LTC4224IDDB-2#TRMPBF Integrated Circuits (ICs)

Programmable Features:	Current Limit, Slew Rate
Base Part Number:	LTC4224
Feature Pins:	/FAULT, /ON1, /ON2
Supplier Device Package:	10-DFN (3x2)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Current - Supply:	1.4mA
Operating Temperature:	-40°C ~ 85°C
Current - Output (Max):	--
Voltage - Supply:	1 V ~ 6 V
Series:	--
Features:	Auto Retry, Fault Timeout, UVLO
Applications:	General Purpose
Internal Switch(s):	No
Number of Channels:	2
Type:	Hot Swap Controller
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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PMIC - Hot Swap Controllers

PMIC (Power Management Interface Controller) refers to power management IC, which is used to achieve better performance, longer fatigue endurance and higher efficiency of electronic products. Hot swap controllers are the power management interfaces for power on and protection of loads, which can protect them from sudden power on, so as to prevent poor performance due to unexpected digital processor operation or inrush current impact. LTC4224IDDB-2#TRMPBF is a digital Hot Swap controller IC that eliminates the need for manual power sequencing or bulky external bipolar transistor-based level shifting requirement to protect the load from current inrush.

Overview of LTC4224IDDB-2#TRMPBF

LTC4224IDDB-2#TRMPBF is a Hot Swap controller with ULTRAFETpowerenabled inputs. This device has an input voltage range of 6.5V to 32V, a wide common mode voltage range, and an operating temperature range of -40 to +105 degrees Celsius. It offers a low quiescent current of 95uA/A and an adjustable low threshold voltage of 18.5V to 36V. The controller utilizes external n-channel MOSFETs for fault detection, under-voltage lockout protection, and softstartcurrent limiting. It is designed to protect from current inrush, latchoff faults, and surges that may occur in the system, and alert the load if needed.

Application fields

Due to its advantages such as low quiescent current, adjustable low threshold and wide operating temperature range, LTC4224IDDB-2#TRMPBF is suitable to be applied in many application fields. First, it can be used as a UPS controller in many outdoor applications such as electric vehicles, emergency construction equipment, and outdoor power supplies. Second, it is a great option for hot-swapping circuit boards in indoor applications that require uninterrupted, zero-risk emergency power. It accelerates warm-ups and cooling-downs, simplifying intricate power-on/power-off requirements. Third, LTC4224IDDB-2#TRMPBF is an ideal option for systems with high voltage toggling requirements, such as high-voltage power supplies for solid state lighting. Finally, with the ability to manage and protect the load from current inrush, under-voltage lockout, and fault protection, it is suitable for use in servers, routers, and various high speed data communications systems.

Working Principle

The working principle of the LTC4224IDDB-2#TRMPBF is based on monitoring the output voltage of the external MOSFETs and comparing it with the predetermined logic levels. The circuit is powered up either through a manual switch or an interrupt signal. A resistor divider network sets a suitable voltage level for the fault conditions. After the voltage reaches its threshold, the device activates a PWM function, which extends the voltage. The device then monitors the minimum PWM voltage to ensure the safe turn-on of the load. Once the load is connected, the device monitors the output voltage at the gate of the MOSFETs, and if the voltage is less than the predetermined logic levels, it will turn off the load. The output voltage of the MOSFETs is compared with the voltage provided by the resistor divider network. The device also monitors the voltage at the gate of the MOSFETs in order to protect the system from destructive faults like short circuits or power inrush. If the voltage rises above the predetermined logic levels, then it will immediately turn off the load. In addition to this, the device also provides adaptive fault protection and monitoring. With its thermal effect compensation feature, it extends the safe operating temperatures of the system. It monitors the temperature of the system and limits the current if the temperature surpasses the specified levels. It also monitors the voltage at the gate of the MOSFETs to ensure the safety of the system.

Conclusion

LTC4224IDDB-2#TRMPBF is a digital Hot Swap controller IC that eliminates the need for manual power sequencing or bulky external bipolar transistor-based level shifting requirement to protect the load from current inrush. It has an input voltage range of 6.5V to 32V, a wide common mode voltage range, and an operating temperature range of -40 to +105 degrees Celsius. It offers a low quiescent current of 95uA/A and adjustable low threshold voltage of 18.5V to 36V. LTC4224IDDB-2#TRMPBF is suitable to be applied in many application fields, such as UPS controller, hot-swapping circuit boards, high voltage toggling, and high speed data communication systems. Its working principle is based on monitoring the output voltage of the external MOSFETs and comparing it with the predetermined logic levels. The device also provides adaptive fault protection and monitoring. Functionally, it is a great device for hot swapping with reliable protection.

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