LT1640HIS8#PBF

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Power management IC (PMIC) is a stand-alone integrated circuit that helps to manage power in a device. PMICs cover various applications ranging from full system power management and sequencing to power supply design to voltage regulation and monitoring. Hot Swap controllers are a subset of PMICs, making it easier and safer to insert and remove cards and boards from power sources. The LT1640HIS8#PBF is a logic-based hot swap controller that helps designers develop safe, reliable and highly integrated systems.

Specifications and features

The LT1640HIS8#PBF is a logic-based hot swap controller from Linear Technology (LT) which is capable of controlling the inrush current, minimizing the risk of system damage when plugged in or removed. This device consists of a current limit, enhancing circuit, turn-on control and power good system, all on one chip.

The LT1640HIS8#PBF is housed in a 8-lead PBF package and is capable of up to 20A continuous over-current protection. It has an adjustable trip point for current limiting and adjustable circuit ramp rate for achieving maximum system reliability during start-up. The LT1640HIS8#PBF also has an enable pin which is used to disable the current limit. The power on surveillance is also managed by the device whether it is enabled or by external MOSFET control.

The LT1640HIS8#PBF\'s features include over current limit, input overvoltage limit, programmable turn-on slew rate, power good signal and selectable power path using either the internal or external FETs. Its turn-on time is typically 400 ns, whereas turn-off time is 100 ns. It also can operate over an extended temperature range from -40 °C to +125 °C.

Practical Applications

The LT1640HIS8#PBF is a very versatile and intelligent power management solution for protecting and controlling the power rail of many applications such as networking, consumer electronics, industrial control, medical and automotive. It can be used to hot-swap and power boards to minimize system downtime, since it is capable of powering up and powering down circuits quickly and safely. In server applications, it is used to safely connect/disconnect memory and RAID cards without shutting down the system, so that maintenance tasks can be performed without interrupting services.

The LT1640HIS8#PBF can also be applied in game consoles, where it is used to prevent current overload during startups. In automotive systems, it is used to protect the power rail from over current, input over voltage and ground faults, while providing a minimum ramp rate during turn-on and turn-off. Additionally, it is also used in remote powering systems such as cameras and surveillance systems, which require stringent start-up and shut-down times. Ultimately, wherever system reliability, safety and reduced power management overhead are important, the LT1640HIS8#PBF is a perfect choice.

Working Principle

The LT1640HIS8#PBF works on the basis of current limiting. When an external load is applied, the device senses the over current condition and limits the current to a predefined level. When the applied load is reduced, the current returns to the safe limit. During the current limit mode, the device\'s enhanced circuit monitors and trips the power path if the current falls below the trip point or the power supply is interrupted.

The external FETs are enabled by the LT1640HIS8#PBF\'s turn-on or shut down control depending upon the given input. An enable pin is also available for manual control of power. Finally, power good contact monitors the power supply and provides a signal for the system shutdown in cases of fault or power failure.

Conclusion

The LT1640HIS8#PBF logic-based hot swap controller from Linear Technology helps designers develop safe and reliable systems while minimizing system damage during insertion and removal. It consists of features such as current limiting, enabling and the power good signal monitoring, making it the ideal choice for various applications such as industrial control, networking, game consoles and remote powering. With the ability to control the inrush current, maintain a minimum ramp rate during start-up and shut-down, and provide power good signal, the LT1640HIS8#PBF is the perfect power management solution for various applications.

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