LTC4425EDD#TRPBF

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LTC4425EDD#TRPBF is an advanced power management integrated circuit (PMIC) employed primarily for voltage and current-limiting functions. This IC is part of a specialized PMIC segment and finds its application in computers, embedded systems, medical, automotive and telecommunications equipment. Operating frequency of the IC ranges from DC-20MHz, while voltage range it can regulate extends from 1V-39V.

The Pinout diagram of LTC4425EDD#TRPBF comprises of 8 pins. Tapping the power input is recommended and consequently a shunt resistor and a bypass capacitor to limit noises is also suggested to ensure dependable performance. The input voltage is applied to VIN, pin 1, of the IC and VOUT, pin 8, is used to connect to the load.

It uses Low Gate Charge Field Effect Transistors (FET) technology for the implementation of fault tolerant capabilities and provides short circuit protection. The user programmable current limit can be adjusted by connecting a resistor between CLK and CLKG pin. The IC also has a resistor which senses the maximum current limit of the load before protection is triggered.

The IC contains two voltage-controlled FETs to limit the in-rush current and protect the system from faults. The limiter works by constantly monitoring the current flowing in the system. The limiting action varies in proportion to the voltage applied across it, meaning higher voltage implies higher current and vice versa.

The device behaves differently depending on the type of fault. At startup, all the current flows through the first transistor until the voltage crossing the sense resistor reaches the programmed voltage. The low voltage also indicates a fault and his case the limiter turns off both FETs to protect the system. During inrush current, both FETs turn on but turn off as soon as the inrush current decreases.

Apart from the supply voltage and the maximum current limit, the limiter also provides two outputs i.e. CLK and CLKG. CLK is used for signal power-good when the voltage across the sense resistor is below the programmed value, and CLKG is used for signal power-failure when voltage across the sense resistor is above the programmed value.

In summary, LTC4425EDD#TRPBF is a specialized PMIC for use in computers, embedded systems, medical, automotive and telecommunications equipment. It has a wide operating range and includes two FETs for current limiting. The IC also provides two output signals to indicate the state of power in the bounded system.

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