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PMIC - Voltage Regulators - Linear + Switching

The LT3645EMSE#PBF is a versatile and efficient voltage regulator IC and switching regulator IC, suitable for a wide range of applications. It is designed specifically to provide voltage management solutions for post-regulation of automotive power management circuits, as well as common power solutions in less demanding applications such as mobile communications and consumer electronics.

Application Field

The LT3645EMSE#PBF is mainly used for post-regulation of automotive power management circuits, such as automotive power distribution systems, power control circuits, and intelligent battery charging systems. In addition, this IC is also suitable for use in mobile devices and other consumer electronics, as well as LED drive power supplies and other general purpose applications.

The LT3645EMSE#PBF provides pre-regulation solutions, with built-in functions including input voltage protection, output voltage overcurrent protection, output short circuit protection, and output over-voltage protection. This IC also includes a fault signaling pin and a pad for monitoring the switch current.

Working Principle

The LT3645EMSE#PBF is designed to work as either a linear or a switching regulator. Both of these modes use a combination of a sensing resistor and voltage regulator, with the sensing resistor controlling the output voltage.

In linear regulation, the sensing resistor is connected across the output to sense the voltage on the output. The voltage regulator then adjusts the current through the sensing resistor to maintain the output voltage at the desired level. The sensing current is also proportional to the output current, so that the output current is proportional to the input voltage.

In switching regulation, the sensing resistor is connected across the inductor, and the voltage regulator adjusts the current through the inductor to control the output voltage. Depending on the output voltage, the voltage regulator can adjust the duty cycle of the switch to maintain the output voltage. The output current is then regulated by varying the on-time of the switch.

In both linear and switching modes, the LT3645EMSE#PBF is designed to deliver a low-noise, stable voltage output with low power loss. The IC has a wide input range of 6V to 30V, with a maximum output current of 3A. The LT3645EMSE#PBF also features a low EMI design, with an adjustable soft-start circuit and a low-dropout linear regulator. The IC is also designed to be highly efficient, with a typical quiescent current of 330μA.

Conclusion

The LT3645EMSE#PBF is an efficient and versatile regulator IC suitable for a wide range of applications. It is designed to work as either a linear or a switching regulator, and features a wide input range, low power loss, low noise output and high efficiency. This IC is ideal for automotive power management as well as mobile communication and consumer electronics applications.

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