LTC4251-1IS6#TRMPBF

Programmable Features:	Circuit Breaker, Current Limit, Fault Timeout, OVP, UVLO
Base Part Number:	LTC4251
Feature Pins:	(UV, OV), TIMER
Supplier Device Package:	SOT-23-6
Package / Case:	SOT-23-6 Thin, TSOT-23-6
Mounting Type:	Surface Mount
Current - Supply:	800µA
Operating Temperature:	-40°C ~ 85°C
Current - Output (Max):	--
Voltage - Supply:	-72 V ~ -36 V
Series:	--
Features:	Latched Fault
Applications:	-48V
Internal Switch(s):	No
Number of Channels:	1
Type:	Hot Swap Controller
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

The LTC4251-1IS6#TRMPBF is a versatile hot swap controller from Linear Technology\'s family of Passive Matrix Interface Controllers (PMICs). This device integrates current limiting, automatic reverse current sensing, under-voltage and over-voltage monitoring, current-limit status output as well as ON/OFF control in a single package.

Performance Features of the LTC4251-1IS6# TRMPBF

The LTC4251-1IS6# TRMPBF integrates a wide variety of features to provide reliable, safe and flexible hot-swap protection solutions. These features include:* Current Limiting – The device is able to continuously monitor input power, while limiting the current to prevent inrush/overload. * Reverse Current Blocking – The device is able to automatically detect and block reverse current, thereby ensuring safe hot-swapping for applications. * Under-Voltage Protection – The device is able to detect and respond to low voltage overloads in order to safely power-down the system. * Over-Voltage Protection – The device is able to detect and respond to high voltage overloads to prevent damage to the system. * Current-Limit Status Output – The integrated status output pin provides feedback in the event of either over-current or reverse current detection. This allows the system to respond accordingly.* ON/OFF Control – The integrated ON/OFF control pin provides the ability to remotely control the power-up and power-down functions of the device.

Application Field of the LTC4251-1IS6# TRMPBF

The LTC4251-1IS6# TRMPBF is designed to provide protective and functional hot-swap control solutions in a variety of applications. These include, but are not limited to, industrial server solutions, communications, data, and storage systems, as well as industrial machinery, robotics, and automotive solutions. In addition, the device is also suitable for a wide range of bus-powered devices, such as disk drives, LCD displays, power supplies, and USB hubs. In fact, the device is capable of providing hot-swap protection for multiple boards even when their power train voltages vary by up to 10V.

Working Principle of the LTC4251-1IS6# TRMPBF

The LTC4251-1IS6# TRMPBF is designed to integrate current limiting, reverse current sensing and overvoltage/undervoltage protection into a single package. To ensure reliable operation, the device monitors the voltage and current at its input. When the voltage exceeds the over-voltage trip point, the device automatically triggers its over-voltage protection. Similarly, if the voltage falls below the under-voltage trip point, the under-voltage protection is triggered and the device shuts down. The over-voltage and under-voltage protection provide a secure safeguard against voltage irregularities. On the other hand, in order to prevent damage due to inrush/overload, the device is equipped with a current-limit circuit. This circuit limits the current to a predetermined safe level, and monitors the current to prevent excessive inrush/overload. In addition, the device is also able to detect and block reverse current to ensure safe hot-swapping. Furthermore, the device is also equipped with a status output pin. This pin is triggered when the current exceeds the limit and indicates either over-current or reverse current detection. Once triggered, the status output pin allows the system to respond accordingly.

Conclusion

The LTC4251-1IS6# TRMPBF from Linear Technology provides a wide range of features that deliver reliable hot-swap protection solutions for a variety of applications. It integrates current limiting, reverse current sensing, under-voltage and over-voltage monitoring, current-limit status output as well as ON/OFF control in a single package. The device is suitable for a wide range of bus-powered devices and is capable of providing hot-swap protection for multiple boards even when their power train voltages vary by up to 10V.

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