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programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 1 the sc1144 is patent pending pentium is a registered trademark of intel corporation block diagram pin configuration features ? allows use of small surface mount components ? ultra fast transient recovery time ? wide, high frequency operating range ? selectable 2, 3, 4 phase operation ? floating feedback ground for remote sensing ? precision load current sharing ? selectable internal or external clock ? soft start, over current protection ? 5-bit dac programmable output ? programmable clock, 200khz-2mhz per phase applications ? high end servers and workstations ? high current/ultra-fast transient microprocessors ? voltage regulator modules tel:805-498-2111 fax:805-498-3804 web:http:// www.semtech.com device (1) package temp. (t j ) sc1144abcsw so-24 0 - 85c ordering information note: (1) add suffix ?tr? for tape and reel. description the sc1144 is a high performance, multi-phase (pwm) controller designed for high power micropro- cessors requiring ultra fast transient response, such as the pentium ? ll and beyond. utilizing a novel and unique design, the controller distributes the output load across (up to) four converter channels by digitally phase shifting the pwm outputs. this approach greatly reduces the stress and heat on the output stage components while lowering input ripple current by as much as 80%. accurate current sharing among the four phases is achieved by precision design tech- niques and trimming of critical elements. the high speed transconductance error amplifier is externally initialized using a soft-start capacitor allow- ing the controller to ?wake-up? without overshoot, thus protecting the low voltage microprocessor loads. the output drive voltage to the power mosfets is pro- grammable to minimize switching losses in the drive circuitry. the floating feedback ground allows remote sense ca- pability. the output voltage is digitally programmable by means of a 5 bit dac. a single resistor programs the master clock frequency (8mhz max) or the con- troller may be synchronized using an external oscilla- tor. the number of operating phases is programmed independently of the external clock. the parts features under-voltage lock-out with hysteresis and over- current protection. (24-pin soic) top view
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 2 the sc1144 is patent pending electrical characteristics unless otherwise noted: t a = 25 c, v cc 5v = 5v, v cc 12v = 12v, 4-phase operation. parameter symbol conditions min typ max units supply voltage range v cc12v 10.0 12.0 14.0 v uvlo range v cc5v 3.9 v uvlo hystersis v cc5v 50 mv uvlo range v cc12v 9.0 v uvlo hystersis v cc12v 100 mv supply voltage range v cc5v 4.5 5.0 5.5 v supply current v cc12v drv outputs open 12 20 ma supply current v cc5v v out = 2.00v, i o = 0 40 ma reference current pin voltage v ref iref = 250a 2.05 v vid0-4 clock select & divide v inl logic low 0.8 v select logic threshold v inh logic high 2 v vid0-4 clock select & divide i inl vid0-4=0v -20 a select input bias current i inh vid0-4=4.5v +50 a enable pin v inl .8 v v inh 2v drv0-3 output voltage v ol i sink = 1ma .3 v v oh i source =1ma,outv=v cc12 v cc12 -1 v drv0-3 source current i src v out = 2.00v 20 ma drv0-3 sink current i snk v out = 2.00v 40 ma absolute maximum ratings parameter symbol limits units v cc5v to gnd v cc5v -0.3 to + 12 v fbg to gnd fbg 1 v v cc12v to gnd v cc12v -0.3 to +20 v operating temperature range t a 0 to +70 c junction temperature range t j 0 to +125 c storage temperature range t stg -55 to +150 c thermal resistance junction to case jc 25 c/w thermal resistance junction to ambient ja 80 c/w lead temperature (soldering) 10 sec t lead 300 c
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 3 the sc1144 is patent pending electrical characteristics (cont.) unless otherwise noted: t a = 25 c, v cc5v = 5v, v cc12v = 12v, 4-phase operation. parameter symbol conditions min typ max units bgout voltage v bgout vid = 00000 2.05 v bgout impedance r o_bg 3 k ? external clock freq. range f ext_ck .80 8.0 8.5 mhz oscillator frequency accuracy f osc iref = 250a 7.2 8.0 8.8 mhz internal clock freq. range f int_ck .80 8.0 8.5 mhz match drv0-3 ? d duty cycle deviation from avg. -1 +1 % pwm off time toff 25 % drive voltage range outv output freq. = 2mhz/phase v o = 2.000v 51012 v overcurrent comparator, comparator, common mode range occ_cmr 3 15 v oc+i/p bias current ib_oc+ vin = 5v,roc+<20kohm +75 185 +250 oc-i/p bias current ib_oc- vin = 5v,roc-<20kohm +75 125 +250 input offset voltage vos_occ vin = 5v 10 mv feedback input impedance ri_fb v o = 2.00v 12 ? maximum duty cycle dmax fb=0v 75 % mimimum duty cycle dmin fb=4.0v 0 % converter specifications, reference application circuit output accuracy over set range v out vid 0-4 = 0000-1111 v cc5v = 5.0v -1 +1 % load regulation v o = 2.000v i o = 3a - 20a .025 .05 %/a line regulation v cc5v = 5v, v o = 2.000v v in = 4-6v, (vin separated from vcc5v) i o = 5a , clk = external .15 %/v o out i v ? ? in out v v ? ?
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 4 the sc1144 is patent pending note: (1) all logic inputs and outputs are open collector ttl compatible. pin description pin # pin name pin function 1v cc 5v supply voltage input (5v nominal) 2 divsel connect to gnd for four phase operation and to logic high for three phase operation. 3 clksel clock select: logic high selects internal clock. logic low selects external clock. 4 extclk external clock input. the output frequency is determined by (clock input freq.)/4. output freq.= (clock input)/4. pull up to vcc5v to select internal clock. 5r ref connects to external reference resistor. sets the operating frequency of the internal clock and the ramp time for the pwm. reference voltage at this pin is 2.05v. trimmed to set 250a at 8mhz. 6vid0 (1) programming input (lsb) 7vid1 (1) programming input 8vid2 (1) programming input 9vid3 (1) programming input 10 vid4 (1) programming input (msb) 11 oc+ over current comparator. non-inverting input. 12 oc- over current comparator. inverting input. 13 comp compensation pin. compensation is acheived by connecting a capacitor in series with a resistor between this pin and fbg. a 300k ohm resistor must also be directly connected between this pin and fbg. 14 fb feedback input connected to supply output. 15 b gout bandgap reference output. output resistance=3kohm. must be bypassed with 4.7nf -100nf capacitor to fbg. this capacitor programs the soft start time. 16 fbg feedback ground. this pin must be connected to return side of output caps. this pin is floating, (within one diode drop of gnd pin). 17 enable connects to 5v to enable. connect to gnd to disable entire device. 18 gnd ground pin 19 drv2 phase 2 output 20 drv0 phase 0 output 21 v cc12v supply voltage for the fet drivers/drv0-3 22 drv1 phase 1 output 23 drv3 phase 3 output 24 outv sets the maximum drv0-3 drive voltage in order to reduce switching losses in the external mosfets.
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 5 the sc1144 is patent pending output voltage unless specified: 0 = gnd; 1 = high (or floating). t a = 25 c, v cc5v = 5v, v cc12v = 12v, 4-phase operation. parameter vid 43210 min typ max output voltage 01111 1.287 1.300 1.313 01110 1.336 1.350 1.364 01101 1.386 1.400 1.414 01100 1.435 1.450 1.465 01011 1.485 1.500 1.515 01010 1.534 1.550 1.566 01001 1.584 1.600 1.616 01000 1.633 1.650 1.667 00111 1.683 1.700 1.717 00110 1.732 1.750 1.768 00101 1.782 1.800 1.818 00100 1.831 1.850 1.869 00011 1.881 1.900 1.919 00010 1.930 1.950 1.970 00001 1.980 2.000 2.020 00000 2.029 2.050 2.071 11111 1.980 2.000 2.020 11110 2.079 2.100 2.121 11101 2.178 2.200 2.222 11100 2.277 2.300 2.323 11011 2.376 2.400 2.424 11010 2.475 2.500 2.525 11001 2.574 2.600 2.626 11000 2.673 2.700 2.727 10111 2.772 2.800 2.828 10110 2.871 2.900 2.929 10101 2.970 3.000 3.030 10100 3.069 3.100 3.131 10011 3.168 3.200 3.232 10010 3.267 3.300 3.333 10001 3.366 3.400 3.434 10000 3.465 3.500 3.535
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 6 the sc1144 is patent pending typical application circuit {doc} {revcode} sc1144 application circuit a 11 wednesday, january 06, 1999 title size document number rev date: sheet of vid2 vid1 vid4 vid3 vid0 +5v vout 12v 22u,10v 2k 22u,10v 1u,10v 2.7k 22u,10v .022 .01u 300k 22u,10v 1u, 16v *3 ext. load 1u 1000uf 10 .01 8.2k .001 .1u 10u 22u,10v .008 22u,10v 22u,10v 22u,10v 22u,10v 22u,10v 22u,10v 22u,10v 2222 22u,10v 22u,10v 20n03 2907 20n03 1u,10v 300nh 300nh 2.2 1u,10v 2907 20n03 1u,10v 20n03 mbrd835 mbrd835 300nh 2907 22u,10v 2222 2.2 2.2 2.2 300nh 2222 mbrd835 mbrd835 2907 2222 1k 12 10k sc1144-soic 12 9 2 3 1 13 7 5 6 11 14 4 10 15 16 17 18 19 20 21 22 23 24 8 oc- vid3 divsel clksel vcc5v comp vid1 rref vid0 oc+ fb extclk vid4 bgout fbg enable gnd drv2 drv0 vcc12v drv1 drv3 outv vid2 10 output voltage sense ceramic surface mount (1210) caps iout=0-25amps vout=1.3-3.5volts
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 7 the sc1144 is patent pending a sc1144evb1 evaluation board b 11 wednesday, july 07, 1999 title size document number rev date: sheet of vcc5v en vout vid2 vcc5v vout en vid0 vid3 vid1 +5v vid4 vout 12v 2.2 r19 22u,10v c41 22u,10v c4 r26 10k 22u,10v c25 r21 10k 10k r12 irf7811 q8 irf7811 q11 j2 osc 1u,16v c36 22u,10v c6 r22 10k 1u,10v c44 51 r13 300nh l2 2.2 r5 fmmt618 q4 1u,16v c37 22u,10v c7 22u,10v c10 100uf c28 250 r7 irf7811 q5 1u,10v c45 1u,10v c46 22u,10v c5 835l d3 2.2 r6 1u,10v c40 51 r16 1u,10v c47 22u,10v c12 51 r14 fmmt618 q10 fmmt618 q7 r25 10k .01u c27 j1 input 1 2 3 4 5 6 fmmt718 q12 .01u c31 1000uf c35 300k r17 10uf c30 1u,10v c42 .1u c48 4.75k r18 22u,10v c3 22u,10v c15 c33 .01 2.2 r8 8.2k r10 51 r15 s1 vout/clk switch 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 sel. r11 22u,10v c43 2.2 r20 2.2 r3 835l d2 22u,10v c22 22u,10v c8 fmmt718 q6 835l d4 .1u c32 300nh l4 1u,10v c2 300nh l3 sc1144abcsw u1 12 9 2 3 1 13 7 5 6 11 14 4 10 15 16 17 18 19 20 21 22 23 24 8 oc- vid3 divsel clksel vcc5v comp vid1 rref vid0 oc+ fb extclk vid4 bgout fbg enable gnd drv2 drv0 vcc12v drv1 drv3 outv vid2 10 r9 1u,16v c38 300nh l1 835l d1 10 r2 1u,10v c34 irf7811 q2 u2 pentiumii a1 a2 a3 a4 a5 a6 a7 a8 a9 a10 a11 a12 a13 a14 a15 a16 a17 a18 a19 a20 a21 a22 a23 a24 a25 a26 a27 a28 a29 a30 a31 a32 a33 a34 a35 a36 a37 a38 a39 a40 a41 a42 a43 a44 a45 a46 a47 a48 a49 a50 a51 a52 a53 a54 a55 a56 a57 a58 a59 a60 a61 a62 a63 a64 a65 a66 a67 a68 a69 a70 a71 a72 a73 a74 a75 a76 a77 a78 a79 a80 a81 a82 a83 a84 a85 a86 a87 a88 a89 a90 a91 a92 a93 a94 a95 a96 a97 a98 a99 a100 a101 a102 a103 a104 a105 a106 a107 a108 a109 a110 a111 a112 a113 a114 a115 a116 a117 a118 a119 a120 a121 b1 b2 b3 b4 b5 b6 b7 b8 b9 b10 b11 b12 b13 b14 b15 b16 b17 b18 b19 b20 b21 b22 b23 b24 b25 b26 b27 b28 b29 b30 b31 b32 b33 b34 b35 b36 b37 b38 b39 b40 b41 b42 b43 b44 b45 b46 b47 b48 b49 b50 b51 b52 b53 b54 b55 b56 b57 b58 b59 b60 b61 b62 b63 b64 b65 b66 b67 b68 b69 b70 b71 b72 b73 b74 b75 b76 b77 b78 b79 b80 b81 b82 b83 b84 b85 b86 b87 b88 b89 b90 b91 b92 b93 b94 b95 b96 b97 b98 b99 b100 b101 b102 b103 b104 b105 b106 b107 b108 b109 b110 b111 b112 b113 b114 b115 b116 b117 b118 b119 b120 b121 vcc_vtt gnd vcc_vtt ierr# a20m# gnd ferr# ignne# tdi gnd tdo pwrgood testhi gnd thermtrip# reserved $pin16 gnd $pin18 $pin19 $pin20 gnd $pin22 $pin23 $pin24 gnd $pin26 $pin27 $pin28 gnd $pin30 $pin31 $pin32 gnd $pin34 $pin35 $pin36 gnd $pin38 $pin39 $pin40 gnd $pin42 $pin43 $pin44 gnd $pin46 $pin47 $pin48 gnd $pin50 $pin51 $pin52 gnd $pin54 $pin55 $pin56 gnd $pin58 $pin59 $pin60 gnd $pin62 $pin63 $pin64 gnd $pin66 $pin67 $pin68 gnd $pin70 $pin71 $pin72 gnd $pin74 $pin75 $pin76 gnd $pin78 $pin79 $pin80 gnd $pin82 $pin83 $pin84 gnd $pin86 $pin87 $pin88 gnd $pin90 $pin91 $pin92 gnd $pin94 $pin95 $pin96 gnd $pin98 $pin99 $pin100 gnd $pin102 $pin103 $pin104 gnd $pin106 $pin107 $pin108 gnd $pin110 $pin111 $pin112 gnd $pin114 $pin115 $pin116 gnd vid[2] vid[1] vid[4] $pin121 $pin122 $pin123 $pin124 vcc_vtt $pin126 $pin127 $pin128 vcc_vtt $pin130 $pin131 $pin132 vcc_core $pin134 $pin135 $pin136 vcc_core $pin138 $pin139 $pin140 $pin141 $pin142 $pin143 $pin144 vcc_core $pin146 $pin147 $pin148 vcc_core $pin150 $pin151 $pin152 vcc_core $pin154 $pin155 $pin156 vcc_core $pin158 $pin159 $pin160 $pin161 $pin162 $pin163 $pin164 vcc_core $pin166 $pin167 $pin168 vcc_core $pin170 $pin171 $pin172 vcc_core $pin174 $pin175 $pin176 vcc_core $pin178 $pin179 $pin180 $pin181 $pin182 $pin183 $pin184 vcc_core $pin186 $pin187 $pin188 vcc_core $pin190 $pin191 $pin192 vcc_core $pin194 $pin195 $pin196 vcc_core $pin198 $pin199 $pin200 $pin201 $pin202 $pin203 $pin204 vcc_core $pin206 $pin207 $pin208 vcc_core $pin210 $pin211 $pin212 vcc_core $pin214 $pin215 $pin216 vcc_core $pin218 $pin219 $pin220 $pin221 $pin222 $pin223 $pin224 vcc_core $pin226 $pin227 $pin228 vcc5 $pin230 $pin231 $pin232 vcc_l2 $pin234 $pin235 $pin236 vcc_l2 $pin238 vid[3] vid[0] vcc_l2 22u,10v c39 fmmt718 q9 100uf c29 22u,10v c17 3.24k r4 .1u c49 470uf,opt. c50 fmmt718 q3 fmmt618 q1 long pcb trace sc1144_evb * * req'd at freq.<1mhz/phase or for +12v input operation evaluation board schematic
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 8 the sc1144 is patent pending bill of material item qty reference value manufacturer 1 11 c2,c34,c36,c37,c38,c40,c42,c44,c45,c46,c47 1u,10v avx (818)883-7606 x7r 2 15 c3,c4,c5,c6,c7,c8,c10,c12,c15,c17,c22,c25,c39,c41,c 43 22u,10v murata (512)250-5082 pn #grm235y5v226z010 3 2 c27,c31 .01u avx,murata,nichicon 4 2 c29,c28 100uf, 6.3v murata,al. elec. 5 1 c30 10uf, 6.3v murata,al. elec. 6 1 c32 .001 murata 7 1 c33 .01u murata 8 1 c35 1000uf, 6.3v murata,al. elec. 9 1 c48 .1u murata,x7r 10 4 d1,d2,d3,d4 835l motorola 11 1 j1 input 12 1 j2 osc 13 4 l1,l2,l3,l4 300nh, 8amp or 450nh, 8amp falco (305)662-7276 pn #t025a2 or to25o2 13a 4 l1,l2,l3,l4 300nh, 6amp steward pn# di2220v301r-00 14 4 q1,q4,q7,q10 fmmt618 zetex 15 4 q2,q5,q8,q11 20n03hl motorola 16 4 q3,q6,q9,q12 fmmt718 zetex 19 2 r2,r9 10 dale,any 20 6 r3,r5,r6,r8,r19,r20 2.2 dale 21 1 r4 680 any 22 1 r7 250 any 23 1 r10 8.2k any 24 1 r11 2.32k any 25 1 r12 3k any 26 4 r13,r14,r15,r16 51, 1/4w, 1206 dale 27 1 r17 300k any 28 1 r18 4.75k any 29 4 r21,r22,r25,r26 10k any 30 1 s1 vout/clk switch c&k (800)cal-swch 31 1 u1 sc1144abcsw semtech (805)498-2111 32 1 u2 pentiumii conn. foxconn (714)256-1880 unless otherwise noted, all resistors are 1/10w, 5%, 0805 and all capacitors are 20%, 50v, 0805.
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 9 the sc1144 is patent pending functional description the sc1144 is a programmable, high performance, multi-phase controller designed for the most demand- ing dc/dc converter applications in which transient response, space, input ripple current and component form factor and cost are paramount. the sc1144 based dc/dc converter consists of four asynchronous converters. the gate drives to the converters are alter- nated sequentially by the sc1144 allowing equal shar- ing of the load current among the stages. the high clock frequency allows for smaller inductor value and miniature surface mount, low inductance output capaci- tors. since each stage has ? the output current, the conduction losses in each stage is reduced by a factor of 1/16. precision active trimming ensures 1% match- ing of duty cycles among phases, thus ensuring the heat and component stress is shared equally. this al- lows use of lower cost components in each phase and virtual elimination of heat sinks. decoder/bias generator/pwm controller the 8 mhz clock is divided down to 2 mhz for four phase operation by the clock decoder. the start of the output pulses are time shifted 90 degrees by the de- coder with respect to each other. the bias generator generates the ramps to each phase by a precision trimmed current source and on-chip capacitors. the decoder, which is synchronized to the bias generator via the master clock, phase shifts the ramps and en- ables the pwm controller sequentially. a resistor from r ref pin to fbg programs the frequency and ramp time. the ramps are then compared to the error ampli- fier output at the high speed pwm comparator inputs. the oscilator master clock frequency is programmed as follows: clock freq=(8.2k/rref)*8mhz error amplifier at the heart of the controller is an ultra-fast, transcon- ductance error amplifier. since the output inductor val- ues can be selected to be a minimum, usually less than a micro-henry, the delays due to inductor ramp time are minimized during transient load recovery. the higher frequency of operation also allows use of much smaller capacitance on the output. this means that the dc/dc converter output capacitors ?hold time? is less. the er- ror amplifier must therefore respond extremely fast ?recover the fort? after a transient. the sc1144 error amplifier recovers to its normal duty cycle after applica- tion of a full load transient within 2 usec maximum, (largely dependant on input and output capacitance) and usually within 1usec. this minimizes undershoot and overshoot during application of a transient. operation at high frequency minimizes the output inductor thus allow- ing faster current ramp to the output capacitors. the effective gain of the error amplifier stays constant in both vid ranges, keeping the loop gain constant regard- less of output voltage range. theory of operation fig. 4: v out ripple, v out = 2.0v, i out = 30a fig. 1: the four gate drives firing 90 out of phase. v out = 2.0v, i out = 10a
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 10 the sc1144 is patent pending bandgap reference/soft start the precision internal bandgap reference provides a stable, temperature compensated 2.05 v reference for the error amplifier?s non-inverting input, the d acref for the vid digital to analog converter, the under-voltage lock-out circuitry as well as the reference for the bias generator current sources. the error amplifiers non- inverting input is connected to the bandgap reference through a 3 kohm resistor, which is also externally con- nected to a soft-start capacitor via the b gout pin. upon application of power, the non-inverting input of the er- ror amplifier is held low for a short time allowing for the decoder and pwm controller to settle. this prevents any harmful output voltage overshoots upon start up or after a converter shut-down (as a result of over-current or the enable pin pulled low). the non-inverting input then ramps up according to the rc time constant al- lowing gradual rise of output voltage. isolated feedback ground the feedback ground pin on the sc1144, fbg, is iso- lated from the gnd. the maximum voltage between the two pins is set by the esd diode forward voltage drop. this allows the sc1144 to be configured for re- mote sensing thus compensating for wiring and con- nector voltage drops at high currents or during tran- sients. remote sensing is typically implemented by using differential amplifiers. the use of this feature on the sc1144 eliminates the need for additional compo- nents. over-current comparator the sc1144 has an internal over-current comparator designed to sense current in the input supply path. the comparator inputs have a high common voltage range thus allowing operation under all possible volt- age/current combinations. the output of the compara- tor pulls the b gout (soft start) pin low thus disabling the error amplifier and causing the pwm outputs to enter minimum duty cycle mode. synchronous vs. asynchronous mode the sc1144 can be configured to drive synchrounous msofet drivers, such as the sc1405 for higher effi- ciency. refer to sc1405 datasheet for example de- signs. component selection and layout consid- erations care must be taken in component selection and pcb layout in high frequency power appliactions. refer to sc1144evb user manual for more application informa- tion on component selection and layout guidlines as well as example artwork and bill of materials. error amplifier cont. fig. 3: top trace, gate drive responding to removal of transient load. bottom trace, load current transient 16a/div. fig. 2: transient response, top trace, current sense 8a/div @ 30a/usec. bottom trace, v out .
programmable, high performance multi-phase, pwm controller sc1144 ? 1999 semtech corp. 652 mitchell road newbury park ca 91320 preliminary - august 24, 1999 11 the sc1144 is patent pending outline drawing - so-24 jedec ms-013ad b17104b an evaluation board is available which may be ordered directly from the factory. sc1144evb is a dc/dc con- verter utilizing the sc1144 four-phase controller in an asynchronous appliaction. the sc1144-synch-evb uti- lizes sc1405 high speed mosfet drivers to drive the top and synchronous mosfets with enhanced features. the evaluation boards are intended as guidelines for board design, layout and to assess key performance parame- ters, such as transient response, thermal stress management and input and output ripple considerations. the sc1144evb includes a slot1 connector for pentium ii, a dip switch for mode/voltage selection as well as quali- fied selection of components for the sc1144 operation. the sc1144evb user manual contains useful applications information. both evaluation boards may be ordered from our website at www.semtech.com.

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