SLYY203B September 2021 – April 2023 BQ25125 , LM5123-Q1 , LMR43610 , LMR43610-Q1 , LMR43620 , LMR43620-Q1 , TPS22916 , TPS3840 , TPS62840 , TPS63900 , TPS7A02
Optimizing IQ requires the resolution of multiple, conflicting design challenges. You must meet all of the critical performance specifications in transient response, noise and accuracy, while reducing IQ by orders of magnitude. Before assessing the trade-offs in performance specifications, you must quantify the IQ and power losses over the entire output load range. For DC/DC switching converters, look at the power efficiency over load current, while for LDOs, look at current efficiency over load current.
As an example, Figure 10 shows the efficiency of TI’s TPS63900https://www.ti.com/product/TPS63900buck-boost converter versus competition. The efficiency for TPS63900 stays above 80% over six decades of load current, starting at 1 µA and hitting a peak efficiency of 96%.