Abstract

The LM5123 device is a wide input range, synchronous boost controller with envelope tracking capability. The device also integrates several features to meet system design requirements including precision enable, programmable UVLO, programmable soft-start, programmable switching frequency and adjustable control loop compensation. This application note details how to design a boost controller with a dynamically programmable output voltage. The results of this design are measured on the LM5123EVM-BST evaluation module and the results are presented in LM5123EVM-BST User's Guide. The basic concept and operation of a boost converter can be found in Understanding Boost Power Stages in Switchmode Power Supplies.