LME Series www.murata-ps.com Isolated 250mW Single Output DC/DC Converters SELECTION GUIDE Nominal Input Output Output Isolation 1 Efciency MTTF Package Order Code Voltage Voltage Current Capacitance Style V V mA % pF kHrs LME0505DC 5 5 50 70 29 2279 LME0509DC 5 9 28 75 37 1139 DIP LME0512DC 5 12 21 75 41 624 LME0515DC 5 15 16 75 40 357 LME0505SC 5 5 50 70 29 2279 LME0509SC 5 9 28 75 37 1139 SIP LME0512SC 5 12 21 75 41 624 LME0515SC 5 15 16 75 40 357 LME1205DC 12 5 50 70 38 536 FEATURES LME1209DC 12 9 28 75 40 434 DIP RoHS compliant LME1212DC 12 12 21 75 43 330 LME1215DC 12 15 16 75 45 237 Single output rail LME1205SC 12 5 50 70 38 536 1kVDC isolation LME1209SC 12 9 28 75 40 434 SIP LME1212SC 12 12 21 75 43 330 High efciency for low power applications LME1215SC 12 15 16 75 45 237 SIP & DIP package styles INPUT CHARACTERISTICS 3 Power density 0.36W/cm Parameter Conditions Min. Typ. Max. Units UL 94V-0 package material Continuous operation, 5V input types 4.5 5.0 5.5 Voltage range V Continuous operation, 12V input types 10.8 12 13.2 2 Footprint from 0.69cm OUTPUT CHARACTERISTICS 5V & 12V input Parameter Conditions Min. Typ. Max. Units 5V, 9V, 12V & 15V output 2 Rated Power TA=0C to 70C 0.25 W Voltage Set Point Accuracy See tolerance envelope No heatsink required Line regulation High VIN to low VIN 1.0 1.2 %/% Internal SMD construction 10% load to rated load, 5V output types 15 2 Load Regulation % Fully encapsulated with toroidal magnetics 10% load to rated load, all other types 10 Ripple and Noise BW=DC to 20MHz, all output types 100 mV p-p No external components required ISOLATION CHARACTERISTICS MTTF up to 2.7 million hours Parameter Conditions Min. Typ. Max. Units Custom solutions available Isolation test voltage Flash tested for 1 second 1000 VDC Pin compatible with NKE, NME, NML & Resistance Viso= 500VDC 1 G MEE3 series GENERAL CHARACTERISTICS PCB mounting Parameter Conditions Min. Typ. Max. Units Switching frequency All input types 100 kHz PRODUCT OVERVIEW ABSOLUTE MAXIMUM RATINGS The LME series of DC/DC converters are optimised Lead temperature 1.5mm from case for 10 seconds 300C for low-power operation. They are ideally suited to Input voltage VIN, LME05 types 7V generating a negative supply where only a posi- Input voltage VIN, LME12 types 15V tive rail exists. 1. Calculated using MIL-HDBK-217F with nominal input voltage at full load. 2. See derating curve. All specications typical at TA=25C, nominal input voltage and rated output current unless otherwise specied. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support KDC LMEC.E05 Page 1 of 4Typical Load Line LME Series Isolated 250mW Single Output DC/DC Converters TEMPERATURE CHARACTERISTICS Parameter Conditions Min. Typ. Max. Units Specication All output types 0 70 C Storage -50 130 Cooling Free air convection TEMPERATURE DERATING GRAPH TOLERANCE ENVELOPE +10% 0.375 +5% +2.5% V 70C NOM -2.5% 0.250 -7.5% Safe Operating 0.125 Area 125C 100 10 25 50 75 0 0 50 100 150 Output Load Current (%) Ambient Temperature (C) The voltage tolerance envelope shows typical load regulation characteristics for this product series. The toler- ance envelope is the maximum output voltage variation due to changes in output loading. TECHNICAL NOTES ISOLATION VOLTAGE Hi Pot Test, Flash Tested, Withstand Voltage, Proof Voltage, Dielectric Withstand Voltage & Isolation Test Voltage are all terms that relate to the same thing, a test voltage, applied for a specied time, across a component designed to provide electrical isolation, to verify the integrity of that isolation. Murata Power Solutions LME series of DC/DC converters are all 100% production tested at their stated isolation voltage. This is 1kVDC for 1 second. A question commonly asked is, What is the continuous voltage that can be applied across the part in normal operation For a part holding no specic agency approvals, such as the LME series, both input and output should normally be maintained within SELV limits i.e. less than 42.4V peak, or 60VDC. The isolation test voltage represents a measure of immunity to transient voltages and the part should never be used as an element of a safety isolation system. The part could be expected to function correctly with several hundred volts offset applied continuously across the isolation barrier but then the circuitry on both sides of the barrier must be regarded as operating at an unsafe voltage and further isolation/insulation systems must form a barrier between these circuits and any user-accessible circuitry according to safety standard requirements. REPEATED HIGH-VOLTAGE ISOLATION TESTING It is well known that repeated high-voltage isolation testing of a barrier component can actually degrade isolation capability, to a lesser or greater degree depending on materials, construction and environment. The LME series has toroidal isolation transformers, with no additional insulation between primary and secondary windings of enameled wire. While parts can be expected to withstand several times the stated test voltage, the isolation capability does depend on the wire insulation. Any material, including this enamel (typically polyurethane) is susceptible to eventual chemical degradation when subject to very high applied voltages thus implying that the number of tests should be strictly limited. We therefore strongly advise against repeated high voltage isolation testing, but if it is absolutely required, that the voltage be reduced by 20% from specied test voltage. This consideration equally applies to agency recognized parts rated for better than functional isolation where the wire enamel insulation is always supplemented by a further insulation system of physical spacing or barriers. RoHS COMPLIANT INFORMATION This series is compatible with RoHS soldering systems with a peak wave solder temperature of 300C for 10 seconds. The pin termination nish on the SIP package type is Tin Plate, Hot Dipped over Matte Tin with Nickel Preplate. The DIP types are Matte Tin over Nickel Preplate. Both types in this series are backward compatible with Sn/Pb soldering systems. For further information, please visit www.murata-ps.com/rohs APPLICATION NOTES Minimum Load The minimum load to meet datasheet specication is 10% of the full rated load across the specied input voltage range. Lower than 10% minimum loading will result in an increase in output voltage, which may rise to typically double the specied output voltage if the output load falls to less than 5%. www.murata-ps.com/support KDC LMEC.E05 Page 2 of 4 Output Power (W) Output Voltage