| ??? 04/15/07 05:00 Modified: 04/15/07 05:14 Read: times Msg Score: +2 +1 Informative +1 Good Answer/Helpful |
#137279 - It\\\'s because of chip design Responding to: ???'s previous message |
I just don't see my company screening caps to ensure that their ESR rating is sufficient. It's because the chip (LP2992) is designed to fit to popular Tantalum capacitors on the market. The stable range of ESR is tuned to fit to the ESR of Ta capacitor of specified capacitance. Otherwise, users have to order a custom capacitor just for the chip. And then, no one buy the chip. When a ceramic capacitor is applied to the LDO, add a (real) series resistor of specified range to the capacitor. Tsuneo |
| Topic | Author | Date |
| Ceramic instead of Tantalum? ESR? | 01/01/70 00:00 | |
| a nice paper related to the topic | 01/01/70 00:00 | |
| Ceramic it is, but.. | 01/01/70 00:00 | |
| LDO regs and ESR | 01/01/70 00:00 | |
| naah, just know-how | 01/01/70 00:00 | |
| Odd | 01/01/70 00:00 | |
| It\\\'s because of chip design | 01/01/70 00:00 | |
| Good Idea! But... | 01/01/70 00:00 | |
| It's not my original idea | 01/01/70 00:00 | |
| Y5V preferred | 01/01/70 00:00 | |
| Still out of stable region at low frequency | 01/01/70 00:00 | |
Only the ESR minimum of cap is what counts | 01/01/70 00:00 |