LM2990S-1.5 LM2990S-12 LM2990S-12 P+ LM2990S-12(04+) LM2990S-12/NOPB LM2990S-13+ LM2990S-15 LM2990S-15 其他IC LM2990S-15/NOPB LM2990S15NOPB