LT1640ALIN8#PBF

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LT1640ALIN8#PBF is a hot swap controller integrated circuit manufactured by Linear Technology. It provides voltage monitoring and controlling of hot-swappable, high power circuits and systems, allowing them to be safely connected and disconnected while the system remains powered up. The LT1640ALIN8#PBF is designed to protect the power system in applications with non-isolated DC-DC buck converters, high current load switches, and Hot Swap applications involving multiple power sources.

The LT1640ALIN8#PBF includes a 1.6A current limit, undervoltage lockout (UVLO), configuration pin-strap, digital soft-start and current sharing features. It supports discharge and recharge procedures to ensure safe connections and disconnections under load and features an active pull-down circuit to quickly discharge capacitors downstream of the load switch during power-off. This device is available in a Pb-free 14-lead DSBGA package.

Application Fields

The LT1640ALIN8#PBF is ideally suited for a wide range of applications, such as those in communication, networking and storage systems, servers and storage systems, motor controls, LED lighting, and other industrial systems with high power I/O requirements. It is especially useful in systems that need to perform power-on reset, hot-swap and current limit protection.

This device also serves as an ideal voltage monitoring and control solution in high power systems, allowing them to be safely disconnected while maintaining power. The current limiting circuitry ensures safe connections and disconnections even under load. It is also widely used in applications where power supply sequencing, power-on reset, and load isolation from hot-swapping circuitry is required.

Working Principle

The LT1640ALIN8#PBF ensures safe connections and disconnections under load by controlling the inrush current and protecting the system from over-voltage and over-temperature conditions. Its integrated circuit contains two power MOSFETs which are configured in a buck converter configuration. During power-on, the internal buck converter steps up the voltage to the pre-set level, enabling the application circuit to start operating. The internal current limit feature allows for precise control over the inrush current ramp-up.

When disconnecting from the load, the device internally pulls its outputs down quickly to release the capacitors downstream of the load switch, thus avoiding any post-disconnection voltage surge. The internal UVLO feature prevents an output voltage from exceeding the specified voltage threshold during power-on. This device is packaged in a 14-lead DSBGA package which provides a very compact design with improved thermal performance.

In conclusion, the LT1640ALIN8#PBF is an ideal integrated circuit for hot swap applications and high power I/O systems. The integrated current limit and UVLO features ensure safe connections and disconnections while protecting the system from overvoltage and over temperature conditions. Its compact packaging, low power consumption and wide operating temperature range make it suitable for use in a variety of applications.

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