LTC3851IGN#PBF

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The LTC3851IGN#PBF is a member of the family of DC DC switching controllers and voltage regulators from Linear Technology. This part is capable of delivering a high degree of precision over and above many other types of regulator. It is ideal for applications such as battery fuel gauging, power conversion and control circuits, as well as motor control.

The LTC3851IGN#PBF features Linear Technology’s proprietary Simple Drive feature, which allows the user to program the output voltage up to 0.5% accuracy with only one resistor, while maintaining precise regulation over line, load and temperature. In addition, the part has a wide input range of 4.5V to 17V and adjustable frequency of up to 2 MHz, allowing it to be used in high-density power designs.

The LTC3851IGN#PBF is a synchronous switching buck-boost DC DC controller that offers easy-to-use, high-accuracy voltage regulation and switching frequency control in a small 3mm x 3mm package. Its synchronous operation improves efficiency and allows for minimal input and output capacitance. Its adjustable switching frequency also allows for applications requiring tighter loop control and for frequency planning to minimize EMI. It can be used in applications where the input-to-output voltage difference is greater than 4V, such as those requiring a buck-boost converter.

The LTC3851IGN#PBF working principle is simple and effective. It consists of an error amplifier, an internal high-side and low-side power MOSFET, and a small reference voltage if higher accuracy is required. To set the output voltage, a single external resistor is needed to set the voltage divider ratio. The error amplifier compares the output voltage to the reference voltage, and the controller adjusts the frequency of the switching signal to give the desired output. The switching frequency is adjustable, allowing for frequency planning and circuitry optimization. The internal power MOSFETs provide excellent upper and lower frequency response, while the light-load efficiency is improved by the part’s patented Burst Mode operation feature.

Due to its high current monitoring accuracy, high-performance synchronous buck-boost operation, and a wide input range, the LTC3851IGN#PBF is an ideal DC DC switching controller for battery fuel gauging and high-current applications. Its compact 3mm x 3mm package, adjustable frequency, and wide input range also make it suitable for power conversion and control circuits, as well as motor control.

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