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PMIC - Hot Swap Controllers

The LTC4261CUFD-2#PBF is designed to protect hot inserts while minimizing total power dissipation and providing supervisor functionality. It has been designed to allow maximum flexibility in controlling its operation with a variety of pin-strap, active-low enable inputs. This part is suitable for use as a hot swap controller in power supplies and other circuits needing both inrush current limiting and undervoltage protection.

Application Field

The LTC4261CUFD-2#PBF is ideal for many applications which includes, but is not limited to, servers, telecommunications, and networking. It is best suited for applications that require an active-high output signal to denote a fault or disable condition. It can also be used in applications that require a logic-controlled current limit.

Working Principle

The LTC4261CUFD-2#PBF provides a current limit on the power supply input, which is sensed by a sense resistor. If the limit exceeds a set limit, then the part will disable the input and signal a fault. The current limit is adjustable and can be programmed to the desired level by adjusting the external resistor between the CS and RT terminals. Once the user-programmed current limit is exceeded, the output of the SHDN pin goes low and the input is disabled. The part features a TTL compatible UNDERVOLTAGE signal, which goes low when the input voltage becomes too low. This pin can be used to disable the input in the event of an undervoltage condition.

Conclusion

The LTC4261CUFD-2#PBF provides accurate and powerful hot swap control. It features an adjustable current limit, fault signal, and internal undervoltage detection and is easy to use and configure due to its adjustable resistor. The device is suitable for use in power supply, telecommunication, and networking applications.

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