LTC4281IUFD#TRPBF

Programmable Features:	Current Limit
Base Part Number:	LTC4281
Feature Pins:	--
Supplier Device Package:	28-QFN (4x5)
Package / Case:	28-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Current - Supply:	3.5mA
Operating Temperature:	-40°C ~ 85°C
Current - Output (Max):	--
Voltage - Supply:	2.9 V ~ 33 V
Series:	--
Features:	OVP, UVLO
Applications:	General Purpose
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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LTC4281IUFD#TRPBF Application Field and Working Principle

PMIC (Power Management IC) is a special electronic chip that controls power supply functions such as regulating the output voltage, managing the power environment, and monitoring system electrical performance. One category of PMIC is Hot Swap Controllers, which includes the LTC4281IUFD#TRPBF. It is designed to enable hot plug-in and hot plug-out (current insertion and removal when power is not present) on any types of powered circuits without risk of damage.

Overview of the LTC4281IUFD#TRPBF

The LTC4281IUFD#TRPBF belongs to Linear Technology’s family of Hot Swap Controllers. It harnesses a built-in sophisticated current limit circuit to control the current through an inserted board even before the gates of the external power MOSFETs can operate. This allows a maximum supply path rating of up to 34V and 8A with a maximum board current threshold of 6A. The device comes with a 0.1 ohm current-limit resistor on the die as well as a unique low-voltage startup and power OK tracking feature. Also featured is an internal decoupling circuit which helps reduce supply “glitching” when re-activating the gate of the n-channel MOSFET preventing it from sudden shutoffs due to the stored gate energy of the MOSFET

Input and Output Characteristics of the LTC4281IUFD#TRPBF

The LTC4281IUFD#TRPBF’s input is from a sense resistor that provides data from the amount of current going through the supply path. The 6A rated input current flows through the sense resistor, is compared to an internal 1.4A threshold setting, and passed to the output. The output voltage is dependent on the input voltage and external components being used. For instance, if the supply voltage is +5V and the external capacitors used are 0.1μF, then the output voltage would be +5V.

Operating Principles of the LTC4281IUFD#TRPBF

The LTC4281IUFD#TRPBF is an intelligent sensor that constantly monitors the current during a hot plug event. When an external device is connected to the power supply, the current increases and, upon reaching a pre-selected level, the controller turns on the external FETs. This configuration limits the output current to what has been predefined, thus preventing any physical damage to the external devices.While the device is in normal operation, when the current is below the set threshold, the controller holds the MOSFETs off, keeping the voltage constant. When the current is above the set threshold, the controller turns on the MOSFET and continuously monitors the current. If the current stays above the threshold for several consecutive cycles, the controller turns off the MOSFET. This helps protect circuits from short-circuit caused by excessive output current.

Conclusion

The LTC4281IUFD#TRPBF Hot Swap Controller is an innovative and integral part of Linear technology\'s PMIC portfolio, assisting in the safe insertion and removal of power supplies. Its on-chip current-limit circuit ensures maximum current protection during the hot plug process, while its low-voltage startup and power OK tracking feature ensures that power is present during a hot-swap event. The device\'s decoupling circuit reduces power “glitching” and helps maintain a consistent power pathway. The open-drain output keeps the supply voltage constant and offers its users maximum flexibility.

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