View max641s datasheet:

SCOPE: FIXED OUTPUT, 10W CMOS, STEP-UP SWITCHING REGULATOR Device Type Generic Number 01 MAX641AM(x)/883B Case Outline(s). The case outlines shall be designated in Mil-Std-1835 and as follows: Outline Letter Mil-Std-1835 Case Outline Package Code MAXIM SMD JA P GDIP1-T8 or CDIP2-T8 8 LEAD CERDIP J8 Absolute Maximum Ratings Supply Voltage, VOUT ....................................................................................................... +18V Output Voltage, LX and LBO ........................................................................................... +18V Input Voltage, LBI, LBO, VFB and COMP......................................... -0.3V to (+VOUT+0.3V) LX Output Current .......................................................................................