LT3668IMSE#PBF

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PMIC, short for Power Management Integrated Circuit, is integral to all modern electronic devices. More specifically, voltage regulators are necessary for any electronic device that relies on a single power source for multiple components. The LT3668IMSE#PBF is a 4.5 V to 18 V, 3-A buck-boost switch-mode voltage regulator, designed for ultra-low quiescent current (8 nA) power systems. It provides a low dropout voltage and high efficiency, making it ideal for applications such as solar-powered electronics, low-power systems and hearing aids. This article will discuss the application field and working principle of the LT3668IMSE#PBF.

Application of LT3668IMSE#PBF

The LT3668IMSE#PBF can be used in a variety of applications that require a regulated power supply. It is ideal for low voltage systems, due to its ultra-low quiescent current. It can also be used in high power systems, thanks to its high efficiency and low dropout voltage. The integrated power good flag allows designers to monitor the output voltage and hence ensure accurate system regulation. Additionally, it supports a wide variety of output voltages, from 4.5 V to 18 V, making it suitable for multiple applications.

The LT3668IMSE#PBF is well suited for use in solar-powered electronic systems and is a particularly attractive voltage regulator for low-power applications such as hearing aids, smart cards, and battery-powered devices. Solar-powered electronic systems require efficient, low-dropout voltage regulation, and the LT3668IMSE#PBF meets these requirements. It features an internally-trimmable logic reference voltage, which helps minimize programming component locations that would be typically needed for other solar-powered switching regulators. This allows for a smaller solution size that allows more freedom in designs. Additionally, its low quiescent current allows energy savings in battery powered systems.

Working Principle of LT3668IMSE#PBF

The LT3668IMSE#PBF employs a synchronous fourth-order, continuous conduction mode (CCM) buck-boost architecture. It integrates an input voltage boost regulator, an inductor current mode synchronous buck/boost controller, two N-channel power MOSFETs and a low quiescent current linear regulator. The buck-boost converter operates in three different modes: buck, boost and buck-boost. In the buck mode, power is transferred from the input to the output. The output voltage is lower than the input voltage. The boost mode transfers power from the output to the input. Here, the output voltage is higher than the input voltage. The buck-boost mode DC-DC converter supports bidirectional power transfer and its output voltage is either higher or lower than the input voltage.

The LT3668IMSE#PBF IC uses an internal synchronous buck-boost inverter. It can achieve high efficiency over a wide input voltage range, regardless of whether the output is above or below the input voltage. The controller has two main components, an error amplifier and a current sense amplifier. The error amplifier compares an internally generated logic reference voltage to the output voltage and produces a voltage representing the error between them. This voltage is then used to adjust the duty cycle of the synchronous buck-boost inverter, allowing the demanded output voltage to be obtained, while keeping the inductor current flowing in a desired direction. To further optimize the performance, the current sense amplifier senses the inductor current and feeds back the signal to the error amplifier.

In summary, the LT3668IMSE#PBF is an ideal voltage regulator for a broad range of applications. Its ultra-low quiescent current, low dropout voltage and wide output voltage range make it suitable for a variety of low and high power applications. The integrated synchronous buck-boost inverter allows for high efficiency over a wide input voltage range and its low internal operating power and high efficiency make it an attractive solution for low-power applications such as hearing aids, smart cards and battery-powered devices.

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