View max631 datasheet:

SCOPE: FIXED/ADJUSTABLE, LOW POWER CMOS, STEP-UP SWITCHING REGULATOR Device Type Generic Number 01 MAX631AM(x)/883B 02 MAX631BM(x)/883B 03 MAX632AM(x)/883B 04 MAX632BM(x)/883B 05 MAX633AM(x)/883B 06 MAX633BM(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, VFB ...............................................................