bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converter 5 vdc input vref/2 / 5 a output ? non-isolated ? remote on/off ? fixed frequency (300 khz) ? ocp/scp ? under-voltage lockout (uvlo) ? low profile package (7.82 mm) ? current sink capability ? ul60950-1 recognized (ul/cul) description the bel xrah-05bt50 is part of the low cost non-isolated dc/dc converter series. the converter is designed specifically to provide bus termination voltage in applic ation such as ddr (double data rate) memory where the bus termination voltage must closely track the i/o bus voltage. the converter accepts a reference input and programs its output voltage to 50% of the reference. the modules use a smd or vertical mount package for ease of layout and space savings. part selection output voltage input voltage max. output current max. output power typical efficiency part number surface mount part number vertical mount vref/2 5 v 5 a 6.25 w 82% srah-05bt50 vrah-05bt50 notes: 1. add ?0? suffix at the end of the model number to indicate ?tube packaging?, and ?r? for ?reel packaging?, and ?g? for ?tray packaging?. 2. all part numbers above indicate rohs 6. change the second letter "r" to "7" for rohs 5 part numbers. absolute maximum ratings parameter min typ max notes input voltage (continuous) -0.3 v - 6 v output enable terminal voltage -0.3 v - 6 v ambient temperature -40 c - 85 c storage temperature -55 c - 125 c input specifications parameter min typ max notes input voltage 4.5 v 5.0 v 5.5 v input current (source) - - 2 a input current (sink) -1.5 a input current (no load) - - 60 ma remote off input current - 9 ma 15 ma input reflected ripple current (rms) - 30 ma 50 ma input reflected ripple current (pk-pk) - 110 ma 140 ma measured with simulated source impedance of 500 nh, 5 hz to 20 mhz; & one 270 uf/16 v capacitor with esr = 0.018 ohm max. at 100 khz i 2 t inrush current transient - 0.02 a 2 s 0.05 a 2 s vref voltage 0 v 2.5 v 4 v turn-on voltage threshold 4.19 v 4.3 v 4.5 v turn off voltage threshold - 3.8 v 4.49 v notes: 1. all tests are measured at vref = 2.5 v. 2. all specifications are typical at 25 c unless otherwise stated. xrah-05bt50 rohs com p liant rev.a
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converter 5 vdc input vref/2 / 5 a output output specifications parameter min typ max notes output voltage set point 0.99* (vref/2) v vre f/2 1.01* (vref/2) v vin=5 v, iout=full load. load regulation - 3 mv 6 mv line regulation - 1 mv 3 mv regulation over temperature (-40 c to +85 c) - 15 mv 20 mv output current 0 a - 5 a output current threshold 6.5 a - 12.5 a short circuit surge transient - 0.04 a 2 s 0.08 a 2 s ripple and noise (rms) - 12 mv 20 mv ripple and noise (pk-pk) - 45 mv 90 mv tested at: 0-20 mhz bw; with 1 uf ceramic capacitor at the output turn on time - 12 ms 20 ms overshoot at turn on - 0% 3% output capacitance - - 2200 uf notes: 1. all specifications are typical at nominal input, full load at 25 c unless otherwise stated. 2. the modules track the transient response of the reference input. see the figure in tr data on page 4. 3. the turn-off undershoot of the module is below 100 mv if a 220 uf aluminum cap is added at the output. 4. all tests are measured at vref=2.5 v. general specifications parameter min typ max notes efficiency (source) 79% 82% - measured at vin=5v, lo=lo-max full load efficiency (sink) 78% 81% - measured at vin=5v, lo=lo-max full load switching frequency 250 khz 300 khz 340 khz mtbf 8,841,119 hours calculated per bell core sr-332 (i o = 4 a, vin=5 v, vref=2.5 v; t a = 25 c) dimensions (surface mount) inches (l w h) millimeters ( l w h ) 0.78 x 0.7 x 0.32 19.812 x 17.78 x 8.128 dimensions (vertical) inches (l w h) millimeters ( l w h ) 0.7 x 0.308 x 0.65 17.78 x 7.82 x 16.51 weight - 4.7 g - note : all specifications are typical at nominal input, full load at 25 c unless otherwise stated. all tests are measured at vref=2.5 v. control specifications parameter min typ max notes remote on/off -0.3 v - 1.35v (vin=4.5v) signal low (unit off) -0.3 v - 1.65v (vin=5.5v) 3.15 v(vin=4.5v) - 5.5 v signal high (unit on) 3.85 v(vin=5.5v) - 5.5 v remote on/off pin open, unit on note: all tests are measured at vref=2.5 v.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converter 5 vdc input vref/2 / 5 a output efficiency data efficiency curve 79.0% 80.0% 81.0% 82.0% 83.0% 84.0% 85.0% 86.0% 87.0% 1.0 2.0 3.0 4.0 5.0 output current (a) efficiency 4.5 v 5.0 v 5.5 v efficiency is tested at vref=2.5 v thermal derating curves vrah-05bt50 srah-05bt50 test condition : derating curves are tested at nominal input voltage and vref=2.5v.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com non-isolated dc/dc converter 5 vdc input vref/2 / 5 a output ripple and noise waveform 5 vdc input, 1.25 vdc output note: ripple and noise at max load, with 1uf ceramic cap at the output, ta=25 deg c. transient response waveforms note: track the transient response of the referenc e input. no external load capacitance. channel 1: transient response tracking. channel 2: transient response of the reference input.
? 2007 bel fuse inc. specifications subject to change without notice. 010807 corporate far east europe bel fuse inc. bel fuse ltd. bel fuse europe ltd. 206 van vorst street 8f/ 8 luk hop street preston technology management centre jersey city, nj 07302 san po kong marsh lane, suite g7, preston tel 201-432-0463 kowloon, hong kong lancashire, pr1 8ud, u.k. fax 201-432-9542 tel 852-2328-5515 tel 44-1772-556601 www.belfuse.com fax 852-2352-3706 fax 44-1772-888366 www.belfuse.com www.belfuse.com non-isolated dc/dc converter 5 vdc input vref/2 / 5 a output mechanical outline srah-05bt50 vrah-05bt50 rohs compliance complies with the european directive 2002/95/ec , calling for the elimin ation of lead and other hazardous substances from electronic products. these parts are not however compatible with the higher temperatures associated with lead free solder processes and must be soldered using a reflow profile with a peak temperature of no more than 240 oc. bel bel bel pin connections pin function 1 remote on/off (option) 2 vin 3 ground 4 vout 5 vref (option) 6 n/a 7 n/a pin connections pin function 1 remote on/off (option) 2 vin 3 ground 4 vout 5 vref (option)
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