STDA017 November 2025 TPS7A33 , TPS7A4501-SP , TPS7A47 , TPS7A47-Q1 , TPS7A4701-EP , TPS7A52 , TPS7A52-Q1 , TPS7A53 , TPS7A53-Q1 , TPS7A53A-Q1 , TPS7A53B , TPS7A54 , TPS7A54-Q1 , TPS7A57 , TPS7A8300 , TPS7A83A , TPS7A84 , TPS7A84A , TPS7A85A , TPS7A90 , TPS7A91 , TPS7A92 , TPS7A94 , TPS7A96 , TPS7B7702-Q1 , TPS7H1111-SEP , TPS7H1111-SP
This document compares and contrasts the noise performance of three common parallel LDO techniques. For the first time, the technical foundation for noise reduction in parallel LDOs using ballast resistors is discussed while demonstrating that other techniques do not provide the same noise advantage. Designers can now architect the correct parallel LDO architectures to meet specific design requirements, including ultra low noise specifications, when no single LDO can meet the noise specification alone.