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slus317b ? january 2000 ? revised february 2004 1 post office box 655303 ? dallas, texas 75265 fast transient response 10-ma to 3-a load current short circuit protection maximum dropout of 450-mv at 3-a load current separate bias and vin pins available in adjustable or fixed-output voltages 5-pin package allows kelvin sensing of load voltage reverse current protection description the uc382 is a low-dropout-linear regulator providing a quick response to fast load changes. combined with its precision onboard reference, the uc382 excels at driving gtl and btl buses. due to its fast response to load transients, the total capacitance required to decouple the regulator?s output can be significantly decreased when compared to standard ldo linear regulators. dropout voltage (vin to vout) is only 450 mv maximum at 100 c and 350 mv typical at 3-a load. the onboard bandgap reference is stable with temperature and scaled for a 1.2-v input to the internal-power amplifier. the uc382 is available in fixed-output voltages of 1.5 v, 2.1 v, or 2.5 v. the output voltage of the adjustable version can be set with two external resistors. if the external resistors are omitted, the output voltage defaults to 1.2 v. block diagram + thermal shutdown 1.2 v bandgap reference r2 r1 3 5 short circuit sense 2 1 4 uc382?adj uc382?1 (1.5 v) uc382?2 (2.1 v) uc382?3 (2.5 v) open 0 2 k 500 ? 2 k 1.5 k ? 2 k 2.16 k ? r1 r2 adj gnd vout vin vb udg-00080 copyright ? 2000?2004, t exas instruments incorporated please be aware that an important notice concerning avail ability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 5-pin to-263 td package (top view) 5-pin to-220 t package (top view) note: tab = ground all trademarks are the property of their respective owners.
slus317b ? january 2000 ? revised february 2004 2 post office box 655303 ? dallas, texas 75265 absolute maximum ratings over operating free-air temperature (unless otherwise noted) ? vb 13 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vin 7.5 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output voltage 1.2 v to 6.0 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature, t stg ?65 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . junction temperature, t j ?55 c to 150 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . lead temperature (soldering, 10 seconds) 300 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ? stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, a nd functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditi ons? is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. currents are positive into, negative out of the specified terminal. consult packaging section of databook for thermal limitatio ns and considerations of packages. available options (1) packaged devices t j to-220 (t) to?263 (td) (2) t j output voltage output voltage 1.5 v 2.1 v 2.5 v 1.2 v or adj 1.5 v 2.1 v 2.5 v 1.2 v or adj ?40 c to 100 c 282t-1 282t-2 282t-3 282t-adj 282td-1 282td-2 282td-3 282td-adj 0 c to 100 c 382t-1 382t-2 382t-3 382t-adj 382td-1 382td-2 382td-3 382td-adj 1. for more package and ordering information, see the package option addendum located at the end of this data sheet. 2. for 50 piece reel, add kttt (e.g., uc282tdkttt?1); for 500 piece reel, add tr (e.g., uc282tdtr?1). electrical characteristics, t a = ?40 c to 100 c for the uc282-x series and 0 c to 100 c for the uc382-x, vb = 5 v, vin = 3.3 v, vout = 2.5 v for the uc382-adj, t a = t j , (unless otherwise stated) uc382-3 fixed 2.5 v, 3-a family parameters test conditions min typ max units output voltage (i vout = 100 ma) uc382-3 2.475 2.500 2.525 v output voltage (i vout = 100 ma) uc282-3 2.450 2.500 2.525 v load regulation i vout = 10 ma to 3 a 0.5 4 mv vin pssr 80 100 db vb pssr 50 60 db i vout = 3 a, t j = 25 c 350 425 mv vin dropout voltage = vin?vout i vout = 3 a, uc382-3 350 450 mv vin dropout voltage = vin?vout i vout = 3 a, uc282-3 350 500 mv vb dropout = vb?vout i vout = 3 a, uc382-3 1.8 2.10 v vb dropout = vb?vout i vout = 3 a, uc282-3 1.8 2.20 v short circuit current limit 3.3 4.5 a vb current i vout = 10 ma 6 11 ma vb current i vout = 3 a 18 60 ma vin current i vout = 3 a 2.94 2.97 a
slus317b ? january 2000 ? revised february 2004 3 post office box 655303 ? dallas, texas 75265 electrical characteristics, t a = ?40 c to 100 c for the uc282-x series and 0 c to 100 c for the uc382-x, vb = 5 v, vin = 3.3 v, vout = 2.5 v for the uc382-adj, t a = t j , (unless otherwise stated) uc382-2 fixed 2.1 v, 3-a family parameters test conditions min typ max units output voltage (i vout = 100 ma) uc382-2 2.079 2.100 2.121 v output voltage (i vout = 100 ma) uc282-2 2.058 2.100 2.121 v load regulation i vout = 10 ma to 3 a 0.5 4 mv vin pssr 80 100 db vb pssr 52 62 db i vout = 3 a, t j = 25 c 350 425 mv vin dropout voltage = vin?vout i vout = 3 a, uc382-2 350 450 mv vin dropout voltage = vin?vout i vout = 3 a, uc282-2 350 500 mv vb dropout = vb?vout i vout = 3 a, uc382-2 1.8 2.10 v vb dropout = vb?vout i vout = 3 a, uc282-2 1.8 2.20 v short circuit current limit 3.3 4.5 a vb current i vout = 10 ma 6 11 ma vb current i vout = 3 a 18 60 ma vin current i vout = 3 a 2.94 2.97 a uc382-1 fixed 1.5 v, 3-a family parameters test conditions min typ max units output voltage (i vout = 100 ma) uc382-1 1.485 1.500 1.515 v output voltage (i vout = 100 ma) uc282-1 1.470 1.500 1.515 v load regulation i vout = 10 ma to 3 a 0.5 4 mv vin pssr 80 100 db vb pssr 55 65 db i vout = 3 a, t j = 25 c 350 425 mv vin dropout voltage = vin?vout i vout = 3 a, uc382-1 350 450 mv vin dropout voltage = vin?vout i vout = 3 a, uc282-1 350 500 mv vb dropout = vb?vout i vout = 3 a, uc382-1 1.8 2.10 v vb dropout = vb?vout i vout = 3 a, uc282-1 1.8 2.20 v short circuit current limit 3.3 4.5 a vb current i vout = 10 ma 6 11 ma vb current i vout = 3 a 18 60 ma vin current i vout = 3 a 2.94 2.97 a
slus317b ? january 2000 ? revised february 2004 4 post office box 655303 ? dallas, texas 75265 electrical characteristics, t a = ?40 c to 100 c for the uc282-x series and 0 c to 100 c for the uc382-x, vb = 5 v, vin = 3.3 v, vout = 2.5 v for the uc382-adj, t a = t j , (unless otherwise stated) uc382-adj adjustable, 3-a family parameters test conditions min typ max units adj voltage (i vout = 100 ma) uc382-adj 1.188 1.200 1.212 v adj voltage (i vout = 100 ma) uc282-adj 1.176 1.200 1.212 v load regulation i vout = 10 ma to 3 a 0.5 4 mv vin pssr vout programmed for 2.5 v 80 100 db vb pssr vout programmed for 2.5 v 50 60 db i vout = 3 a, t j = 25 c 350 425 mv vin dropout voltage = vin?vout i vout = 3 a, uc382-adj 350 450 mv vin dropout voltage = vin?vout i vout = 3 a, uc282-adj 350 500 mv vb dropout = vb?vout i vout = 3 a, uc382-adj 1.8 2.10 v vb dropout = vb?vout i vout = 3 a, uc282-adj 1.8 2.20 v short circuit current limit 3.3 4.5 a vb current i vout = 10 ma 6 11 ma vb current i vout = 3 a 18 60 ma vin current i vout = 3 a 2.94 2.97 a pin descriptions adj: in the adjustable version, the user programs the output voltage with two external resistors. the resistors should be 0.1% for high accuracy. the output amplifier is configured as a non-inverting-operational amplifier. the resistors should meet the criteria of r3 || r4 < 100 ? . connect adj to vout for an output voltage of 1.2 v. note that the point at which the feedback network is connected to the output is the kelvin sense point. for -1, -2, and -3 versions, adj pin is tied to vout to obtain specified output voltage. gnd: for accurate results, the gnd pin should be referenced to the load ground. vb: supplies power to all circuits of the regulator except the collector of the output-power transistor. the 2-v headroom from vb to vout allows the use of a darlington output stage for inherently-low-output impedance and fast response. (dropout is derated for junction temperatures below 0 c.) vin: supplies the current to the collector of the output-power transistor only. the dropout (vin?vout) is under 100 mv for light loads; maximum dropout is 450 mv at 3 a for t j = 0 c to 100 c. (dropout is derated for junction temperatures over 100 c.) at full load, the majority of the vb current is going to the load. vout: this pin should be connected to the load via a low impedance path. avoid connectors which add significant inductance and resistance. note that even though a kelvin sense is available through a 5-pin package, care must be taken since voltage drops along wire traces add to the dropout voltage.
slus317b ? january 2000 ? revised february 2004 5 post office box 655303 ? dallas, texas 75265 pin descriptions (continued) figure 1 dropout voltage (v b ? v out ) vs load current 3 i l ? load current ? a 2 1 0 1.7 1.8 1.9 1.6 v do - dropout voltage - v t j = 27 c figure 2 dropout voltage (v in ? v out ) vs load current 3 a 2 a 1 a 100 ma 100 200 300 400 i l - load current - a v do - dropout voltage - mv t j = 27 c application information the uc382 is easy to use. the adjustable version requires two 0.1% resistors to set the output voltage. the fixed versions of the uc382 require no external resistors. all versions of the uc382 require decoupling capacitors on the input and output. in a typical application, vb and vin are driven from switching power supplies which may have large filter capacitors at their outputs. if the uc382 is further than 12 inches from the power supply, it is recommended to add local decoupling as close as possible to the linear regulator. decouple the output of the uc382 with at least 100 f of high-quality tantalum or sanyo oscon capacitors close to the vout pin for maximum stability. many applications involving ultra-fast gtl or btl applications require additional capacitance close to the load. the exact amount will vary according to speed and magnitude of the load transients and the tolerance allowed for transients on vout. when specifying the decoupling capacitors, the series resistance of the capacitor bank is an important factor in its ability to filter load transients. the uc382 allows for kelvin sensing the voltage at the load. this improves regulation performance and eliminates the voltage drops due to wire-trace resistance. this voltage drop must be added to the headroom (vin to vout and vb to vout). the dropout of 450 mv is measured at the pins and does not include additional drops due to trace resistance. the minimum load current is 10 ma. two or more uc382?s may be used in parallel. while stable, this arrangement does degrade the transient response.
slus317b ? january 2000 ? revised february 2004 6 post office box 655303 ? dallas, texas 75265 figure 3 open loop gain vs frequency 10 m 1 m 100 k 10 k 1 k 100 ?10 0 10 20 30 40 50 60 70 f ? frequency ? hz gain - db figure 4 open loop phase vs frequency 10 m 1 m 100 k 10 k 1 k 100 ?180 ?90 0 f ? frequency ? hz phase - deg figure 5 power supply rejection ratio (vb input) vs frequency 10 m 1 m 100 k 10 k 1 k 100 0 10 20 30 40 50 60 f ? frequency ? hz psrr - power supply rejection ratio (vb i nput) ? db
slus317b ? january 2000 ? revised february 2004 7 post office box 655303 ? dallas, texas 75265 application information udg-00081 4 5 1 2 3 adj vout vb vin gnd 4.7 f tant 3.3 v 1 f cer 5 v 100 f tant 121 ? r1 ? uc382?adj pulse generator v o = 1.2 v irf 520 + + figure 6. transient test circuit figure 7 10 ma to 3 a/ s load transient response ?
slus317b ? january 2000 ? revised february 2004 8 post office box 655303 ? dallas, texas 75265 application information udg-00082 4 5 1 2 3 adj vout vb vin gnd 4.7 f tant +3.3 v 4.7 f cer +5 v 330 f oscon uc382?adj kelvin sense point 2.2 f cer r3 60 ? r4 120 ? +1.8 v output + ++ figure 8. typical uc382-adj application udg-00083 4 5 1 2 3 adj vout vb vin gnd 4.7 f +5 v 330 f oscon uc382?1 kelvin sense point 2.2 f cer +1.5 v output + + figure 9. typical uc382-1, -2, or -3 application
packaging information orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) uc282t-1 active to-220 kc 5 50 none cu sn level-na-na-na uc282t-2 active to-220 kc 5 50 none cu sn level-na-na-na uc282t-3 active to-220 kc 5 50 none cu sn level-na-na-na uc282t-adj active to-220 kc 5 1000 none cu sn level-na-na-na uc282td-1 obsolete ddpak/ to-263 ktt 5 none call ti call ti uc282td-2 obsolete ddpak/ to-263 ktt 5 none call ti call ti uc282td-3 obsolete ddpak/ to-263 ktt 5 none call ti call ti uc282td-adj obsolete ddpak/ to-263 ktt 5 none call ti call ti uc282tdkttt-1 active ddpak/ to-263 ktt 5 50 none cu sn level-2-220c-1 year uc282tdkttt-2 active ddpak/ to-263 ktt 5 50 none cu sn level-2-220c-1 year uc282tdkttt-3 active ddpak/ to-263 ktt 5 50 none cu sn level-2-220c-1 year uc282tdkttt-adj active ddpak/ to-263 ktt 5 50 none cu sn level-2-220c-1 year uc282tdtr-1 active ddpak/ to-263 ktt 5 500 none cu sn level-2-220c-1 year uc282tdtr-2 active ddpak/ to-263 ktt 5 500 none cu sn level-2-220c-1 year uc282tdtr-3 active ddpak/ to-263 ktt 5 500 none cu sn level-2-220c-1 year uc282tdtr-adj active ddpak/ to-263 ktt 5 500 none cu sn level-2-220c-1 year uc382t-1 active to-220 kc 5 50 none cu sn level-na-na-na uc382t-2 active to-220 kc 5 50 none cu sn level-na-na-na uc382t-3 active to-220 kc 5 50 none cu sn level-na-na-na uc382t-adj active to-220 kc 5 50 none cu sn level-na-na-na uc382td-1 obsolete ddpak/ to-263 ktt 5 none call ti call ti uc382td-2 obsolete ddpak/ to-263 ktt 5 none call ti call ti uc382td-3 obsolete ddpak/ to-263 ktt 5 none call ti call ti uc382td-adj obsolete ddpak/ to-263 ktt 5 none call ti call ti uc382tdkttt-1 active ddpak/ to-263 ktt 5 50 none cu sn level-2-220c-1 year uc382tdkttt-2 active ddpak/ to-263 ktt 5 50 none cu sn level-2-220c-1 year uc382tdkttt-3 active ddpak/ to-263 ktt 5 50 none cu sn level-2-220c-1 year uc382tdkttt-adj active ddpak/ to-263 ktt 5 50 none cu sn level-2-220c-1 year package option addendum www.ti.com 9-dec-2004 addendum-page 1
orderable device status (1) package type package drawing pins package qty eco plan (2) lead/ball finish msl peak temp (3) uc382tdtr-1 active ddpak/ to-263 ktt 5 500 none cu sn level-2-220c-1 year UC382TDTR-2 active ddpak/ to-263 ktt 5 500 none cu sn level-2-220c-1 year uc382tdtr-3 active ddpak/ to-263 ktt 5 500 none cu sn level-2-220c-1 year uc382tdtr-adj active ddpak/ to-263 ktt 5 500 none cu sn level-2-220c-1 year (1) the marketing status values are defined as follows: active: product device recommended for new designs. lifebuy: ti has announced that the device will be discontinued, and a lifetime-buy period is in effect. nrnd: not recommended for new designs. device is in production to support existing customers, but ti does not recommend using this part in a new design. preview: device has been announced but is not in production. samples may or may not be available. obsolete: ti has discontinued the production of the device. (2) eco plan - may not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. none: not yet available lead (pb-free). pb-free (rohs): ti's terms "lead-free" or "pb-free" mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, ti pb-free products are suitable for use in specified lead-free processes. green (rohs & no sb/br): ti defines "green" to mean "pb-free" and in addition, uses package materials that do not contain halogens, including bromine (br) or antimony (sb) above 0.1% of total product weight. (3) msl, peak temp. -- the moisture sensitivity level rating according to the jedecindustry standard classifications, and peak solder temperature. important information and disclaimer: the information provided on this page represents ti's knowledge and belief as of the date that it is provided. ti bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. ti has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. ti and ti suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. in no event shall ti's liability arising out of such information exceed the total purchase price of the ti part(s) at issue in this document sold by ti to customer on an annual basis. package option addendum www.ti.com 9-dec-2004 addendum-page 2

mechanical data msot008b january 1995 revised september 2000 1 post office box 655303 ? dallas, texas 75265 kc (r-psfm-t5) plastic flange-mount 4040208/e 09/00 0.420 (10,67) 0.185 (4,70) 0.055 (1,40) 0.147 (3,73) 0.340 (8,64) 1.037 (26,34) 0.040 (1,02) 0.030 (0,76) 0.997 (25,32) 0.380 (9,65) 0.330 (8,38) 0.137 (3,48) 0.045 (1,14) 0.175 (4,46) 0.113 (2,87) 0.122 (3,10) 0.025 (0,64) 0.102 (2,59) 0.012 (0,30) 0.103 (2,62) 0.146 (3,71) 0.156 (3,96) dia (see note c) 0.125 (3,18) 0.067 (1,70) 0.268 (6,81) 5 1 m 0.010 (0,25) notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. lead dimensions are not controlled within this area. d. all lead dimensions apply before solder dip. e. the center lead is in electrical contact with the mounting tab.
important notice texas instruments incorporated and its subsidiaries (ti) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. all products are sold subject to ti?s terms and conditions of sale supplied at the time of order acknowledgment. ti warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with ti?s standard warranty. testing and other quality control techniques are used to the extent ti deems necessary to support this warranty. except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. ti assumes no liability for applications assistance or customer product design. customers are responsible for their products and applications using ti components. to minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. ti does not warrant or represent that any license, either express or implied, is granted under any ti patent right, copyright, mask work right, or other ti intellectual property right relating to any combination, machine, or process in which ti products or services are used. information published by ti regarding third-party products or services does not constitute a license from ti to use such products or services or a warranty or endorsement thereof. use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from ti under the patents or other intellectual property of ti. reproduction of information in ti data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. reproduction of this information with alteration is an unfair and deceptive business practice. ti is not responsible or liable for such altered documentation. resale of ti products or services with statements different from or beyond the parameters stated by ti for that product or service voids all express and any implied warranties for the associated ti product or service and is an unfair and deceptive business practice. ti is not responsible or liable for any such statements. following are urls where you can obtain information on other texas instruments products and application solutions: products applications amplifiers amplifier.ti.com audio www.ti.com/audio data converters dataconverter.ti.com automotive www.ti.com/automotive dsp dsp.ti.com broadband www.ti.com/broadband interface interface.ti.com digital control www.ti.com/digitalcontrol logic logic.ti.com military www.ti.com/military power mgmt power.ti.com optical networking www.ti.com/opticalnetwork microcontrollers microcontroller.ti.com security www.ti.com/security telephony www.ti.com/telephony video & imaging www.ti.com/video wireless www.ti.com/wireless mailing address: texas instruments post office box 655303 dallas, texas 75265 copyright ? 2005, texas instruments incorporated

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