BD8641EFV-E2

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	BD8641
Supplier Device Package:	20-HTSSOP-B
Package / Case:	20-VSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	250kHz ~ 2.3MHz
Current - Output:	3A
Voltage - Output (Max):	5.5V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction

BD8641EFV-E2 is a DC/DC switching regulator from ROHM Semiconductor, designed for applications that require a high level of efficiency due to their wide input voltage range, low quiescent current, and the external short-circuit protection function. It is optimized for use in noise-sensitive application fields such as camera modules, communication modules, and consumer products.

Application Field

BD8641EFV-E2 is a compact DC/DC switching regulator suitable for a wide range of applications. It can be used in consumer applications such as laptop computers, DVD players, gaming consoles, and digital audio players, as well as automotive applications, such as in-vehicle infotainment systems and navigation systems. It is also suitable for embedded solutions and can be used for industrial field supplies, medical equipment, and a variety of other applications.

Features

The BD8641EFV-E2 features a wide input voltage range of up to 28 V, and a maximum output current of 3 A. It can be used with a variety of external components such as MOSFETs, inductors, and capacitors in order to provide a large number of output voltage combinations. Its built-in short-circuit protection prevents damage to external components. Another key feature is its low quiescent current (typ. 40μA) which makes it suitable for low power applications. The device also includes a variety of control functions, such as a PWM frequency control, output voltage adjustable accuracy, and a soft-start function which helps prevent in-rush current surges. It is also equipped with a thermal shutdown function for extra protection in cases of an overcurrent being applied.

Working Principle

The BD8641EFV-E2 operates in a normal mode or an eco-mode. When in normal mode, an onboard PWM driver is used to monitor the input voltage and control the switching frequency. This ensures a constant output voltage and maintains high levels of efficiency. When in eco-mode, the onboard PWM driver switches the operating frequency to a lower value in order to reduce the current consumption, making it suitable for applications that do not require a high output current. In addition, the BD8641EFV-E2 uses an external short-circuit protection function in order to prevent damage to external components. This protection system consists of a P-channel MOSFET, which is connected in series with the input voltage, and a comparator, which monitors the voltage drop across the MOSFET and then causes the built-in PWM driver to shut off when the voltage drop reaches a certain level.

Conclusion

The BD8641EFV-E2 is a high-efficiency DC/DC switching regulator from ROHM Semiconductor with features suitable for a wide range of applications. Its wide input voltage range, low quiescent current, and external short-circuit protection function make it an ideal choice for low power applications. In addition, its onboard PWM driver, frequency control, and soft-start function make it easy to use, and it is equipped with a thermal shutdown function for extra protection in cases of an overcurrent being applied.

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