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Murata Manufacturing Electronic Components Datasheet

LME1212DC Datasheet

Isolated 250mW Single Output DC/DC Converters

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www.murata-ps.com
LME Series
Isolated 250mW Single Output DC/DC Converters
FEATURES
„RoHS compliant
„Single output rail
„1kVDC isolation
„High efficiency for low power applications
„SIP & DIP package styles
„Power density 0.36W/cm3
„UL 94V-0 package material
„Footprint from 0.69cm2
„5V & 12V input
„5V, 9V, 12V & 15V output
„No heatsink required
„Internal SMD construction
„Fully encapsulated with toroidal magnetics
„No external components required
„MTTF up to 2.7 million hours
„Custom solutions available
„Pin compatible with NKE, NME, NML &
MEE3 series
„PCB mounting
PRODUCT OVERVIEW
The LME series of DC/DC converters are optimised
for low-power operation. They are ideally suited to
generating a negative supply where only a posi-
tive rail exists.
SELECTION GUIDE
Nominal Input
Order Code
Voltage
V
LME0505DC
5
LME0509DC
5
LME0512DC
5
LME0515DC
5
LME0505SC
5
LME0509SC
5
LME0512SC
5
LME0515SC
5
LME1205DC
12
LME1209DC
12
LME1212DC
12
LME1215DC
12
LME1205SC
12
LME1209SC
12
LME1212SC
12
LME1215SC
12
Output
Voltage
V
5
9
12
15
5
9
12
15
5
9
12
15
5
9
12
15
Output
Current
mA
50
28
21
16
50
28
21
16
50
28
21
16
50
28
21
16
Efficiency
%
70
75
75
75
70
75
75
75
70
75
75
75
70
75
75
75
Isolation
Capacitance
pF
29
37
41
40
29
37
41
40
38
40
43
45
38
40
43
45
MTTF1
kHrs
2279
1139
624
357
2279
1139
624
357
536
434
330
237
536
434
330
237
Package
Style
DIP
SIP
DIP
SIP
INPUT CHARACTERISTICS
Parameter
Conditions
Voltage range
Continuous operation, 5V input types
Continuous operation, 12V input types
Min. Typ. Max. Units
4.5 5.0 5.5
10.8 12 13.2
V
OUTPUT CHARACTERISTICS
Parameter
Conditions
Rated Power2
TA=0°C to 70°C
Voltage Set Point Accuracy See tolerance envelope
Line regulation
High VIN to low VIN
Load Regulation2
10% load to rated load, 5V output types
10% load to rated load, all other types
Ripple and Noise
BW=DC to 20MHz, all output types
Min. Typ. Max. Units
0.25 W
1.0 1.2 %/%
15
%
10
100 mV p-p
ISOLATION CHARACTERISTICS
Parameter
Conditions
Isolation test voltage
Flash tested for 1 second
Resistance
Viso= 500VDC
Min. Typ. Max. Units
1000 VDC
1 GΩ
GENERAL CHARACTERISTICS
Parameter
Conditions
Switching frequency
All input types
Min. Typ. Max. Units
100 kHz
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
Input voltage VIN, LME05 types
Input voltage VIN, LME12 types
300°C
7V
15V
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2. See derating curve.
All specifications typical at TA=25°C, nominal input voltage and rated output current unless otherwise specified.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
KDC_LMEC.E05 Page 1 of 4


Murata Manufacturing Electronic Components Datasheet

LME1212DC Datasheet

Isolated 250mW Single Output DC/DC Converters

No Preview Available !

LME Series
Isolated 250mW Single Output DC/DC Converters
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
Specification
All output types
Storage
Cooling
Free air convection
Min. Typ. Max. Units
0 70
°C
-50 130
TEMPERATURE DERATING GRAPH
0.375
0.250
70°C
0.125
0
0
Safe Operating
Area
125°C
50 100 150
Ambient Temperature (°C)
TOLERANCE ENVELOPE
+10%
+5%
V
NOM
Typical Load Line
+2.5%
-2.5%
-7.5%
10 25 50 75 100
Output Load Current (%)
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 specified 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 specific 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 specified 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
300°C for 10 seconds. The pin termination finish 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 specification is 10% of the full rated load across the specified input voltage range. Lower than 10% minimum loading will result in an
increase in output voltage, which may rise to typically double the specified output voltage if the output load falls to less than 5%.
www.murata-ps.com/support
KDC_LMEC.E05 Page 2 of 4


Part Number LME1212DC
Description Isolated 250mW Single Output DC/DC Converters
Maker Murata
Total Page 4 Pages
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