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
| Part | Inductance | Irms / Rated Current | Isat | DCR | Package | Notes |
|---|---:|---:|---:|---:|---|---|
| [FXL0420-1R0-M](https://www.flux.ai/search?type=components&q=3aaaca8d-c00b-425e-9f5a-8f85eff8ceb2) | **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](https://www.flux.ai/search?type=components&q=ea285a14-9191-401a-b545-02046d0e48d0) | **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](https://www.flux.ai/search?type=components&q=d9af8564-9f49-41e5-80f3-0cea91ba0171) | **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 |
### My recommendation
If you want the safest choice from these results, use [SLW8040S1R0MST](https://www.flux.ai/search?type=components&q=d9af8564-9f49-41e5-80f3-0cea91ba0171).
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
### Important note
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
