LT4220IGN#PBF

Series:	--
Packaging:	Tube
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Hot Swap Controller
Number of Channels:	2
Internal Switch(s):	No
Applications:	General Purpose
Features:	--
Programmable Features:	Auto Retry, Fault Timeout, Latched Fault, UVLO
Voltage - Supply:	2.7 V ~ 16.5 V
Current - Output (Max):	--
Operating Temperature:	-40°C ~ 85°C
Current - Supply:	2.7mA
Mounting Type:	Surface Mount
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Supplier Device Package:	16-SSOP
Feature Pins:	/FAULT, FB-, FB+, ON-, ON+, PWRGD, TIMER, TRACK
Base Part Number:	LT4220

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Introduction

LT4220IGN#PBF is a Hot Swap Controller from California based, Linear Technology company. It is designed for managing power sourcing and power conversion applications. By providing both thermal protection and under-voltage lockout protection for a hot-swap system, it allows for safe operation and protection of power-sourcing components such as FETs and other high-side switches.

Application Field and Working Principle

The LT4220IGN#PBF works by monitoring the voltage of an individual external component (MOSFET or other high-side switch) and detects if it is below the specified minimum level. If it is, it will take the appropriate action to disconnect the external component and thus protect the system by preventing it from reaching an unsafe or overvoltage state.The LT4220IGN#PBF can be used in a number of applications, such as typically in power-sourcing applications that have an external component such as an FET or a high-side switch. This may include powering up Power over Ethernet (PoE) ports, powering large telecom systems, powering radio-frequency (RF) devices, and powering other electronics within the Telecom and power industries.More specifically, it is designed to monitor the voltage of the external component and detect if it is below the specified minimum level. In this way, it provides protection for the power source by preventing it from reaching an unsafe or overvoltage state.When a Hot Swap Controller like the LT4220IGN#PBF is used, it helps to ensure that any devices connected to the power source are not subjected to excess voltage and that they are not damaged while they are in the process of being unplugged or plugged in. This is especially important for powering up Power over Ethernet (PoE) ports, where sudden disconnection or overvoltage can cause damage to sensitive electronics.The LT4220IGN#PBF is also designed to monitor the current that passes through its external component, as well as providing thermal protection features. This is to help ensure that the current being drawn is not in excess of the safe operating level. If the current is too high, it will trigger a Thermal Shutdown warning or, in some cases, a Fault Display feature.

Conclusion

The LT4220IGN#PBF from Linear Technology is an excellent choice for power sourcing and power conversion applications. It offers both thermal protection and under-voltage lockout protection for a hot-swap system, allowing for safe operation and protection of power-sourcing components such as FETs and other high-side switches. It can also be used to monitor the voltage of the external component and provide added protection of a power source against unsafe or overvoltage conditions. Additionally, its thermal protection and Fault Display features help to ensure that any devices connected to the power source remain safe and undamaged.

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