LT3973IDD-3.3#TRPBF

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LT3973IDD-3.3#TRPBF is a DC-DC switching regulator, which is a type of voltage regulator used to convert one DC voltage to another while isolating the output from the input. It offers an excellent combination of low noise, high efficiency and wide input voltage range, making it suitable for applications that require tight regulation, particularly where space and efficiency are limited. The regulator is housed in a small 10-lead package, which allows the designer to fit it into even the most confined spaces.

Design Considerations

When designing a circuit to take advantage of the features offered by the LT3973IDD-3.3#TRPBF, a number of design considerations must be kept in mind. Firstly, the input voltage range must fall within the range specified by the device. The maximum power rating of the device must also be taken into account to ensure that it is able to handle the required current. Also, the operating temperature range must be kept within the limits specified by the device.

Output Voltage and Current Regulation

The LT3973IDD-3.3#TRPBF is capable of providing a regulated output voltage over a wide range, ranging from 0.6V - 36V. The output voltage is adjustable through resistors connected to the FBIN1 and FBIN2 pins. In order to maintain highly accurate voltage regulation, the LT3973IDD-3.3#TRPBF also includes a temperature compensation function. This function uses a combination of the RREF resistor and the internal voltage reference to reduce temperature effects on the output voltage. In addition, the regulator is able to provide output current regulation, limiting the output current to the value specified by the designer. This helps to reduce losses and ensure that the parts operate in their most efficient range.

Ripple Rejection and EMI

The LT3973IDD-3.3#TRPBF also contains a number of features to help reduce the amount of AC ripple present on the output. Firstly, the device has an integrated low-dropout (LDO) low-noise linear regulator that helps to reduce the amount of noise and AC ripple on the output. In addition, the device contains a selectable burst mode operation, allowing the device to enter power-save mode when the load is light, further reducing the amount of ripple on the output. Finally, the device has an integrated EMI filter, allowing the design to meet CISPR 22 requirements.

Application Field

The LT3973IDD-3.3#TRPBF is well-suited for a wide range of applications, including regulated power supplies, battery chargers, hand-held medical, personal entertainment, portable electronics, and other applications requiring tight regulation and low noise. The high efficiency and wide input voltage range makes it ideal for power-sensitive applications, such as wireless charging and low power systems. The small 10-lead package makes it ideal for applications where space is limited.

Working Principle

The LT3973IDD-3.3#TRPBF operates as a buck boost converter, meaning that it is capable of regulating output voltage regardless of whether the input voltage is greater than, less than, or approximately equal to the output voltage. The regulator works by controlling the amount of power that is transferred from the input to the output by switching a series of transistors on and off at regular intervals. A voltage loop, comprised of resistors and capacitors, is used to sense the output voltage and adjust the switching frequency in order to maintain a constant output voltage.

Conclusion

The LT3973IDD-3.3#TRPBF is a high performance DC-DC switching regulator, designed to convert one DC voltage to another while providing excellent low noise, high efficiency and a wide input voltage range. The regulator’s features make it suitable for use in a wide variety of applications, from regulated power supplies to hand-held medical and consumer electronics. The regulator operates as a buck boost converter, controlling the amount of power that is transferred from the input to the output using a feedback loop.

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