www.murata-ps.com OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs PRODUCT OVERVIEW The OKY-T/3 and -T/5 series are miniature non- frequency synchronous buck converter switching isolated Point-of-Load (POL) switch mode DC/DC topology, the high power conversion effi cient Point power converters for embedded applications. The of Load (POL) module features programmable module is fully compatible with Distributed-power output voltage and On/Off control. These converters Open Standards Alliance (DOSA) industry-standard also include under voltage lock out (UVLO), output specifi cations (www.dosapower.com). Applications short circuit protection, over-current and over include powering CPU’s, datacom/telecom systems, temperature protections. programmable logic and mixed voltage systems. These units are designed to meet all standard The wide input range is 2.4 to 5.5 Volts DC. Two UL/EN/IEC 60950-1 safety and FCC EMI/RFI TTyyppiiccaall uunniitt maximum output currents are offered, 3 Amps (T/3 emissions certifi cations and RoHS-6 hazardous models) or 5 Amps (T/5 models). Based on fi xed- substance compliance. FEATURES ■ Non-isolated SMT POL DC/DC power module ■ 2.4-5.5Vdc input voltage range ■ Programmable output voltage from 0.7525-3.63Vdc ■ 3 Amp (T/3) or 5 Amp (T/5) output current models Contents Page ■ Drives 1000 μF ceramic capacitive loads Description, Connection Diagram, Photograph 1 ■ High power conversion effi ciency at 96% Ordering Guide, Model Numbering, Product Label 2 Mechanical Specifi cations, Input/Output Pinout 3 ■ Outstanding thermal derating performance Detailed Electrical Specifi cations 4 ■ Over temperature and over current protection Output Voltage Adjustment, Soldering Guidelines 5 ■ On/Off control Technical Notes 6 ■ UL/EN/IEC 60950-1 safety OKY-T/3-W5 Performance Data and Oscillograms 9 OKY-T/5-W5 Performance Data and Oscillograms 13 ■ Industry-standard (DOSA) surface-mount package Tape and Reel Information 19 ■ RoHS-6 hazardous substance compliance Connection Diagram +Vin +Vout F1 (cid:116)(cid:1)(cid:52)(cid:88)(cid:74)(cid:85)(cid:68)(cid:73)(cid:74)(cid:79)(cid:72) On/Off Control (cid:116)(cid:1)(cid:39)(cid:74)(cid:77)(cid:85)(cid:70)(cid:83)(cid:84) Controller (cid:116)(cid:1)(cid:36)(cid:86)(cid:83)(cid:83)(cid:70)(cid:79)(cid:85)(cid:1)(cid:52)(cid:70)(cid:79)(cid:84)(cid:70) External Trim DC Power Open = On Reference and Source Closed = Off Error Amplifier (Positive On/Off) Common Common Figure 1. OKY-T/3, -T/5 Note: Murata Power Solutions strongly recommends an external input fuse, F1. See specifi cations. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 1 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs Performance Specifi cations Summaryand Ordering Guide ORDERING GUIDE Output Input Package IOUT R/N (mVp-p)➄ Regulation (Max.)➂ IIN, IIN, Effi ciency VOUT (Amps Power VIN Nom. Range no load full load Root Model ➁ (Volts) max) (Watts) Max. Line Load (Volts) (Volts)  (mA) (Amps) Min. Typ. Case C72 ➀ Pinout 0.47 x 0.82 x 0.28 OKY-T/3-W5N-C 0.7525-3.63 3 9.9 20 ±0.2% ±1.5% 5 2.4-5.5 45 2.1 92% 94.4% P78 (11.9 x 20.8 x 7.0) 0.47 x 0.82 x 0.28 OKY-T/3-W5P-C 0.7525-3.63 3 9.9 20 ±0.2% ±1.5% 5 2.4-5.5 45 2.1 92% 94.4% P78 (11.9 x 20.8 x 7.0) 0.47 x 0.82 x 0.28 OKY-T/5-W5N-C 0.7525-3.63 5 16.5 20 ±0.2% ±1% 5 2.4-5.5 35 3.5 92% 96% P78 (11.9 x 20.8 x 7.0) 0.47 x 0.82 x 0.28 OKY-T/5-W5P-C 0.7525-3.63 5 16.5 20 ±0.2% ±1% 5 2.4-5.5 35 3.5 92% 96% P78 (11.9 x 20.8 x 7.0) ➀ Dimensions are in inches (mm). Vin must be 0.5V or higher than Vout. ➁ These are partial model numbers. Please refer to the part number structure for complete ordering part numbers. Ripple and Noise is shown at Vout=1V. ➂ All specifications are at nominal line voltage, Vout=nominal (3.3V) and full load, +25 ˚C. unless otherwise noted. Output capacitors are 1 μF ceramic and 10 μF electrolytic in parallel. Input cap is 22 μF. See detailed specifications. I/O caps are necessary for our test equipment and may not be needed for your application. PART NUMBER STRUCTURE OK Y - T / 3 -W5 N - C Okami Non-isolated PoL RoHS Hazardous Substance Compliance C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder) Surface Mount On/Off Polarity P = Positive Polarity N = Negative Polarity Trimmable Output Voltage Range 0.75-3.63V Note: Some model number combinations may not be available. Contact Murata Input Voltage Range Power Solutions for availability. 2.4-5.5V Maximum Rated Output Current in Amps Product Label Because of the small size of these products, the product label contains a Model Number Product Code character-reduced code to indicate the model number and manufacturing date OKY-T/3-W5N-C Y00003 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: OKY-T/3-W5P-C Y01003 OKY-T/5-W5N-C Y00005 OKY-T/5-W5P-C Y01005 Y01003 Product code Mfg. The manufacturing date code is four characters: date YMDX Rev. Revision level code First character – Last digit of manufacturing year, example 2009 Figure 2. Label Artwork Layout Second character – Month code (1 through 9 and O through D) Third character – Day code (1 through 9 = 1 to 9, 10 = O and The label contains three rows of information: 11 through 31 = A through Z) Fourth character – Manufacturing information First row – Murata Power Solutions logo Second row – Model number product code (see table) Third row – Manufacturing date code and revision level www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 2 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs MECHANICAL SPECIFICATIONS TOP VIEW PIN #1 THIS CORNER (FARSIDE) 11.9 0.47 ISOMETRIC VIEW PIN #1 10.67 5.64 0.420 0.222 REF NOZZLE REF PICKUP 20.8 INPUT/OUTPUT CONNECTIONS POINT 0.82 OKY-T/3, -T/5 Pin Function SIDE VIEW END VIEW 1 On/Off Control* 2 +VIN 3 Ground (Common) 7.0 4 Trim 0.28 5 +VOUT MTG PLANE *The Remote On/Off can be provided with either positive (P suffi x) or negative (N 1.59 suffi x) polarity 0.063 Dimensions are in inches (mm shown for ref. only). Third Angle Projection BOTTOM VIEW 1.5 2.29 1.59 0.090 0.06 Tolerances (unless otherwise specified): 0.063 TYP .XX ± 0.02 (0.5) 3 4 5 .XXX ± 0.010 (0.25) TYP Angles ± 1˚ Components are shown for reference only. 8.63 1.8 0.340 0.07 1 [20.8] 0.82 REF 2 [2.41] 0.095 MIN [3.05] 0.120 MIN [2.79] 0.110 MAX [3.43] 0.135 MAX 0.25 4.57 0.010 0.180 8.63 [11.9] [8.63] 0.340 0.47 0.340 REF 12.69 0.500 17.52 [1.8] [4.57] 0.070 0.180 0.690 REF [1.52] [8.63] 0.06 0.340 [1.52] [12.69] MATERIAL: 0R.0E6F0 0.500 SMT PINS: COPPER ALLOY [17.52] 0.690 FINISH: (ALL PINS) RECOMMENDED PAD LAYOUT GOLD (5u"MIN) OVER NICKEL (50u" MIN) www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 3 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs Performance and Functional Specifi cations See Note 1 Input Environmental Input Voltage Range See Ordering Guide and Note 7. Calculated MTBF Isolation Not isolated Telecordia method (4a) OKY-T/3-W5N-C: 10,961,200 hours OKY-T/3-W5P-C: 10,830,600 hours Start-Up Voltage 2.05 V OKY-T/5-W5N-C: 9,893,917 hours Undervoltage Shutdown (see Note 15) 1.90 V OKY-T/5-W5P-C: 9,765,731 hours Overvoltage Shutdown None Calculated MTBF Refl ected (Back) Ripple Current (Note 2) 20 mA pk-pk MIL-HDBK-217N2 method (4b) OKY-T/3-W5N-C: 8,398,873 hours OKY-T/3-W5P-C: 8,228,758 hours Internal Input Filter Type Capacitive OKY-T/5-W5N-C: 8,338,304 hours Recommended External Fuse 6A OKY-T/5-W5P-C: 8,170,610 hours Reverse Polarity Protection N/A. See fuse information. Operating Temperature Range (Ambient, vertical mount) Input Current: See derating curves -40 to +85 ˚C. with derating (Note 9) Full Load Conditions See Ordering Guide Operating PC Board Temperature -40 to +100 ˚Celsius max., no derating (12) Inrush Transient 0.4 A2Sec. Storage Temperature Range -55 to +125 deg. C. Shutdown Mode (Off, UV, OT) 5 mA Thermal Protection/Shutdown +130 ˚Celsius Output in Short Circuit 60 mA Low Line (Vin=Vmin) 2.66 A. (OKY-T/3-W5) Relative Humidity to 85%/+85 ˚C., non-condensing 4.41 A. (OKY-T/5-W5) Remote On/Off Control (Note 5) Physical Negative Logic (“N” model suffi x) ON = Open pin or ground to +0.4V. max. Outline Dimensions See Mechanical Specifi cations OFF = +1.5V min. to +Vin Weight 0.1 ounces (2.8 grams) Current 1 mA max. Electromagnetic Interference Designed to meet FCC part 15, class B, Positive Logic (“P” model suffi x) ON = Open pin (internally pulled up) or EN55022 and CISPR22 class B conducted +7.8Vdc to +Vin max. and radiated (may need external fi lter) OFF = Ground pin to +0.4V. max. Safety Designed to meet UL/cUL 60950-1, CSA- Current 1 mA max. C22.2 No. 60950-1, IEC/EN 60950-1 Output Restriction of Hazardous Substances RoHS-6 (does not claim EU RoHS exemption Output Power 9.9W max. (OKY-T/3), 16.5W max. (OKY-T/5) 7b–lead in solder) Output Voltage Range See Ordering Guide MSL Rating 2 Minimum Loading No minimum load Absolute Maximum Ratings Accuracy (50% load, untrimmed) ±2 % of Vnominal Input Voltage (Continuous or transient) 0 V.to +5.8 Volts max. Voltage Output Range (Note 13) See Ordering Guide On/Off Control 0 V. min. to +Vin max. Overvoltage Protection (Note 16) None Input Reverse Polarity Protection See Fuse section Temperature Coeffi cient ±0.02% per °C of Vout range Output Current (Note 7) Current-limited. Devices can withstand a Ripple/Noise (20 MHz bandwidth) See Ordering Guide and note 8 sustained short circuit without damage. Line/Load Regulation See Ordering Guide and note 10 The outputs are not intended to accept appreciable reverse current. Effi ciency See Ordering Guide Storage Temperature -55 to +125 ˚C. Maximum Capacitive Loading (Note 14) Cap-ESR=0.001 to 0.01 Ohms 1,000 μF Lead Temperature See soldering specifi cations Cap-ESR >0.01 Ohms 3,000 μF 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 Current Limit Inception (Note 6) under conditions other than those listed in the Performance/Functional Specifi cations (98% of Vout setting, after warm up) 5 Amps Table is not implied nor recommended. Short Circuit Mode Short Circuit Current Output 2 A Specifi cation Notes: Protection Method Hiccup autorecovery upon overload removal. (Note 17) (1) Specifi cations are typical at +25 °C, Vin=nominal (+5V.), Vout=nominal (+3.3V), full load, external caps and natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced Short Circuit Duration Continuous, no damage airfl ow. (output shorted to ground) All models are tested and specifi ed with external 1 μF paralleled with 10μF ceramic/tantalum output Prebias Startup Converter will start up if the external capacitors and a 22 μF external input capacitor. All capacitors are low ESR types. These capacitors are output voltage is less than Vnominal. necessary to accommodate our test equipment and may not be required to achieve specifi ed performance in your applications. However, Murata Power Solutions recommends installation of these capacitors. All Dynamic Characteristics models are stable and regulate within spec under no-load conditions. Dynamic Load Response 90μSec max. to within ±2% of fi nal value (2) Input Back Ripple Current is tested and specifi ed over a 5 Hz to 20 MHz bandwidth. Input fi ltering is Cin=2 x (50-100-50% load step, di/dt=2.5A/μSec) 100 μF tantalum, Cbus=1000 μF electrolytic, Lbus=1 μH. (3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher Start-Up Time 8 mSec for Vout=nominal (Vin On) temperatures and/or lower airfl ow, the DC/DC converter will tolerate brief full current outputs if the total (Vin on or On/Off to Vout regulated) 6 mSec for Vout=nominal (Remote On/Off) RMS current over time does not exceed the Derating curve. Switching Frequency 300 KHz (4a) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fi 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. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 4 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs Specifi cation Notes, Cont.: Soldering Guidelines (5) The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced Murata Power Solutions recommends the specifi cations below when installing these to -Input Common. A logic gate may also be used by applying appropriate external voltages which do not exceed +Vin. converters. These specifi cations vary depending on the solder type. Exceeding these (6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected specifi cations may cause damage to the product. Your production environment setting. may differ therefore please thoroughly review these guidelines with your process (7) For W5 models, the Input Voltage must exceed the Output Voltage at all times by 0.5 Volts or greater. engineers. (8) Output noise may be further reduced by adding an external fi lter. At zero output current, the output may contain low frequency components which exceed the ripple specifi cation. The output may be operated indefi nitely with no load. (9) All models are fully operational and meet published specifi cations, including “cold start” at –40˚ C. Reflow Solder Operations for surface-mount products (SMT) (10) Regulation specifi cations describe the deviation as the line input voltage or output load current is varied For Sn/Ag/Cu based solders: from a nominal midpoint value to either extreme. (11) Other input or output voltage ranges will be reviewed under scheduled quantity special order. Preheat Temperature Less than 1 ºC. per second (12) Maximum PC board temperature is measured with the sensor in the center of the converter. Time over Liquidus 45 to 75 seconds (13) Do not exceed maximum power specifi cations when adjusting the output trim. (14) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external Maximum Peak Temperature 260 ºC. output capacitor and, to a lesser extent, the distance and series impedance to the load. Larger caps will Cooling Rate Less than 3 ºC. per second 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 For Sn/Pb based solders: refer to the Output Capacitive Load Application Note. Preheat Temperature Less than 1 ºC. per second (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 Time over Liquidus 60 to 75 seconds attempt to recover when the input is brought back into normal operating range. (16) The outputs are not intended to sink appreciable reverse current. Maximum Peak Temperature 235 ºC. (17) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. Cooling Rate Less than 3 ºC. per second 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 Recommended Lead-free Solder Refl ow Profi le immediately recovers normal operation. Output Voltage Adustment 250 Peak Temp. 235-260° C 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 200 resistor must be a 1/10 Watt precision metal fi lm type, ±1% accuracy or better with low temperature coeffi cient, ±100 ppm/oC. or better. Mount the rtreismis rteosr icsltoosr.e to the converter with very short leads or use a surface mount Temperature (°C)110500 S1o2a0k isnegc Zmoanxe timRee 4afl5bo-ow7v5 eZ so2en1ce7° C In the tables below, the calculated resistance is given. Do not exceed the <1.5° C/sec High trace = normal upper limit specifi ed limits of the output voltage or the converter’s maximum power Preheating Zone Low trace = normal lower limit 50 rating when applying these resistors. Also, avoid high noise at the Trim 240 sec max input. However, to prevent instability, you should never connect any capaci- 0 tors to Trim. 0 30 60 90 120 150 180 210 240 270 300 Time (sec) High trace = normal upper limit OKY-T/3-W5, -T/5-W5 Low trace - normal lower limit Output Voltage Calculated Rtrim (KΩ) 3.3 V. 3.160 2.5 V. 6.947 2.0 V. 11.780 1.8 V. 15.004 1.5 V. 23.077 1.2 V. 41.973 1.0 V. 80.021 0.7525 V. ∞ (open) Resistor Trim Equation, W5 models: RTRIM () = _____2_1_0_7_0____ – 5110 VOUT – 0.7525V www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 5 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs For best performance, we recommend installing a low-ESR capacitor TECHNCIAL NOTES immediately adjacent to the converter’s input terminals. The capacitor should Input Fusing be a ceramic type such as the Murata GRM32 series or a polymer type. Initial Certain applications and/or safety agencies may require fuses at the inputs of suggested capacitor values are 10 to 22 μF, rated at twice the expected maxi- power conversion components. Fuses should also be used when there is the mum input voltage. Make sure that the input terminals do not go below the possibility of sustained input voltage reversal which is not current-limited. We undervoltage shutdown voltage at all times. More input bulk capacitance may recommend a time delay fuse installed in the ungrounded input supply line be added in parallel (either electrolytic or tantalum) if needed. with a value which is approximately twice the maximum line current, calcu- Recommended Output Filtering lated at the lowest input voltage. The converter will achieve its rated output ripple and noise with no additional The installer must observe all relevant safety standards and regulations. For external capacitor. However, the user may install more external output capaci- safety agency approvals, install the converter in compliance with the end-user tance to reduce the ripple even further or for improved dynamic response. safety standard, i.e. IEC/EN/UL 60950-1. Again, use low-ESR ceramic (Murata GRM32 series) or polymer capacitors. Initial values of 10 to 47 μF may be tried, either single or multiple capacitors in Input Under-Voltage Shutdown and Start-Up Threshold parallel. Mount these close to the converter. Measure the output ripple under Under normal start-up conditions, converters will not begin to regulate properly your load conditions. until the ramping-up input voltage exceeds and remains at the Start-Up Threshold Voltage (see Specifi cations). Once operating, converters will not Use only as much capacitance as required to achieve your ripple and noise turn off until the input voltage drops below the Under-Voltage Shutdown Limit. objectives. Excessive capacitance can make step load recovery sluggish or Subsequent restart will not occur until the input voltage rises again above the possibly introduce instability. Do not exceed the maximum rated output capaci- Start-Up Threshold. This built-in hysteresis prevents any unstable on/off opera- tance listed in the specifi cations. tion at a single input voltage. Input Ripple Current and Output Noise Users should be aware however of input sources near the Under-Voltage All models in this converter series are tested and specifi ed for input refl ected Shutdown whose voltage decays as input current is consumed (such as ripple current and output noise using designated external input/output compo- capacitor inputs), the converter shuts off and then restarts as the external nents, circuits and layout as shown in the fi gures below. In the fi gure below, capacitor recharges. Such situations could oscillate. To prevent this, make the Cbus and Lbus components simulate a typical DC voltage bus. Please sure the operating input voltage is well above the UV Shutdown voltage AT ALL note that the values of Cin, Lbus and Cbus will vary according to the specifi c TIMES. converter model. Start-Up Time Assuming that the output current is set at the rated maximum, the Vin to Vout TO Start-Up Time (see Specifi cations) is the time interval between the point when OSCILLOSCOPE CURRENT the ramping input voltage crosses the Start-Up Threshold and the fully loaded PROBE +INPUT regulated output voltage enters and remains within its specifi ed accuracy band. Actual measured times will vary with input source impedance, external input + LBUS caapppaecairtsa nact eth, ein pcount vveorlttaerg.e slew rate and fi nal value of the input voltage as it VIN +– CBUS CIN – These converters include a soft start circuit to moderate the duty cycle of its -INPUT PWM controller at power up, thereby limiting the input inrush current. CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz The On/Off Remote Control interval from On command to Vout regulated CBUS = 1000μF, ESR < 100mΩ @ 100kHz assumes that the converter already has its input voltage stabilized above the LBUS = 1μH Start-Up Threshold before the On command. The interval is measured from the On command until the output enters and remains within its specifi ed accuracy Figure 3. Measuring Input Ripple Current band. The specifi cation assumes that the output is fully loaded at maximum rated current. Similar conditions apply to the On to Vout regulated specifi cation In fi gure 4, the two copper strips simulate real-world printed circuit imped- such as external load capacitance and soft start circuitry. ances between the power supply and its load. In order to minimize circuit errors and standardize tests between units, scope measurements should be Recommended Input Filtering made using BNC connectors or the probe ground should not exceed one half- The user must assure that the input source has low AC impedance to provide inch and soldered directly to the test circuit. 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. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 6 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs CAUTION: If you routinely or accidentally exceed these Derating guidelines, the converter may have an unplanned Over Temperature shut down. Also, these COPPER STRIP graphs are all collected at slightly above Sea Level altitude. Be sure to reduce +OUTPUT the derating for higher density altitude. Output Fusing C1 C2 SCOPE RLOAD The converter is extensively protected against current, voltage and temperature extremes. However your output application circuit may need additional protec- -OUTPUT 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 COPPER STRIP with the output. Output Current Limiting C1 = 0.1μF CERAMIC C2 = 10μF TANTALUM Current limiting inception is defi ned as the point at which full power falls below LOAD 2-3 INCHES (51-76mm) FROM MODULE the rated tolerance. See the Performance/Functional Specifi cations. Note par- Figure 4. Measuring Output Ripple and Noise (PARD) ticularly that the output current may briefl y rise above its rated value in normal operation as long as the average output power is not exceeded. This enhances Minimum Output Loading Requirements reliability and continued operation of your application. If the output current is All models regulate within specifi cation and are stable under no load to full too high, the converter will enter the short circuit condition. load conditions. Operation under no load might however slightly increase output ripple and noise. Output Short Circuit Condition When a converter is in current-limit mode, the output voltage will drop as the Thermal Shutdown output current demand increases. If the output voltage drops too low (approxi- To prevent many over temperature problems and damage, these converters mately 98% of nominal output voltage for most models), the magnetically include thermal shutdown circuitry. If environmental conditions cause the coupled voltage used to develop primary side voltages will also drop, thereby temperature of the DC/DC’s to rise above the Operating Temperature Range shutting down the PWM controller. Following a time-out period, the PWM will up to the shutdown temperature, an on-board electronic temperature sensor restart, causing the output voltage to begin ramping up to its appropriate value. will power down the unit. When the temperature decreases below the turn-on If the short-circuit condition persists, another shutdown cycle will initiate. This threshold, the converter will automatically restart. There is a small amount of rapid on/off cycling is called “hiccup mode”. The hiccup cycling reduces the hysteresis to prevent rapid on/off cycling. average output current, thereby preventing excessive internal temperatures and/or component damage. A short circuit can be tolerated indefi nitely. 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- The “hiccup” system differs from older latching short circuit systems tion to avoid unplanned thermal shutdown. 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- Temperature Derating Curves tion is removed. The graphs in this data sheet illustrate typical operation under a variety of conditions. The Derating curves show the maximum continuous ambient air Remote On/Off Control temperature and decreasing maximum output current which is acceptable On the input side, a remote On/Off Control can be ordered with either polarity. under increasing forced airfl ow measured in Linear Feet per Minute (“LFM”). Please refer to the Connection Diagram on page 1 for On/Off connections. Note that these are AVERAGE measurements. The converter will accept brief Positive polarity models are enabled when the On/Off pin is left open or is increases in current or reduced airfl ow as long as the average is not exceeded. pulled high to +Vin with respect to –Vin. Positive-polarity devices are disabled Note that the temperatures are of the ambient airfl ow, not the converter when the On/Off is grounded or brought to within a low voltage (see Specifi ca- itself which is obviously running at higher temperature than the outside air. tions) with respect to –Vin. Also note that very low fl ow rates (below about 25 LFM) are similar to “natural Negative polarity devices are on (enabled) when the On/Off pin is left open convection”, that is, not using fan-forced airfl ow. or brought to within a low voltage (see Specifi cations) with respect to –Vin. The Murata Power Solutions makes Characterization measurements in a closed device is off (disabled) when the On/Off is pulled high (see Specifi cations) with cycle wind tunnel with calibrated airfl ow. We use both thermocouples and an respect to –Vin. infrared camera system to observe thermal performance. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 7 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs Dynamic control of the On/Off function should be able to sink appropriate Output Capacitive Load signal current when brought low and withstand appropriate voltage when These converters do not require external capacitance added to achieve rated brought high. Be aware too that there is a fi nite time in milliseconds (see specifi cations. Users should only consider adding capacitance to reduce Specifi cations) between the time of On/Off Control activation and stable, switching noise and/or to handle spike current load steps. Install only enough regulated output. This time will vary slightly with output load type and current capacitance to achieve noise objectives. Excess external capacitance may and input conditions. cause regulation problems, degraded transient response and possible oscilla- tion or instability. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 8 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.2V) OKY-T/3-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.2V) OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 90 3.5 80 3.0 70 Natural convection y (%) 60 VVIINN == 55V.5V mps) 2.5 Efficienc 345000 VIN = 2.4V Output Current (A 12..50 1.0 20 10 0.5 0 0.0 0 0.5 1 1.5 2 2.5 3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Load Current (Amps) Ambient Temperature (ºC) On/Off Enable Startup (Vin=5.5V, Vout=1.2V, Iout=3A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=1.2V, Iout=3A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=1.5A to 3A) Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=3A to 1.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 9 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.5V) OKY-T/3-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.5V) OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 3.5 3.0 %) 80 VIN = 5.5V Natural convection Efficiency ( 4600 VVIINN == 52V.4V Output Current (Amps) 122...505 20 1.0 0.5 0 0 0.5 1 1.5 2 2.5 3 3.5 0.0 Load Current (Amps) 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (ºC) On/Off Enable Startup (Vin=5.5V, Vout=1.5V, Iout=3A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=1.5V, Iout=3A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=1.5A to 3A) Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=3A to 1.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 10 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/3-W5 PERFORMANCE DATA (Vout = 1.8V) OKY-T/3-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.8V) OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 3.5 3.0 %) 80 VIN = 5.5V Natural convection y ( VIN = 5V 2.5 Efficienc 4600 VIN = 2.4V Output Current (Amps) 12..50 20 1.0 0.5 0 0 0.5 1 1.5 2 2.5 3 3.5 0.0 Load Current (Amps) 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (ºC) On/Off Enable Startup (Vin=5.5V, Vout=1.8V, Iout=3A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=1.8V, Iout=3A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=1.5A to 3A) Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=3A to 1.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 11 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/3-W5 PERFORMANCE DATA (Vout = 2.5V) OKY-T/3-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 2.5V) OKY-T/3-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 3.5 95 3.0 90 Natural convection %) VIN = 5.5V 2.5 y ( 85 VIN = 5V mps) Efficienc 7850 VIN = 3V Output Current (A 12..50 1.0 70 0.5 65 0.0 0 0.5 1 1.5 2 2.5 3 3.5 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Load Current (Amps) Ambient Temperature (ºC) On/Off Enable Startup (Vin=5.5V, Vout=2.5V, Iout=3A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=2.5V, Iout=3A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=1.5A to 3A) Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=3A to 1.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 12 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/3-W5 PERFORMANCE DATA (Vout = 3.3V) On/Off Enable Startup (Vin=5.5V, Vout=3.3V, Iout=3A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=3.3V, Iout=3A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=1.5A to 3A) Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=3A to 1.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 1A/div. OKY-T/5-W5 PERFORMANCE DATA (Vout = 1V) OKY-T/5-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 1V) OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 90 80 5.0 Natural convection 70 Efficiency (%) 34560000 VVVIIINNN === 552.V.54VV Output Current (Amps) 234...000 1.0 20 0 10 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 0 Ambient Temperature (ºC) 0 1 2 3 4 5 6 Load Current (Amps) www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 13 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.2V) OKY-T/5-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.2V) OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 5.0 %) 80 VIN = 5.5V Natural convection ncy ( 60 VVIINN == 52V.4V mps) 4.0 Efficie 40 Output Current (A 23..00 20 1.0 0 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 0 1 2 3 4 5 6 Ambient Temperature (ºC) Load Current (Amps) On/Off Enable Startup (Vin=5.5V, Vout=1.2V, Iout=5A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=1.2V, Iout=5A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=2.5A to 5A) Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=0, Iout=5A to 2.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 14 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.5V) OKY-T/5-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.5V) OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 5.0 %) 80 VIN = 5.5V Natural convection ncy ( 60 VVIINN == 52V.4V mps) 4.0 Efficie 40 Output Current (A 23..00 1.0 20 0 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 0 1 2 3 4 5 6 Ambient Temperature (ºC) Load Current (Amps) On/Off Enable Startup (Vin=5.5V, Vout=1.5V, Iout=5A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=1.5V, Iout=5A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=2.5A to 5A) Step Load Transient Response (Vin=5V, Vout=1.5V, Cload=0, Iout=5A to 2.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 15 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/5-W5 PERFORMANCE DATA (Vout = 1.8V) OKY-T/5-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 1.8V) OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 5.0 %) 80 VIN = 5.5V Natural convection ncy ( 60 VVIINN == 52V.4V mps) 4.0 Efficie 40 Output Current (A 23..00 1.0 20 0 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 0 1 2 3 4 5 6 Ambient Temperature (ºC) Load Current (Amps) On/Off Enable Startup (Vin=5.5V, Vout=1.8V, Iout=5A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=1.8V, Iout=5A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=2.5A to 5A) Step Load Transient Response (Vin=5V, Vout=1.8V, Cload=0, Iout=5A to 2.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 16 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/5-W5 PERFORMANCE DATA (Vout = 2.5V) OKY-T/5-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 2.5V) OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 95 5.0 Natural convection 90 Efficiency (%) 788505 VVVIIINNN === 553.VV5V Output Current (Amps) 234...000 1.0 70 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (ºC) 65 0 1 2 3 4 5 6 Load Current (Amps) On/Off Enable Startup (Vin=5.5V, Vout=2.5V, Iout=5A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=2.5V, Iout=5A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=2.5A to 5A) Step Load Transient Response (Vin=5V, Vout=2.5V, Cload=0, Iout=5A to 2.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 17 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs OKY-T/5-W5 PERFORMANCE DATA (Vout = 3.3V) OKY-T/5-W5 Effi ciency vs. Line Voltage and Load Current @ 25°C (VOUT = 3.3V) OKY-T/5-W5 Maximum Current Temperature Derating at Sea Level (VIN = 3.3 to 5V, VOUT = 0.75 to 3.3V, VIN>VOUT + 0.5V) 100 95 5.0 Natural convection 90 Efficiency (%) 788505 VVVIIINNN === 553.V.58VV Output Current (Amps) 234...000 1.0 70 0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 65 Ambient Temperature (ºC) 0 1 2 3 4 5 6 Load Current (Amps) On/Off Enable Startup (Vin=5.5V, Vout=3.3V, Iout=5A, Cload=0) Output Ripple and Noise (Vin=5V, Vout=3.3V, Iout=5A, Cload=0, ScopeBW=100MHz) Trace 4=Enable, Trace2=Vout Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=2.5A to 5A) Step Load Transient Response (Vin=5V, Vout=3.3V, Cload=0, Iout=5A to 2.5A) Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2A/div. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 18 of 19

OKY T/3, T/5-W5 Series Adjustable Output 3 and 5-Amp DOSA-SMT PoLs TAPE AND REEL INFORMATION 2.33 16.00 0.092 0.630 (P/U) 6.86 4.00 ROUND 0.270 0.157 HOLES 22.25 0.876 (P/U) 44.00 40.40 1.732 1.591 2.00 OBLONG 0.079 HOLES FEED (UNWIND) Dimensions are in inches (mm shown for ref. only). DIRECTION ------- Third Angle Projection TOP COVER TAPE Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 1˚ Components are shown for reference only. 5.64 PIN #1 THIS 0.222 101.6 44.0 CORNER REF 4.00 1.73 (FARSIDE) (CORE) REF 10.67 0.420 20.8 330.2 0.82 13.00 REF PICKUP NOZZLE LOCATION ( 3-6mm) 13.00 11.9 .512 0.47 REF REEL INFORMATION PICK & PLACE PICKUP (P/U) (400 UNITS PER REEL) This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A. Refer to: http://www.murata-ps.com/requirements/ ISO 9001 and 14001 REGISTERED 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 herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without notice. © 2012 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_OKY-T/3,T/5-W5 Series.A12 Page 19 of 19

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: M urata: OKY-T/3-W5P-C OKY-T/5-W5P-C OKY-T/5-W5N-C OKY-T/3-W5N-C