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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 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. features ? non-isolated ? input under-voltage lockout ? high efficiency ? ocp/scp ? fixed frequency ? 2-wire remote sense ? wide input ? 7 bit vid digital voltage programming ? remote on/off ? i2c/smbus available ? consult factory ? class 1, category 2, non-isolated dc/dc converter (refer to ipc-9592) applications ? networking ? computers and peripherals ? telecommunications description the grnd-90a series are non-isolated step down dc/dc converters providing up to 90 a of output current and designed to be compatible with the intel vrm11 requirements. standard features include remote on/off, over current protection, remote sense, vr_hot signal and a power good signal. this product also makes use of adaptive positioning to improve transient response performance. these products may be used almost anywhere low-voltage silicon is being employed and a nominal 12 vdc source is available. typical applications include file servers, work stations and other computing applications. part selection output voltage input voltage max. output current max. output power typical efficiency model number active high 0.82 vdc - 1.6 vdc 10.8 vdc - 13.2 vdc 90 a 144 w 83% GRND-90A161 notes: add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation g r nd ? 90 a 16 1 1 2 3 4 5 6 7 1---goldfinger 2---rohs 6, change ?r? to ?7? means rohs 5 3---series name 4---series code 5---wide input range (10.8-13.2v) 6---wide output range (0.82-1.6v) 7---suffix GRND-90A161 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 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. absolute maximum ratings parameter min typ max unit notes continuous non-operating input voltage -0.3 - 15 v remote on/off -0.3 - 5.5 v ambient temperature 0 - 70 c storage temperature -55 - 125 c note: ratings used beyond the maximum ratings may caus e a reliability degradation of the converter or may permanently damage the device. input specifications parameter min typ max unit notes operating input voltage 10.8 12 13.2 v input current (full load) - - 16 a input current (no load) - - 700 ma remote off input current - 17 - ma input reflected ripple current (rms) - 50 100 ma input reflected ripple current (pk-pk) - 150 200 ma with simulated source impedance of 200nh, 5hz to 20mhz. use 2 * 220uf/16v oscon capacitor i 2 t inrush current transient - - 1 a 2 s turn-on voltage threshold 9.5 10 10.5 v turn-off voltage threshold 8.4 8.9 9.4 v note: all specifications are typical at 25 c unless otherwise stated. output specifications parameter min typ max unit notes output voltage set point 1.27 1.285 1.3 v no load, excluding adaptive positioning, vrm11 vid 0x32 adaptive positioning - 1.25 - mohm droop impedance line regulation - 5 10 mv regulation over temperature (0deg.c-70deg.c) - 5 10 mv ripple and noise (pk-pk) - - 25 mv ripple and noise (rms) - - 10 mv 0-20 mhz bw ripple and noise (pk-pk) under worst case - - 30 mv over all operating input voltage, load and temperature conditions. 0 - 70 a thermal design current output current range - - 90 a peak current rating output dc current limit 95 - 120 a
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 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. output specifications (continued) parameter min typ max unit notes short circuit surge transient - - 5 a 2 s turn on time - 3.5 5 ms overshoot at turn on - - 1 % output capacitance see note 1 3710 see note 1 uf consult factory regarding external capacitance outside of this range transient response overshoot - - 50 mv v50%~100% of max load settling time - - 25 us overshoot - - 50 mv v100%~50% of max load settling time - - 25 us di/dt=300a/us, vin=12vdc, ta=25c notes: 1. measured with 7*470uf/7mohm esr sp-cap, and 42*10uf/1206 ceramic capacitors on output. 2. all specifications are typical at nominal input, full load at 25c unless otherwise stated. general specifications parameter min typ max unit notes efficiency 81 83 - % vin =12v, iout=70a; vid=0x32 switching frequency - 400 - khz over temperature alert 100 - 110 c over voltage protection - vo,set + 0.175 - v weight - 46 - g fit 500 - calculated per bell core sr-332 (vin=12 v, io=70a, t a = 25 c, fit=10 9 /mtbf) dimensions inches (l w h) millimeters (l w h) 3.80 x 1.06 x 0.84 96.52 x 26.80 x 21.21 - note : all specifications are typical at 25 c unless otherwise stated. remote on/off parameter min typ max unit notes signal low (unit off) -0.3 - 0.4 v signal high (unit on) active high 0.8 - 5.5 v the remote on/off pin open, unit on. current sink 0 - 1 ma
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 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. thermal derating curves the thermal reference point tref is shown above. for reliable operation this temperature should not exceed 110 c. the output power of the module should not exceed the rated power for the module. vin=12v, vid=0x32 maximum junction temperature of semiconductors derated to 120 degree c.
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 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. efficiency data 65.00% 70.00% 75.00% 80.00% 85.00% 90.00% 7a 17.5a 35a 52.5a 70a output current(a) efficienc y vid=0x7e vid=0x32 vid=0x02 ripple and noise waveforms ripple and noise at 12vdc input, vid=0x32, iout=0a ripple and noise at 12vdc input, vid=0x32, iout=70a note: ripple and noise at 0-20mhz bw, and ta=25 deg 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 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. transient response waveforms vid=0x32 45a-90a load transients vid=0x32 90a-45a load transients note: transient response at vin=48v, di/dt=5a/us, with typical cap bank on output, and ta=25 deg c. over current protection to provide protection in a fault output overload condition, the module is equipped with internal current-limiting circuitry and can endure current limiting for a few mili-seconds. if the overcurrent condition persists beyond a few milliseconds, the module will shut down into hiccup mo de. the module operates normally when the output current goes into specified range. vin=12v, vid=0x32
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 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. startup & shutdown rise time startup time vid=0x32, vin=12v, iout=70a vid=0x32, vin=12v, iout=70a, ch1: vout ch3: outen
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 8 non-isolated dc/dc converters 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. remote sense this module has remote sense compensation feature. it can minimize the effects of resistance between module?s output and load in system layout and facilitates accurate voltage regulation at load terminals or other selected point. 1. the remote sense lines carries very little current and hence do not require a large cross-sectional area. 2. this module compensates for a maximum drop of 10% of the nominal output voltage. 3. when using remote sense compensation, all the resistance, parasitic inductance and capacitance of the system are incorporated within the feedback loop of this module. it can make an effect on the module's compensation, affecting the stability and dynamic response. a 0.1uf ceramic capacitor can be connected at the point of load to de-couple noise on the sense wires. 4. recommend the connection of remote sense compens ation as below figure. there are a resistor rs+ (51.1 ohm) from vo+ to sense+ and a resistor rs- (51.1 ohm)) from vo- to sense- inside of this module. 5. if not using remote sense compensation, please connec t sense directly to output at module's pin, that is, connect sense+ to vo+ and sense- to vo- at module's pin, the shorter the better. see below figure. sense+ sense- rs- vo- vo+ rs+ load sense+ sense- rs- vo- vo+ rs + load
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 9 non-isolated dc/dc converters 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. input under-voltage lockout power good 1. this module has a power good indicator output. power good pin used positive logic and is open collector. 2. power good pin can sink 1ma. 3. the maximum voltage pulled up externally on power good pin should not exceed 5v. 4. when the output is within 10% of the vi d setting, the power good pin will be pulled high. typical start-up using remote on/off(vin=12.0v, vid=0x32, io=0a) ch1: outen ch2: pwrgd ch4: vout input voltage (v) i n p u t c u r r e n t voltage falling voltage rising v1 v2 under-voltage lockout v1=8.9v v2=10v
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 10 non-isolated dc/dc converters 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. mechanical outline note: 1) undimensioned components are shown for visual reference only. 2) 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). row a row b pin function pin function pin function pin function 1 pwrgd 25-26 gnd 139-140 gnd 164 vbias 2 sc 27-30 vout 135-138 vout 163 sd 3 outen 31-34 gnd 131-134 gnd 162 ll0 4 ll1 35-38 vout 127-130 vout 161 vid6 5 vid5 39-42 gnd 123-126 gnd 160 vid4 6 vid3 43-46 vout 119-122 vout 159 vid2 7 vid1 47-48 gnd 117-118 gnd 158 vid0 8 reserved 49-52 vout 113-116 vout 157 reserved 9 +sense 53-56 gnd 109-112 gnd 156 -sense 10 sp 57-60 vout 105-108 vout 155 vidsel 11 vr_hot 61-64 gnd 101-104 gnd 154 vrm_pres 12 reserved 65-68 vout 97-100 vout 153 buss add - key 69-70 gnd 95-96 gnd - key 13-16 vin 71-74 vout 91-94 vout 149-152 vin 17-20 gnd 75-78 gnd 87-90 gnd 145-148 gnd 21-24 vout 79-82 vout 83-86 vout 141-144 vout
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 11 non-isolated dc/dc converters 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. signal definitions vin input power to the converter gnd common return for both input and output vid0, vid1, vid2, vid3, vid4, vid5, vid6 logic level inputs used to set the output voltage, refer to vid table. connect vid0 thru vid6 pins to open-drain outputs with external pull-up resistors. valid logic low is -0.3v to 0.4v, valid logic high level is 0.8v to 5.5v. vidsel digital input used to select between extended vr10 and vr11 vid tables. internally pulled up to 3.3v to select vrm11. pwrgd the open drain power good signal indicates the output voltage is within 10% of the vid setpoint. vsense+, vsense- remote voltage sense lines. connect these at the point of load, to vout and gnd respectively. vout output voltage available to the load. outen logic level input used to enable the converter when high. valid logic low is -0.3v to 0.4v, valid logic high level is 0.8v to 5.5v ll0/ll1 load line select pins. working in conjunction with vid_sel, ll0/ll1 are used to select load line slope. currently only 1.25mohm slope is supported. module can be configured to support multiple load line slopes. sc sd optional serial clock and data pins respectively for smbus interface. sp optional programming pin for set point and over current protection mode. vr_hot# open-drain output signal, pulled actively low indicating a thermal event has been detected on the vrm. vrm_pres signal used by system to indicate the vrm is present in the design. buss_add optional addressing pin when using smbus feature.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 12 non-isolated dc/dc converters 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr. 01, 2010 bel power inc., a subsid iary of bel fuse inc. vid codes (vrm11.0 vid codes) hex vout hex vout hex vout (vid6 - vid0) (vdc) (vid7 - vid0) (vdc) (vid7 - vid0) (vdc) 0 0 off 3 0 1.31250 6 0 1.01250 0 1 off 3 1 1.30625 6 1 1.00625 0 2 1.60000 3 2 1.30000 6 2 1.00000 0 3 1.59375 3 3 1.29375 6 3 0.99375 0 4 1.58750 3 4 1.28750 6 4 0.98750 0 5 1.58125 3 5 1.28125 6 5 0.98125 0 6 1.57500 3 6 1.27500 6 6 0.97500 0 7 1.56875 3 7 1.26875 6 7 0.96875 0 8 1.56250 3 8 1.26250 6 8 0.96250 0 9 1.55625 3 9 1.25625 6 9 0.95625 0 a 1.55000 3 a 1.25000 6 a 0.95000 0 b 1.54375 3 b 1.24375 6 b 0.94375 0 c 1.53750 3 c 1.23750 6 c 0.93750 0 d 1.53125 3 d 1.23125 6 d 0.93125 0 e 1.52500 3 e 1.22500 6 e 0.92500 0 f 1.51875 3 f 1.21875 6 f 0.91875 1 0 1.51250 4 0 1.21250 7 0 0.91250 1 1 1.50625 4 1 1.20625 7 1 0.90625 1 2 1.50000 4 2 1.20000 7 2 0.90000 1 3 1.49375 4 3 1.19375 7 3 0.89375 1 4 1.48750 4 4 1.18750 7 4 0.88750 1 5 1.48125 4 5 1.18125 7 5 0.88125 1 6 1.47500 4 6 1.17500 7 6 0.87500 1 7 1.46875 4 7 1.16875 7 7 0.86875 1 8 1.46250 4 8 1.16250 7 8 0.86250 1 9 1.45625 4 9 1.15625 7 9 0.85625 1 a 1.45000 4 a 1.15000 7 a 0.85000 1 b 1.44375 4 b 1.14375 7 b 0.84375 1 c 1.43750 4 c 1.13750 7 c 0.83750 1 d 1.43125 4 d 1.13125 7 d 0.83125 1 e 1.42500 4 e 1.12500 7 e 0.82500 1 f 1.41875 4 f 1.11875 7 f 0.81875 2 0 1.41250 5 0 1.11250 2 1 1.40625 5 1 1.10625 2 2 1.40000 5 2 1.10000 2 3 1.39375 5 3 1.09375 2 4 1.38750 5 4 1.08750 2 5 1.38125 5 5 1.08125 2 6 1.37500 5 6 1.07500 2 7 1.36875 5 7 1.06875 2 8 1.36250 5 8 1.06250 2 9 1.35625 5 9 1.05625 note: vids with vid7=1 not shown because this vrm does not have a vid7 pin. 2 a 1.35000 5 a 1.05000 2 b 1.34375 5 b 1.04375 2 c 1.33750 5 c 1.03750 2 d 1.33125 5 d 1.03125 2 e 1.32500 5 e 1.02500 2 f 1.31875 5 f 1.01875
? 2010 bel fuse inc. specifications subject to change without notice. 040110 13 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 10.8 vdc - 13.2 vdc input, 0.82 vdc - 1.6 vdc output, vrm11.0 compatible apr 01, 2010 bel power inc., a subsid iary of bel fuse inc. revision history date revision changes detail approval 2009-9-8 a first release jack fan 2010-4-1 b 1. update output current limit; 2. update md( the model height change to 0.84?? max) jack fan rohs compliance 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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