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fabricated on a 0.41 by 0.65 inch (10.4 by 16.5 mm) single inline package (sip) module, the oki- 78sr series are non-isolated switching regulator (sr) dc/dc power converters for embedded ap- plications. the ? xed single output converters offer both tight regulation and high ef? ciency directly at the power usage site and are a direct plug-in replacement for to-220 package 78xx series linear regulators. typically, no extra outside components are required. two nominal output voltages are offered (3.3 and 5 vdc), each with 1.5 amp maximum output. based on ? xed-frequency buck switching topology, the high ef? ciency means very low heat and little electrical noise, requiring no external components. the ultra wide input range is 7 to 36 volts dc. protection features include input undervoltage and short circuit protection, overcurrent and over temperature shut down. the oki-78sr is designed to meet all standards approvals. rohs-6 (no lead) hazardous material compliance is speci? ed as standard. product overview connection diagram figure 1. oki-78sr note: murata power solutions strongly recommends an external input fuse, f1. see speci? cations. external dc power source f1 common common +vin +vout controller reference and error ampli?er t4xjudijoh t'jmufst t$vssfou4fotf features ultra wide 7 to 36 vdc input range fixed outputs of 3.3 or 5 vdc up to 1.5 amps vertical or horizontal sip-mount, small footprint package no heat sink direct replacement for 3-terminal 78xx-series linear regulators high ef? ciency with no external components short circuit protection outstanding thermal derating performance ul/en/iec 60950-1, 2nd edition safety approv- als (pending) contents page description, connection diagram, photograph 1 ordering guide, model numbering, product labeling 2 detailed electrical speci? cations 3 mechanical speci? cations, input/output pinout 4 performance data and oscillograms 6 soldering guidelines, technical notes 10 feat u re s typical unit mdc_oki-78sr-w36.a06 p age 1 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com for full details go to www.murata-ps.com/rohs $ www.murata-ps.com/support (certi? cation is pending)
part number structure ? dimensions are in inches (mm). ? all specifications are at nominal line voltage, vout = nominal and full load, +25 ?c., with no external capacitor, unless otherwise noted. 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) max. line load min. typ. oki-78sr-3.3/1.5-w36-c 3.3 1.5 4.95 40 0.25% 0.25% 24 7-36 5 0.48 84% 85.5% 0.41 x 0.65 x 0.3 (10.4 x 16.5 x 7.62) oki-78sr-5/1.5-w36-c 5 1.5 7.5 75 0.25% 0.25% 24 7-36 5 0.69 89% 90.5% 0.41 x 0.65 x 0.3 (10.4 x 16.5 x 7.62) performance speci? cations and ordering guide product label because of the small size of these products, the product label contains a character-reduced code to indicate the model number and manufacturing date code. not all items on the label are always used. please note that the label dif- fers from the product photograph on page 1. here is the layout of the label: the label contains three rows of information: first row C murata power solutions logo second row C model number product code (see table) third row C manufacturing date code and revision level the manufacturing date code is four characters: first character C last digit of manufacturing year, example 200 9 second character C month code (1 through 9 and o through d) third character C day code (1 through 9 = 1 to 9, 10 = o and 11 through 31 = a through z) fourth character C manufacturing information figure 2. label artwork layout xxxxxx product code mfg. date code revision level ymdx rev. model number product code oki-78sr-3.3/1.5-w36-c i33115 oki-78sr-5/1.5-w36-c i50115 oki-78sr-3.3/1.5-w36h-c i33115h oki-78sr-5/1.5-w36h-c i50115h maximum rated output in volts - 1.5 / 3.3 - c rohs-6 hazardous substance compliance 78sr series 78sr okami non-isolated pol oki - maximum rated output current in amps note: some model number combinations may not be available. contact murata power solutions. h blank: vertical mount h suf? x: horizontal mount w36 input voltage range 7-36v mdc_oki-78sr-w36.a06 p age 2 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support
performance and functional speci? cations all speci? cations are typical unless noted. see note 1 input input voltage range see ordering guide. recommended external fuse 2 amps fast blow reverse polarity protection (note 9) none. install an external fuse. isolation (note 5) not isolated. the input and output share a common return. start-up voltage na undervoltage shutdown (note 13) na overvoltage shutdown none internal input filter type capacitive input current: full load conditions see ordering guide inrush transient 0.16 a 2 sec. shutdown mode (off, uv, ot) 1 ma output in short circuit 5 ma no load 5 ma low line (vin=vmin, vout=nom) 0.8 amps (oki-78sr-3.3/1.5-w36) 1.16 amps (oki-78sr-5/1.5-w36) re? ected (back) ripple current (note 2) 10 ma pk-pk (oki-78sr-3.3/1.5-w36) 49 ma pk-pk (oki-78sr-5/1.5-w36) output output voltage see ordering guide output current range 0 to 1.5 amps minimum loading (note 12) no minimum load maximum output power 5.15 watts (oki-78sr-3.3/1.5-w36) 7.8 watts (oki-78sr-5/1.5-w36) accuracy (50% load) 4 % of vnom overvoltage protection (note 7) none temperature coef? cient 0.02% per c. of vout range ripple/noise (20 mhz bandwidth) see ordering guide and note 12 line/load regulation see ordering guide and note 10 ef? ciency see ordering guide and performance graphs maximum capacitive loading cap-esr=0.001 to 0.01 ohms 300 f cap-esr >0.01 ohms 3300 f current limit inception (98% of vout setting, after warm up) 3.5 amps short circuit mode (notes 6, 12) short circuit current output 10 ma protection method hiccup autorecovery upon overload removal. (note 8) short circuit duration continuous, no damage (output shorted to ground) prebias startup the converter will start up if the external output voltage is less than vnominal. dynamic characteristics dynamic load response (50% to 100% load step, no external caps) di/dt = 1 a/sec 25 sec settling time to within 2% of ? nal value peak deviation 100 mv switching frequency 500 khz environmental calculated mtbf (note 4) ambient temp. hours oki-78sr-3.3/1.5-w36-c telecordia method (4a) +25c 78,721,000 +40c 59,017,000 oki-78sr-3.3/1.5-w36-c mil-hdbk-217n2 method (4b) +25c 14,587,000 +40c 9,814,000 operating ambient temperature range full power, with derating [3] -40 to +85c. see derating curves. storage temperature range -55 to +125 c. relative humidity to 85%/+85 c. physical outline dimensions see mechanical speci? cations [11] weight 0.07 ounces (2 grams) safety certi? ed to ul/cul 60950-1 csa-c22.2 no. 60950-1 iec/en 60950-1, 2nd edition (pending) absolute maximum ratings input voltage, continuous or transient 36 v olts max. input reverse polarity protection none. install external fuse. output current current-limited. devices can withstand sustained short circuit without damage. storage temperature -40 to +125 deg. c. speci? cation notes: (1) all speci? cations are typical unless noted. general conditions for speci? cations are +25 deg.c ambient temperature, vin=nominal, vout=nominal, full rated load. adequate air? ow must be supplied for extended testing under power. see derating curves. all models are tested and speci? ed with no external 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, cbus=1000 f, lbus=1 h. all caps are low esr types. (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. all derating curves are presented near sea level altitude. be aware of reduced power dissipation with increasing altitude. (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 input and output are not isolated. they share a single common power and signal return. (6) short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. output current limit and short circuit protection are non-latching. when the overcurrent fault is removed, the converter will immediately recover. (7) the output is not intended to sink appreciable reverse current. (8) 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. (9) input fusing: if reverse polarity is accidentally applied to the input, to ensure reverse input protection, always connect an external input fast-blow fuse in series with the +vin input. use approximately twice the full input current rating with nominal input voltage. (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) caution: since the converter is mounted on the end by its pins, do not subject it to high vibration, shock or acceleration. (12) output noise may be further reduced by installing an external ? lter. do not exceed the maximum output capacitance. at zero output current and no external capacitor, the output may contain low frequency components which exceed the ripple speci? cation. the output may be operated inde? nitely with no load. (13) the input must remain above the undervoltage shutdown (uvlo) voltage speci? cation at all times to avoid an unplanned turn off. mdc_oki-78sr-w36.a06 p age 3 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support
mechanical specifications, vertical mount 0.05 (1.3) 0.200 (5.1) 0.205 (5.2) ref 0.100 (2.5) 0.06 (1.5) 0.30 (7.6) 0.16 (4.1) 0.13 (3.3) ref 0.0300.002 pin #1 over 75-150 u" nickel pin finish: pure matte tin 100-300 u" pin material: copper alloy pin #3 c l pin #1 0.41 (10.4) 0.65 (16.5) pin #1 input/output connections oki-78sr pin function 1 positive input 2 common (ground) 3 positive output 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? mdc_oki-78sr-w36.a06 p age 4 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support
mechanical specifications, horizontal mount .05 (1.3) .01 c l pin #3 pin #1 pin #1 over 75-150 u" nickel pin finish: pure matte tin 100-300 u" pin material: copper alloy pin #1 .01 .02 + - 0.17 (4.318) .025 (0.635) (3 pls) 0.200 (5.1) 0.205 (5.2) ref 0.100 (2.5) 0.06 (1.5) 0.30 (7.6) 0.16 (4.1) ref 0.41 (10.4) 0.65 (16.5) input/output connections oki-78sr pin function 1 positive input 2 common (ground) 3 positive output 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? mdc_oki-78sr-w36.a06 p age 5 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support
mdc_oki-78sr-w36.a06 p age 6 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support performance data C oki-78sr-3.3/1.5-w36 ef? ciency vs. line voltage and load current @ +25?c. (vout = vnom.) output ripple and noise (vin=7v, vout=nominal, iout=1.6a, cload=0, ta=+25?c., scopebw=100mhz) output ripple and noise (vin=36v, vout=nominal, iout=1.6a, cload=0, ta=+25?c., scopebw=100mhz) output ripple and noise (vin=12v, vout=nominal, iout=1.6a, cload=0, ta=+25?c., scopebw=100mhz) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 10 20 30 40 50 60 70 80 90 100 load curre nt (amps) ef?ciency (%) v in = 7v v in = 12v v in = 36v maximum current temperature derating at sea level (vin=7v. to 36v.) 0.00 1.00 2.00 20 25 30 35 40 45 50 55 60 65 70 75 80 85 ambient temperature (oc) output current (amps) 65 lfm
mdc_oki-78sr-w36.a06 p age 7 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support performance data C oki-78sr-3.3/1.5-w36 step load transient response (vin=36v, vout=nominal, cload=0, iout=0.75a to 1.5a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=12v, vout=nominal, cload=0, iout=0.75a to 1.5a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=7v, vout=nominal, cload=0, iout=0.75a to 1.5a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div step load transient response (vin=36v, vout=nominal, cload=0, iout=1.5a to 0.75a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=12v, vout=nominal, cload=0, iout=1.5a to 0.75a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=7v, vout=nominal, cload=0, iout=1.5a to 0.75a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div.
mdc_oki-78sr-w36.a06 p age 8 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support performance data C oki-78sr-5/1.5-w36 ef? ciency vs. line voltage and load current @ +25?c. (vout = vnom.) output ripple and noise (vin=7v, vout=nominal, iout=1.6a, cload=0, ta=+25?c., scopebw=100mhz) output ripple and noise (vin=36v, vout=nominal, iout=1.6a, cload=0, ta=+25?c., scopebw=100mhz) output ripple and noise (vin=12v, vout=nominal, iout=1.6a, cload=0, ta=+25?c., scopebw=100mhz) 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 0 10 20 30 40 50 60 70 80 90 100 load curre nt (amps) ef?ciency (%) v in = 7v v in = 12v v in = 36v maximum current temperature derating at sea level (vin=7v. to 36v.) 0.00 1.00 2.00 20 25 30 35 40 45 50 55 60 65 70 75 80 85 ambient temperature (oc) output current (amps) 65 lfm
mdc_oki-78sr-w36.a06 p age 9 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support performance data C oki-78sr-5/1.5-w36 step load transient response (vin=36v, vout=nominal, cload=0, iout=0.75a to 1.5a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=12v, vout=nominal, cload=0, iout=0.75a to 1.5a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=7v, vout=nominal, cload=0, iout=0.75a to 1.5a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=36v, vout=nominal, cload=0, iout=1.5a to 0.75a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=12v, vout=nominal, cload=0, iout=1.5a to 0.75a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div. step load transient response (vin=7v, vout=nominal, cload=0, iout=1.5a to 0.75a, slew=1a/s, ta=+25?c.) trace 2=vout, 100 mv/div. trace 4=iout, 0.5a/div.
soldering guidelines murata power solutions recommends the speci? cations below when installing these converters. these speci? cations vary dependin g on the solder type. exceeding these speci? ca- tions may cause damage to the product. be cautious when there is high atmospheric humidity. we strongly recommend a mild pre-ba ke (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: for sn/pb based solders: preheat temperature less than 1 oc. per second preheat temperature less than 1 oc. per second time over liquidus 45 to 75 seconds time over liquidus 60 to 75 seconds maximum peak temperature 260 oc. maximum peak temperature 235 oc. cooling rate less than 3 oc. per second cooling rate less than 3 oc. per second 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. for greatest safety, we recommend a fast blow fuse installed in the ungrounded input supply line. 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. input under-voltage shutdown and start-up threshold under normal start-up conditions, converters will not begin to regulate properly until the rising 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 operation 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 rising input voltage crosses the start-up threshold and the fully loaded regulated output voltage enters and remains within its speci? ed regulation 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. recommended input filtering the user must assure that the input source has low ac impedance to provide dynamic stability and that the input supply has little or no inductive content, including long distributed wiring to a remote power supply. the converter will operate with no additional external capacitance if these conditions are met. application notes for best performance, we recommend installing a low-esr capacitor immediately adjacent to the converters input terminals. the capacitor should be a ceramic type such as the murata grm32 series or a polymer type. initial suggested capacitor values are 10 to 22 f, rated at twice the expected maxi- mum input voltage. make sure that the input terminals do not go below the undervoltage shutdown voltage at all times. more input bulk capacitance may be added in parallel (either electrolytic or tantalum) if needed. recommended output filtering the converter will achieve its rated output ripple and noise with no additional external capacitor. however, the user may install more external output capaci- tance to reduce the ripple even further or for improved dynamic response. again, use low-esr ceramic (murata grm32 series) or polymer capacitors. initial values of 10 to 47 f may be tried, either single or multiple capacitors in parallel. mount these close to the converter. measure the output ripple under your load conditions. use only as much capacitance as required to achieve your ripple and noise objectives. excessive capacitance can make step load recovery sluggish or possibly introduce instability. do not exceed the maximum rated output capaci- tance listed in the speci? cations. 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 compo- nents, circuits and layout as shown in the ? gures below. the cbus and lbus components simulate a typical dc voltage bus. please note that the values of cin, lbus and cbus will vary according to the speci? c converter model. 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 mdc_oki-78sr-w36.a06 p age 10 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters www.murata-ps.com/support
in ? gure 3, the two copper strips simulate real-world printed circuit imped- ances 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 test circuit. 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. 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 previous 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 natural convection is de? ned as very ? ow rates which are not using fan-forced air? ow. depending on the application, natural convection is usually about 30-65 lfm but is not equal to still air (0 lfm). 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 near sea level altitude. be sure to reduce the derat- ing for higher altitude. 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 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 par- ticularly 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 bias voltage may shut down the pwm controller. following a time-out period, the pwm will restart, causing the output voltage to begin rising 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. 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) mdc_oki-78sr-w36.a06 p age 11 of 11 oki-78sr series fixed output 1.5 amp sip dc/dc converters 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. ? 2011 murata power solutions, inc. murata power solutions, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 u.s.a. iso 9001 and 14001 registered www.murata-ps.com/support

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