LT8619IMSE-5#TRPBF

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The LT8619IMSE-5#TRPBF is a monolithic DC/DC power conversion integrated circuit specifically designed for use in portable systems where size and efficiency are paramount. The device combines a synchronous boost converter, low quiescent current linear regulator and highly efficient power MOSFETs in a small, 8-lead ThinSOT package. The synchronous boost converter operates from input voltages as low as 3V and supports output voltages up to 18V with a guaranteed 4V minimum start-up input voltage. The LT8619IMSE-5#TRPBF has two independent running modes: discontinuous conduction mode (DCM) for light loads, and continuous conduction mode (CCM) for heavier loads.

The LT8619IMSE-5#TRPBF combines a modern architecture with internal compensation to significantly reduce the size and cost of the regulated power supply, while providing outstanding efficiency and very low quiescent current. Its inherently high frequency allows the use of very small, low cost inductors and capacitors. Combined with the ability to run in either DCM or CCM, the user can optimize the final design for size, cost and efficiency.Due to its wide input range and very low quiescent current, the LT8619IMSE-5#TRPBF is ideally suited for applications such as cellular phones, PDAs, portable MP3 players and other battery-powered equipment.

Application Field of LT8619IMSE-5#TRPBF and Working Principle

The main application field of the LT8619IMSE-5#TRPBF is portable equipment such as cellular phones, PDAs, portable MP3 players and other battery-powered equipment due to its wide input range and very low quiescent current. The LT8619IMSE-5#TRPBF also combines a modern architecture with internal compensation to significantly reduce the size and cost of the regulated power supply, while providing outstanding efficiency and very low quiescent current.

The working principle of the LT8619IMSE-5#TRPBF involves the use of two independent running modes: discontinuous conduction mode (DCM) for light loads, and continuous conduction mode (CCM) for heavier loads. In DCM, the inductor’s current drops to zero every cycle, showing discontinuous current flow. Meanwhile, in CCM, the inductor’s current is continuous and flows in the same direction as the input voltage much of the time, which is especially suitable for higher output current and higher efficiency.

The trickle-charging start-up technique is employed by the LT8619IMSE-5#TRPBF, which is a process in which the chip supplies a tiny current to ensure that the output voltage rises slowly, even when the input voltage is low. This ensures a safe and reliable power supply even in challenging conditions.

In addition, the LT8619IMSE-5#TRPBF includes a low quiescent current linear regulator which provides essential bias current to the system.

The LT8619IMSE-5#TRPBF also has Active Burst Mode® operation, which significantly reduces the quiescent current over a wide operating load range for achieving ultra low power consumption.

The LT8619IMSE-5#TRPBF also uses adjustable soft-start circuitry to limit the inrush current during start-up, which lowers in-rush current noise and stress on components.

Conclusion

The LT8619IMSE-5#TRPBF is one of the finest integrated circuits available on the market today, specifically designed for use in portable systems where size and efficiency are paramount. Its wide input range and very low quiescent current allow it to be used in applications such as cellular phones, PDAs, portable MP3 players and other battery-powered equipment. The modern architecture and internal compensation of the LT8619IMSE-5#TRPBF allows the user to optimize the final design for size, cost and efficiency, while the dual-mode operation of this device ensures both a safe and reliable power supply even in challenging conditions. The adjustable soft-start circuitry also helps to limit in-rush current noise and stress on components, and the Active Burst Mode® significantly reduces quiescent current over a wide operating load range for achieving ultra-low power consumption.

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