SI9978DW-E3

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
Driven Configuration:	Half-Bridge
Channel Type:	Synchronous
Number of Drivers:	4
Gate Type:	N-Channel MOSFET
Voltage - Supply:	14.5 V ~ 17.5 V
Logic Voltage - VIL, VIH:	1V, 4V
Current - Peak Output (Source, Sink):	--
Input Type:	Non-Inverting
High Side Voltage - Max (Bootstrap):	40V
Rise / Fall Time (Typ):	110ns, 50ns
Operating Temperature:	-40°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	24-SOIC (0.295", 7.50mm Width)
Supplier Device Package:	24-SOIC
Base Part Number:	SI9978

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Introduction

SI9978DW-E3 is a Power Management Integrated Circuit (PMIC), which specifically belongs to the Gate Drivers family. In this article, we will delve deep into the features and applications, as well as its working principle, of the SI9978DW-E3.

Features and Applications

The SI9978DW-E3 has numerous impressive features that make it suitable for a variety of applications. It has a wide operating temperature range, with a maximum operating temperature of +125°C. This makes the SI9978DW-E3 extremely reliable. It can also operate in a wide input voltage range of 4.5V to 30V. Additionally, it is extremely efficient, with a maximum efficiency of 95%. This makes it ideal for applications that require energy efficiency.The SI9978DW-E3 is mainly used for driving high power MOSFETs and IGBTs. It has a peak output current of 6.7A, which makes it suitable for high power applications. It also has several protections such as over-temperature protection, short-circuit protection, and over-voltage protection, providing excellent safety for the device. In addition, it also has low noise operation, with an integrated noise filter. These features make it ideal for many applications, such as motor control, LED lighting control, and power conversion.

Working Principle

The SI9978DW-E3 is essentially a three-terminal P-channel MOSFET driver. The main difference between this device and other P-MOSFET drivers is its ability to use a high gate voltage to drive a low resistance. This is achieved by using a bootstrap circuit, which uses a high-voltage capacitor to provide a high potential to the gate of the MOSFET.When the logic signal is low, the N-channel MOSFET is used for charging the bootstrap capacitor. This allows the bootstrap capacitor to provide a high voltage to the gate of the P-channel MOSFET, allowing it to turn on. Once the MOSFET is on, the P-channel MOSFET will be activated, thereby allowing current to flow. When the logic signal is high, the N-channel MOSFET will turn off and the gate voltage will be discharged. This will turn off the P-channel MOSFET, stopping the current from flowing.

Conclusion

SI9978DW-E3 is an impressive PMIC, which belongs to the Gate Drivers family. It has an impressive set of features and is suitable for a variety of applications, such as motor control, LED lighting control, and power conversion. It is also highly efficient, with a maximum efficiency of 95%. It has a wide operating temperature range and a wide input voltage range, making it suitable for high-powered applications. Furthermore, it has several protections and a low-noise operation, making it a reliable and safe choice. Finally, it employs a unique bootstrap circuit to provide a high voltage to the gate of the MOSFET, allowing it to turn on and off quickly and efficiently.

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