This application note introduces the basic principles of step-down switching regulators and provides a simple step-down switching regulator circuit.
The document discusses the theory behind step-down (buck) switching regulation, noting that while linear regulators can perform this function, they lack the efficiency of switching approaches. It introduces convenient ICs that allow for practical implementation with minimal complexity.
The text details various circuit configurations, including basic step-down circuits using the LT1074 IC, dual output regulators utilizing coupled windings, negative output regulators, and current-boosted designs. It also covers post-regulation techniques to improve transient response.
| Internal Reference Voltage | 2.5V |
|---|
Linear regulators cannot achieve the efficiency of switching based approaches.
They are selected to force the feedback pin to the device's internal 2.5V reference value.