The LT3580 is a 2A, 42V integrated switch DC/DC converter that can be used in multiple topologies such as boost, SEPIC, flyback, and Cuk. It can use a single resistor to set either positive or negative output, making it easy for designers to use a single component list. The LT3580 also has soft-start, adjustable frequency, synchronization, and a wide input range, all in a small package.
This document is Design Note 435 from Linear Technology, focusing on the LT3580 DC/DC converter. It highlights how this device solves inventory issues by controlling both positive and negative outputs using the same feedback configuration. The note details the novel FB pin architecture that simplifies sensing for various topologies.
| Integrated switch current | 2A |
|---|---|
| Switch voltage rating | 42V |
| Package types | 8-pin 3mm x 3mm DFN or MSOP |
| Switching frequency range | 200kHz to 2.5MHz |
It uses a novel FB pin architecture with two internal error amplifiers, allowing one feedback resistor for both positive and negative outputs.
The device can be configured for boost, SEPIC, flyback, and Cuk topologies.