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 converters 12 vdc input vddq/2 / 8 a output dec. 03, 2010 bel power inc., a subsid iary of bel fuse inc. ? non-isolated ? under-voltage lockout ? high efficiency ? output enable ? fixed frequency ? ocp/scp ? low cost ? current source/sink capability ? tracking a reference for output voltage ? over voltage protection (hiccup mode) ? high power density description the bel vraf-08xt50 module is a non-isolated, step down dc/dc power converter that operates from a nominal 12 vdc or wide range 5 vdc to 13.8 vdc source. this converter is designed specifically to provide bus termination voltages in applications 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 uses this to program its output voltage to 50% of the reference. the unit is packaged in comp act single-in-line footprint and provides a maximum 8 a output. standard features include remote on/off, input under-voltage lockout, output over voltage protection. part selection output voltage input voltage max. output current max. output power typical efficiency model number 0.9 v 5.0 v - 13.8 v 8 a 7.2 w 69% vraf-08at50 0.9 v 5.0 v - 13.8 v 8 a 7.2 w 69% vraf-08et50 notes : 1. all part numbers above indicate rohs 6. change the second letter "r" to "7" for rohs 5 part numbers. 2. add ?g? suffix at the end of the model numbers listed above to indicate ?tray packaging?. 3. part number vraf-08et50 is better suited for applications where start up is guaranteed at 5v input. absolute maximum ratings parameter min typ max notes input supply voltage -0.5 v - 15 v input signal voltage -0.3 v 5.25 v operating temperature 0 c - 70 c storage temperature -40 c - 85 c note: all specifications are typical at 25 c unless otherwise stated. input specifications parameter min typ max notes operating input voltage vraf-08at50 vraf-08et50 5.0 v 5.0 v 12 v 12 v 13.8 v 13.8 v input current (full load) vraf-08at50 vraf-08et50 - - - - 2.2 a 2.2 a input current (no load) - 25 ma 35 ma reference voltage range (vddq) 1.2 v 1.8 v 1.89 v remote off input current - 7 ma 10 ma v raf-08xt50 rohs com p liant rev.j
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 converters 12 vdc input vddq/2 / 8 a output dec. 03, 2010 bel power inc., a subsid iary of bel fuse inc. input specifications (continued) parameter min typ max notes input reflected ripple current (pk-pk) - 110 ma 180 ma input reflected ripple current (rms) - 25 ma 60 ma with simulated source impedance of 1000 nh, 5 hz to 20 mhz. use a 100 uf/25 v tan cap with esr=0.025 ohm max, at 100 khz@25c. i 2 t inrush current transient - 0.006 a 2 s 0.012 a 2 s turn on voltage threshold 2.6 v - 3.9 v turn off voltage threshold 2.4 v - 3.7 v notes : 1. all specifications are typical at 25 c unless otherwise stated. 2. this power module is not internally fus ed. an input line fuse must always be used. output specifications parameter min typ max notes output voltage set point - vddq/2 - vin=12 v, lout=full load tracking tolerance (vddq/2-vout)/vout -1.5% - 1.5% load regulation - 3 mv 6 mv line regulation - 3 mv 6 mv output current 0 a - 8 a output dc current limit 9.2 a - 14 a output ripple and noise (pk-pk) - 25 mv 50 mv output ripple and noise (rms) - 8 mv 15 mv test conditions: 0-20 mhz bw, with a 22 uf / 6.3 v ceramic capacitor at the output. short circuit surge transient - 1.1 a 2 s 2.2 a 2 s turn on time vraf-08at50 vraf-08et50 - 2.5 ms 5 ms 5 ms 8 ms start up from enable. overshoot at turn on - 0% 3% output capacitance 0 uf - 2200 uf transient response 50% ~ 100% max load - 100 mv 200 mv settling time - 20 us 50 us 100% ~ 50% max load - 100 mv 200 mv settling time v o =0.9 v - 20 us 50 us di/dt=0.3 a/us; vin12 v; and with a 22 uf / 6.3 v ceramic capacitor at the output. note : all specifications are typical at vin =12 v, vddq=1.8 v, io=8 a, ta= 25c unless otherwise stated. general specifications parameter min typ max notes efficiency 68% 69% - vin=12 v, vddq=1.8 v, io=8 a switching frequency 260 khz 300 khz 340 khz mtbf 6,416,286 hours calculated per bell core sr-332 (i o = 80% load; vin=12 v; t a = 25 c) dimensions inches (l w h) millimeters (l w h) 0.65 x 0.41 x 0.40 16.51 x 10.41 x 10.16 weight - 2.5 g - note : all specifications are typical at 25 c unless otherwise stated.
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 converters 12 vdc input vddq/2 / 8 a output dec. 03, 2010 bel power inc., a subsid iary of bel fuse inc. control specifications parameter min typ max notes output enable enable high 2 v - 5.5 v enable low 0 v - 0.8 v enable pin open, the module is off. efficiency data efficiency curve 45.0% 50.0% 55.0% 60.0% 65.0% 70.0% 75.0% 80.0% 85.0% 0.8 2.0 4.0 6.0 8.0 output current (a) efficiency 10.8 v 12.0 v 13.2 v vraf-08at50 efficiency curve 45.0% 55.0% 65.0% 75.0% 85.0% 0.8 2.0 4.0 6.0 8.0 output current (a) efficiency 5.0v 12.0v 13.8v vraf-08et50
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 converters 12 vdc input vddq/2 / 8 a output dec. 03, 2010 bel power inc., a subsid iary of bel fuse inc. thermal derating curve the thermal reference point tref is shown above. for reliable operation this temperature should not exceed 115 c. the output power of the module should not exceed the rated power for the module. vin=12 v, vddq=1.8 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 converters 12 vdc input vddq/2 / 8 a output dec. 03, 2010 bel power inc., a subsid iary of bel fuse inc. ripple and noise waveform note: ripple and noise at vin=12 v, vddq=1.8 v, io=8 a, with a 22 uf/6.3 v x5r ceramic capacitor at the output, ta=25 c. transient response waveforms 50% to 100% load step at vin=12 v, vddq=1.8 v 100% to 50% load step at vin=12 v, vddq=1.8 v note: transient response at di/dt=0.3 a/us, with 22 uf/6.3 v x5r ceramic capacitor at the output, ta=25 c.
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 converters 12 vdc input vddq/2 / 8 a output dec. 03, 2010 bel power inc., a subsid iary of bel fuse inc. output tracking test condition: vin=12 v, vddq=1.8 v, io=8 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 converters 12 vdc input vddq/2 / 8 a output dec. 03, 2010 bel power inc., a subsid iary of bel fuse inc. mechanical outline pin connections pin function 1 vin 2 vddq 3 vout 4 gnd 5 enable
? 2010 bel fuse inc. specifications subject to change without notice. 120310 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 converters 12 vdc input vddq/2 / 8 a output dec. 03, 2010 bel power inc., a subsid iary of bel fuse inc. revision history date revision changes detail approval 2010-02-26 i update the input range for vraf-08at50 and add note 3 for vraf- 08et50 on first page. hl 2010-12-03 j add pin length in the md. xf rohs compliance complies with the european directive 2002/95/ec , calling for the elimin ation of lead and other hazardous substances from electronic products.
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