L4976D

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The L4976D is a member of STMicroelectronics\' range of Quad Low-Side Power Switches with Overcurrent Protection. It is a DC-DC switching regulator, designed to be used in multiple applications with an output voltage of up to 40 volts and a maximum output current of 10 amps. It is designed to provide high efficiency and wide operating temperature range, making it ideal for a range of industrial applications. 

The L4976D provides four high and low side MOSFETs with integrated overcurrent protection, guaranteeing safe operation and system protection. Its low-side switches are tailored to be used in applications such as automotive and industrial, and its high-side switches are tailored to be used in IT equipment and consumer electronics. The integrated overcurrent protection allows the L4976D to be used to drive inductive loads, and its current monitoring can be used to switch off the whole system when a specified current is achieved.

The L4976D provides a wide input voltage range, allowing it to be used in systems with a supply voltage ranging from 6V to 60V. It also features a high-efficiency level of up to 92% with light load and a wide operating temperature range from -40°C to 85°C. Additionally, it incorporates both a current limit function and an over-temperature protection that prevents damage of the power IC when operated in extreme environmental conditions.

The working principle of the L4976D involves the use of an oscillator with external resistors and capacitors for frequency and amplitude control. The operating frequency can be adjusted between 100kHz and 4MHz, according to the application. The modulation of the oscillator is PWM, which is used to generate an asymmetric and complementary output signal that drives the MOSFETs. This signals are then connected to dedicated control pins to determine whether the high or low side of the MOSFETs is turned on.

The L4976D is ideal for applications in automotive and industrial markets, as it provides a high-efficiency level and a wide operating temperature range. Additionally, its current-monitoring and overcurrent protection guarantee system safety and its low-side switches are tailored to be used in automotive and industrial applications, while its high-side switches are tailored to be used in IT equipment and consumer electronics. All of these features make the L4976D a very attractive option for many applications.

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