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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Is it okay to power digital ICs directly from a Li-ion battery, or do I need regulation? | 8 Relevance | 7 months ago | Harper | Theoretical questions | |
| A single Li-ion cell can Swing from about 4.2 V when full to 3.0 V when empty, which is fine for parts designed for that range but dangerous for strict 3.3 V ICs — 4.2 V can exceed their absolute max rating and kill them. If you’ve got mixed 3.3 V and 5 V logic, use the right regulator (buck or LDO for 3.3 V, boost for 5 V) and add proper decoupling and level shifting. It keeps your chips safe, your logic stable, and avoids turning your portable project into a post-mortem project. | |||||
