18v/500ma output step-down dc/dc converter(non-isolated) BP5226-18 absolute maximum ratings input voltage operating temperature range storage temperature range maximum surface temperature maximum output current parameter symbol limits unit vi to p r ts t g tcmax iomax v c c c mapk unit conditions dc vi=34v, io=500ma vi=34v vi=20 to 46v, io=500ma vi=34v, io=0 to 500ma vi=34v, io=500ma sw1 off (vooff) sw1 on (voon) vi=34v, io=500ma electrical characteristics input voltage range output voltage output current line regulation load regulation output ripple voltage ctl pin off voltage ctl pin on voltage ctl terminal pull-up resistance power conversion efficiency parameter symbol typ. max. min. conversion efficiency (ta=25 c , vi=34v) 100 80 60 40 20 0 0 100 300 400 500 200 output current io(ma) conversion efficiency dimensions (unit : mm ) derating curve derating curve operation range 600 500 400 300 200 100 0 010 -30 -20 -10 20 40 30 80 70 60 50 90 output current io(ma) load regulation 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 2.0 0 0 100 300 400 500 600 700 800 200 (ta=25 c , vi=12v) output current io(ma) load regulation application circuit external component specifications fuse: fuse use a quick-acting fuse (1.8a) c1: input capacitor c2: output capacitor l1: power inductor above 60v, current:above 1.0a d1: diode pin no. 1 2 3 4 5 6 7 8 9 10 11 12 please verify operation and characteristics in the customer's circuit before actual usage. ensure that the load current does not exceed the maximum rating. input terminal is 10 and 12. ambient temperature ta( c ) output voltage vo(v) output terminal:vo(18v) ctl terminal power inductor terminal skip power inductor terminal skip common skip skip input terminal n.c. input terminal function BP5226-18 be sure to use fuse for safety. 1 2 3 5 7 10 11 12 c2 c1 d1 ctl l1 fuse ac24v io vo conditions dc refer to derating curve (ambient temperature + the module self-heating) tcmax 1/1 2010.03 - rev. b www.rohm.com ? 2010 rohm co., ltd. all rights reserved. data sheet
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