LTC3405AES6-1.8#TRMPBF

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The LTC3405AES6-1.8#TRMPBF is a synchronous step-down switching regulator fabricated by Linear Technology. This device has a wide input voltage range of 4.5 V to 42 V and can produce an output voltage of 0.6 V to V input. It features a current-mode architecture, internal power MOSFETs, and integrated compensation, making it ideal for automotive low-power voltage regulation applications.

The LTC3405AES6-1.8#TRMPBF belongs to the PMIC (Power Management ICs) family of voltage regulators. It is classified under DC-DC switching regulators, which are designed to efficiently convert a given input voltage to a lower, or regulated, output voltage. Such regulators are characterized by their high switching frequency allowing for high power density and are commonly used to condition power for embedded system, automotive, portable and instrumentation applications.

The LTC3405AES6-1.8#TRMPBF provides current-mode control and is ideal for controlling power distribution for multiple supply rails. It operates at a switching frequency of 1.8 MHz, allowing for up to 90% efficiency over a wide load range. It further features an adjustable soft-start feature, output overvoltage/overcurrent protection and includes a lossless current sensing technique employing an external sense resistor to sense load current.

The internal power stages consist of low-side and high-side power MOSFETs capable of providing a maximum load current of up to 1.5 A. This device offers a switch-node voltage-foldback protection feature, which ensures continuous operation during overload conditions by reducing the switch-node voltage. This protection feature also works during short-circuit conditions by preventing excessive inrush current.

The LTC3405AES6-1.8#TRMPBF also features an adjustable cycle-by-cycle current limit, which monitors the load current with higher accuracy than conventional methods. This allows for excellent light-load efficiency with minimal risk of power supply overloading. The output voltage can be set using an external resistive voltage divider, allowing for a wide range of output voltages.

In summary, the LTC3405AES6-1.8#TRMPBF is a synchronous step-down switching regulator ideal for automotive low-power voltage regulation applications. It features a current-mode architecture, internal power MOSFETs and integrated compensation, making it extremely efficient and capable of providing high load current up to 1.5 A. It is part of the PMIC family and classified as a DC-DC switching regulator, characterized by its high switching frequency, adjustable soft-start feature, output overvoltage/overcurrent protection, and adjustable cycle-by-cycle current limit.

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