Automotive 12V batteries typically operate in the range of 9V-16V. However this voltage can vary widely due to transient conditions such as cold crank and load dump. This reference design creates a well-regulated 25W (5V,5A) output, regardless of large input voltage transients, utilizing the LM5150-Q1 and LM5141-Q1. The LM5150-Q1 is implemented as a pre-boost, only switching when the input voltage is below 6.8V, and utilizes the inductor as a differential EMI filter when not switching. The LM5141-Q1 operates as a buck controller regulating the 5V output. Both devices switch at 2.2 MHz.
| Output voltage options | PMP15041.1 |
|---|---|
| Vin (Min) (V) | 2.8 |
| Vin (Max) (V) | 40 |
| Vout (Nom) (V) | 5 |
| Iout (Max) (A) | 5 |
| Output Power (W) | 25 |
| Isolated/Non-Isolated | Non-Isolated |
| Input Type | DC |
| Topology | Boost- Non Sync^Buck- Synchronous |
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| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | 25-W, Automotive, Start-Stop Reference Design Operating at 2.2 MHz | Mar. 01, 2018 |
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