LT3651EUHE-8.4#PBF

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LT3651EUHE-8.4#PBF Application Field and Working Principle

The LT3651EUHE-8.4#PBF is a high efficiency, step-down converter for portable battery powered systems and other applications with low voltage power sources. The device is available in a 5mm x 6mm Pb-free, thermally enhanced QFN-32 package, and integrates two integrated FETs with low resistances to increase efficiency and reduce system cost. The LT3651EUHE-8.4#PBF can accept a wide input voltage range of 2.9V to 6.6V while it can deliver an adjustable output voltage of 0.8V to 5.5V. This device also provides high power density, with up to 8A of peak output current and delivers 97% efficiency using two integrated N-channel MOSFETs, reducing size and cost.

The LT3651EUHE-8.4#PBF is a Pulse Width Modulated (PWM) switching regulator designed to reject fixed frequency ripple and supply clean, constant voltage. It also offers an adjustable soft-start function, allowing the output voltage to ramp up or down linearly at the beginning of the operation. The LT3651EUHE-8.4#PBF also has a short-circuit protection circuit, equipped with temperature compensation, as well as auto-cache, thermal shutdown and under-voltage lock-out (UVLO) protection. All these features make the LT3651EUHE-8.4#PBFconvenient and more adaptable to use, including on-board battery-powered design applications.

In general, the LT3651EUHE-8.4#PBF can be classified as a PMIC - Battery Chargers, due to its wide range of applications and charging capabilities. A PM IC is an integrated circuit used to monitor and control the charging of batteries. Such ICs typically integrate several power management functions, including voltage regulation, current control, and temperature compensation, as well as other features. Battery charging ICs, such as the LT3651EUHE-8.4#PBF, are designed to charge single-cell and multi-cell Li-ion and Li-polymer batteries in order to extend battery life and reduce cost.

The working principle of the LT3651EUHE-8.4#PBF is relatively simple. A voltage step-down switching regulator includes two main components: an inductor, which is used to store large amount of energy, and a switch, which is used to control the amount of energy supplied to the output. The LT3651EUHE-8.4#PBF charges the battery at a constant voltage and current, which is predetermined by the device configuration. The switch of the oscillates in a closed loop between the input and output and alternately magnetizes the inductor, producing a charging current for the battery. The current flows in a cyclic manner allowing for a pulsed switch which helps to minimize heat. The time for which the switch is closed is typically referred to as the duty cycle and is used to control the amount of power supplied to the output.

To summarize, the LT3651EUHE-8.4#PBF is a high efficiency, step-down converter suitable for portable battery powered systems and other applications with low voltage power sources. This device offers an adjustable output voltage of 0.8V to 5.5V, with high power density and up to 8A of peak output current. It is classified as a PMIC - Battery Chargers, due to its wide range of applications and charging capabilities. The working principle of the LT3651EUHE-8.4#PBF is relatively simple. A voltage step-down switching regulator includes a switch and an inductor, which stores large amounts of energy, controlling the amount of energy supplied to the output.

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