LTC4229CUFD#PBF

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PMIC - Hot Swap Controllers

The LTC4229CUFD#PBF is designed to be a hot swap controller that regulates inrush currents, protects power supplies, and safely powers up and down circuits, such as those found in telecommunications, datacom and industrial systems. The device is designed to allow the full hot swap power up of voltage rails, while preventing inrush currents that could damage systems, restrict other parts of the system, and reduce system reliability.

The LTC4229CUFD#PBF features an input voltage range of 3V-38V, and includes an internal power MOSFET that can regulate a system\'s input to an output between 0.5V and VIN-7.5V. It features an adjustable soft-start feature, allowing designers to control and manage the inrush current. An absolute maximum inrush current limit of 8A and thermal shutdown of 55°C protect against overload of devices or the overall system.

In order to achieve this purpose, the main working principle of the LTC4229CUFD#PBF is as follows: The device uses a series of MOSFETs and/or non-compensated voltage references to regulate the output voltage, while also controlling an internal PMOS which acts as a switch, allowing power to flow above a certain threshold. This threshold is determined by the VTH pin, which is a sense input pin on the LTC4229CUFD#PBF. Once the voltage on this pin reaches 6V, the PMOS is activated, providing the output voltage with a soft-start ramp.

In addition to the PMOS, the LTC4229CUFD#PBF also includes overvoltage protection circuitry and reverse current supply blocking. This is provided by a series of FETs, allowing for adjustable overvoltage protection. The device also includes built-in open-circuit, short and thermal protection limiting, allowing the voltage supplied to the onboard circuitry to be monitored and ensured that it does not exceed the limits necessary for proper operation.

The LTC4229CUFD#PBF can be used in a hot-swap application, where it is configured as a P-channel switch with externally applied positive temperature coefficient (PTC) current-sensing resistors. It also offers adjustable slew-rate control which provides slower start-up times to reduce input current transients. This feature can be used to control inrush currents as well as provide a control point for pre-charging capacitors prior to supply-up.

In applications where the LTC4229CUFD#PBF is used as a hot swap controller, it is important to ensure the operational safety and reliability of the circuit. In these cases, the LTC4229CUFD#PBF provides a number of features to provide system protection. These features include a current limit circuit, which provides an adjustable limit to the current that an attached device can draw, an overvoltage protection circuit, which can be used to precisely regulate the supplied voltage, current-sensing auto-restart, and a power-up sequencing.

In summary, the LTC4229CUFD#PBF is a hot swap controller designed to regulate inrush currents and protect power supplies. Its adjustable soft-start feature also allows designers to precisely control the start-up process of the device power. In addition, it also provides a number of protection features, such as an adjustable current limit, overvoltage protection, and power-up sequencing. Collectively, these features make the LTC4229CUFD#PBF a robust device for hot swap applications.

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