FAN7842M

Current - Peak Output (Source, Sink):	350mA, 650mA
Base Part Number:	FAN7842
Supplier Device Package:	8-SOP
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C (TJ)
Rise / Fall Time (Typ):	60ns, 30ns
High Side Voltage - Max (Bootstrap):	200V
Input Type:	Non-Inverting
Series:	--
Logic Voltage - VIL, VIH:	0.8V, 2.9V
Voltage - Supply:	10 V ~ 20 V
Gate Type:	IGBT, N-Channel MOSFET
Number of Drivers:	2
Channel Type:	Independent
Driven Configuration:	Half-Bridge
Part Status:	Obsolete
Packaging:	Tube

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Introduction

FAN7842M is a highly integrated high-side and low-side gate driver developed by Fairchild Semiconductor. It integrates high-side PMOS, low-side NMOS, and N-channel MOSFETs to provide a controllable and efficient method of driving MOSFETs in most designs. Due to its high efficiency, low operating current and low output impedance, FAN7842M can be effectively used in a wide range of power management, motor control and automation applications. This article will discuss the application field and working principle of FAN7842M as well as its advantages over other similar solutions.

Application Field

FAN7842M is primarily used for driving MOSFETs in power management, motor control and automation systems. It features a low-side NMOS transistor with 0.3 V on-voltage drop to allow for efficient and reliable MOSFET driving, and also a high-side PMOS transistor. This combination of devices enables the FAN7842M to drive MOSFETs at high efficiency while keeping operating current and output impedance low. In power management applications, the FAN7842M can be used to drive an external MOSFET to manage power delivery to a system. This can be done by controlling the on/off switching of the external FET in order to regulate the power supply\'s voltage rail. The FAN7842M can be used to quickly switch between high-side and low-side MOSFETs depending on the load or system requirements. FAN7842M can also be used for motor control. Its integrated high-side and low-side MOSFETs can be efficiently used to drive different types of motors, such as DC and brushless DC motors. The FAN7842M also has a low-side NMOS transistor with 0.3 V on-voltage drop to achieve high efficiency in motor control applications. Lastly, FAN7842M can be used for automation systems. The low-level input voltage and low operating current of the FAN7842M make it ideal for use in automation systems where precise control of MOSFETs is necessary. Additionally, the wide input voltage range allows for use in a variety of automation systems.

Working Principle

FAN7842M operates by using its integrated high-side PMOS and low-side NMOS MOSFETs to drive an external MOSFET. The high-side PMOS transistor is responsible for driving the voltage rail to a low or high level depending on the input signal. The low-side NMOS transistor is responsible for controlling the voltage output of the external MOSFET. This combination of devices provides a precise and efficient solution for driving MOSFETs. The FAN7842M also has an internal bias generator which provides a precise and stable bias voltage to the integrated high-side and low-side MOSFETs. This bias voltage is necessary for effortless switching of the two MOSFETs and to keep the MOSFET output impedance low. Additionally, the internal bias generator ensures that the MOSFETs are switched at the correct turn-on and turn-off times.

Advantages

FAN7842M has some key advantages over other solutions. Firstly, it has a wide input voltage range, making it suitable for use in a variety of applications. Secondly, it has a low-side NMOS transistor with 0.3 V on-voltage drop which allows for high efficiency operation. Thirdly, the integrated high-side and low-side MOSFETs provide precise and controlled switching of the external MOSFET. And lastly, the internal bias generator keeps the MOSFET output impedance low and also ensures that the MOSFETs are switched at the correct times.In conclusion, FAN7842M is a highly integrated, high-efficiency gate driver designed for use in power management, motor control and automation systems. It offers many advantages over other solutions such as its wide input voltage range, low operating current, low-side NMOS transistor with 0.3 V on-voltage drop and internal bias generator. These features make FAN7842M an attractive solution for driving MOSFETs in these applications.

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