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? 2004 california micro devices corp. all rights reserved. 08/16/04 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 1 cmpwr280 1.5a smartor tm dual regulator with v aux drive features ? selects from 3 input voltages and provides 3.3v output automatic selection of v cc , v sby or v aux drive control signal for external v aux switch glitch-free 3.3v output during supply transitions built-in hysteresis for supply selection v cc regulates up to 1.5a output current v sby regulates up to 375ma output current foldback current limiting thermal shutdown with hysteresis to-263 standard and thin-body packages lead-free versions avilable applications peripheral component interface (pci) adapter cards network interface cards (nics) multiple powered systems systems with standby capabilities product description the california micro devices? smartor tm cmpwr280 is a fully protected dual-input low-dropout cmos regulator that also provides the necessary con- trol signal for driving an external auxiliary p-channel mosfet switch. the smartor tm device automatically selects one of three possible inputs on a priority basis: v cc (1.5a), v sby (375ma) or v aux via the drive signal used to control an external switch. v cc is given first priority. in the event of the v cc supply being powered down, the device will automatically deselect the v cc prior to regulator dropout and imme- diately select v sby (second priority) as its power source. if neither v cc nor v sby are present the drive control output will turn-on an exte rnal p-channel mosfet switch from an auxiliary 3.3v supply v aux to v out . all the necessary control circuitry needed to provide a smooth and automatic transition between all three sup- plies has been incorporated. this allows v cc to be dynamically switched without loss of output voltage. the cmpwr280 is internally protected against output short-circuits, current overload and thermal overload. the cmpwr280 is housed in both a standard, 5-lead to-263 package or a thin-body, 5-lead to-263 pack- age and is available with optional lead-free finishing. simplified electrical schematic typical application circuit v out gnd v out cmpwr280 v cc 10 f 5v v cc c out + gnd 1 f + 3.3v v sby 5v 1 f + v sby drive v aux 3.3v fdn338p (si2310ds) 400ma 375ma 1.5a c in1 c in2 + v sby gnd v out - enable - controller s w a ux 3.3v 4.1v v deselect regulator amp v cc/sby v cc v ref cc sby 1.5a 375ma drive + +
? 2004 california micro devices corp. all rights reserved. 2 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 08/16/04 cmpwr280 pin descriptions pin(s) name description 1v sby .v sby is the standby 5v supply power source, which is only selected on when v cc < v ccdes . if vsby is selected, the regulator can deliver a maximum of 375ma load current. whenever v sby exceeds both v cc and v out , it will be used to provide all the internal bi as currents and any nece ssary regula tor current. 2v cc v cc is the primary 5v power supply for the internal regulator. whenever v cc exceeds v ccsel (4.5v), the internal regulator (up to 1500ma) will be enabled and deliver a fixed 3.3v at v out . when v cc falls below v ccdes (4.1v typically) the re gulator will be disabled. internal loading on this pin is typically 1.5ma when the regulator is enabled, which reduces to 0.2ma whenever the regulator is disabled. if v cc falls below either the v sby or v out voltage, the loading on v cc will reduce to only a few microamperes. during a v cc power up sequence, there will be an effective step increase in v cc line current when the regulator is enabled. the amplitude of this step increase w ill depend on the dc load current and any cur- rent required for charging/dischargi ng the load capacitance. this line current transient will cause a volt- age disturbance at the v cc pin proportional to the effective power supply source impedance being delivered to the v cc input. to prevent chatter during select and deselect transi tions, a built-in hysteresis voltage of 400mv has been incorporated. it is recommended that the power supply connected to the v cc input should have a source impedance of less than 0.15 ? to minimize the chatter during the enabling/disabling of the regula- tor. 3 gnd gnd is the negative reference for all voltages. the current that flows in the ground connection is very low (typically 2.0ma) and has minimal variation over all load conditions. 4v out v out is the regulator output voltage connection used to power the load. an output capacitor of ten microfarads is used to provide th e necessary phase compensation, ther eby preventing oscillation. the capacitor also helps to minimize the peak output disturbance during power supply changeover. when both v cc and v sby falls below v out , then v out will be used to provid e the necessar y quiescent current for the internal reference circuits. this ensures excellent start-up characteristics for the regulator. 5 drive drive is an active low logic output intended to be used as the control signal for driving an external p- channel mosfet switch whenever the regulator is disabled. this will allow the voltage at v out to be powered from an auxiliary supply voltage (3.3v). the drive pin is pulled high to v cc whenever the regulator is enabled, thus ensuring that the auxiliary supply remains isolated during normal regulator operation. package / pinout diagram note: these drawings are not to scale. 5-pin to-263 1 2 3 4 5 top view vsby v cc gnd v out drive cmpwr280to/tn 5-pin thin to-263 1 2 3 4 5 top view vsby v cc gnd v out drive CMPWR280TA/tb
? 2004 california micro devices corp. all rights reserved. 08/16/04 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 3 cmpwr280 ordering information note 1: parts are shipped in tape & reel form unless otherwise specified. specifications note 1: the maximum power dissipation of this device is internally limited by thermal shutdown circuitry. to achieve a power dis sipa- tion of 3.0 watts, a case-to-ambient thermal resistance of 25c/ w must be provided. this wi ll typically require dedicated heatsinking ability of the prin ted circuit board. for more details, please s ee the typical thermal characteristics section. part numbering information regulator pins package standard finish lead-free finish ordering part number 1 part marking ordering part number 1 part marking cmpwr280 5 to-263 cmpwr280to cmpwr280to cmpwr280tn cmpwr280tn cmpwr280 5 thin to-263 CMPWR280TA CMPWR280TA cmpwr280tb cmpwr280tb absolute maximum ratings parameter rating units esd protection (hbm) + 2000 v pin voltages v cc , v sby , v out , drive [gnd - 0.5] to [+6.0] [gnd - 0.5] to [v cc (v sby )+ 0.5] v v storage temperature range -40 to +150 c operating temperature range ambient junction 0 to +70 0 to +150 c c power dissipation (see note 1) to-263 thin to-263 internally limited internally limited w w standard operating conditions parameter rating units v cc, v sby input voltage 4.75 to 5.25 v ambient operating temperature range 0 to +70 c c ext 10 + 10% f
? 2004 california micro devices corp. all rights reserved. 4 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 08/16/04 cmpwr280 specifications (cont?d) note 1: operating characteristics are over standar d operating conditions unless otherwise specified. note 2: the hysteresis defines the maximu m level of acceptable disturbance on v cc during switching. it is recommended that the v cc source impedance be kept below 0.15 ? to ensure the switching disturbance remains below the hysteresis during select/ deselect transitions. note 3: ground pin current consists of controller current (0.2ma) and regulator current when selected. electrical operating characteristics (note 1) symbol parameter conditions min typ max units v out regulator output voltage 0ma < i load < 1500ma (v cc ) 0ma < i load < 375ma (v sby ) 3.135 3.300 3.465 v v ccsel select voltage v cc regulator enabled 4.50 4.70 v v ccdes v cc deselect voltage v cc regulator disabled 3.90 4.10 v v cchyst hysteresis voltage v cc hysteresis, see note 2 0.40 v i out regulator output current v cc selected v sby selected 1500 375 2500 750 ma ma i sc short-circuit output current v cc selected v sby selected 800 200 ma ma i rcc v cc pin reverse leakage v sby =5.0v; v cc = 0v x 10 100 a i rsby v sby pin reverse leakage v sby =0v; v cc = 5.0v x 10 100 a v r load v cc load regulation v cc selected, i load =15ma to 1500ma 30 mv v sby load regulation v sby selected, i load =5ma to 375ma 30 mv v r line line regulation v cc =4.5 to 5.5v, i load =5ma 5 mv i cc v cc supply current v cc selected, i out =0ma v ccdes > v cc > v aux or v out 1.5 0.1 3.0 0.2 ma ma i sby v sby supply current v sby selected, i out =0ma 1.5 3.0 ma i gnd ground pin current (note 3) regulator disabled (only v out present) regulator selected, i load =5ma regulator selected = 5v, i load =500ma 0.2 1.5 1.8 0.3 3.0 3.5 ma ma ma r oh r ol drive r ds high drive r ds low r ds to v cc , v cc > v ccsel r ds to gnd, v ccdes > v cc 5 0.5 10 1 k ? k ? t dh t dl drive high delay drive low delay c drive =1nf, v cc t rise < 100ns c drive =1nf, v cc t fall < 100ns x 5.0 0.5 s s t disable t hyst shutdown temperature thermal hysteresis 165 30 c c
? 2004 california micro devices corp. all rights reserved. 08/16/04 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 5 cmpwr280 typical dc characteristics unless stated otherwise, a ll dc characteristics were measured at room temperature with a nominal v cc supply voltage of 5.0 volts and an output capacitance of 10 f. v cc line regulation , as shown in figure 1 , is mea- sured while forcing the deselect threshold to an artifi- cial low level for loads of 100ma, 500ma and 1.5a. at the maximum rated load of 1.5a, a drop in line regula- tion occurs when the v cc supply voltage drops below 3.8v. for light load conditi ons (100ma), regulation is maintained as low as 3.2v. figure 1. v cc line regulation v cc load regulation (pulse condition) performance is shown up to and beyond the rated load. a change in load from 10% to 100% of rated current (150ma to 1500ma) results in an output voltage change of about 20mv. this translates into an effective output imped- ance of less than 15m ? . figure 2. v cc load regulation v sby load regulation (pulse condition) perfor- mance is shown up to and beyond the rated load. a change in load from 10% to 100% of rated (50ma to 500ma) results in an output voltage change of about 20mv. this translates into an effective output imped- ance of less than 50m ?. figure 3. v sby load regulation line regulation 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.3 3.6 3.9 4.2 4.5 4.8 v cc [v] v out [v] 100ma load 500ma load 1.5a load 3.24 3.26 3.28 3.30 3.32 3.34 3.36 0 500 1000 1500 load current [ma] v out [v] 3.24 3.26 3.28 3.30 3.32 3.34 3.36 0 100 200 300 400 500 load current [ma] v out [v]
? 2004 california micro devices corp. all rights reserved. 6 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 08/16/04 cmpwr280 typical dc characteristics (cont?d) ground current is shown across the entire range of load conditions in figure 4 . the ground current of 2ma has minimal variation across the range of load condi- tions and shows only a slight increase at maximum load. this slight increase at rated load is due to the current limit protection circuitry becoming active. figure 4. ground current v cc supply current of the device is shown across the entire v cc range in figure 5 . in the absence of v aux , the supply current remains fixed at approximately 0.15ma until v cc reaches the select voltage threshold of 4.35v. at this point the reg- ulator is enabled and a supply current of 1.0ma is con- ducted. when v aux is present, the v cc supply current is less than 10 a until v cc exceeds v aux , at which point v cc then powers the controller (0.15ma). when v cc reaches v select , the regulator is enabled. figure 5. v cc supply current (no load) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0 500 1000 1500 load current [ma] i gnd [ma] fig 1.5. vcc supply current (no load) 10 100 1000 10000 12345 vcc [v] i cc [a]
? 2004 california micro devices corp. all rights reserved. 08/16/04 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 7 cmpwr280 typical transient characteristics the transient characterization test set-up shown in figure 6 includes the effective source impedance of the v cc supply (r s ). this was measured to be approx- imately 0.1 ? . it is recommended that this effective source impedance be no greater than 0.15 ? to ensure precise switching is maintained during v cc selection and deselection. both the rise and fall times during v cc power-up/down sequencing were controlled at a 10 millisecond dura- tion. this is considered to represent worst case condi- tions for most application circuits. during a selection or deselection transition, the dc load current is switching from v aux to v cc and vice versa. in addition to the normal load current, there may also be an in-rush current for charging/discharging the load capacitor. the total current pulse being applied to either v aux or v cc is equal to the sum of the dc load and the corre- sponding in-rush current. tr ansient currents in excess of 1.0 amps can readily occur for brief intervals when either supply commences to power the load. figure 6. transient performance test set-up v cc load transient response is shown in figure 7 for a step load from 15ma to 1500ma. an overshoot of approximately 300mv is observed, before settling within 3 s. figure 7. v cc load transient response v sby load transient response is shown in figure 8 is shown for a step load from 5ma to 375ma. an over- shoot of approximately 100mv is observed, before set- tling within 1 s. figure 8. v sby load transient response
? 2004 california micro devices corp. all rights reserved. 8 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 08/16/04 cmpwr280 typical transient characteristics (cont?d) cold start and full power down modes figure 9. v cc cold start figure 10. v cc full power-down figure 11. v sby cold start figure 12. v sby full power down
? 2004 california micro devices corp. all rights reserved. 08/16/04 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 9 cmpwr280 typical transient characteristics (cont?d) vcc power changeover modes figure 13. v cc power up (v sby = 5v) figure 14. v cc power up (v aux = 3.3v) figure 15. v cc power up (v aux = 3.0v) figure 16. v cc power down (v sby = 5v) figure 17. v cc power down (v aux = 3.3v) figure 18. v cc power down (v aux = 3.0v)
? 2004 california micro devices corp. all rights reserved. 10 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 08/16/04 cmpwr280 typical thermal characteristics thermal dissipation of junction heat consists primarily of two paths in series. the first path is the junction to the case ( jc ) thermal resistance which is defined by the package style, and the second path is the case to ambient ( ca ) thermal resistance, which is dependent on board layout. the overall junction to ambient ( ja ) thermal resis- tance is equal to: ja = jc + ca for a given package style and board layout, the operat- ing junction temperature is a function of junction power dissipation p junc , and the ambient temperature, resulting in the follo wing thermal equation: t junc = t amb + p junc ( jc ) + p junc ( ca ) = t amb + p junc ( ja ) the cmpwr280to is housed in a to-263 5-lead package, which provides a jc of 3c/w. the ground tab is soldered down to the pcb. when the device is mounted on a double-sided printed circuit board with two square inches of copper allocated for ?heat spread- ing?, the resulting ja is 25c/w. based on a maximum power dissipation of 2.85w (1.9vx1.5a) with an ambient of 70c the resulting junc- tion temperature will be: t junc = t amb + p junc ( ja ) = 70c + 2.85w (25c/w) = 70c + 71c = 141c all thermal characteristics of the cmpwr280to were measured using a double-sided board with two square inches of copper area connected to the gnd pins for ?heat spreading?. measurements showing performance up to junction temperature of 125c were performed under light load conditions (5ma). this allows the ambient temperature to be representative of the internal junction tempera- ture. note: the use of multi-layer board construction with power planes will further enhance the thermal perfor- mance of the package. in the event of no copper area being dedicated for heat spreading, a multi-layer board construction will typically provide the cmpwr280to with an overall ja of 25c/w which allows up to 2.5w to be safely dissipated. output voltage vs. temperature. figure 19 shows the regulator v out performance up to the maximum rated junction temperature. the overall 125c variation in junction temperature causes an output voltage change of about 25mv. figure 19. output voltage vs. temperature output voltage (rated) vs. temperature. figure 20 shows the regulator steady state performance when fully loaded (1.5a ) in an ambient temperature up to the rated maximum of 70c. the output variation at maxi- mum load is approximately 13mv across the normal temperature range. figure 20. output voltage (rated) vs. temperature gpg p 3.260 3.280 3.300 3.320 3.340 0255075100125 junction temperature [ c] vout [v] 5ma load fig 3.2. output voltage (rated) vs. temperature 3.260 3.280 3.300 3.320 3.340 0 10203040506070 ambient temperature [ c] vout [v] 1.5a load
? 2004 california micro devices corp. all rights reserved. 08/16/04 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 11 cmpwr280 typical thermal characteristics (cont?d) thresholds vs. temperature. figure 21 shows the regulator select/deselect threshold variation up to the maximum rated junction temperature. the overall 125c change in junction temperature causes a 30mv variation in the select threshold voltage (regulator enable). the deselect threshold level varies about 30mv over the 125c change in junction temperature. this results in the built-in hysteresis having minimal variation over the entire operating junction temperature range. figure 21. threshold vs. temperature 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 -25 0 25 50 75 100 125 150 junction temperature [c] threshold [v] vselect vdeselect
? 2004 california micro devices corp. all rights reserved. 12 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 08/16/04 cmpwr280 mechanical details the cmpwr280 is available in either a standard 5- lead to-263 package or a thin-body, 5-lead to-263 package. the mechanical specifications for each of these packages are presented below. standard to-263-5 mechanical specifications dimensions for cmpwr280to devices packaged in 5- lead, standard to-263 packages are presented below. * this is an approximate amount which may vary. package dimensions for standard to-263-5. package dimensions package to-263 pins 5 dimensions millimeters inches min max min max a 4.34 4.60 0.171 0.181 b 0.74 0.89 0.029 0.035 c 0.33 0.43 0.013 0.017 d 8.92 9.17 0.351 0.361 e 10.16 10.67 0.400 0.420 e 1.70 ref 0.067 ref l 14.61 15.88 0.575 0.625 l1 2.29 2.79 0.090 0.110 l2 1.14 1.40 0.045 0.055 m 0.23 0.30 0.009 0.012 p 1.14 1.40 0.045 0.055 s 1.40 1.91 0.055 0.075 # per tube 50 pieces* # per tape and reel 750 pieces controlling dimension: inches mechanical package diagrams top view 5 4 e d l b a side view e p leadform 123 18-22 l2 s c 7 7 3 l1 m seating plane 0 -8 pin 1 marking
? 2004 california micro devices corp. all rights reserved. 08/16/04 430 n. mccarthy blvd., milpitas, ca 95035-5112 tel: 408.263.3214 fax: 408.263.7846 www.calmicro.com 13 cmpwr280 mechanical details (cont?d) thin to-263-5 mechanical specifications dimensions for CMPWR280TA devices packaged in 5- lead, thin-body to-263 packages are presented below. * this is an approximate amount which may vary. package dimensions for thin to-263-5. package dimensions package thin-body to-263 pins 5 dimensions millimeters inches min max min max a 1.270 1.524 0.050 0.060 b 0.635 0.889 0.025 0.035 c 0.228 0.330 0.009 0.013 d 8.890 9.400 0.350 0.370 e 9.779 10.29 0.385 0.405 e 1.709 ref 0.067 ref l 14.732 15.75 0.580 0.620 l1 2.286 2.794 0.090 0.110 l2 1.143 1.400 0.045 0.055 m .000 0.101 .000 .004 p 0.228 0.330 0.009 0.013 s ---- t 5.210 5.460 0.205 0.215 u 7.370 7.620 0.290 0.300 # per tube 50 pieces* # per tape and reel 750 pieces controlling dimension: inches mechanical package diagrams a side p leadform c 7 7 3 l1 m seating plane 0 -8 top view 5 4 e d l b e 123 18-22 l2 s pin 1 marking bottom t u view view

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