEFJ-E2 Introduction

Welcome to a new era of power supply design. The BD9G341AEFJ is an advanced buck switching regulator that has a lot of cool functions and uses cutting-edge technology. This regulator is designed to change the way you control power. It has a highly efficient 150-m power MOSFET, current mode architecture, and an operation frequency range that can be set from 50 kHz to 750 kHz. With an input voltage range of 12V to 76V and features that can be changed, the BD9G341AEFJ has the best performance and flexibility on the market. Let’s look at the amazing things it can do.

General Description

The BD9G341AEFJ is an advanced buck switching regulator with a 150-m power MOSFET that is very efficient and a number of other great features. Its current mode design makes sure that it responds quickly to changes and makes it easy to set up phase compensation. Also, the operating frequency of this regulator can be set by the user and can be anywhere from 50 kHz to 750 kHz. The BD9G341AEFJ has several safety features, such as overcurrent protection, thermal shutdown, and undervoltage lockout, to make sure it works well. Also, users can change the under-voltage lockout and hysteresis values to suit their needs.

BD9G341AEFJ-E2 Features

  • Large range of input voltages, from 12V to 76V.
  • Integrated NchFET with 80V/3.5A/150m
  • Current mode.
  • The frequency ranges from 50 kHz to 750 kHz.
  • Accurate standard voltage. (1.0 vs. 1.5%).
  • The ENUVLO level is accurate (3%).
  • function of a soft start

PCB Layout

Layout is a key part of making sure that a power source’s design works as well as it can. There are different signal paths in the system that carry currents or voltages that change quickly. When these signals combine with stray inductance or parasitic capacitance, noise can be made or the power supply’s performance can get worse.

To avoid these problems, you must connect the VCC pin to ground using a ceramic bypass capacitor with a B dielectric that has a low equivalent series resistance (ESR). Care should be taken to keep the loop area between the bypass capacitor, the VCC pin, and the anode of the catch diode as small as possible.

The GND pin should be connected directly to both the thermal pad under the integrated circuit (IC) and the thermal pad in general. This straight connection makes it easier for impedance and parasitic inductance to have less of an effect. Also, the high-current line should be thick and short to reduce the effects of resistance and inductance even more.

To reduce the amount of parasitic capacitance and resistance caused by the layout pattern, the input decoupling capacitor should be placed as close as possible to the VCC pins. In the same way, the catch diode and the inductance parts should be close to the Lx pin.

For effective heat dissipation, the thermal pad should be linked to internal PCB ground planes using multiple vias directly under the IC. It is important to remember that the GND feedback resistor, the phase adjustment element, and the RT resistor should not share an impedance resistor with the high current line.

Overall, the performance of a power supply design can be made much better by paying attention to layout issues like bypassing, minimizing loop area, lowering impedance and inductance, and optimizing heat escape.

Operational Notes

● Power supply lines

Carefully planning the PCB layout pattern is vital to guaranteeing low-impedance supply lines. This requires taking into account how to separate the supply and ground connections for the digital and analog blocks. Separating these lines aids in preventing noise from the digital block’s ground and supply lines from adversely influencing the analog block.

Connecting capacitors to earth at all power supply pins is essential, in addition to correct isolation. These capacitors act as bypass capacitors and aid in high-frequency noise filtering, supplying the components with steady and clean power. For this function, ceramic capacitors are advised because they have a low equivalent series resistance (ESR) and effectively reduce noise.

It is crucial to consider how temperature and aging affect an electrolytic capacitor’s capacitance value while using one. With time and temperature changes, electrolytic capacitors frequently show changes in capacitance. To ensure constant and dependable performance, it is essential to take these parameters into account throughout the design phase and use capacitors with the proper temperature and age properties.

It is feasible to reduce noise, maintain low impedance supply lines, and guarantee reliable power distribution throughout the system by taking these factors into account while designing the PCB layout, such as separating ground and supply lines and including the proper capacitors.

● Ground Wiring Pattern

To prevent fluctuations in the small-signal ground produced by large currents, when employing both small-signal and high-current ground traces, the two ground traces should be routed separately but coupled to a single ground at the reference point of the application board. Additionally, make sure that no fluctuations in the ground voltage are caused by the ground traces of external components. To lower line impedance, the ground lines must be as short and thick as possible. ‘

● Inrush Current

Due to inherent delays and powering sequences, it is likely that the internal logic of the IC will be unstable when power is first applied. This is especially true if the IC uses several power supplies. Therefore, pay close attention to the power coupling capacitance, power wiring, ground wiring width, and connection routing.

● Testing on Application Boards

Connecting a capacitor directly to a low-impedance output pin may stress the IC when testing it on an application board. After each procedure or step, discharge the capacitors completely. During the inspection procedure, the IC’s power supply must always be completely turned off before being connected to or removed from the test setup. Ground the IC during assembly and take equivalent safety measures during travel and storage to avoid static discharge damage.

● Unused input pins

A MOS transistor’s gate is frequently connected to an IC’s input pins. Extremely low capacitance and high impedance characterize the gate. It can readily be charged by the external electric field if left disconnected. This method of acquiring a little charge is sufficient to have a considerable impact on the conduction of the transistor and result in unanticipated IC functioning. Unused input ports should therefore be linked to the power supply or ground line, unless otherwise indicated.


To sum up, the BD9G341AEFJ is a game-changer in the field of power supply design. This cutting-edge buck switching regulator offers countless possibilities for your projects thanks to its high efficiency, adaptable input voltage range, and adjustable features. The BD9G341AEFJ is your dependable companion in delivering stable and effective power, whether you’re building for industrial applications, automotive systems, or other power-sensitive areas. With the BD9G341AEFJ, you can experience the future of power management and realize the full potential of your designs.

At ICRFQ, we are committed to providing the highest quality support and assistance to our clients. To learn how the BD9G341AEFJ can improve your technological ideas, get in touch with us right away. Start innovating with confidence and make the most of this trustworthy connectivity.

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