LT3973HDD-5#PBF

The LT3973HDD-5#PBF belongs to the PMIC category of Voltage Regulators, and specifically to the DC DC Switching Regulator family. It has several features and applications, and a specific working principle as well. In this article, we shall discuss the application field and working principle of the LT3973HDD-5#PBF.

Application Field

The LT3973HDD-5#PBFis a synchronous step-down DC/DC controller with an integrated high side N-channel MOSFET and an adjustable high frequency current mode architecture. The device features a wide operating voltage range of 3V to 18V, making it suitable for use in lower input voltage systems. The internal compensation circuit together with the adjustable peak current control guarantee adjustable output voltage, fast dynamic response and tight regulation. The device supports 2.5A continuous output current and 4A maximum peak output current.

The LT3973HDD includes several integrated protection features, such as programmable soft-start/hiccup mode, undervoltage lockout (UVLO), cycle-by-cycle current limit, thermal shutdown, open-circuit LED protection, over temperature protection, and peak current limit. Moreover, it operates with an adjustable frequency of 300KHz to 2MHz and supports programmable loop compensation.

This DC/DC switching regulator is suitable for various applications such as portable electronic devices, mobile computing and communications, point-of-load converters, server and networking systems, automotive, and industrial applications.

Working Principle

The working principle of the LT3973HDD-5#PBF is a combination of synchronous step-down DC/DC controllers and a high side N-channel MOSFET. It is also known as a buck / boost controller, as it is capable of operating in either buck or boost mode depending on the voltage level of the input source.

In buck mode, the LT3973HDD-5#PBF steps down the level of the input voltage to the desired output voltage through an electrically-controlled MOSFET switch. The desired output voltage is achieved through proper adjustment of an internal compensation circuit. The device also features a programmable soft-start/hiccup mode and adjustable peak current control, which helps maintain tight regulation.

In boost mode, the device steps up the voltage level of the input source to the desired output voltage. Similarly, the desired output voltage is achieved by proper adjustment of the internal compensation circuit. The device also features integrated protection features such as undervoltage lockout (UVLO), cycle-by-cycle current limit, and thermal shutdown.

Conclusion

The LT3973HDD-5#PBF is a DC/DC switching regulator that belongs to the PMIC category of Voltage Regulators and specifically to the DC DC Switching Regulators family. It is suitable for various applications such as portable electronic devices, mobile computing and communications, point-of-load converters, server and networking systems, automotive, and industrial applications. It has a wide operating voltage range of 3V to 18V and supports 2.5A continuous output current and 4A maximum peak output current. The device utilizes a synchronous step-down architecture with an integrated high side N-channel MOSFET to operate in either buck or boost mode depending on the voltage level of the input source. It also features several integrated protection features such as programmable soft-start/hiccup mode, undervoltage lockout (UVLO), cycle-by-cycle current limit, thermal shutdown, open-circuit LED protection, over temperature protection, and peak current limit.