bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 1 non-isolated dc/dc converters 12 vdc input vddq/2 / 8 a output nov. 10, 2010 bel power inc., a subsidiary of bel fuse inc. features ? non-isolated ? under-voltage lockout ? high efficiency ? output enable ? fixed frequency ? ocp/scp ? current source/sink capability ? low cost ? tracking a reference for output voltage ? high power density ? over voltage protection (hiccup mode) ? class 1, category 2, non-isolated dc/dc converter (refer to ipc-9592) applications ? networking ? computers and peripherals ? telecommunications description the bel VRAF-08AT5E 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 compact si ngle-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 vdc 5.0 vdc - 13.8 vdc 8 a 7.2 w 69% VRAF-08AT5E notes: add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation v r af ? 08 a t5 e 1 2 3 4 5 6 7 1---vertical mount 2---rohs 6, change ?r? to ?7? means rohs 5 3---series name (sip) 4---series code (output current 8a) 5---input range (5.0-13.8v) 6---output voltage (vddq/2) 7---suffix v raf-08at5e 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 2 non-isolated dc/dc converters 12 vdc input vddq/2 / 8 a output nov. 10, 2010 bel power inc., a subsidiary of bel fuse inc. absolute maximum ratings parameter min typ max unit notes input supply voltage -0.5 - 15 v input signal voltage -0.3 - 5.25 v operating temperature 0 - 70 c storage temperature -40 - 85 c note: all specifications are typical at 25 c unless otherwise stated. input specifications parameter min typ max unit notes operating input voltage 5.0 12 13.8 v input current (full load) - - 2.2 a input current (no load) - 25 35 ma reference voltage range (vddq) 1.2 1.8 2.0 v remote off input current - 7 10 ma input reflected ripple current (pk-pk) - 110 180 ma input reflected ripple current (rms) - 25 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 0.012 a 2 s turn-on voltage threshold 2.6 - 3.9 v turn-off voltage threshold 2.4 - 3.7 v notes : 1. all specifications are typical at 25 c unless otherwise stated. 2. this power module is not internally fused. an input line fuse must always be used. output specifications parameter min typ max unit notes output voltage set point - vddq/2 - v vin=12 v, lout=full load tracking tolerance (vddq/2-vout)/vout -1.5 - 1.5 % load regulation - 3 6 mv line regulation - 3 6 mv output current 0 - 8 a output dc current limit 9.2 - 14 a output ripple and noise (pk-pk) - 25 50 mv output ripple and noise (rms) - 8 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 2.2 a 2 s turn on time - 2.5 5 ms start up from enable.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 3 non-isolated dc/dc converters 12 vdc input vddq/2 / 8 a output nov. 10, 2010 bel power inc., a subsidiary of bel fuse inc. output specifications (continued) parameter min typ max unit notes overshoot at turn on - 0 3 % output capacitance 0 - 2200 uf transient response overshoot - 100 200 mv v50%~100% of max load settling time - 20 50 us overshoot - 100 200 mv v100%~50% of max load settling time - 20 50 us di/dt=0.3 a/us; v o =0.9 v; 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 unit notes efficiency 68 69 - % vin=12 v, vddq=1.8 v, io=8 a switching frequency 260 300 340 khz weight - 2.5 - g 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 - note : all specifications are typical at 25 c unless otherwise stated. control specifications parameter min typ max unit notes output enable enable high 2 - 5.5 v enable low 0 - 0.8 v enable pin open, the module is off.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 4 non-isolated dc/dc converters 12 vdc input vddq/2 / 8 a output nov. 10, 2010 bel power inc., a subsidiary of bel fuse inc. 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 thermal derating curves
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 5 non-isolated dc/dc converters 12 vdc input vddq/2 / 8 a output nov. 10, 2010 bel power inc., a subsidiary of bel fuse inc. thermal derating curve (continued) 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 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.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 6 non-isolated dc/dc converters 12 vdc input vddq/2 / 8 a output nov. 10, 2010 bel power inc., a subsidiary of bel fuse inc. 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. 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 7 non-isolated dc/dc converters 12 vdc input vddq/2 / 8 a output nov. 10, 2010 bel power inc., a subsidiary of bel fuse inc. mechanical outline note: this module is recommended and compatible with pb-free wave soldering and must be soldered using a peak solder temperature of no more than 26 0 oc for less than 5 seconds. note: 1) all pins: material - copper alloy; finish ? 3 micro inches minimum gold over 50 micro inches minimum nickel plate. 2) undimensioned components are shown for visual reference only. 3) all dimensions in inches (mm); tolerances: x.xx +/-0.0 2 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm). pin connections pin function 1 vin 2 vddq 3 vout (vtt) 4 gnd 5 enable
? 2010 bel fuse inc. specifications subject to change without notice. 111010 8 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 nov. 10, 2010 bel power inc., a subsid iary of bel fuse inc. revision history date revision changes detail approval 2010-11-10 a first release hl lu 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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