Inductor Selection for Buck-Boost Regulator
Thought for 2 mins 26 sec
For a 5 A-capable buck-boost inductor, these are solid options from the library based on datasheet values:
Inductor options
Table
| Part | Inductance | Irms / Rated Current | Isat | DCR | Package | Notes |
|---|---|---|---|---|---|---|
| FXL0420-1R0-M | 1.0 µH | 5.4 A max, 6 A typ | 5.6 A max, 7 A typ | 27 mΩ max | 4.4 x 4.2 x 1.8 mm | Smallest option, but not much margin above 5 A |
| APS0630M1R0A | 1.0 µH | family includes much higher-current parts | family includes much higher-current parts | package family includes low-DCR options | 6.6 x 7.7 x 3.0 mm class | Promising family, but exact row for this specific variant should be double-checked before finalizing |
| SLW8040S1R0MST | 1.0 µH ±20% | 6.30 A | 9.85 A | 8 mΩ typ | 8.0 x 8.0 x 4.2 mm | Best margin here; safest pick of these three |
If you want the safest choice from these results, use SLW8040S1R0MST.
Why:
- Irms = 6.3 A gives real thermal margin over your 5 A requirement
- Isat = 9.85 A gives better peak current headroom
- DCR = 8 mΩ is much better than the smaller option, so it will run cooler
A 5 A current rating alone is not enough to finalize the inductor. The correct inductance value depends on:
- input voltage range
- output voltage
- switching frequency
- allowed ripple current
If you give me:
- Vin min / max
- Vout
- switching frequency
- whether the 5 A is output current or inductor peak/current target
I can narrow this to the right inductance value and pick the best exact part.
Thought for 1 min 11 sec
A good match is CSBX1670-220M.
Recommended inductor
Table
| Part | Inductance | Current | DCR | Type | Why it fits |
|---|---|---|---|---|---|
| CSBX1670-220M | 22 µH | 8.5 A | 23.5 mΩ max | Shielded wirewound SMD | Lands in your 15 to 30 µH target and stays comfortably above your 6.3 A limit |
This is the cleanest fit I found for your updated requirement:
- inductance in range: 22 µH
- current capability above your ceiling: 8.5 A
- shielded power inductor
- reasonable DCR for this value/current class
If you want, I can next narrow it further by:
- smallest footprint
- lowest DCR
- best availability/cost
Or I can help choose whether 15 µH, 22 µH, or 30 µH is best for your exact buck-boost operating point.
Compare 15/22/30uH
Lowest DCR option
Smallest footprint
Best cost availability
