Figure 1 shows an 8- to 40-V input, 5-V output at 4-A maximum load current, dc-dc converter. It uses two LT3430 60-V monolithic, 3-A (peak switch current) buck regulators in parallel. The ICs are ...

Part 2 discusses electrical design considerations for a purpose-built load device, including passive and active component selection, board layout, and techniques for precision current measurement.