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Here are the closest matches I found for “buck-boost, 3.3 V, 500 mA, quiescent <1 µA.” Note: the candidates below are 3.3 V/500 mA buck‑boost parts, but sub‑1 µA quiescent current at this load class is uncommon; these typically have higher Iq.

Table

PartMPNPackageLibrary LinkDatasheet
Buck Boost 3.3V 500mA ModuleTPS63051-based moduleModuleBuck Boost 3.3V 500mA ModuleDatasheet
TPS63051YFFTTPS63051YFFT12-DSBGATPS63051YFFTDatasheet
TPS63051YFFRTPS63051YFFR12-DSBGATPS63051YFFRDatasheet
Notes and next steps
  • Ultra‑low Iq (<1 µA) and 500 mA output are a tough combo. Library matches at 500 mA tend to have higher Iq. If <1 µA is a hard requirement, we can either:
    • Reduce the max continuous load target to surface true nanopower buck‑boost options (e.g., search families like TPS63900).
    • Keep 500 mA but relax Iq (e.g., <10–20 µA), which opens many viable 3.3 V buck‑boost choices.
    • Use system power‑gating so the converter sleeps off most of the time, meeting average Iq goals.
  • Preference? I can rerun the search with adjusted constraints or shortlist one of the above to verify Iq from the datasheet.
Relax Iq requirement
Lower max load
Check Iq in datasheet
Search TPS63900 parts
Power-gating in schematic
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