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250ma smartor tm regulator with v aux switch CMPWR101 ?2010 scillc. all rights reserved. publication order number: june 2010 rev. 3 CMPWR101/d features ? automatic detection of v cc input supply ? glitch-free output during supply transitions ? built-in hysteresis during supply selection ? 250ma output maximum load current ? fully integrated v aux switch ? overload current protection ? short circuit current protection ? operates from either v cc or v aux ? 8-pin soic package ? rohs compliant (lead-free) finishing applications ? pci adapter cards ? network interface cards (nics) ? dual power systems ? systems with standby capabilities product description the california micro devices? smartor tm CMPWR101 is a low dropout regulator that delivers up to 250ma of load current at a fixed 3.3v output. an internal threshold level (typically 4.1v) is used to prevent the regulator from being operated below dropout vo ltage. the device continuously monitors the input supply and will automatically disable the regulator when v cc falls below the threshold level. when the regulator is disabled, a low impedance, fully integr ated switch is enabled which allows the output to be directly powered from an auxiliary 3.3v supply. when v cc is restored to a level above the select thres hold, the low impedance switch is disabled and the regulator is once again enabled. all the necessary control circuitry needed to prov ide a smooth and automatic transition between the supplies has been incorporated. this allows v cc to be dynamically switched without loss of output voltage. an output logic signal, drive, is active low whenever the internal regulator is disabled. the CMPWR101 is housed in a 8-pin soic package and is available with rohs compliant lead-free finishing.
CMPWR101 rev. 3 | page 2 of 12 | www.onsemi.com simplified electrical schematic typical application circuit pin descriptions pin(s) name description 1 v cc v cc is the power source for the internal regulator and is monitored continuously by an internal controller circuit. whenever v cc exceeds v ccsel (4.25v typically), the internal regulator will be enabled and deliver a fixed 3.3v at v out . when v cc falls below v ccdes (4.10v typically), the regul ator will be disabled. inter nal loading on this pin is typically 0.6ma when the regulator is enabled, whic h reduces to 0.1ma whenever the regulator is disabled. if v cc falls below the voltage on the v aux pin, the v cc loading will further reduce to only a few microamperes. during a v cc power-up or power-down sequence, t here will be an effective step increase in v cc line current when the regulator is enabled/disabled. this line current transient will cause a voltage disturbance at the v cc pin. the magnitude of the disturbance will be directly proportional to the effective power supply source impedance being delivered to the v cc input. a built-in hysteresis voltage of 150mv has been inco rporated to minimize any chatter during supply changeover. it is recommended that t he power supply connected to the v cc input should have a source resistance of less than 0.25 to minimize the event of chatte r during the enabling/disabling of the regulator. if the v cc pin is within a few inches of the main input filter, a capacitor may not be necessary. otherwise an input filter capacitor in the ra nge of 1f to 10f will help to lower the effective source impedance. 2 - 3 v aux v aux is the auxiliary power source. when selected, (v cc < v ccdes ), the auxiliary supply is directly connected to v out , via the low impedance (0.3 typically) fully integrated switch. the internal loading on this pin is typically less than 10a and will increase to 100a if v cc falls below the voltage on v aux . when v aux = 0v, the v ccdes voltage is inhibited which prevents the regulator from being disabled. 4 gnd gnd is the negative reference for all voltages. the cu rrent that flows in the ground connection is very low (typically 0.6ma) and has minima l variation over all load conditions. 5 nc nc is an unconnected pin which is electrical ly isolated from the internal circuitry 6 - 7 v out v out is the regulator output voltage connection used to pow er the load. an output capacitor of 4.7f is used to provide the necessary phase compensation, t hereby preventing oscillati on. the capacitor also helps to minimize the peak output disturbance during power supply changeover. 8 drive drive is a cmos output logic signal (active low) referenced to the v cc supply. this output is taken low whenever the internal regulator is not enabled. this output is intended only as a control signal for external circuitry.
CMPWR101 rev. 3 | page 3 of 12 | www.onsemi.com 8-pin soic 1 2 3 4 8 7 6 5 v cc v aux v aux gnd drive v out v out nc ordering information part numbering information pins package ordering part number 1 part marking 8 power soic CMPWR101r cmpwr 101r note 1: parts are shipped in tape & reel form unless otherwise specified. specifications absolute maximum ratings parameter rating units esd protection (hbm) + 2000 v pin input voltages v cc v aux drive [gnd - 0.5] to +6.0 [gnd - 0.5] to +4.0 [gnd - 0.5] to [v cc + 0.5] v v storage temperature range -40 to +150 c operating temperature range ambient junction 0 to +70 0 to +125 c c power dissipation (see note 1) 0.5 w note 1: the power rating is based on a printed circuit board heat spreading capability equivalent to 2 square inches of copper connected to the gnd pins. typical multi-layer boards using power plane construction will provide this heat spreading ability without the need for additional dedicat ed copper area. (please consult with factory for thermal evaluation assistance).
CMPWR101 rev. 3 | page 4 of 12 | www.onsemi.com standard operating conditions parameter value units v cc 5.0 + 0.5 v v aux 3.3 + 0.3 v ambient operating temperature range 0 to +70 c load current 0 to 250 ma c ext 4.7 + 20% f
CMPWR101 rev. 3 | page 5 of 12 | www.onsemi.com electrical operating characteristics (see note 1) symbol parameter conditions min typ max units v out regulator output voltage 0ma < i load < 250ma 3.135 3.300 3.465 v i lim regulator current limit 275 ma v ccsel v cc select voltage regulator enabled 4.30 4.45 v v ccdes v cc deselect voltage regulator disabled 3.90 4.10 v v cchyst hysteresis voltage see note 2 0.20 v v r load load regulation v cc =5v, 5ma < i load < 250ma 20 mv v r line line regulation xx i load = 5ma; 4.5v < v cc < to 5.5v 2 mv r sw v aux switch resistance v ccdes > v cc , v aux = 3.3v 0.25 0.40 i rcc v cc reverse leakage v aux = 3.3v, v cc = 0v 2 50 a i raux v aux reverse leakage v aux = 0v, v cc = 5v 2 50 a i gnd ground current v cc < v ccdes , i load = 0ma v cc > v ccsel , i load = 0ma v cc > v ccsel , i load = 250ma 0.20 0.60 0.70 0.40 1.00 1.20 ma ma ma i aux v aux supply current v aux > v cc v cc > v aux 0.20 0.02 0.40 0.10 ma ma r oh drive pull-up resistance r pullup to v cc , v cc > v ccsel 4.0 8.0 k r ol drive pull-down resistance r pulldown to gnd, v ccdes > v cc 0.1 0.4 k note 1: operating characteristics are over standard oper ating conditions unless otherwise specified. note 2: the hysteresis defines the maximum level of acceptable disturbance on v cc during switching. it is recommended that the v cc source impedance be kept below 0.25 to ensure the switching disturbance remains below the hysteresis during select/deselect trans itions. an input capacitor may be requi red to help minimize the switching transient.
CMPWR101 rev. 3 | page 6 of 12 | www.onsemi.com performance information CMPWR101 typical dc characteristics (nom inal conditions unless specified otherwise)
CMPWR101 rev. 3 | page 7 of 12 | www.onsemi.com
CMPWR101 rev. 3 | page 8 of 12 | www.onsemi.com performance information (cont?d) CMPWR101 transient characteristics (nomin al conditions unless specified otherwise) (v cc source resistance set to 0.2 )
CMPWR101 rev. 3 | page 9 of 12 | www.onsemi.com performance information (cont?d) CMPWR101 typical thermal characteristics the overall junction to ambient thermal resistance ( ja ) for device power dissipation (p d ) consists primarily of two paths in series. the first path is the junction to the case ( jc ) which is defined by the package style, and the second path is case to ambient ( ca ) thermal resistance which is dependent on board layout. the final operating junction temperature for any set of conditions can be estimated by the following thermal equation: t junc = t amb + p d ( jc ) + p d ( ca ) = t amb + p d ( ja ) the CMPWR101 uses a standard soic package. wh en this package is mounted on a double-sided printed circuit board with two square inches of copper allocated for "heat spreading", the resulting ja is 85c/w. based on a maximum power dissipation of 0.43w (1.7 v x 250ma) with an ambient of 70c, the resulting junction temperature will be: t junc = t amb + p d ( ja ) = 70c + 0.43w (80c/w) = 70c + 37c = 103c thermal characteristics were measured using a double- sided board with two square inches of copper area connected to the gnd pin for "heat spreading". measurements showing performance up to junction temperature of 125c were performed under light load conditions (5ma). this allows the ambient temperat ure to be representative of the internal junction temperature. note: the use of multi-layer board construction wi th separate ground and power planes will further enhance the overall thermal performance. in the event of no copper area being dedicated for heat spreading, a multi-layer board construction, using onl y the minimum size pad layout, will provide the CMPWR101 with an overall ja of 100c/w which allows up to 500mw to be safely dissipated.
CMPWR101 rev. 3 | page 10 of 12 | www.onsemi.com
CMPWR101 rev. 3 | page 11 of 12 | www.onsemi.com mechanical details soic-8 mechanical specifications dimensions for CMPWR101 devices packaged in 8-pin soic packages are presented below. for complete information on the soic-8 package, see the california micro devices soic package information document. package dimensions package soic pins 8 millimeters inches dimensions min max min max a 1.35 1.75 0.053 0.069 a 1 0.10 0.25 0.004 0.010 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.007 0.010 d 4.80 5.00 0.189 0.197 e 3.80 4.19 0.150 0.165 e 1.27 bsc 0.050 bsc h 5.80 6.20 0.228 0.244 l 0.40 1.27 0.016 0.050 # per tube 100 pieces* # per tape and reel 2500 pieces controlling dimension: inches * this is an approximate number which may vary. package dimensions for soic-8
CMPWR101 rev. 3 | page 12 of 12 | www.onsemi.com on semiconductor and are registered trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes witho ut further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any parti cular purpose, nor does scillc assume any liability arising out of the application or use of any pr oduct or circuit, and specific ally disclaims any and all liability, including without li mitation special, consequential or incidental damages. ?typical? parameters which may be provided in scillc data sheets and/or spec ifications can and do vary in different applications and actu al performance may vary over time. all operating parameters, including ?typicals? must be validated for each custom er application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not de signed, intended, or authorized for use as components in systems intended for surg ical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a situation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers , employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reason able attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 303-675-2175 or 800-344-3860 toll free usa/canada fax : 303-675-2176 or 800-344-3867 toll free usa/canada email : orderlit@onsemi.com n. american technical support : 800-282-9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81-3-5773-3850 on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative

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