LTC4253ACGN#PBF

Programmable Features:	Circuit Breaker, Current Limit, Fault Timeout, OVP, UVLO
Base Part Number:	LTC4253
Feature Pins:	DRAIN, EN2, EN3, OV, /PWRGD1, /PWRGD2, /PWRGD3, RESET, SS, SQTIMER, TIMER, UV
Supplier Device Package:	16-SSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Current - Supply:	1.1mA
Operating Temperature:	0°C ~ 70°C
Current - Output (Max):	--
Voltage - Supply:	-48V
Series:	--
Features:	Latched Fault
Applications:	-48V
Internal Switch(s):	No
Number of Channels:	1
Type:	Hot Swap Controller, Sequencer
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tube

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LTC4253ACGN#PBF Application Field and Working Principle

PMIC - Hot Swap Controllers are a type of integrated devices that enable reliable insertion and removal of boards and modules under full load in a live circuit. The commonly used units in this category are the LTC4253ACGN#PBF and its variant. These devices enable the monitoring, protection and management of hot swappable power supply systems. The LTC4253ACGN#PBF is an active equal current hot swap controller with an in-rush current limit of 50A. It operates with current limitations of 1A up to 50A. This device is intended for use in applications where quick removal of a load may be necessary. It ensures minimal disruption when hot swapping components, and also provides current limiting, current monitoring and over voltage protection for powered devices. It also features a low power shutdown mode for power conservation.

Design & Features

The LTC4253ACGN#PBF has a combination of features that make it suitable for use in hot swap applications. It is designed to be configured with two programmable inputs, one input that can be set for over-voltage, under-voltage and over power detection, and another for over-temperature detection. It also features an output capacitor and a resistor to configure the current limit from 1A up to 50A. An optional automatic discharge mode is available to safely discharge the output when powering down, and an interrupt output is included to indicate an active fault condition. A low quiescent drain current helps to conserve power, and a low voltage lockout feature prevents the device from turning on if the input voltage is too low.

Working Principle

The LTC4253ACGN#PBF works by actively adjusting the impedance of the circuit in which it is housed. When current begins to flow through the output, the device limits the current by increasing the impedance to a predetermined level. This is done by controlling the duty cycle of the P-Channel MOSFET switch that connects the load with the power rail. The duty cycle of the MOSFET switch is in turn controlled by the average current sense voltage and the settings of the two programmable input pins. The duty cycle of the MOSFET switch continues to adjust, up to the point where the predetermined current limit is reached, at which point the current begins to cycle around the set limit. General features such as overcurrent protection, over-temperature shutdown and white/blacklisting of hot-swappable output devices are managed by the node controller. This can be used to monitor the current consumption of important components, and prevent them from overloading when hot swapping.

Conclusion

The LTC4253ACGN#PBF is a useful device for controlling the current in hot swappable power supplies. It incorporates safety features such as over-voltage and over-temperature protection, as well as current limiting and monitoring capabilities. Its ability to act as a node controller can be extremely useful in managing important components during hot swapping. All of these features make it an ideal choice for applications that require precautionary monitoring and protection of hot-swappable power supplies.

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