datel, inc., mans eld, ma 02048 (usa) ? tel: (508)339-3000, (800)233-2765 fax: (508)339-6356 ? email: sales@datel.com ? internet: www.datel.com single output unr series features figure 1. simpli ed schematic non-isolated, 1.8/2.5/3.3v out 3.6-10w dc/dc converters ? ? ? ? ? ? ? ? ? ? ? ? ? innovation and ex c ell e n c e ? ? datel's 3.6-10w unr series consists of non-isolated, 5v-to-1.8v (2a), 5v-to- 2.5v (2a), 5v-to-3.3v (3a), and 12v-to-3.3v (3a) dc/dc converters in miniature, 1" x 1" surface-mount and through-hole packages. the "gull-wing" packages (with metal shells and non-conductive plastic baseplates) weigh a mere 17 grams and can withstand temperatures up to +235?. they are compatible with virtually all contemporary pick-and-place and solder-re ow processes. the true bene ts of distributed power will ultimately be realized only when every low-voltage, high-current cpld, asic, dsp, etc. has its own "power plant" right next to it. with isolated dc/dc converters inevitably residing at the edges of boards in proximity with backplanes and power buses, the "on-board" proliferation of distributed power will continue with more cost-effective, non-isolated devices. the low-cost, easy-to-use (no external components required), highly reliable (100% fully automated smt construction) 3.6-10w unr series makes this power processing at the concluding point of use a practical reality today. these versatile dc/dc's are fully line and load regulated. they feature user- optional on/off control (for power-sequencing requirements), output current limiting, and short-circuit protection (foldback technique with auto-recovery). additionally, the 12v-to-3.3v model offers input undervoltage lockout (at 9.6v). their impressive guaranteed ef ciencies enable all models to deliver their fully rated output power from ?0 to +70? (ambient) without heat sinking or forced-air cooling. if you've already considered and rejected the use of inef cient, step-down, linear regulators, take a look at one of these new switching buck regulators. their high ef ciency, ease-of-use, long-term reliability, and overall cost effectiveness will impress you. safety agency approvals are currently in progress. low cost! high reliability! 1" x 1" smt, 1" x 1" through-hole packages gull-wing leads; standard re ow complete; no external components outputs: 1.8v/2a, 2.5v/2a, 3.3v/3a inputs: 4.75-5.5v, 10.8-13.6v guaranteed ef ciencies to 87% output noise as low as 30mvp-p transient response as quick as 20?ec 40 to +70? operation with no derating on/off control; emc compliant iec950/en60950/ul1950 approvals modi cations and customs for oem's +v in +v out input return on/off c ontrol output return current limiting & s.c. shutdown undervoltage shutdown logic ground reference & error amp pwm controller ? ? "d5" models do not have input undervoltage shutdown. ? "d5" models employ a more traditional buck-regulator design in which this fet is replaced with a power schottky diode. ?
unr series non-isolated, 3.6-10w dc/dc converters 1.00 (25.40) 1.22 (30.99) 0.060 (1.52) 0.0 5 (1. 4 0.110 (2.79) 0.015 (0.38) 4 3 2 1 8 7 6 5 9 0.10 (2.54) 0.100 (2.54) 0.300 (7.62) 0.500 (12.70) 0.47 (11.94) top view 1.00 (25.40) 0.800 (20.32) 4 eq. sp.@ 0.200 (5.08) insulated base metal case dimensions are in inches (mm) case c17 performance speci cations and ordering guide i out (amps) r/n (mvp-p) ? load ? v out (volts) package (case, pinout) ef ciency regulation (max.) line v in nom. (volts) range (volts) model ? typical at t a = +25c under nominal line voltage and full-load conditions, unless otherwise noted. the unr-1.8/2-d5sm/-d5sm models require an external 15k ? pull-up resistor between v in and on/off control for normal operation. see on/off control for details. ? ripple/noise (r/n) measured over a 20mhz bandwidth. the unr-3.3/3-d12/-d12sm models are speci? ed with an external 22f input capacitor. all other models are speci? ed with no external i/o capacitors. output noise on the "d12" model can be reduced signi? cantly with the addition of external output capacitors. see i/o filtering. i in ? (ma) ? max. typ. typ. min. unr-1.8/2-d5 1.8 2 40 75 0.35% 0.5% 5 4.75-5.5 30/900 77% 79% c7a, p9 unr-1.8/2-d5sm 1.8 2 40 75 0.35% 0.5% 5 4.75-5.5 30/900 77% 79% c17, p24 unr-2.5/2-d5 ? 2.5 2 30 50 0.25% 0.5% 5 4.75-5.5 40/1180 83% 85% c7a, p9 unr-2.5/2-d5sm ? 2.5 2 30 50 0.25% 0.5% 5 4.75-5.5 40/1180 83% 85% c17, p24 unr-3.3/3-d5 ? ? 3.3 3 30 45 0.4% 0.5% 5 4.75-5.5 40/2250 86% 88% c7a, p9 unr-3.3/3-d5sm ? ? 3.3 3 30 45 0.4% 0.5% 5 4.75-5.5 40/2250 86% 88% c17, p24 unr-3.3/3-d12 ? 3.3 3 100 150 0.25% 0.5% 12 10.8-13.6 40/930 87% 89% c7a, p9 unr-3.3/3-d12sm ? 3.3 3 100 150 0.25% 0.5% 12 10.8-13.6 40/930 87% 89% c17, p24 output input 2 non-isolated output con guration: u = unipolar nominal output voltage: 1.8, 2.5 or 3.3 volts maximum output current in amps input voltage range: d5 = 4.75-5.5 volts (5v nominal) ? d12 = 10.8-13.6 volts (12v nominal) u nr 2 - / d5 sm - 2.5 surface-mount packaging part number structure mechanical specifications ? d5/d5sm models require a minimum 300ma load current to maintain regulation. the d12/d12sm model has no mimimum load requirement. listed specs apply from 300ma to full load for d5/d5sm models and from no load to full load for the d12/d12sm models. ? nominal line voltage, no-load/full-load conditions. ? internal circuit design of "d5" models mandates that no voltages greater than 1.2v are present on the output pins at power-up. failure to comply may result in start-up problems. ? circuit design of 3.3v -d5/d5sm models mandates that no voltages greater than 1.0v are present on the output pins at power-up. failure to comply may result in start-up problems. 3 1 2 4 6 5 plastic case with an insulated base standoffs 0.020 (0.51) 0.20 min (5.08) 1.00 (25.40) 1.00 (25.40) 0.400 (10.16) 0.200 (5.08) 0.800 (20.32) 0.800 (20.32) 0.45 (11.43) 0.040 0.002 dia. (1.016 0.051) bottom view 0.200 (5.08) 0.100 (2.54) 0.10 (2.54) 0.10 (2.54) dimensions are in inches (mm) case c7a i/o connections pin function p9 function p24 1 logic ground n.c. 2 on/off control logic ground 3 +output on/off control 4 output return n.c. 5 input return +output 6 +input n.c. 7 no pin output return 8 no pin input return 9 no pin +input
unr models non-isolated, 3.6-10w dc/dc converters performance/functional speci cations typical @ t a = +25c under nominal line voltage and full-load conditions with no external ? ltering; speci? cations apply to both surface-mount and through-hole models, unless otherwise noted. ? input input voltage range: d5 models: 1.8v out 4.75-5.5 volts (5v nominal) 2.5v out , 3.3v out ? 4.75-5.5 volts (5v nominal) d12 models 10.8-13.6 volts (12v nominal) overvoltage shutdown none start-up threshold: d12 models ? 10.2v typical, 10.8v maximum undervoltage shutdown: d12 models ? ? 9.6v typical, 8.2v minimum input current: normal operating conditions see ordering guide standby mode (off or undervoltage): 1.8v out 20ma typical, 30ma maximum 2.5v out , 3.3v out d5 models 10ma typical, 20ma maximum 3.3v out d12 models 5ma typical, 10ma maximum input ripple current: 1.8v out , 3.3v out d12 models 50marms 2.5v out , 3.3v out d5 models 150marms input filter type capacitive reverse-polarity protection none on/off control (pin 3) ? ttl high (or open) = on, low = off 1.5v typical logic threshold output v out accuracy (50% load): 1.8v out 1.5% (27mv) maximum 2.5v out 1.75% (43.8mv) maximum 3.3v out d5 models ? 1.5% (50mv) maximum 3.3v out d12 models 1% (33mv) maximum temperature coef cient 0.02% per c ripple/noise (20mhz bw) ? see ordering guide line/load regulation see ordering guide ef ciency see ordering guide current limiting ? auto-recovery dynamic characteristics transient response (50% load step): 1.8v out 20sec to 0.5% of ? nal value 2.5v out , 3.3v out d12 models 30sec to 1% of ? nal value 3.3v out d5 models 40sec to 1% of ? nal value start-up time: ? ? ? v in to v out : d5 models 100msec typical, 120msec maximum d12 models 13msec typical, 20msec maximum on/off to v out : d5 models 60msec typical, 120msec maximum d12 models 13msec typical, 20msec maximum switching frequency 200khz (30khz) environmental operating temperature (ambient): without derating ?40 to +70c with derating to +100c (see derating curves) storage temperature ?40 to +105c ? d5 models require a minimum 300ma load current to maintain speci? ed regulation. d12 models have no minimum load requirement. operating d5 models under no-load conditions will not damage these devices, however they may not meet all listed speci? cations. the unr-1.8/2-d5/-d5sm require an external 15 ? pull-up resistor between v in and on/off control for normal operation. see on/off control for details. the unr-3.3/3-d12/-d12sm are speci? ied with an external 22f input capacitor. see i/o filtering for details. ? see startup threshold and undervoltage shutdown for details. ? see on/off control for details. ? the 22f external input capacitor required for the unr-3.3/3-d12/-d12sm should be minimally rated for 1.5arms ripple current and 125m ? esr. output noise for all models can be further reduced with the installation of external output capacitors. see see i/o filtering for details. ? current limiting initiates at approximately 30% above rated load. under short-circuit conditions, output current folds back to approximately 150ma and input current drops to approximtely 50ma. both remain at those levels until the short is removed. ? see start-up time for details. ? internal circuit design of the "d5" models mandates that no voltages greater than 1.2v are present on the output pins at power-up. failure to comply may result in start-up problems. ? circuit design of the 3.3v out models mandates that no voltages greater than 1.0v are present on the output pins at power-up. failure to comply may result in start-up problems. physical dimensions: . surface mount 1" x 1" x 0.47" (25 x 25 x 11.9mm) through hole 1" x 1" x 0.45" (25 x 25 x 11.4mm) shielding (surface mount) surface mount 5-sided through hole na case connection (surface mount) input return case material surface mount corrosion-resistant steel with non-conductive, epoxy-based, black enamel ? nish and plastic baseplate through hole diallyl phthalate, ul94v-0 rated pin material surface mount copper, tin plated through hole brass, solder coated weight 0.6 ounces (17 grams) input voltage: continuous: d5 models 7 volts d12 models 15 volts transient (100msec): d5 models 15 volts d12 models 24 volts input reverse-polarity protection none output overvoltage protection none output current current limited. devices can withstand a sustained output short circuit without damage. storage temperature ?40 to +105c lead temperature (soldering, 10 sec.) +300c these are stress ratings. exposure of devices to any of these conditions may adversely affect long-term reliability. proper operation under conditions other than those listed in the performance/functional speci? cations table is not implied. absolute maximum ratings 3
unr series non-isolated, 3.6-10w dc/dc converters return current paths the input return (pin 8), output return (pin 7) and logic ground (pin 2) are all connected to each other internal to each device. to the extent possible, all load current should be returned through pin 7 (via low-impedance runs) and all input current returned through pin 8. any control signals applied to pin 3 should be referenced to pin 2. the internal trace leading to pin 2 is not designed to carry high current. devices should never be installed in a manner that results in high current ? ow through pin 2 (i.e., pins 7 and 8 should never be left open or attached via high-impedance connections). input fusing certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. fuses should also be used if the possibility of sustained, non-current-limited, input-voltage polarity reversals exists. for datel unr sm series 3.6-10 watt dc/dc converters, you should use slow-blow type fuses with values no greater than the follow- ing. model number fuse value unr-1.8/2-d5/-d5sm 1.5 amps unr-2.5/2-d5/-d5sm 2 amps unr-3.3/3-d5/-d5sm 3 amps unr-3.3/3-d12/-d12sm 1.5 amps start-up threshold and undervoltage shutdown (unr-3.3/3-d12/-d12sm only) under normal start-up conditions, unr-3.3/3-d12/-d12sm devices will not begin to regulate until the ramping input voltage exceeds the start-up threshold voltage (typically 10.2v). once operating, devices will not turn off until the input voltage drops below the undervoltage shutdown/lockout limit (typically 9.6v). subsequent re-start will not occur until the input is brought back up to the start-up threshold. this built-in hysteresis obviously avoids any indeterminate on/off conditions at a single voltage. start-up time for the three "d5" models (that do not have an input turn-on threshold), the v in to v out start-up time is the interval between the time a step input is applied to the device and the fully loaded output voltage enters and remains within its speci? ed accuracy band. for the unr-3.3/3-d12/-d12sm, v in to v out start-up time is the interval between the time at which a rapidly ramping input voltage crosses the turn-on threshold point and the fully loaded output voltage enters and remains within its speci? ed accuracy band. actual measured times will vary with input source impedance, external input capacitance, and the slew rate and ? nal value of the input voltage as it appears to the converter. the on/off to v out start-up time assumes the converter is turned off via the on/off control with the nominal input voltage already applied to the converter. the speci? cation de? nes the interval between the time at which the converter is turned on and the fully loaded output voltage enters and remains within its speci? ed accuracy band. internal circuit design of the 3.3v out models mandates that no voltages greater than 1.0v are present on the output pins at power-up. failure to comply may result in start-up problems. i/o filtering and noise reduction all "d5" models of unr 3.6-10w series dc/dc converters achieve their rated ripple and noise speci? cations without the use of external input/output capacitors. the unr-3.3/3-d12/-d12sm models are tested and speci? ed with a single, external 22f input capacitor (minimally rated for 1.5arms ripple current and 120m ? esr). in critical applications, input/output ripple/noise may be further reduced by installing additional external i/o caps. input capacitors, which function pri- marily as energy-storage elements, should be selected for bulk capacitance, low esr and high rms-ripple-current ratings. output capacitors, which func- tion more as true ? lter elements, should be selected for bulk capacitance, low esr, and appropriate frequency response. all caps should have appropriate voltage ratings and be mounted as close to the converters as possible. temperature variations for all parameters should obviously be taken into consideration. the most effective combination of external i/o capacitors will be a function of your line voltage and source impedance, as well as your particular load and layout conditions. our applications engineers will be happy to recommend potential solutions and can discuss the possibility of our modifying a given device?s internal ? ltering to meet your speci? c requirements. contact our applications engineering group for additional details. 4 technical notes output power (watts) ambient temperature (?c) unr-3.3/3-d5 unr-3.3/3-d5sm unr-3.3/3-d12 unr-3.3/3-d12sm unr-2.5/2-d5sm unr-2.5/2-d5sm 10 9 8 7 6 5 4 3 2 1 0 ?400 404550556065707580859095100 unr-1.8/2-d5 unr-1.8/2-d5sm temperature derating
unr models non-isolated, 3.6-10w dc/dc converters 260 240 220 200 180 160 140 120 100 80 60 40 20 0 0 30 60 90 120 150 180 210 240 270 300 pre-heat and temperature soak solder reflow peak temp. 235 c time (seconds) temperature ( c) on/off control the on/off control pin (pin 3) may be used for remote on/off operation. unr sm series converters are designed so that they are enabled when the control pin is pulled high or left open (normal mode) and disabled when the control pin is pulled low (to less than +0.8v relative to logic ground, pin 2). as shown in the ? gure and table below, each device has an internal pull-up resistor on its on/off control pin whose value and voltage vary with model. dynamic control of the on/off function is best accomplished with a mechanical relay or an open-collector/open-drain drive circuit (optically isolated if appro- priate). the drive circuit should obviously be able to sink appropriate current when activated and withstand appropriate voltage when deactivated. applying an external voltage to pin 3 when no input power is applied to the converter can cause permanent damage to the converter. the on/off control function, however, is designed such that the converter can be disabled (pin 3 pulled low) while input power is ramping up and then "released" once the input has stabilized. the time duration between the point at which the converter is released and its fully loaded output voltage settles to within speci? ed accuracy can be found in the performance/functional speci? cations table. solder re ow for unr 3.6-10w series devices, the packages' gull-wing leads are made of tin-plated (150 microinches) copper. the gull-wing con? guration, as opposed to "j" leads, was selected to keep the solder joints out from under the package to minimize both heat conduction away from the leads (into the encapsulated package) and ir shadowing effects. through a series of experi- ments, using 8 mil-thick, 63/37/2 (lead/tin/silver) solder paste and single-layer test boards, we have determined an optimal solder-re? ow temperature pro? le as shown in figure 2. obviously, your optimal pro? le will be a function of many factors including paste thickness, board thickness, number of conduc- tive layers, copper weight, the density of surrounding components, etc. the pro? le in figure 3 should be used as a starting point for your own experi- ments. if you'd like, datel can provide you with complimentary "dummy" units to be used in such tests. under no circumstances should the peak temperature exceed +235c for an extended period of time. as shown in figure 4, our tests have determined the optimal landing-pad size to be 160 mils by 130 mils. figure 2. driving the on/off control pin figure 3. optimal solder re ow pro le +input logic ground 9 2 v ip r ip r ep 3 on/off control internal external internal pull-up pull-up pull-up model resistor (r ip ) resistor (r ep ) voltage (v ip ) unr-1.8/2-d5/-d5sm 1k ? 15k ? 1.8v unr-2.5/2-d5/-d5sm 1k ? n.a. 2.5v unr-3.3/3-d5/-d5sm 1k ? n.a. 3.3v unr-3.3/3-d12/-d12sm 10k ? n.a. v in figure 4. pc board land pattern 0.130* (3.30) 0.015 (0.38) 0.100** (2.54) * pad dimension ** lead dimension 0.160* (4.06) 0.110** (2.79) 5 currently available for hand soldering only. contact datel.
unr series non-isolated, 3.6-10w dc/dc converters ef ciency vs. output current and input voltage 82 81 80 79 78 77 76 75 74 73 unr-1.8/2-d5/-d5sm (guaranteed efficiency = 77% at v in = 5v and i out = 2a) 0.5 0.8 1.1 1.4 1.7 2 +1.8v output current (amps) v in = 5v v in = 5.5v v in = 4.5v efficiency ( % ) 87 86 85 84 83 82 81 80 79 78 unr-2.5/2-d5/-d5sm (guaranteed efficiency = 83% at v in = 5v and i out = 2a) 0.5 0.8 1.1 1.4 1.7 2 +2.5v output current (amps) v in = 4.75v v in = 5.5v v in = 5v efficiency ( % ) 91 90 89 88 87 86 85 84 83 82 unr-3.3/3-d5/-d5sm (guaranteed efficiency = 86% at v in = 5v and i out = 3a) 0.5 1 1.5 2 2.5 3 +3.3v output current (amps) v in = 4.75v v in = 5.5v v in = 5v efficiency ( % ) 92 89 86 83 80 77 74 71 68 65 unr-3.3/3-d12/-d12sm (guaranteed efficiency = 87% at v in = 12v and i out = 3a) 0.5 1 1.5 2 2.5 3 +3.3v output current (amps) v in = 10.4v v in = 13.6v v in = 12v efficiency ( % ) 6 typical performance curves
unr models non-isolated, 3.6-10w dc/dc converters datel?s world-class design, development and manufacturing team stands ready to work with you to deliver the exact power converter you need for your demanding, large volume, oem applications. and ... we?ll do it on time and within budget! our experienced applications and design staffs; quick-turn prototype capa- bility; highly automated, smt assembly facilities; and in-line spc quality- control techniques combine to give us the unique ability to design and deliver any quantity of power converters to the highest standards of quality and reliability. we have compiled a large library of dc/dc designs that are currently used in a variety of telecom, medical, computer, railway, aerospace and industrial applications. we may already have the converter you need. contact us. our goal is to provide you the highest-quality, most cost-effective power converters available. datel makes no representation that the use of its products in the circuits described herein, or the use of other technical info rmation contained herein, will not infringe upon existing or future patent rights. the descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to change without notice. the datel logo is a registered datel, inc. trademark. datel (uk) ltd. tadley, england tel: (01256)-880444 datel s.a.r.l. montigny le bretonneux, france tel: 01-34-60-01-01 datel gmbh mnchen, germany tel: 89-544334-0 datel kk tokyo, japan tel: 3-3779-1031, osaka tel: 6-6354-2025 datel, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 tel: (508) 339-3000 (800) 233-2765 fax: (508) 339-6356 internet: www.datel.com email: sales@datel.com data sheet fax back: (508) 261-2857 ds-0442a 7/01 innovation and ex c ell e n c e ? ? iso 9001 registered 7 if you?re designing with emc in mind, please note that all of datel?s 3.6-10 watt unr series dc/dc converters have been characterized for radiated and conducted emissions in our new emi/emc laboratory. testing is conducted in an emco 5305 gtem test cell utilizing emco automated emc test software. radiated emissions are tested to the limits of fcc part 15, class b and cispr 22 (en 55022), class b. correlation to other speci? ca- tions can be supplied upon request. radiated emissions plots to fcc and cispr 22 for model unr-3.3/3-d5sm appear below. published emc test reports are available for each model number. contact datel's applications engineering department for more details. emi radiated emissions 80 70 60 50 40 30 20 10 0 ?10 ?20 100 1000 frequency (mhz) 100 1000 frequency (mhz) radiated emissions (dbv/m) 80 70 60 50 40 30 20 10 0 ?10 ?20 radiated emissions (dbv/m) unr-3.3/3-d5sm radiated emissions fcc part 15 class b, 3 meters converter output = 3.3vdc @ 2.7 amps unr-3.3/3-d5sm radiated emissions en 55022 class b, 10 meters converter output = 3.3vdc @ 2.7 amps radiated emissions radiated emissions fcc class b limit en 55022 class b limit custom capabilities
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