OKY T/3, T/5-W5 Series www.murata-ps.com Adjustable Output 3 and 5-Amp DOSA-SMT PoLs PRODUCT OVERVIEW The OKY-T/3 and -T/5 series are miniature nonisolated 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 specifications (www.dosapower.com). Applications include powering CPU’s, datacom/telecom systems, programmable logic and mixed voltage systems. The wide input range is 2.4 to 5.5 Volts DC. Two maximum output currents are offered, 3 Amps (T/3 models) or 5 Amps (T/5 models). Based on fixed- Typical unit frequency synchronous buck converter switching topology, the high power conversion efficient 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 certifications and RoHS-6 hazardous 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 ■ Drives 1000 μF ceramic capacitive loads ■ High power conversion efficiency at 96% ■ 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 ■ RoHS-6 hazardous substance compliance Contents Description, Connection Diagram, Photograph Ordering Guide, Model Numbering, Product Label Mechanical Specifications, Input/Output Pinout Detailed Electrical Specifications Output Voltage Adjustment, Soldering Guidelines Technical Notes OKY-T/3-W5 Performance Data and Oscillograms OKY-T/5-W5 Performance Data and Oscillograms Tape and Reel Information Page 1 2 3 4 5 6 9 13 19 Connection Diagram +Vin F1 +Vout t4XJUDIJOH On/Off Control Controller t'JMUFST t$VSSFOU4FOTF External DC Power Source Trim Reference and Error Amplifier Open = On Closed = Off (Positive On/Off) Common Common Figure 1. OKY-T/3, -T/5 Note: Murata Power Solutions strongly recommends an external input fuse, F1. See specifications. 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 Specifications Summaryand Ordering Guide ORDERING GUIDE Output Root Model ➁ VOUT (Volts) Input Package R/N (mVp-p)➄ Regulation (Max.)➂ IOUT IIN, IIN, (Amps Power VIN Nom. Range no load full load max) (Watts) Max. Line Load (Volts) (Volts) (mA) (Amps) Efficiency Min. Typ. 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% 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% 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% 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% ➀ Dimensions are in inches (mm). ➁ These are partial model numbers. Please refer to the part number structure for complete ordering part numbers. Case C72 ➀ Pinout 0.47 x 0.82 x 0.28 (11.9 x 20.8 x 7.0) 0.47 x 0.82 x 0.28 (11.9 x 20.8 x 7.0) 0.47 x 0.82 x 0.28 (11.9 x 20.8 x 7.0) 0.47 x 0.82 x 0.28 (11.9 x 20.8 x 7.0) P78 P78 P78 P78 Vin must be 0.5V or higher than Vout. 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 Surface Mount Trimmable Output Voltage Range 0.75-3.63V RoHS Hazardous Substance Compliance C = RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder) On/Off Polarity P = Positive Polarity N = Negative Polarity Input Voltage Range 2.4-5.5V Note: Some model number combinations may not be available. Contact Murata Power Solutions for availability. Maximum Rated Output Current in Amps 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 differs from the product photograph on page 1. Here is the layout of the label: Mfg. date code Y01003 Product code YMDX Rev. Revision level Figure 2. Label Artwork Layout The label contains three rows of information: First row – Murata Power Solutions logo Second row – Model number product code (see table) Third row – Manufacturing date code and revision level Model Number Product Code OKY-T/3-W5N-C Y00003 OKY-T/3-W5P-C Y01003 OKY-T/5-W5N-C Y00005 OKY-T/5-W5P-C Y01005 The manufacturing date code is four characters: First character – Last digit of manufacturing year, example 2009 Second character – Month code (1 through 9 and O through D) Third character – Day code (1 through 9 = 1 to 9, 10 = O and 11 through 31 = A through Z) Fourth character – Manufacturing information 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 10.67 0.420 REF NOZZLE PICKUP POINT PIN #1 5.64 0.222 REF 20.8 0.82 INPUT/OUTPUT CONNECTIONS OKY-T/3, -T/5 SIDE VIEW END VIEW 7.0 0.28 MTG PLANE Pin 1 2 3 4 5 Function On/Off Control* +VIN Ground (Common) Trim +VOUT *The Remote On/Off can be provided with either positive (P suffix) or negative (N suffix) polarity 1.59 0.063 Dimensions are in inches (mm shown for ref. only). Third Angle Projection BOTTOM VIEW 1.59 0.063 TYP 2.29 0.090 TYP 1.5 0.06 3 4 Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) Angles ± 1˚ 5 Components are shown for reference only. 1 8.63 0.340 [20.8] 0.82 REF [2.41] 0.095 MIN [2.79] 0.110 MAX 2 0.25 0.010 1.8 0.07 [3.05] 0.120 MIN [3.43] 0.135 MAX 4.57 0.180 8.63 0.340 [11.9] 0.47 REF [8.63] 0.340 12.69 0.500 17.52 0.690 MATERIAL: SMT PINS: COPPER ALLOY FINISH: (ALL PINS) GOLD (5u"MIN) OVER NICKEL (50u" MIN) [4.57] 0.180 [1.8] 0.070 REF [1.52] 0.060 REF [8.63] 0.340 [1.52] 0.06 [12.69] 0.500 [17.52] 0.690 RECOMMENDED PAD LAYOUT 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 Specifications See Note 1 Input Input Voltage Range Isolation Start-Up Voltage Undervoltage Shutdown (see Note 15) Overvoltage Shutdown Reflected (Back) Ripple Current (Note 2) Internal Input Filter Type Recommended External Fuse Reverse Polarity Protection Input Current: Full Load Conditions Inrush Transient Shutdown Mode (Off, UV, OT) Output in Short Circuit Low Line (Vin=Vmin) Environmental See Ordering Guide and Note 7. Not isolated 2.05 V 1.90 V None 20 mA pk-pk Capacitive 6A N/A. See fuse information. Calculated MTBF Telecordia method (4a) Calculated MTBF MIL-HDBK-217N2 method (4b) Relative Humidity Safety Output Output Power Output Voltage Range Minimum Loading Accuracy (50% load, untrimmed) Voltage Output Range (Note 13) Overvoltage Protection (Note 16) Temperature Coefficient Ripple/Noise (20 MHz bandwidth) Line/Load Regulation Efficiency 9.9W max. (OKY-T/3), 16.5W max. (OKY-T/5) See Ordering Guide No minimum load ±2 % of Vnominal See Ordering Guide None ±0.02% per °C of Vout range See Ordering Guide and note 8 See Ordering Guide and note 10 See Ordering Guide Maximum Capacitive Loading (Note 14) Cap-ESR=0.001 to 0.01 Ohms Cap-ESR >0.01 Ohms 1,000 μF 3,000 μF Current Limit Inception (Note 6) (98% of Vout setting, after warm up) 5 Amps 2A Hiccup autorecovery upon overload removal. (Note 17) Continuous, no damage (output shorted to ground) Converter will start up if the external output voltage is less than Vnominal. Restriction of Hazardous Substances MSL Rating Dynamic Load Response 90μSec max. to within ±2% of final value (50-100-50% load step, di/dt=2.5A/μSec) 8 mSec for Vout=nominal (Vin On) 6 mSec for Vout=nominal (Remote On/Off) 300 KHz See Mechanical Specifications 0.1 ounces (2.8 grams) Designed to meet FCC part 15, class B, EN55022 and CISPR22 class B conducted and radiated (may need external filter) Designed to meet UL/cUL 60950-1, CSAC22.2 No. 60950-1, IEC/EN 60950-1 RoHS-6 (does not claim EU RoHS exemption 7b–lead in solder) 2 Absolute Maximum Ratings Input Voltage (Continuous or transient) On/Off Control Input Reverse Polarity Protection Output Current (Note 7) 0 V.to +5.8 Volts max. 0 V. min. to +Vin max. See Fuse section 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 specifications 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 Specifications Table is not implied nor recommended. Specification Notes: (1) Specifications 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 airflow. All models are tested and specified with external 1 μF paralleled with 10μF ceramic/tantalum output capacitors and a 22 μF 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 specified 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. Dynamic Characteristics Start-Up Time (Vin on or On/Off to Vout regulated) Switching Frequency to 85%/+85 ˚C., non-condensing Outline Dimensions Weight Electromagnetic Interference ON = Open pin or ground to +0.4V. max. OFF = +1.5V min. to +Vin 1 mA max. ON = Open pin (internally pulled up) or +7.8Vdc to +Vin max. OFF = Ground pin to +0.4V. max. 1 mA max. Current Prebias Startup 8,398,873 hours 8,228,758 hours 8,338,304 hours 8,170,610 hours Physical Current Positive Logic (“P” model suffix) Short Circuit Duration OKY-T/3-W5N-C: OKY-T/3-W5P-C: OKY-T/5-W5N-C: OKY-T/5-W5P-C: 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 See Ordering Guide 0.4 A2Sec. 5 mA 60 mA 2.66 A. (OKY-T/3-W5) 4.41 A. (OKY-T/5-W5) Remote On/Off Control (Note 5) Negative Logic (“N” model suffix) Short Circuit Mode Short Circuit Current Output Protection Method OKY-T/3-W5N-C: 10,961,200 hours OKY-T/3-W5P-C: 10,830,600 hours OKY-T/5-W5N-C: 9,893,917 hours OKY-T/5-W5P-C: 9,765,731 hours (2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x 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 temperatures and/or lower airflow, 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 fixed 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 Specification Notes, Cont.: Soldering Guidelines (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. (7) For W5 models, the Input Voltage must exceed the Output Voltage at all times by 0.5 Volts or greater. (8) Output noise may be further reduced by adding an external filter. At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load. (9) All models are fully operational and meet published specifications, including “cold start” at –40˚ C. Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these specifications may cause damage to the product. Your production environment may differ therefore please thoroughly review these guidelines with your process engineers. Reflow Solder Operations for surface-mount products (SMT) (10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a nominal midpoint value to either extreme. For Sn/Ag/Cu based solders: (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 Maximum Peak Temperature 260 ºC. Cooling Rate Less than 3 ºC. per second (13) Do not exceed maximum power specifications 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. For Sn/Pb based solders: (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. Preheat Temperature Less than 1 ºC. per second Time over Liquidus 60 to 75 seconds (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. 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. Cooling Rate Less than 3 ºC. per second In the tables below, the calculated resistance is given. Do not exceed the specified limits of the output voltage or the converter’s maximum power rating when applying these resistors. Also, avoid high noise at the Trim input. However, to prevent instability, you should never connect any capacitors to Trim. Peak Temp. 235-260° C 250 200 Temperature (°C) 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 film type, ±1% accuracy or better with low temperature coefficient, ±100 ppm/oC. or better. Mount the resistor close to the converter with very short leads or use a surface mount trim resistor. Recommended Lead-free Solder Reflow Profile Reflow Zone 150 Soaking Zone time above 217° C 45-75 sec 120 sec max 100 <1.5° C/sec High trace = normal upper limit Low trace = normal lower limit Preheating Zone 50 240 sec max 0 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 Output Voltage Low trace - normal lower limit 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: 21070 RTRIM () = _____________ – 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 TECHNCIAL NOTES 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, calculated 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 Specifications). 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 Specifications) 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 specified accuracy band. Actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it appears at the converter. For best performance, we recommend installing a low-ESR capacitor immediately adjacent to the converter’s 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 μF, rated at twice the expected maximum 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 capacitance 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 μF 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 capacitance listed in the specifications. Input Ripple Current and Output Noise All models in this converter series are tested and specified for input reflected ripple current and output noise using designated external input/output components, circuits and layout as shown in the figures below. In the figure 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 specific converter model. TO OSCILLOSCOPE CURRENT PROBE +INPUT VIN + – + – LBUS CBUS CIN 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 specified accuracy band. The specification assumes that the output is fully loaded at maximum rated current. Similar conditions apply to the On to Vout regulated specification such as external load capacitance and soft start circuitry. 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. -INPUT CIN = 2 x 100μF, ESR < 700mΩ @ 100kHz CBUS = 1000μF, ESR < 100mΩ @ 100kHz LBUS = 1μH Figure 3. Measuring Input Ripple Current In figure 4, 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 halfinch and soldered directly to the test circuit. 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 graphs are all collected at slightly above Sea Level altitude. Be sure to reduce the derating for higher density altitude. COPPER STRIP +OUTPUT C1 C2 SCOPE RLOAD -OUTPUT COPPER STRIP C1 = 0.1μF CERAMIC C2 = 10μF TANTALUM LOAD 2-3 INCHES (51-76mm) FROM MODULE Figure 4. Measuring Output Ripple and Noise (PARD) Minimum Output Loading Requirements All models regulate within specification 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/DC’s 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 application to avoid unplanned thermal shutdown. Temperature Derating Curves The graphs in this data sheet 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 airflow measured in Linear Feet per Minute (“LFM”). Note that these are AVERAGE measurements. The converter will accept brief increases in current or reduced airflow as long as the average is not exceeded. Note that the temperatures are of the ambient airflow, not the converter itself which is obviously running at higher temperature than the outside air. Also note that very low flow rates (below about 25 LFM) are similar to “natural convection”, that is, not using fan-forced airflow. Murata Power Solutions makes Characterization measurements in a closed cycle wind tunnel with calibrated airflow. We use both thermocouples and an infrared camera system to observe thermal performance. Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However your output application circuit may need additional protection. 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 defined as the point at which full power falls below the rated tolerance. See the Performance/Functional Specifications. Note particularly that the output current may briefly 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 (approximately 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 indefinitely. 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 condition is removed. 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 polarity models are enabled when the On/Off pin is left open or is pulled high to +Vin with respect to –Vin. Positive-polarity devices are disabled when the On/Off is grounded or brought to within a low voltage (see Specifications) with respect to –Vin. Negative polarity devices are on (enabled) when the On/Off pin is left open or brought to within a low voltage (see Specifications) with respect to –Vin. The device is off (disabled) when the On/Off is pulled high (see Specifications) with respect to –Vin. 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 signal current when brought low and withstand appropriate voltage when brought high. Be aware too that there is a finite time in milliseconds (see Specifications) 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 specifications. 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 oscillation 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 Efficiency 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 3.5 90 80 3.0 Natural convection VIN = 5.5V VIN = 5V VIN = 2.4V 60 50 2.5 Output Current (Amps) Efficiency (%) 70 40 30 2.0 1.5 1.0 20 0.5 10 0 0 0.5 1 1.5 2 2.5 3 3.5 Load Current (Amps) On/Off Enable Startup (Vin=5.5V, Vout=1.2V, Iout=3A, Cload=0) 0.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (ºC) 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 Efficiency 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) 3.5 100 VIN = 5.5V VIN = 5V VIN = 2.4V 60 Natural convection 2.5 Output Current (Amps) Efficiency (%) 3.0 80 40 2.0 1.5 1.0 20 0.5 0 0 0.5 1 1.5 2 2.5 3 3.5 Load Current (Amps) 0.0 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 Efficiency 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) 3.5 3.0 80 VIN = 5.5V VIN = 5V VIN = 2.4V 60 Natural convection 2.5 Output Current (Amps) Efficiency (%) 100 40 20 2.0 1.5 1.0 0.5 0 0 0.5 1 1.5 2 2.5 Load Current (Amps) 3 3.5 0.0 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 Efficiency 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 Natural convection VIN = 5.5V VIN = 5V VIN = 3V 85 2.5 Output Current (Amps) Efficiency (%) 90 80 75 2.0 1.5 1.0 70 0.5 65 0 0.5 1 1.5 2 2.5 Load Current (Amps) 3 On/Off Enable Startup (Vin=5.5V, Vout=2.5V, Iout=3A, Cload=0) 3.5 0.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (ºC) 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 Efficiency 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 4.0 VIN = 5.5V VIN = 5V VIN = 2.4V 60 50 Output Current (Amps) Efficiency (%) 70 40 30 3.0 2.0 1.0 20 0 20 10 0 25 30 35 40 45 50 55 60 65 70 75 80 85 90 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 Efficiency 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 Natural convection VIN = 5.5V VIN = 5V VIN = 2.4V 60 4.0 Output Current (Amps) Efficiency (%) 5.0 80 40 2.0 1.0 20 0 3.0 0 20 0 1 2 3 4 5 6 25 30 35 40 45 50 55 60 65 70 75 80 85 90 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 Efficiency 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 Natural convection VIN = 5.5V VIN = 5V VIN = 2.4V 60 4.0 Output Current (Amps) Efficiency (%) 5.0 80 40 3.0 2.0 1.0 20 0 20 0 0 1 2 3 4 Load Current (Amps) 5 On/Off Enable Startup (Vin=5.5V, Vout=1.5V, Iout=5A, Cload=0) 6 25 30 35 40 45 50 55 60 65 70 75 80 85 90 Ambient Temperature (ºC) 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 Efficiency 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 Natural convection VIN = 5.5V VIN = 5V VIN = 2.4V 60 4.0 Output Current (Amps) Efficiency (%) 5.0 80 40 2.0 1.0 20 0 3.0 0 20 0 1 2 3 4 5 6 25 30 35 40 45 50 55 60 65 70 75 80 85 90 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 Efficiency 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 4.0 VIN = 5.5V VIN = 5V VIN = 3V 85 Output Current (Amps) Efficiency (%) 90 80 75 3.0 2.0 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 Load Current (Amps) 5 On/Off Enable Startup (Vin=5.5V, Vout=2.5V, Iout=5A, Cload=0) 6 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 Efficiency 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 4.0 VIN = 5.5V VIN = 5V VIN = 3.8V 85 Output Current (Amps) Efficiency (%) 90 80 75 3.0 2.0 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 Load Current (Amps) 5 On/Off Enable Startup (Vin=5.5V, Vout=3.3V, Iout=5A, Cload=0) 6 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 0.092 (P/U) 16.00 0.630 44.00 1.732 6.86 0.270 ROUND HOLES 4.00 0.157 22.25 0.876 (P/U) 40.40 1.591 2.00 0.079 OBLONG HOLES FEED (UNWIND) DIRECTION ------- Dimensions are in inches (mm shown for ref. only). 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. PIN #1 THIS CORNER (FARSIDE) 5.64 0.222 REF 101.6 4.00 (CORE) 44.0 1.73 REF 10.67 0.420 20.8 0.82 REF 330.2 13.00 PICKUP NOZZLE LOCATION ( 3-6mm) 11.9 0.47 REF PICK & PLACE PICKUP (P/U) Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED 13.00 .512 REEL INFORMATION (400 UNITS PER REEL) This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ 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. Specifications 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