LTC4214-2IMS#TRPBF

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Power Management Integrated Circuit (PMIC) is an important basis for providing power to systems such as computers and mobile phones. PMICs are specialized circuits that help to supply clean power signals to integrated circuits in the circuit, or to provide protection from overvoltage or overcurrent. Hot Swap Controllers are one kind of power related PMICs, which protect the powered circuit from sudden and transient inrush currents during the power-up sequence. The LTC4214-2IMS#TRPBF is a PMIC - Hot Swap Controllers, which offers protection and control for loads referenced to two supplies.

Features

The LTC4214-2IMS#TRPBF is designed to control the power supply to a Logic-Level N-channel MOSFET located between two supplies, V+ and V-, to supply power to a load. The features of the LTC4214-2IMS#TRPBF include:

• LS and Shutoff FET driver output slew rate programmable.
• Overvoltage tolerant to 28V.
• Undervoltage lockout with adjustable hysteresis.
• Programmable supply current limit up to 3.5A.
• Programmable inrush current limit.
• Programmable over-temperature shutdown.
• Input from VCC, IOUT or VOUT.
• 2-Wire SMI interface with write-only access.
• Open drain power good flag.

Working Principle of LTC4214-2IMS#TRPBF

The LTC4214-2IMS#TRPBF prevents an inrush current during power up, which could damage the load. The device is capable of controlling supply currents of up to 3.5A. The device operates as an adjustable current-limiting Power Path controller for hot swapping applications. During a cold start, the device limits the inrush current to prevent power-up glitches. When the voltage at V+ exceeds the undervoltage threshold (VUVLO), the internal logic of the device enables the FETs. The two N-Channel MOSFETs (LS, Shutoff FET) are driven simultaneously to allow current to flow from V+ to V- and to the load. The current limit is adjustable via the on-board current sensing resistor and over temperature shutdown is also available. Once the load is powered up and the voltage at V+ reaches the UVLO threshold, the FETs are disabled and the current is limited.

Application Field

The LTC4214-2IMS#TRPBF can be used in a wide range of applications such as notebook computers, smart phones, consumer electronics, medical and automotive applications where hot-swaps are required. The device is ideal for powering DSPs, FPGAs and ASICs as well as for powering high-end graphics cards and motherboards.

Conclusion

The LTC4214-2IMS#TRPBF is an important PMIC - Hot Swap Controllers which can provide clean power signals to electronic products in order to protect them from sudden inrush currents during power up. The device has a wide range of application fields and its adjustable current-limiting power path can make it a desirable choice for hot-swap applications.

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