cm8501/a 1.5a b us t erminator general description features patent f iled #6,452,366 8-pin psop, 16 pin pt ssop and 16 pin psop pow er packages source and sink up to 1.5a, no heat sink required peak current to 3a integrated pow e r mosf et s output voltage can be programm ed by external resistors (cm8501) separate voltages for vccq and pvdd v out of 3% or less at 1.5a minimum external components shutdow n for standby or suspend mode operation t hermal shutdow n protection soft start t he cm8501/a is a low cost sw itching regulator designed to provide a desired output volt age or termination voltage for various applications by conv erting voltage supplies ranging from 2.0v to 4.0v. t he cm8501 can be implemented to produce regulated output voltages in tw o different modes. in the default mode, w hen the vi n/2 pin is open, the output voltage is 50% of the vccq. t he cm8501 can also be used to produce various user-defined voltages by forcing a voltage on the vin/2 pin. in this case , the output voltage follow s the vin/2 pin input voltage. t he regulated output voltage of cm8501a is internally set to be 50% of the applied vccq. t he sw itching regulator is capabl e of sourcing or sinking up to 1.5a of current w h ile regulating an output v tt voltage to w i thin 3% or less. the cm8501a could guarantee to prov ide continuous s i nk ing or s ourc i ng up to 2 a c u rre nt w h ile e n la rging the la y out gnd pa d dime ns ion a s la y out s ugge s t ion in pa ge 6. t he cm8501/a provides low pr ofile 8-pin psop package to save sy stem space as w e ll as 16-pin psop and pt ssop packages that are pin-to-pin compatible to the previous cm8500. 24 hours technical support---websim champion provides customers an online circuit simulation tool called w ebsim. you could simply logon our w ebsite at www. c h a m p i o n - m i c r o . c o m f o r d e t a i l s . applications mother board pci/agp graphics game/ play station set t op box ipc scsi-iii bus terminator buck converter 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 1
cm8501/a 1.5a b us t erminator 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 2 pin configuration psop-16 (ps16)/pt ssop-16 (pt 16) t op view psop-8 (ps08) t op view 1 2 3 4 8 7 6 5 vc c a vc c q ag n d sd pvd d vl pg nd vf b 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 vc ca nc nc nc ag n d sd vi n / 2 ag sen nc pv dd vl pg nd nc vfb vc cq nc pin description pin no. ope r a t ing ra ting 8501 8501a sy mb o l descrip tio n m i n . t y p . ma x . unit 1 1 vcca voltage supply for internal circuits 2 2.5 5.5 v 2 , 3 , 4 , 9 , 1 2 , 1 6 - - n c no c o n n e c t i o n 5 3 agnd ground for internal reference voltage divider shutdow n level 0.75 x vcca vcca+ 0 .3 6 4 s d cmos input level enable level 0 2.0 v 7 -- vin/2 input for external re ference voltage vccq/2 v 8 - - agsen ground for remote sensing 1 0 2 vccq voltage reference for external voltage divider 2.5 v 11 5 vf b f eedback node for the v tt v c c q / 2 v 13 6 pgnd ground for output pow er transistors 1 4 7 v l output voltage/induc tor connection (idd1+ i dd2, output rms current) - 2 . 0 + 2 . 0 a 15 8 pvdd voltage supply for output pow er transistors 2 2.5 5.5 v ordering information part nu mb er t e mp eratu r e ran g e packag e CM8501IT -40 to 85 16-pin pt ssop (pt 16) cm8501is -40 to 85 16-pin psop (ps16) cm8501ais -40 to 85 8-pin psop (ps08) cm8501git * -40 to 85 16-pin pt ssop (pt 16) cm8501gis* -40 to 85 16-pin psop (ps16) cm8501agis* -40 to 85 8-pin psop (ps08) *note: g : suffix for pb f r ee product
cm8501/a 1.5a b us t erminator block diagram ramp amp comparator thermo- protection + - error amp 100k 20pf s r q q oscillator ramp generator vcca 1 vl 7 vccq 2 pgnd 6 sd 4 100k + - vfb 5 pvdd 8 agnd 3 block dia g ra m- 8 pin 100k oscillator/ ramp generator 7 vin/2 100k 14 vl thermal protection 11 vfb ramp amp comparator 13 pgnd 12 nc 9 nc 10 vccq + - 20pf error amp s r q q 5 agnd 3 nc 4 nc 15 pvdd 1 vcca + - 2 nc 6 sd 8 agsen 16 nc block dia g ra m- 16 pin 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 3
cm8501/a 1.5a b us t erminator application circuits c2 105 jp3 1 2 3 l1 3.3uh note: u1 cm8501 2 1 3 4 5 6 7 8 vccq vcc agnd sd fb pgnd vl vdd j1 pwr/in 1 2 r1 100k 2 1 jp3---->useing internal reference source(pin 1, 2 short) vdd r5 0 2 1 c6 220uf/6.3v tp1 bnc 1 2 3 4 5 u2 cm-431 1 3 2 j2 vtt 1 2 1.5a ddr bus terminator demo board circuit d1 sk12 c5 104 r3 100k 2 1 vcc c8 10uf/6.3v jp3---->useing external reference source(pin 2,3 short) r2 1k 2 1 r4 1k 2 1 c3 470 r6 5r1 2 1 vdd vcc c4 105 jp1 jumper c7 104 jp4 on/off sw jp2 jumper d2 sk12 j3 vref-out 1 2 c1 100uf/6.3v 8-pin schematic vcc jp3---->useing external reference source(pin 2,3 short) jp1 jumper c7 104 u1 cm8501 2 1 3 13 14 15 16 4 5 6 7 8 9 10 11 12 nc v cca nc pgn d vl pvd d nc nc agn d sd vi n / 2 agsen n c vc c q vfb nc r5 0 2 1 c3 470 c9 102 c2 105 d1 sk12 note: c1 100uf/6.3v jp4 on/off sw r6 5r1 2 1 vdd j1 pwr/in 1 2 r1 100k 2 1 vdd jp3---->useing internal reference source(pin 1, 2 short) jp3 1 2 3 1.5a ddr bus terminator demo board circuit d2 sk12 r4 1k 2 1 c4 105 r3 100k 2 1 j3 vref-out 1 2 jp2 jumper c6 220uf/6.3v vcc l1 3.3uh tp1 bnc 1 2 3 4 5 r2 1k 2 1 u2 cm-431 1 3 2 c8 10uf/6.3v c5 104 j2 vtt 1 2 16-pin sch e matic 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 4
cm8501/a 1.5a b us t erminator absolute maximum ratings junction t e mperature ...???????? ????150c absolute maximum ratings are those values bey ond w h ich the device could be permanently damaged. storage t e mperature ?? ................??. -65 c to 125c pvdd/vcca/vccq ......................................?.......-0.3v to 4.0v lead t e mperature (s oldering, 5 sec)??????.. 300c voltage on any other pin ????... gnd ? 0.3v to vcc + 0.3v 16-pin package t hermal resistance ?( ja )?.. .. .40c/w output rms current, source or sink .....????........?...1.5a 8-pin package t hermal resistance ?( ja )?.?.. .50c/w operating conditions temperature range ............................. -40c to 85c p vdd operating range .........................2.0v to 4.0v electri cal characteristics (un l ess o t h e r w ise stated , th ese sp e c ificatio n s ap p l y t a =2 5 c ; vcca =+3.3v and pvdd=+3.3v) maximum ratings are stress ratings only and functional device operat ion is not implied. (note 1) cm8501/a sy m b o l p a ra me te r te s t conditions m i n . t y p . ma x . unit switching regula tor vccq = 2.3v 1.12 1.15 1.18 v vccq = 2.5v 1.22 1.25 1.28 v iout = 0, note 2 vccq = 2.7v 1.32 1.35 1.38 v vccq = 2.3v 1.09 1.15 1.21 v vccq = 2.5v 1.19 1.25 1.31 v vl output voltage, sst l_2 iout = 1.5a, note 2 note 3 vccq = 2.7v 1.28 1.35 1.42 v vccq = 2.3v 1.139 1.15 1.162 v vccq = 2.5v 1.238 1.25 1.263 v v in /2 internal resistor divider iout = 0 note 2 vccq = 2.7v 1.337 1.35 1.364 v z in v in /2 reference pin input impedance n ote 2 vccq = 0 50 k fsw s w i t c h i n g f r equency cm 8 5 0 1 / a 0 . 9 1 . 2 1 . 5 m h z i out ( rm s) minimum output rms curr e n t c m 8 5 0 1 / a 1 . 5 2 . 0 a i ou t ( peak) maximum output peak current cm8501/a 3 a ot s o v e r t e mperature shutdow n c m 8 5 0 1 / a 1 3 5 1 5 0 mosfets rds (o n) drain to source on-state r e s i s t a n c e p v d d = 5 v 2 5 0 m supply i v cca quiescent current vfb = 1.4v lc unconnected 2 2 0 a i pvd d vfb = 1.4v lc unconnected 5 0 0 a note 1: limits are guaranteed by 100% testing, sampling, or correlation w i th w o rst case test conditions note 2: vcca, pvdd = 3.3v 10%, vin/2= open for cm8501 note 3: guaranteed by design, not 100% test 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 5
cm8501/a 1.5a b us t erminator functional description t he cm8501/a is a sw itching r egulator that is capable of sinking and sourcing 1.5a of cu rrent w i thout an external heat sink. cm8501/a uses a st andard surface mount pt ssop and psop package w i th bottom metal exposed and the heat can be piped through the bottom of the device and onto the pcb. t he cm8501/a integrates pow er mosf et s that are capable of source and sink 1.5a of curr ent w h ile maintaining excellent voltage regulation. t he output voltage can be regulated w i thin 3% or less by using the exte rnal feedback. separate voltage supply inputs have been added to fit applications w i th various pow er supplies for the databus and pow er buses. ouputs t he output voltage pins (vl) ar e tied to the databus, address, or clock lines via an external inductor. output voltage is determined by the vccq or vin/2 inputs for cm8501 and is determined by the vccq only for cm8501a. inputs t he input voltage pins (vccq & vin/2 of cm8501 or vccq of cm8501a) determine the output voltages (vl). at cm8501, w hen the vin/2 pin is open, the output voltage is 50% of the vccq input. if a specific voltage is forced at the vin/2 pin, the output voltage follow s the voltage at the vin/2 pin. at cm8501a, the output voltage is alw a y s 50% of the vccq input. vccq is suggested to connect to vccq of memory module for better tracking w i th memory vccq. other supply voltages several inputs are provided fo r the supply voltages: pvdd and vcca t he pvdd provide the pow er s upply to the pow er mosf et s. vcca provide the voltage suppl y to the logic section and internal error amplifiers of cm8501/a. feedback t he vf b pin is an input that can be used for closed loop compensation. t h is input is derived from the voltage output. agsen pin is a contact node of internal resistor divider for remote sense (cm8501). 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 6
cm8501/a 1.5a b us t erminator suggested lay out gnd pad dimension : to guarantee providing continuous sinking or sourcing current up to 2a. psop-08 bottom gnd pad package 2.34 x 2.92 mm packag e bo tto m view lay out gnd pad package la nd pa tte rn comp side solder mask gnd pad package 2.4 x 3.0 mm so ld er mask co mp sid e 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 7
cm8501/a 1.5a b us t erminator package dimension 8-pin psop (ps08) 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 8
cm8501/a 1.5a b us t erminator package dimension 16-pin ptssop (pt16) 16-pin psop (ps16) 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 9
cm8501/a 1.5a b us t erminator important notice champion microelectronic corporation (cmc ) reserves the right to make changes to its products or to discontinue any integrated circuit product or servic e without notice, and advises its custom ers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. a few appli c a t ions u s in g in tegrate d ci rcuit prod uct s may in volve potential ri sks of death, p e rson al inju ry, or seve re pro perty or e n vironm ental damage. cmc integ r ate d circui t prod ucts a r e not desi gne d, intende d, autho rized, or wa rra nted to be suitabl e for use in life-s uppo rt appli c ations, device s or system s or other critic al application s . use of c m c pr oduc t s in s u ch applic ations is un ders t ood to b e fully at the r i sk of the c u s t omer . in o r der to minimiz e r i sks asso ciated with the cu stome r ?s ap plicatio ns, th e cu stom er sho u ld p r ovi de ad equ ate desi gn a n d operating safeguards. hsinchu headquarter sales & marketing 5f, no. 11, park avenue ii, science-based industrial park, hsinchu city, taiwan 300 11f, no. 306-3, sec. 1, ta tung rd., hsichih, taipei hsien, taiwan 221 t e l : + 8 8 6 - 3 - 5 6 7 9 9 7 9 t e l : +886-2-8692 1591 f a x : + 8 8 6 - 3 - 5 6 7 9 9 0 9 f a x : +886-2-8692 1596 http://www.champion-micro.com 2005/0 2 /02 re v . 1.2 champio n micro e lect roni c co rpo r ation page 10
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