Dual Ideal Diode Selection
Thought for 1 min 16 sec
For dual-input ideal diode OR-ing at 12 V, pick one of these library parts (ordered by robustness and simplicity):
- LTC4359HDCB#TRPBF – Ideal diode controller for N‑MOSFETs, 4–80 V. Very low loss with external FETs; great for 12 V rails.
- LM5050-1 – TI ideal diode controller for N‑MOSFET OR-ing, 5–75 V, proven for 12 V.
- TPS2121RUXR – 2‑input power mux (2.8–22 V) with ideal‑diode behavior, prioritization and current limiting; simplest integration.
- LTC4412ES6#TRMPBF – P‑MOSFET ideal diode controller (2.5–28 V); simpler but higher RDS(on) with P‑FETs.
External MOSFET suggestions to pair with controllers:
- N‑FET: CSD17575Q3T – 30 V, very low RDS(on) for low loss.
- P‑FET (if using LTC4412): AO3401A – 30 V, SOT‑23 P‑channel.
Recommendations:
- Need minimal design effort and built‑in current limit/prioritization: use TPS2121RUXR.
- Need highest current/lowest drop: use LTC4359HDCB#TRPBF or LM5050-1 with suitable N‑FET(s).
Quick checks before choosing:
- What is your max continuous/peak load current?
- Do you need source priority or current limiting?
- Any surge/inrush constraints into big downstream caps?
Tell me these and I’ll pick the exact controller variant and FET sizing.
choose TPS2121RUXR
select N-FET
specify load current
inrush limiting
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