LTC4218CDHC-12#PBF

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The LTC4218CDHC-12#PBF controller is a low-impedance monitoring IC that provides hot-swap control for systems with significant bus capacitance. This device is designed with a built-in current limit threshold that delivers protection from in-rush currents up to 12A and higher when used with an LTC7104. It provides protection from reverse-battery damage via lockout, open-load detection, and a capacitor or resistor-programmable normal-mode cell voltage monitor.

In addition to providing fast in-rush current limit and reverse-battery protection , the LTC4218CDHC-12#PBF controller also features an over-temperature protection circuit . The controller monitors the temperature of incoming power and provides an output signal to alert the system of impending temperature issues. This helps prevent damage to system components that may result from excessively high temperatures. Moreover, the controller is designed to operate over a range of input voltages from 3.3V to 26V.

Application Field

The LTC4218CDHC-12#PBF controller is a simple, flexible, and cost-effective solution for hot-swap or power supervision applications. It is ideal for hot-swap supplies , e.g. PRRs, active backplanes and communications systems, as well as on-board or extraneous power supplies. This device is also suitable for robust solutions including automotive, avionics, and communications equipment.

The LTC4218CDHC-12#PBF is also a perfect fit for use with DC/DC converters and point-of-load (POL) regulators, offering a level ofaccuracy that is difficult to achieve with other devices . With its adjustable current sense threshold (via an external resistor), the LTC4218CDHC-12#PBF provides a more accurate inrush current limit. In addition, this device eliminates the need for external power sequencers and can manage hot-swap supply transients.

Working Principle

The working principle of the LTC4218CDHC-12#PBF is based on the control and monitoring of hot-swap or power systems. When the incoming voltage is within specification, the supply voltage is monitored and the output is enabled. If the voltage level is greater than the set level, an overvoltage monitoring circuit is enabled and the output is suspended. Similarly, if the input voltage is lower than the set level, an undervoltage monitoring circuit is enabled and the output is suspended.

When an inrush current is detected, the LTC4218CDHC-12#PBF controller uses a current-sensing circuit to monitor the incoming current. The current limit threshold can be set by a single resistor on the device. Once the threshold is exceeded, the current-limiting circuit is enabled and the output is shut down. The device is designed to be tolerant of momentary inrush current pulses due to its fast response time.

The LTC4218CDHC-12#PBF provides hot-swap protection by monitoring the status of the load. If the load current is greater than 7A, the device will shut down the output. This ensures that the system or board is not damaged due to excessive current. Additionally, the LTC4218CDHC-12#PBF folds back the output voltage when the load current is between 2A and 7A; this helps reduce power dissipation.

The device also offers protection against reverse battery connection. When connected, the output is disabled and a lockout function is activated. This prevents the system from being damaged due to improper wiring.

Conclusion

The LTC4218CDHC-12#PBF controller is the perfect solution for hot-swap or power supervision applications. It is capable of handling up to 12A of inrush current and offers protection against reverse battery connection. This device is also designed to work over a range of voltages from 3.3V to 26V, making it suitable for a wide range of systems. In addition, the LTC4218CDHC-12#PBF offers precise current limit control and fast response time, making it a reliable and cost-effective solution.

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