Dual Ideal Diode Selection

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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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    Aluminum Electrolytic Capacitors - Leaded EEUFR1V471L CAP-TH_BD8.0-P3.50-D0.6-FD LCSC Part Number: C178716 JLCPCB Part Class: Extended Part Manufactured by PANASONIC(松下)

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    lcsc.com/datasheet/lcsc_datasheet_2409280200_PANASONIC-EEUFR1V471L_C178716.pdf

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    CAP-TH_BD8.0-P3.50-D0.6-FD

    Aluminum Electrolytic Capacitors - Leaded

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