LT8302IS8E#PBF

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PMIC - Voltage Regulators - DC DC Switching Regulators

The LT8302IS8E#PBF is a highly efficient, current-mode, buck-boost switching regulator, ideal for applications where a wide input voltage range exists. It has three operating modes, buck, boost and buck-boost, which can be easily configured through two pins (SS/TR). This integrated device includes a buck converter, a boost converter, a switching logic circuit and two free-wheeling diodes integrated in a single package, operated over the input voltage range of 2.75V to 32V, and a wide output range of 2.25V to 32V.

Features

The LT8302IS8E#PBF comes with a variety of features and benefits. It has an adjustable frequency of 400kHz to 2.2MHz, enabling designers to optimize efficiency and as a single-inductor, multi-mode regulator, it provides superior efficiency over a wide range of output voltages. The preset 2.2MHz switching frequency offers the smallest inductor size while still ensuring noise-free performance. The switching regulator features a 1.3mA operating current, which is suitable for powering applications with low standby current requirements and it also offers over-temperature protection (OTP) and under voltage lockout (UVLO) for reliable operation.

Application Field

The LT8302IS8E#PBF is suitable for a wide range of applications that require a wide input voltage range, including mixed-signal circuit, automotive, consumer electronics, industrial systems and instrumentation. Its high efficiency and low operating current make it ideal for battery powered applications, as well as for applications where power and space are of premium value.

Working Principle

The working principle of the LT8302IS8E#PBF can be easily understood if it is broken down into three simpler concepts. Firstly, it acts as a buck circuit when the voltage at the SS/TR pin is low. This means that the input voltage is stepped down and the output voltage is at a lower level to the input voltage. Secondly, it acts as a boost circuit when the voltage at the SS/TR pin is high. Here, the input voltage is stepped up so that the output voltage is higher than the input voltage. Lastly, it acts as a buck-boost circuit when the voltage at the SS/TR pin is intermediate between the low and high levels. This is the most commonly used configuration for the LT8302IS8E#PBF and is when the device switches between buck and boost mode depending on the voltage at the output.

In buck mode, the device acts as a current-mode switching regulator, where a frequency-compensatable current-sense amplifier with positive gain is used to generate the average inductor current. This average inductor current is fed back to the input voltage using a voltage-mode error amplifier to modulate that current, which regulates the output voltage. The boost operation is similar to the buck operation, except that the switch controls the inductor current, rather than the output voltage.

In the buck-boost operation, the device switches between buck and boost mode depending on the output voltage level. This is achieved by controlling the voltage at the SS/TR pin, which is done by the internal error amplifier. This error amplifier senses the output voltage and sets the SS/TR pin accordingly, in order to select the optimal mode for maintaining the output voltage. This makes the overall operation more efficient as the device does not spend unnecessary energy switching between the two modes.

In conclusion, the LT8302IS8E#PBF is an ideal solution for applications which require a wide input voltage range, high efficiency and low standby current. Its versatile design, integrating buck, boost and buck-boost mode in a single device, allows designers to optimize the design for their application requirements.

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