LP3990TLX-1.5/NOPB LP3990TLX-1.8 LP3990TLX-1.8/NOPB LP3990TLX-2.5 LP3990TLX2.5/NOPB LP3990TLX-2.5/NOPB LP3990TLX-2.8 LP3990TLX-2.8/NOPB LP3991 LP3991-12B3F