LTC4225CGN-1#TRPBF

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Power management integrated circuits (PMICs) are an important component of modern electronics, allowing efficient control over the flow of energy within a board, particularly in the context of equipment hot-swapping condition. This article discusses the application field and working principle of the Linear Technology LTC4225CGN-1#TRPBF Hot Swap Controller PMIC.

What is LTC4225CGN-1#TRPBF?

The LTC4225CGN-1#TRPBF is an integrated circuit from the Hot Swap Controllers family from Linear Technology. It is a member of the Lowest Loss Hot-Swap Controllers with N-Channel Gate Drivers series. It resides in the 20-Lead TSOP package.

Features and Benefits

The LTC4225CGN-1#TRPBF offers enhanced features and benefits that allow high-reliability. Such features and benefits include:

• Undervoltage, overvoltage and overtemperature protection.
• Fault condition time-out pre-set to prevent current surge and output short circuit.
• Gate drive circuitry that is fast enough to limit switch node ringing.
• Rail-to-Rail inputs which permit control of power supply rail voltages up to 20V.
• An Enable input to shut down the system safely.
• Enhanced power-up sequencing capability.
• 10-Volt gate drive allows use with high resistance MOSFETs
• Internal bi-directional current sensing.
• Automatic soft-start cycling to prevent inrush current.

Application Fields

Hot Swap Controllers are becoming increasingly popular, due to the ability to safely disconnect and replace components without powering down the system. The LTC4225CGN-1#TRPBF allows for hot swapping in single-board computers, network routers and switches, industrial automation systems, plus many other applications. To guarantee reliable operation, the device uses UVLO and OVLO protection, as well as an active over-temperature reset. Additionally, it can also be used to control the on/off sequence of power supplies, external devices and system rails.

Working Principle

The LTC4225CGN-1#TRPBF integrates protection, detection and control circuitry in a single-phase solution. The operation of the controller is based on the voltage waveforms appearing at its pins to detect fault conditions. The controller features an internal linear regulator, which controls the gate drive voltage of the N-channel MOSFET connected to it. When an externally-supplied voltage is applied to the R_R and BST pins, the device’s internal regulator produces a pair of drive signals, which activate the gates of the MOSFET.

During normal operation, when an external voltage is applied to the R_R and BST pins, the internal regulator produces a pair of drive signals, which activate the gates of the MOSFET. During a fault condition, the UVLO, OVLO and OTS protection circuits detect the fault condition and very quickly switch the internal regulator in to shutdown mode, disconnected the gate driver from the gate of the MOSFET. Moreover, the LTC4225CGN-1#TRPBF enables hot-swapping of devices with its Fast Disconnect feature. In order to ensure that the system remains stable during hot-swapping operations, the controller also contains adjustable current limit, soft-start and fault time-out features.

Conclusion

The LTC4225CGN-1#TRPBF Hot Swap Controller PMIC is an important component of modern electronics. It allows efficient control over the flow of energy within a board, particularly in the context of equipment hot-swapping conditions. It integrates protection, detection, and control circuitry in a single-phase solution, as well as features such as UVLO, OVLO, and OTS protection; adjustable current limit; and Fast Disconnect. The controller is suitable for use in single-board computers, network routers and switches, industrial automation systems, and many other applications.

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