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$ the oky-t/3 and -t/5 series are miniature non- isolated point-of-load (pol) switch mode dc/dc power converters for embedded applications. the module is fully compatible with distributed-power open standards alliance (dosa) industry-standard speci? cations (www.dosapower.com). applications include powering cpus, datacom/telecom systems, distributed bus architectures (dba), programmable logic and mixed voltage systems. the wide input range is 8.3 to 14 volts dc. two maximum output currents are offered, 3 amps (t/3 models) or 5 amps (t/5 models). based on ? xed- frequency synchronous buck converter switching topology, the high power conversion ef? cient point of load (pol) module features programmable output voltage and on/off control. these converters also include under voltage lock out (uvlo), output short circuit protection, over-current and over temperature protections. these units are designed to meet all standard ul/en/iec 60950-1 safety and fcc emi/rfi emissions certi? cations and rohs6 hazardous substance compliance. product overview connection diagram figure 1. oky-t/3, -t/5 note: murata power solutions strongly recommends an external input fuse, f1. see speci? cations. external dc power source f1 on/off control common common open = on closed = off +vin +vout trim controller reference and error ampli?er t4xjudijoh t'jmufst t$vssfou4fotf features non-isolated smt pol dc/dc power module 8.3-14vdc input voltage range programmable output voltage from 0.75-5.5vdc 3 amp (t/3) or 5 amp (t/5) output current models drives 1000 f capacitive loads high power conversion ef? ciency 93% at 3.3 vout outstanding thermal derating performance over temperature and over current protection on/off control ul/en/iec 60950-1 safety industry-standard (dosa) surface-mount package rohs6 hazardous substance compliance typical unit contents page description, connection diagram, photograph 1 ordering guide, model numbering 2 mechanical speci? cations, input/output pinout 3 detailed electrical speci? cations 4 output voltage adjustment, soldering guidelines 5 application notes 6 oky-t/3-d12 performance data and oscillograms 9 oky-t/5-d12 performance data and oscillograms 15 tape and reel information 21 oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 1 of 22 for full details go to www.murata-ps.com/rohs www.murata-ps.com www.murata-ps.com technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
? dimensions are in inches (mm). ? these are partial model numbers. please refer to the part number structure for complete ordering part numbers. ? all specifications are at nominal line voltage, vout=nominal (5v for d12 models) and full load, +25 ?c. unless otherwise noted. output capacitors are 1 f ceramic and 10 f electrolytic in parallel. input cap is 22 f. see detailed specifica- tions. i/o caps are necessary for our test equipment and may not be needed for your application. vin must be 2v or higher than vout for 3.3 to 5v outputs. ripple and noise is shown at vout=1v. see specs for details. ? max. v out = 5.1v at i out = 5a. ? max. v out = 5.1v at i out = 3a. ordering guide root model ? output input ef? ciency package v out (volts) i out (amps max) power (watts) r/n (mvp-p) ? regulation (max.) ? v in nom. (volts) range (volts) i in , no load (ma) i in , full load (amps) case c72 ? pinout max. line load min. typ. oky-t/3-d12n-c 0.75-5.5 ? 3 15.3 25 0.1% 0.2% 12 8.3-14 80 1.34 91.5% 93% 0.47 x 0.82 x 0.28 (11.9 x 20.8 x 7.1) p78 oky-t/3-d12p-c 0.75-5.5 ? 3 15.3 25 0.1% 0.2% 12 8.3-14 80 1.34 91.5% 93% 0.47 x 0.82 x 0.28 (11.9 x 20.8 x 7.1) p78 oky-t/5-d12n-c 0.75-5.5 ? 5 25.5 25 0.2% 0.5% 12 8.3-14 80 2.24 91.5% 93% 0.47 x 0.82 x 0.28 (11.9 x 20.8 x 7.1) p78 performance speci? cations and ordering guide part number structure output con? guration: single output, unipolar, low voltage maximum rated output current in amps non-isolated surface mount trimmable output voltage range 0.75-5.5v input voltage range 8.3-14v on/off polarity p = positive polarity n = negative polarity o ky -/ d12 - t 5 c - rohs hazardous substance compliance c = rohs6 ( does not claim eu rohs exemption 7bClead in solder ) n note: some model number combinations may not be available. contact murata power solutions for availability. oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 2 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
mechanical specifications input/output connections oky-t/3, -t/5 pin function 1 on/off control* 2+v in 3 ground (common) 4 trim 5+v out *the remote on/off can be provided with either positive (p suf? x) or negative (n suf? x) polarity figure 2. oky-t/3, -t/5 mechanical outline 0.010 17.52 0.690 4.57 0.180 8.63 0.340 12.69 0.500 0.340 0.25 8.63 0.07 1.8 ref ref 0.47 0.060 ref 0.070 0.82 ref 5.64 ref 0.222 0.420 ref 10.67 0.25 6.2 0.063 1.59 3 2 1 bottom view 4 5 typ 0.090 2.29 1.59 0.063 typ 0.06 1.5 end view mtg plane material: smt pins: copper alloy finish: (all pins) gold (5u"min) over nickel (50u" min) isometric view pin #1 35 21 4 recommended pad layout min 0.120 0.135 max 0.095 min 0.110 max top view pin #1 this point pickup corner (farside) nozzle 0.47 11.9 0.82 20.8 side view oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 3 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 1?
performance and functional speci? cations see note 1 input input voltage range see ordering guide and note 7. isolation not isolated start-up voltage 7.5 v. min, 8.25 v. max undervoltage shutdown (see note 15) 7.3 v. min, 8.05 v. max overvoltage shutdown none re? ected (back) ripple current (note 2) 20 ma pk-pk internal input filter type capacitive recommended external fuse 6a reverse polarity protection n/a. see fuse information. input current: full load conditions see ordering guide inrush transient 0.4 a2sec. shutdown mode (off, uv, ot) 5 ma output in short circuit 60 ma no load 80 ma low line (vin=vmin, 5vout) 1.93 a. (oky-t/3-d12) 3.24 a. (oky-t/5-d12) remote on/off control (note 5) negative logic (n model suf? x) on = open pin or ground to +0.4v. max. off = +1.5v min. to +vin current 1 ma max. positive logic (p model suf? x) on = open pin (internally pulled up) or +7.8vdc to +vin max. off = ground pin to +0.4v. max. current 1 ma max. output output power 15.3w max. (oky-t/3) 25.5w max. (oky-t/5) output voltage range see ordering guide minimum loading no minimum load accuracy (50% load, untrimmed) 2 % of vnominal voltage output range (note 13) see ordering guide overvoltage protection (note 16) none temperature coef? cient 0.02% per c of vout range ripple/noise (20 mhz bandwidth) see ordering guide and note 8 line/load regulation see ordering guide and note 10 ef? ciency see ordering guide maximum capacitive loading (note 14) cap-esr=0.001 to 0.01 ohms 1,000 f cap-esr >0.01 ohms 3,000 f current limit inception (note 6) (98% of vout setting, after warm up) 7.5 amps max. short circuit mode short circuit current output 2 a protection method hiccup autorecovery upon overload removal. (note 17) short circuit duration continuous, no damage (output shorted to ground) prebias startup converter will start up if the external output voltage is less than vnominal. dynamic characteristics dynamic load response 90sec max. to within 2% of ? nal value (50-100-50% load step, di/dt=2.5a/ sec) start-up time 8 msec for vout=nominal (vin on or on/off to vout regulated) switching frequency 320 khz 30 khz environmental calculated mtbf telecordia method (4a) oky-t/3-d12n-c: 10,155,200 hours calculated mtbf mil-hdbk-217n2 method (4b) oky-t/3-d12n-c: 6,309,035 hours operating temperature range (ambient, vertical mount) see derating curves -40 to +85 ?c. with derating (note 9) operating pc board temperature -40 to +100 ?celsius max., no derating (12) storage temperature range -55 to +125 deg. c. thermal protection/shutdown +130 ?celsius relative humidity to 85%/+85 ?c., non-condensing physical outline dimensions see mechanical speci? cations weight 0.1 ounces (2.8 grams) electromagnetic interference designed to meet fcc part 15, class b, en55022 and cispr22 class b conducted and radiated (may need external ? lter) safety designed to meet ul/cul 60950-1, csa- c22.2 no. 60950-1, iec/en 60950-1 restriction of hazardous substances rohs6 ( does not claim eu rohs exemption 7bClead in solder ) msl rating 2 absolute maximum ratings input voltage (continuous or transient) 0 v.to +15 volts max. on/off control 0 v. min. to +vin max. input reverse polarity protection see fuse section output current (note 7) current-limited. devices can withstand a sustained short circuit without damage. the outputs are not intended to accept appreciable reverse current. storage temperature -55 to +125 ?c. lead temperature see soldering speci? cations absolute maximums are stress ratings. exposure of devices to greater than any of 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 or recommended. speci? cation notes: (1) speci? cations are typical at +25 c, vin=nominal (+12v.), vout=nominal (+5v), full load, external caps and natural convection unless otherwise indicated. extended tests at full power must supply substantial forced air? ow. all models are tested and speci? ed with external 1 f paralleled with 10f ceramic/tantalum output capacitors and a 22 f external input capacitor. all capacitors are low esr types. these capacitors are necessary to accommodate our test equipment and may not be required to achieve speci? ed performance in your applications. however, murata power solutions recommends installation of these capacitors. all models are stable and regulate within spec under no-load conditions. (2) input back ripple current is tested and speci? ed over a 5 hz to 20 mhz bandwidth. input ? ltering is cin=2 x 100 f tantalum, cbus=1000 f electrolytic, lbus=1 h. (3) note that maximum power derating curves indicate an average current at nominal input voltage. at higher temperatures and/or lower air? ow, the dc/dc converter will tolerate brief full current outputs if the total rms current over time does not exceed the derating curve. (4a) mean time before failure is calculated using the telcordia (belcore) sr-332 method 1, case 3, ground ? xed conditions, tpcboard=+25 ?c, full output load, natural air convection. (4b) mean time before failure is calculated using the mil-hdbk-217n2 method, ground benign, +25oc., full output load, natural convection. (5) the on/off control input should use either a switch or an open collector/open drain transistor referenced to -input common. a logic gate may also be used by applying appropriate external voltages which do not exceed +vin. (6) short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 4 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
speci? cation notes, cont.: (7) for w5 models, the input voltage must exceed the output voltage at all times by the ratio of vin >= (1.15 x vout). please see the separate w5 data sheet. (8) output noise may be further reduced by adding an external ? lter. at zero output current, the output may contain low frequency components which exceed the ripple speci? cation. the output may be operated inde? nitely with no load. (9) all models are fully operational and meet published speci? cations, including cold start at C40? c. (10) regulation speci? cations describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. (11) other input or output voltage ranges will be reviewed under scheduled quantity special order. (12) maximum pc board temperature is measured with the sensor in the center of the converter. (13) do not exceed maximum power speci? cations when adjusting the output trim. (14) the maximum output capacitive loads depend on the the equivalent series resistance (esr) of the external output capacitor and, to a lesser extent, the distance and series impedance to the load. larger caps will reduce output noise but may change the transient response. newer ceramic caps with very low esr may require lower capacitor values to avoid instability. thoroughly test your capacitors in the application. please refer to the output capacitive load application note. (15) do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times. otherwise, you risk having the converter turn off. the undervoltage shutdown is not latching and will attempt to recover when the input is brought back into normal operating range. (16) the outputs are not intended to sink appreciable reverse current. (17) hiccup overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. if the overcurrent condition still exists, the restart current will be removed and then tried again. this short current pulse prevents overheating and damaging the converter. once the fault is removed, the converter immediately recovers normal operation. output voltage adustment the output voltage may be adjusted over a limited range by connecting an external trim resistor (rtrim) between the trim pin and ground. the rtrim resistor must be a 1/10 watt precision metal ? lm type, 1% accuracy or better with low temperature coef? cient, 100 ppm/oc. or better. mount the resistor close to the converter with very short leads or use a surface mount trim resistor. in the tables below, the calculated resistance is given. do not exceed the speci? ed limits of the output voltage or the converters maximum power rating when applying these resistors. also, avoid high noise at the trim input. however, to prevent instability, you should never connect any capaci- tors to trim. oky-t/3-d12, -t/5-d12 output voltage calculated rtrim (k) 5.0 v. 1.472 3.3 v. 3.122 2.5 v. 5.009 2.0 v. 7.416 1.8 v. 9.024 1.5 v. 13.05 1.2 v. 22.46 1.0 v. 41.424 0.7525 v. (open) resistor trim equation, d12 models: r trim ( ) = _____________ C1000 v out C 0.7525v 10500 soldering guidelines murata power solutions recommends the speci? cations below when installing these converters. these speci? cations vary depending on the solder type. exceeding these speci? cations may cause damage to the product. be cautious when there is high atmospheric humidity. we strongly recommend a mild pre-bake (100 oc. for 30 minutes). your production environment may differ therefore please thoroughly review these guidelines with your process engineers. reflow solder operations for surface-mount products (smt) for sn/ag/cu based solders: preheat temperature less than 1 oc. per second time over liquidus 45 to 75 seconds maximum peak temperature 260 oc. cooling rate less than 3 oc. per second for sn/pb based solders: preheat temperature less than 1 oc. per second time over liquidus 60 to 75 seconds maximum peak temperature 235 oc. cooling rate less than 3 oc. per second oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 5 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
input fusing certain applications and/or safety agencies may require fuses at the inputs of power conversion components. fuses should also be used when there is the possibility of sustained input voltage reversal which is not current-limited. we recommend a time delay fuse installed in the ungrounded input supply line with a value which is approximately twice the maximum line current, calcu- lated at the lowest input voltage. the installer must observe all relevant safety standards and regulations. for safety agency approvals, install the converter in compliance with the end-user safety standard, i.e. iec/en/ul 60950-1. input under-voltage shutdown and start-up threshold under normal start-up conditions, converters will not begin to regulate properly until the ramping-up input voltage exceeds and remains at the start-up threshold voltage (see speci? cations). once operating, converters will not turn off until the input voltage drops below the under-voltage shutdown limit. subsequent restart will not occur until the input voltage rises again above the start-up threshold. this built-in hysteresis prevents any unstable on/off opera- tion at a single input voltage. users should be aware however of input sources near the under-voltage shutdown whose voltage decays as input current is consumed (such as capacitor inputs), the converter shuts off and then restarts as the external capacitor recharges. such situations could oscillate. to prevent this, make sure the operating input voltage is well above the uv shutdown voltage at all times. start-up time assuming that the output current is set at the rated maximum, the vin to vout start-up time (see speci? cations) is the time interval between the point when the ramping input voltage crosses the start-up threshold and the fully loaded regulated output voltage enters and remains within its speci? ed accuracy band. actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and ? nal value of the input voltage as it appears at the converter. these converters include a soft start circuit to moderate the duty cycle of its pwm controller at power up, thereby limiting the input inrush current. the on/off remote control interval from on command to vout regulated assumes that the converter already has its input voltage stabilized above the start-up threshold before the on command. the interval is measured from the on command until the output enters and remains within its speci? ed accuracy band. the speci? cation assumes that the output is fully loaded at maximum rated current. similar conditions apply to the on to vout regulated speci? cation such as external load capacitance and soft start circuitry. input source impedance these converters will operate to speci? cations without external components, assuming that the source voltage has very low impedance and reasonable input voltage regulation. since real-world voltage sources have ? nite imped- application notes ance, performance is improved by adding external ? lter components. some- times only a small ceramic capacitor is suf? cient. since it is dif? cult to totally characterize all applications, some experimentation may be needed. note that external input capacitors must accept high speed switching currents. because of the switching nature of dc/dc converters, the input of these converters must be driven from a source with both low ac impedance and adequate dc input regulation. performance will degrade with increasing input inductance. excessive input inductance may inhibit operation. the dc input regulation speci? es that the input voltage, once operating, must never degrade below the shut-down threshold under all load conditions. be sure to use adequate trace sizes and mount components close to the converter. i/o filtering, input ripple current and output noise all models in this converter series are tested and speci? ed for input re? ected ripple current and output noise using designated external input/output com- ponents, circuits and layout as shown in the ? gures below. external input capacitors (cin in the ? gure) serve primarily as energy storage elements, minimizing line voltage variations caused by transient ir drops in the input conductors. users should select input capacitors for bulk capacitance (at appropriate frequencies), low esr and high rms ripple current ratings. in the ? gure below, the cbus and lbus components simulate a typical dc voltage bus. your speci? c system con? guration may require additional considerations. please note that the values of cin, lbus and cbus will vary according to the speci? c converter model. in critical applications, output ripple and noise (also referred to as periodic and random deviations or pard) may be reduced by adding ? lter elements such as multiple external capacitors. be sure to calculate component tempera- ture rise from re? ected ac current dissipated inside capacitor esr. in the ? gure, the two copper strips simulate real-world printed circuit impedances between the power supply and its load. in order to minimize circuit errors and standardize tests between units, scope measurements should be made using bnc connectors or the probe ground should not exceed one half inch and soldered directly to the ? xture. c in v in c bus l bus c in = 2 x 100f, esr < 700m @ 100khz c bus = 1000f, esr < 100m @ 100khz l bus = 1h +input -input current probe to oscilloscope + C + C figure 2: measuring input ripple current oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 6 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
minimum output loading requirements all models regulate within speci? cation and are stable under no load to full load conditions. operation under no load might however slightly increase output ripple and noise. thermal shutdown to prevent many over temperature problems and damage, these converters include thermal shutdown circuitry. if environmental conditions cause the temperature of the dc/dcs to rise above the operating temperature range up to the shutdown temperature, an on-board electronic temperature sensor will power down the unit. when the temperature decreases below the turn-on threshold, the converter will automatically restart. there is a small amount of hysteresis to prevent rapid on/off cycling. the temperature sensor is typically located adjacent to the switching controller, approximately in the center of the unit. see the performance and functional speci? cations. caution: if you operate too close to the thermal limits, the converter may shut down suddenly without warning. be sure to thoroughly test your applica- tion to avoid unplanned thermal shutdown. temperature derating curves the graphs in the next section illustrate typical operation under a variety of conditions. the derating curves show the maximum continuous ambient air temperature and decreasing maximum output current which is acceptable under increasing forced air? ow measured in linear feet per minute (lfm). note that these are average measurements. the converter will accept brief increases in current or reduced air? ow as long as the average is not exceeded. note that the temperatures are of the ambient air? ow, not the converter itself which is obviously running at higher temperature than the outside air. also note that very low ? ow rates (below about 25 lfm) are similar to natural convection, that is, not using fan-forced air? ow. murata power solutions makes characterization measurements in a closed cycle wind tunnel with calibrated air? ow. we use both thermocouples and an infrared camera system to observe thermal performance. as a practical matter, it is quite dif? cult to insert an anemometer to precisely measure air? ow in most applications. sometimes it is possible to estimate the effective air? ow if you thoroughly understand the enclosure geometry, entry/exit ori? ce areas and the fan ? owrate speci? cations. caution: if you routinely or accidentally exceed these derating guidelines, the converter may have an unplanned over temperature shut down. also, these graphs are all collected at slightly above sea level altitude. be sure to reduce the derating for higher density altitude. output overvoltage protection this converter monitors its output voltage for an over-voltage condition. if the output exceeds ovp limits, the sensing circuit will power down the unit, and the output voltage will decrease. after a time-out period, the pwm will automatically attempt to restart, causing the output voltage to ramp up to its rated value. it is not necessary to power down and reset the converter for the automatic ovp-recovery restart. if the fault condition persists and the output voltage climbs to excessive levels, the ovp circuitry will initiate another shutdown cycle. this on/off cycling is referred to as hiccup mode. it safely tests full current rated output voltage without damaging the converter. output fusing the converter is extensively protected against current, voltage and temperature extremes. however your output application circuit may need additional protec- tion. in the extremely unlikely event of output circuit failure, excessive voltage could be applied to your circuit. consider using an appropriate fuse in series with the output. output current limiting as soon as the output current increases to approximately 125% to 150% of its maximum rated value, the dc/dc converter will enter a current-limiting mode. the output voltage will decrease proportionally with increases in output current, thereby maintaining a somewhat constant power output. this is also commonly referred to as power limiting. current limiting inception is de? ned as the point at which full power falls below the rated tolerance. see the performance/functional speci? cations. note particularly that the output current may brie? y rise above its rated value in normal operation as long as the average output power is not exceeded. this enhances reliability and continued operation of your application. if the output current is too high, the converter will enter the short circuit condition. output short circuit condition when a converter is in current-limit mode, the output voltage will drop as the output current demand increases. if the output voltage drops too low (approxi- mately 98% of nominal output voltage for most models), the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the pwm controller. following a time-out period, the pwm will restart, causing the output voltage to begin ramping up to its appropriate value. if the short-circuit condition persists, another shutdown cycle will initiate. this rapid on/off cycling is called hiccup mode. the hiccup cycling reduces the average output current, thereby preventing excessive internal temperatures and/or component damage. a short circuit can be tolerated inde? nitely. the hiccup system differs from older latching short circuit systems because you do not have to power down the converter to make it restart. the system will automatically restore operation as soon as the short circuit condi- tion is removed. c1 c1 = 0.1f ceramic c2 = 10f tantalum load 2-3 inches (51-76mm) from module c2 r load copper strip copper strip scope +output -output figure 3: measuring output ripple and noise (pard) oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 7 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
remote on/off control on the input side, a remote on/off control can be ordered with either polarity. please refer to the connection diagram on page 1 for on/off connections. positive: standard models are enabled when the on/off pin is left open or is pulled high to +vin with respect to Cvin. an internal bias current causes the open pin to rise to +vin. positive-polarity devices are disabled when the on/off is grounded or brought to within a low voltage (see speci? cations) with respect to Cvin. negative: optional negative-polarity devices are on (enabled) when the on/ off is grounded or brought to within a low voltage (see speci? cations) with respect to Cvin. the device is off (disabled) when the on/off is left open or is pulled high to +vin with respect to Cvin. dynamic control of the on/off function should be able to sink appropriate signal current when brought low and withstand appropriate voltage when brought high. be aware too that there is a ? nite time in milliseconds (see speci? cations) between the time of on/off control activation and stable, regulated output. this time will vary slightly with output load type and current and input conditions. output capacitive load these converters do not require external capacitance added to achieve rated speci? cations. users should only consider adding capacitance to reduce switching noise and/or to handle spike current load steps. install only enough capacitance to achieve noise objectives. excess external capacitance may cause regulation problems, degraded transient response and possible oscilla- tion or instability. the maximum rated output capacitance and esr speci? cation is given for a capacitor installed immediately adjacent to the converter. any extended output wiring or smaller wire gauge or less ground plane may tolerate somewhat higher capacitance. also, capacitors with higher esr may have a larger capaci- tance. what counts here is the instantaneous maximum output current during power-on charge-up and switching currents under load. excessive current will trip the overcurrent detection and shut off the converter. oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 8 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/3-d12 performance data: vout = .75v oky-t/3-d12 oscillograms: vout = .75v oky-t/3-d12 performance data: vout = 1v oky-t/3-d12 output ripple and noise (vin=12v, vout=0.75v, iout=3a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=0.75v, iout=3a, cload=0) trace 4=enable in, trace2=vout oky-t/3-d12 maximum current temperature derating @ sea level (v in = 12v, v out = .75v, air? ow is transverse) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) oky-t/3-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 1v, air? ow is transverse) oky-t/3-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 1v) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) ef?ciency (%) load current (amps) 0 0.5 1 1.5 2 2.5 3 3.5 0 10 20 30 40 50 60 70 80 90 v in = 8.3v v in = 12v v in = 13.8v oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 9 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/3-d12 performance data: vout = 1.2v oky-t/3-d12 oscillograms: vout = 1.2v oky-t/3-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 1.2v, air? ow is transverse) oky-t/3-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 1.2v) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) ef?ciency (%) load current (amps) 0 0.5 1 1.5 2 2.5 3 3.5 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 13.8v output ripple and noise (vin=12v, vout=1.2v, iout=3a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=1.2v, iout=3a, cload=0) trace 4=enable in, trace2=vout step load transient response (vin=12v, vout=1.2v, cload=0, iout=1.5a to 3a) trace 1=vout, 50 mv/div. trace 3=iout, 1a/div. step load transient response (vin=12v, vout=1.2v, cload=0, iout=3a to 1.5a) trace 1=vout, 50 mv/div. trace 3=iout, 1a/div. oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 10 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/3-d12 performance data: vout = 1.5v oky-t/3-d12 performance data: vout = 1.8v oky-t/3-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 1.5v, air? ow is transverse) oky-t/3-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 1.5v) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) ef?ciency (%) load current (amps) 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 v in = 8.3v v in = 12v v in = 13.8v oky-t/3-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 1.8v, air? ow is transverse) oky-t/3-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 1.8v) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) ef?ciency (%) load current (amps) 0 10 20 30 40 50 60 70 80 90 100 0 0.5 1 1.5 2 2.5 3 3.5 v in = 8.3v v in = 12v v in = 13.8v oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 11 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/3-d12 performance data: vout = 2.5v oky-t/3-d12 oscillograms: vout = 2.5v oky-t/3-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 2.5v, air? ow is transverse) oky-t/3-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 2.5v) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) ef?ciency (%) load current (amps) 0 0.5 1 1.5 2 2.5 3 3.5 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 13.8v output ripple and noise (vin=12v, vout=2.5v, iout=3a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=2.5v, iout=3a, cload=0) trace 4=enable in, trace2=vout step load transient response (vin=12v, vout=2.5v, cload=0, iout=3a to 1.5a) trace 1=vout, 50 mv/div. trace 3=iout, 1a/div. step load transient response (vin=12v, vout=2.5v, cload=0, iout=1.5a to 3a) trace 1=vout, 50 mv/div. trace 3=iout, 1a/div. oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 12 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/3-d12 performance data: vout = 3.3v oky-t/3-d12 oscillograms: vout = 3.3v oky-t/3-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 3.3v, air? ow is transverse) oky-t/3-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 3.3v) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) ef?ciency (%) load current (amps) 0 0.5 1 1.5 2 2.5 3 3.5 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 13.8v output ripple and noise (vin=12v, vout=3.3v, iout=3a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=3.3v, iout=0.04a, cload=0) trace 4=enable in, trace2=vout step load transient response (vin=12v, vout=3.3v, cload=0, iout=3a to 1.5a) trace 1=vout, 50 mv/div. trace 3=iout, 1a/div. step load transient response (vin=12v, vout=3.3v, cload=0, iout=1.5a to 3a) trace 1=vout, 50 mv/div. trace 3=iout, 1a/div. oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 13 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/3-d12 performance data: vout = 5v oky-t/3-d12 oscillograms: vout = 5v oky-t/3-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 5v, air? ow is transverse) oky-t/3-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 5v) 1.0 1.3 1.5 1.8 2.0 2.3 2.5 2.8 3.0 3.3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) 0 10 20 30 40 50 60 70 80 90 100 ef?ciency (%) 0 0.5 1 1.5 2 2.5 3 3.5 load current (amps) v in = 8.3v v in = 12v v in = 13.8v output ripple and noise (vin=12v, vout=5v, iout=3a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=5v, iout=3a, cload=0) trace 4=enable in, trace2=vout step load transient response (vin=12v, vout=5v, cload=0, iout=1.5a to 3a) trace 1=vout, 50 mv/div. trace 3=iout, 1a/div. step load transient response (vin=12v, vout=5v, cload=0, iout=3a to 1.5a) trace 1=vout, 50 mv/div. trace 3=iout, 1a/div. oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 14 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/5-d12 performance data: vout = .75v oky-t/5-d12 oscillograms: vout = .75v oky-t/5-d12 performance data: vout = 1v oky-t/5-d12 maximum current temperature derating @ sea level (v in = 12v, v out = .75v, air? ow is transverse) 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) output ripple and noise (vin=12v, vout=0.75v, iout=5a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=0.75v, iout=5a, cload=0) trace 4=enable in, trace2=vout oky-t/5-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 1v) 0123456 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 14v ef?ciency (%) load current (amps) oky-t/5-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 1v, air? ow is transverse) 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 15 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/5-d12 performance data: vout = 1.2v oky-t/5-d12 oscillograms: vout = 1.2v output ripple and noise (vin=12v, vout=1.2v, iout=5a, cload=0, scopebw=100mhz) step load transient response (vin=12v, vout=1.2v, cload=0, iout=2.5a to 5a) trace 1=vout, 100 mv/div. trace 3=iout, 2a/div. step load transient response (vin=12v, vout=1.2v, cload=0, iout=5a to 2.5a) trace 1=vout, 100 mv/div. trace 3=iout, 2a/div. oky-t/5-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 1.2v) 0123456 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 14v ef?ciency (%) load current (amps) oky-t/5-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 1.2v, air? ow is transverse) 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 16 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/5-d12 performance data: vout = 1.5v oky-t/5-d12 performance data: vout = 1.8v oky-t/5-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 1.5v) 0123456 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 14v ef?ciency (%) load current (amps) oky-t/5-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 1.5v, air? ow is transverse) 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) oky-t/5-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 1.8v, air? ow is transverse) oky-t/5-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 1.8v) 0123456 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 14v ef?ciency (%) load current (amps) 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 17 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/5-d12 performance data: vout = 2.5v oky-t/5-d12 oscillograms: vout = 2.5v output ripple and noise (vin=12v, vout=2.5v, iout=5a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=2.5v, iout=5a, cload=0) trace 4=enable in, trace2=vout step load transient response (vin=12v, vout=2.5v, cload=0, iout=2.5a to 5a) trace 1=vout, 100 mv/div. trace 3=iout, 2a/div. step load transient response (vin=12v, vout=2.5v, cload=0, iout=5a to 2.5a) trace 1=vout, 100 mv/div. trace 3=iout, 2a/div. oky-t/5-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 2.5v) ef?ciency (%) load current (amps) 0123456 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 14v oky-t/5-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 2.5v, air? ow is transverse) 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 18 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/5-d12 performance data: vout = 3.3v oky-t/5-d12 oscillograms: vout = 3.3v output ripple and noise (vin=12v, vout=3.3v, iout=5a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=3.3v, iout=5a, cload=0) trace 4=enable in, trace2=vout step load transient response (vin=12v, vout=3.3v, cload=0, iout=2.5a to 5a) trace 1=vout, 100 mv/div. trace 3=iout, 2a/div. step load transient response (vin=12v, vout=3.3v, cload=0, iout=5a to 2.5a) trace 1=vout, 100 mv/div. trace 3=iout, 2a/div. oky-t/5-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 3.3v, air? ow is transverse) oky-t/5-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 3.3v) ef?ciency (%) load current (amps) 0123456 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 14v 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 19 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/5-d12 performance data: vout = 5v oky-t/5-d12 oscillograms: vout = 5v output ripple and noise (vin=12v, vout=5v, iout=5a, cload=0, scopebw=100mhz) on/off enable startup delay (vin=12v, vout=5v, iout=5a, cload=0 trace 4=enable in, trace2=vout step load transient response (vin=12v, vout=5v, cload=0, iout=2.5a to 5a) trace 1=vout, 100 mv/div. trace 3=iout, 2a/div. step load transient response (vin=12v, vout=5v, cload=0, iout=5a to 2.5a) trace 1=vout, 100 mv/div. trace 3=iout, 2a/div. oky-t/5-d12 maximum current temperature derating @ sea level (v in = 12v, v out = 5v, air? ow is transverse) oky-t/5-d12 ef? ciency vs. line voltage and load current @ 25 c (v out = 5v) ef?ciency (%) load current (amps) 0123456 0 10 20 30 40 50 60 70 80 90 100 v in = 8.3v v in = 12v v in = 14v 3.0 3.3 3.5 3.8 4.0 4.3 4.5 4.8 5.0 5.3 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 natural convection output current (amps) ambient temperature (oc) oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 20 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
third angle projection dimensions are in inches (mm shown for ref. only). components are shown for reference only. tolerances (unless otherwise speci?ed): .xx 0.02 (0.5) .xxx 0.010 (0.25) angles 1? (p/u) 2.33 40.40 1.591 2.00 0.079 22.25 (p/u) 0.876 0.092 0.630 16.00 4.00 (core) 101.6 ref 5.64 0.222 0.420 10.67 1.73 ref 44.0 top cover tape feed (unwind) direction ------- round holes oblong holes pick & place pickup (p/u) reel information (400 units per reel) 1.732 44.00 0.157 4.00 13.00 330.2 .512 13.00 pin #1 this corner (farside) pickup nozzle location ( 3-6mm) 0.47 ref 11.9 0.82 ref 20.8 0.270 6.86 tape and reel information oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 21 of 22 technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com
oky-t/3,t/5-d12 series adjustable output 3 and 5-amp dosa-smt dc/dc converters mdc_ mdc_oky- t/3,t/5-d12 series.b03 page 22 of 22 murata power solutions, inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. the descriptions contained her ein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to cha nge without notice. ? 2008 murata power solutions, inc. usa: mans? eld (ma), tel: (508) 339-3000, email: sales@murata-ps.com canada: toronto, tel: (866) 740-1232, email: toronto@murata-ps.com uk: milton keynes, tel: +44 (0)1908 615232, email: mk@murata-ps.com france: montigny le bretonneux, tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com germany: mnchen, tel: +49 (0)89-544334-0, email: munich@murata-ps.com japan: tokyo, tel: 3-3779-1031, email: sales_tokyo@murata-ps.com osaka, tel: 6-6354-2025, email: sales_osaka@murata-ps.com china: shanghai, tel: +86 215 027 3678, email: shanghai@murata-ps.com guangzhou, tel: +86 208 221 8066, email: guangzhou@murata-ps.com singapore: parkway centre, tel: +65 6348 9096, email: singapore@murata-ps.com murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. tel: (508) 339-3000 (800) 233-2765 fax: (508) 339-6356 www.murata-ps.com email: sales@murata-ps.com iso 9001 and 14001 registered technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000 www.murata-ps.com 03/31/09

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