LT3973EMSE#PBF

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The LT3973EMSE#PBF is a DC-DC synchronous step-down buck regulator. As part of the switching regulator family, the device enables conversion of higher voltage rails to lower voltage rails with high efficiency and fast transient response. It comes in an easy-to-use 5mm x 6mm QFN package, drawing only 2.5mΩ of MOSFET on-resistance—making it a power-efficient choice for system design.

The LT3973EMSE#PBF is optimized for use in power applications such as computer motherboards, point of load regulation, 3.3V or 5V output from 12V input, 4.5V or 5V output from 9V or 12V input, low drop-out linear regulators, and various battery-powered systems. With a wide input voltage range of 4.5V to 40V, it is an excellent choice for systems that require a stable output voltage over a wide range of input voltages.

The LT3973EMSE#PBF is equipped with several features to enhance performance. Its adjustable switching frequency of up to 300kHz helps reduce system component size and optimize efficiency. As a synchronous buck converter, it operates by synchronizing the switching regulate to the switching of the internal power MOSFETs. This increases efficiency since the power dissipation shifts to internal MOSFETs, eliminating the need for external power components such as Schottky diodes and reducing power loss due to conduction loss. An adjustable programmable current limit option protects the device against overload conditions. It also features adjustable soft-start and over-temperature protection, allowing the device to be used in a variety of applications. The LT3973EMSE#PBF also has an enable pin which can be used to enable or disable the device, providing an additional level of flexibility and control.

The LT3973EMSE#PBF is designed for low noise operation and comes with on-board EMI filtering. It supports multiple PWM dimming schemes, such as analog dimming, pulsed dimming, and digital PWM dimming. A wide range of output voltages can also be set for the device, with a maximum voltage of 40V.

In summary, the LT3973EMSE#PBF is a highly efficient and reliable DC-DC synchronous buck regulator. With its wide input voltage range, adjustable switching frequency, adjustable programmable current limit, adjustable soft-start and over-temperature protection, and on-board EMI filtering, it is an excellent choice for a variety of applications. It allows users to achieve precise voltage regulation with minimal heat dissipation and optimal efficiency, providing a cost-effective solution for system design.

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