LTC1645IS#TRPBF

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Power Management Integrated Circuit (PMIC) is an essential component for controlling power and managing the electrical energy in any electronic system. Hot Swap Controllers, a kind of PMIC, provide the reliable power supply function for hot-swapping circuits on-the-fly without additional protection devices. LTC1645IS#TRPBF is an example of Hot Swap Controllers. This article will discuss the application field & working principle of LTC1645IS#TRPBF.

1. Application Field of LTC1645IS#TRPBF

LTC1645IS#TRPBF is designed to provide the power supply function in Hot Swap applications, while controlling current up to 15A and suppling the input voltage up to 40V. It is capable of handling the low current deep sleep mode with low input start voltage. Additionally, its high reverse polarity protection and low output voltage detect provide extra protection to the circuits.

This hotswap controller offers ±1.5% output voltage accuracy and <50ppm/oC temperature coefficient. Also, the PFM Switch Mode is employed to reduce the static power consumption and provide low output voltage ripple.

Due to its high power reliability and a comprehensive protection, LTC1645IS#TRPBF is widely used in applications demanding a hot-swap circuit such as telecommunications, computing systems, automotive systems, industrial equipment, and consumer electronics.

2. Working Principle of LTC1645IS#TRPBF

The LTC1645IS#TRPBF is a highly flexible power supply IC that incorporates a current sense amplifier, Peak Current Mode Controller, integrated low on-resistance MOSFET ,an over current protection and reverse polarity protection to create a complete power supply solution. Its Peak Current Mode Controller limits the circuit current to the desired level through sensing the voltage across the MOSFET.

It will start to charge the output capacitance with a rising ramp during the start-up sequence. When the output voltage reaches the regulated level, the integrated MOSFET will turn off and holds the voltage at the desired level. A negative temperature coefficient Current Sense Amplifier is employed in order to reduce the output voltage ripple.

To further enhance the performance of the hotswap controller, integratedlow voltage supervisors, open current sense DAC and drivers are also included on chip. This eliminates the need for an external voltage supervisor and requires only minimal external components.

Conclusion

To sum up, LTC1645IS#TRPBF is an excellent Hot Swap controller for various applications. The full repertoire of features, such as accurate output regulation, low start up voltage, reverse polarity protection, low voltage supervisor and OCP, provide it with extra power reliability and protection. It is widely used in telecommunications, computing systems, automotive systems, industrial equipment, and consumer electronics.

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