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 sep . 29 , 20 1 1 bel power inc. , a subsidiary of bel fuse inc. ? non - isolated ? under - voltage lockout ? high efficiency ? output enable ? fixed frequency ? ocp/scp ? low cost ? current source/ sink c apability ? tracking a r eference for o utput v oltage ? over v oltage p rotection ( h iccup m ode) ? high power density description the bel vraf - 0 8 a t5 1 module is a non - isolated, step down dc / dc power converter that operate s fr om a nominal 12 v dc or wide range 10.8 vdc to 13. 2 vdc source . th is 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 bu s 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 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 10.8 v - 13. 2 v 8 a 7.2 w 69 % vraf - 08at5 1 note s : 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 number s listed above to indicate ? tray packaging ? . part number explanation v r af ? 08 a t 5 1 1 2 3 4 5 6 7 1 --- vertical mount 2 --- rohs 6, change ? r ? to ? 7 ? means rohs 5 3 --- 0.65"x0.41" ddr 4 --- output current 8a 5 --- 12v narrow range, 10 .8 - 1 3. 2 v 6 --- vout =0.5v ddq 7 --- option vra f - 08 a t5 1 rohs compliant rev. d
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 sep . 29 , 20 1 1 bel power inc. , a subsidiary of bel fuse inc. absolute maximum ratings parameter min typ max notes input supply vol tage - 0. 5 v - 15 v input signal voltage - 0. 3 v 5.25 v operating temperature 0 ? c - 70 ? c storage temperature - 40 ? c - 8 5 ? c note: all specifications are typical at 25 ? c unless otherwise stated. input specifications parameter min typ max notes operating input voltage 10.8 v 12 v 13. 2 v input current (full load) - - 1.05 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 input specifications (continued) paramet er min typ max notes input reflected ripple current (pk - pk) - 11 0 ma 18 0 ma input reflected ripple current ( rms ) - 25 ma 6 0 ma with simulated source im pedance of 1000 nh, 5 hz to 20 mhz . use a 100 uf/25 v tan cap with esr=0.025 ohm max, at 100 k hz@25c. i 2 t inrush current transient - 0.0 06 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 note s : 1. all specifications are typical at 25 ? c unless otherwise stated. 2. this power module is not internally f used. 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 regula tion - 3 mv 6 mv output current 0 a - 8 a output dc current limit 9.2 a - 1 4 a output ripple and noise (pk - pk) - 25 mv 50 mv output ripple and noise ( r ms ) - 8 mv 15 mv test conditions: 0 - 20 mhz bw, with 13 x 10uf 0603 ceramics + 1 x 47uf 1206 ceramic at the output. short circuit surge transient - 1.1 a 2 s 2.2 a 2 s turn on time - 2.5 ms 5 ms start up from enable. overshoot at turn on - 0% 3% output capacitance 0 uf - 22 00 uf
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 sep . 29 , 20 1 1 bel power inc. , a subsidiary of bel fuse inc. transient response 12.5 % ~ 62.5 %max load - 80 mv 120 mv settling time - 30 us 50 us 62.5 % ~ 12.5 %max load - 80 mv 120 mv settling time v o = 0.9 v - 30 us 50 us di /dt= 1 a/us; vin 12 v; and with 13 x 10uf 0603 ceramics + 1 x 47uf 1206 ceramic at the output. vddq=1.5v. 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 6 8 % 69 % - vin=12 v, vddq=1.8 v, io= 8 a switching frequency 26 0 k hz 30 0 k hz 34 0 k hz mtbf 6,416,286 hours calculated per bell core s r - 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 1 0.41 x 10.16 weight - 2.5 g - note : all specifications are typical at 25 ? c unless otherwise stated. control specificatio ns 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) e f f i c i e n c y 10.8 v 12.0 v 13.2 v vraf - 08at5 1
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 sep . 29 , 20 1 1 bel power inc. , a subsidiary of bel fuse inc. thermal derating curve the thermal reference point tref is show n above. for reliable operation this temperature should not exceed 11 5 ? 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 sep . 29 , 20 1 1 bel power inc. , a subsidiary of bel fuse inc. ripple and noise waveform note: ripple and noise a t vin=12 v, vddq=1. 5 v, io=8 a , with 13 x 10uf 0603 ceramics + 1 x 47uf 1206 ceramic at the output, ta=25 ? c . transient response waveforms 12.5 % to 62.5 % load step at vin= 12 v , vddq=1. 5 v 62.5 % to 12.5 % load step at vin= 12 v , vddq=1. 5 v note: transient response at di/dt= 1 a/us, with 13 x 10uf 0603 ceramics + 1 x 47uf 1206 ceramic 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 sep . 29 , 20 1 1 bel power inc. , a subsidiary 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 sep . 29 , 20 1 1 bel power inc. , a subsidiary of bel fuse inc. me chanical outline pin connections pin function 1 v in 2 v ddq 3 v out 4 gnd 5 enable
? 20 1 1 bel fuse inc. specifications subject to change without notice. 0 929 11 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 sep . 29 , 20 1 1 bel power inc. , a subsidiary of bel fuse inc. revision history date revision changes detail approval 201 1 - 08 - 19 a first release hl 2011 - 8 - 23 b update transient response hl 2011 - 8 - 30 c update transient response hl 2011 - 9 - 29 d update input range h l rohs com p liance complies with the european directive 2002/95/ec, calling for the elimination of lead and other hazardous substances from electronic products.
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