A coextruded, retortable film includes a core layer having an ethylenevinyl alcohol copolymer; two intermediate layers including a polyamide; two adhesive layers including a polymeric adhesive; and two outer layers including low density polyethylene, medium density polyethylene, high density polyethylene, ethylenealpha olefin copolymer, propylene homopolymer, andor propylenealpha olefin copolymer. A switch may be placed in series between the charge pump and the PMIC to disconnect the charge pump and prevent kickback current from reaching the PMIC. The keyboard includes a platform supporting the plurality of keys.