LT3469ETS8#TRMPBF

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Linear - Amplifiers - Special Purpose

The LT3469ETS8#TRMPBF is a high-performance, switching-mode step-up DC/DC converter designed to efficiently provide up to 5A of output current from low input voltages as low as 1.5V. Its efficient, floating-inductor, switch-mode architecture and fixed maximum frequency of 1MHz allow the chip to achieve near-zero radiated EMI and minimal size. These features make it suitable for a variety of applications and product designs.

The LT3469ETS8#TRMPBF is a step-up DC/DC converter that supports both buck and boost switching modes. The switching mode is selectable via two external resistors, allowing the user to set the output voltage from a lower than the input voltage (buck mode) or an output voltage higher than the input voltage (boost mode). There are an additional two external resistors that are used to set the frequency of the converter, which can be as high as 1MHz to minimize EMI and reduce board area.

The high-efficiency design of the LT3469ETS8#TRMPBF is a key feature for a number of applications. When operating in buck mode, it can achieve efficiencies of up to 95%, while in boost mode it can achieve up to 90%. These high efficiencies reduce heat dissipation, helping reduce cost and optimize the overall end product. The device also features fast transient response times, typically settling to within 1% of steady-state under load step changes.

The LT3469ETS8#TRMPBF is most commonly used in applications requiring low noise, low EMI, and high efficiency such as LED lighting and display applications, computer motherboards, cellular handsets, industrial and consumer electronics, and small form factor portable equipment.

Working Principle

The LT3469ETS8#TRMPBF is based on a traditional buck converter and boost converter topology. The basic structure of the chip consists of a high- and low-side switch, an output stage, and a controller. The switches are driven by the control logic which is designed to maintain the regulated dc input voltage. When the device is in buck mode, the high side switch is switched on and off in order to draw charge from the input voltage and transfer it to the output stage. The low side switch is turned on and draws current from the output stage as the input voltage decreases. In boost mode, the low side switch is switched on and off in order to draw power from the input voltage and transfer it to the output stage, while the high side switch is turned on and draws current from the output stage as the input voltage increases. This switching process is maintained in a continuous loop through the feedback from the error amplifier and internal compensation loop to keep the output voltage regulated.

Conclusion

The LT3469ETS8#TRMPBF is a highly efficient, switching-mode step-up DC/DC converter designed to provide up to 5A of output current from low input voltages with minimal size and near-zero radiated EMI. This device is suitable for a variety of applications such as LED lighting, display applications, computer motherboards, cellular handsets, industrial and consumer electronics, and small form factor portable equipment. The LT3469ETS8#TRMPBF is based on a buck and boost converter topology with an error amplifier and internal compensation loop to maintain the regulated output voltage.

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