Cheap And Discounts 1Pcs LT3991EMSE 55V, 1.2A step-down regulator with 2.8μA quiescent current MSOP-10-EP LT3991EMSE#TRPBF Wholesale. Buy Directly From Merchant Shop1103769184 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.