CM8501C 1.5a b us t erminator 2002/09/30 rev. 1.0 champion microelectronic corporation page 1 general description features patent filed #6,452,366 8-pin sop packages source and sink up to 1.5a, no heat sink required peak current to 3a integrated power mosfets output voltage can be programmed by external resistors separate voltages for vccq and pvdd v out of 3% or less at 1.5a minimum external components shutdown for standby or suspend mode operation thermal shutdown protection soft start the CM8501C is a low cost switching regulator designed to provide a desired output voltage or termination voltage for various applications by converting voltage supplies ranging from 2.0v to 4.5v. the CM8501C can be implemented to produce regulated output voltages in two different modes. in the default mode, when the vin/2 pin is open, the output voltage is 50% of the vccq. the CM8501C 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 follows the vin/2 pin input voltage. the regulated output voltage of CM8501C is internally set to be 50% of the applied vccq. the switching regulator is capable of sourcing or sinking up to 1.5a of current while regulating an output v tt voltage to within 3% or less. the CM8501C provides low profile 8-pin psop package to save system space. 24 hours technical support---websim champion provides customers an online circuit simulation tool called websim. you could simply logon our website at www.champion-micro.com for details. applications mother board pci/agp graphics game/ play station set top box ipc scsi-iii bus terminator buck converter pin configuration sop-8 (s08) top view 1 2 3 4 8 7 6 5 vcca vccq agnd sd pvdd vl pgnd vfb
CM8501C 1.5a b us t erminator 2002/09/30 rev. 1.0 champion microelectronic corporation page 2 pin description operating rating pin no. symbol description min. typ. max. unit 1 vcca voltage supply for internal circuits 2.0 4.5 v 3 agnd ground for internal reference voltage divider 4 sd shutdown active high. cmos input level 0.75 x vcca vcca + 0.3v v 2 vccq voltage reference for external voltage divider 2.5 v 5 vfb feedback node for the v tt vccq/2 v 6 pgnd ground for output power transistors 7 vl output voltage/inductor connection (idd1+idd2, output rms current) -1.5 +1.5 a 8 pvdd voltage supply for output power transistors 2.0 4.5 v ordering information part number temperature range package CM8501Cis -40 to 85 8-pin sop (s08) block diagram
CM8501C 1.5a b us t erminator 2002/09/30 rev. 1.0 champion microelectronic corporation page 3 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 absolute maximum ratings junction temperature ...???????? ????150c absolute maximum ratings are those values beyond which the device could be permanently damaged. storage temperature ??................??. -65c to 125c pvdd/vcca/vccq ......................................?.......-0.3v to 4.5v lead temperature (soldering, 5 sec)??????.. 300c voltage on any other pin ???... gnd ? 0.3v to vcc + 0.3v thermal resistance ? ( ja )?.. ??????.. .100c/w output rms current, source or sink .....????........?...1.5a operating conditions temperature range ............................. -40c to 85c p vdd operating range .........................2.0v to 4.5v
CM8501C 1.5a b us t erminator 2002/09/30 rev. 1.0 champion microelectronic corporation page 4 electrical characteristics (unless otherwise stated, these specifications apply t a =25 c ; vcca=+3.3v and pvdd=+3.3v) maximum ratings are stress ratings only and functional device operation is not implied. (note 1) CM8501C symbol parameter test conditions min. typ. max. unit switching regulator 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, sstl_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 note 2 vccq = 0 50 k fsw switching frequency CM8501C 1.2 mhz i out(rms) minimum output rms current CM8501C 1.5 2.0 a i out(peak) maximum output peak current CM8501C 3 a ots over temperature shutdown CM8501C 135 150 mosfets rds (on) drain to source on-state resistance pvdd=5v 250 m supply i vcca quiescent current vfb = 1.4v lc unconnected 220 a i pvdd vfb = 1.4v lc unconnected 500 a note 1: limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions note 2: vcca, pvdd = 3.3v 10% note 3: guaranteed by design, not 100% test
CM8501C 1.5a b us t erminator 2002/09/30 rev. 1.0 champion microelectronic corporation page 5 functional description the CM8501C is a switching regulator that is capable of sinking and sourcing 1.5a of current without an external heat sink. the CM8501C integrates power mosfets that are capable of source and sink 1.5a of current while maintaining excellent voltage regulation. the output voltage can be regulated within 3% or less by using the external feedback. separate voltage supply inputs have been added to fit applications with various power supplies for the databus and power buses. ouputs the output voltage pins (vl) are tied to the databus, address, or clock lines via an external inductor. output voltage is determined by the vccq and is determined by the vccq. inputs the input voltage pins (vccq) determine the output voltages (vl). at CM8501C, the output voltage is always 50% of the vccq input. vccq is suggested to connect to vccq of memory module for better tracking with memory vccq. other supply voltages several inputs are provided for the supply voltages: pvdd and vcca the pvdd provide the power supply to the power mosfets. vcca provide the voltage supply to the logic section and internal error amplifiers of CM8501C. feedback the vfb pin is an input that can be used for closed loop compensation. this input is derived from the voltage output. agsen pin is a contact node of internal resistor divider for remote sense. package dimension 8-pin sop (s08) pin 1 id
CM8501C 1.5a b us t erminator 2002/09/30 rev. 1.0 champion microelectronic corporation page 6 important notice champion microelectronic corporation (cmc) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. a few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or environmental damage. cmc integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. use of cmc products in such applications is understood to be fully at the risk of the customer. in order to minimize risks associated with the customer?s applications, the customer should provide adequate design and 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 : +886-3-567 9979 t e l : +886-2-8692 1591 f a x : +886-3-567 9909 f a x : +886-2-8692 1596 http://www.champion-micro.com
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