additional external load capacitance the rise time of the input voltage will determine the maximum external ca-
pacitance value for guaranteed start up. The slower the rise time of the input voltage the greater the maximum value of the additional
external capacitance for reliable start up.
INPUT CHARACTERISTICS
Parameter
Voltage range
Conditions
Continuous operation, 5V input types
Continuous operation, 12V input types
Min.
4.5
10.8
Typ.
5.0
12
Max.
5.5
13.2
Units
V
OUTPUT CHARACTERISTICS
Parameter
Rated Power
2
Voltage Set Point Accuracy
Line regulation
Load Regulation
2
Ripple and Noise
Conditions
T
A
=0°C to 70°C
See tolerance envelope
High V
IN
to low V
IN
10% load to rated load, 5V output types
10% load to rated load, all other types
BW=DC to 20MHz, all output types
Min.
Typ.
Max.
0.25
Units
W
%/%
%
mV p-p
1.0
1.2
15
10
100
ISOLATION CHARACTERISTICS
Parameter
Isolation test voltage
Resistance
Conditions
Flash tested for 1 second
Viso= 500VDC
Min.
1000
1
Typ.
Max.
Units
VDC
GΩ
DESCRIPTION
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.
GENERAL CHARACTERISTICS
Parameter
Switching frequency
Conditions
All input types
Min.
Typ.
100
Max.
Units
kHz
ABSOLUTE MAXIMUM RATINGS
Short-circuit protection
3
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, LME05 types
Input voltage V
IN
, LME12 types
1 second
300°C
7V
15V
For full details go to
www.murata-ps.com/rohs
1. Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2. See derating curve.
3. Supply voltage must be disconnected at the end of the short circuit duration.
All specifications typical at T
A
=25°C, nominal input voltage and rated output current unless otherwise specified.
www.murata-ps.com
Technical enquiries
-
email:
mk@murata-ps.com,
tel:
+44 (0)1908 615232
KDC_LMEC_E03
Page 1 of 5
LME Series
Isolated 250mW Single Output DC/DC Converters
TEMPERATURE CHARACTERISTICS
Parameter
Specification
Storage
Cooling
Conditions
All output types
Free air convection
Min.
0
-55
Typ.
Max.
70
130
Units
°C
TEMPERATURE DERATING GRAPH
0.375
TOLERANCE ENVELOPE
+10%
Output Power (W)
0.250
0.125
0
70°C
+5%
V
NOM
Typical
L
oad Line
+2.5%
-2.5%
-7.5%
Safe Operating
Area
125°C
0
50
100
Ambient Temperature (°C)
150
Output Voltage
10
75
50
25
Output Load Current (%)
100
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
www.murata-ps.com
Technical enquiries
-
email:
mk@murata-ps.com,
tel:
+44 (0)1908 615232
KDC_LMEC_E03
Page 2 of 5
LME Series
Isolated 250mW Single Output DC/DC Converters
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
DIP Package
SIP Package
0.45
(11.48)
PIN CONNECTIONS - 8 PIN DIP
Pin
1
4
5
7
Function
-V
IN
+V
IN
+V
OUT
-V
OUT
0.386 (9.80)
LME0505DC
XYYWW
0.453 (11.50)
0.236
(6.00)
PIN CONNECTIONS - 4 PIN SIP
Pin
0.267 (6.80)
0.393
(10.0)
Function
-V
IN
+V
IN
-V
OUT
+V
OUT
LME0505SC
XYYWW
1
2
3
4
0.022 (0.55)
0.018 (0.45)
0.181 (4.60)
0.142 (3.60)
1
2
3
4
0.022 (0.55)
0.018 (0.45)
0.181 (4.60)
0.142 (3.60)
0.074 (1.89)
0.109 (2.77)
0.3 (7.62)
0.049
(1.25)
0.2 (5.08)
0.3 (7.62)
0.3
(7.62)
0.022 (0.55)
0.018 (0.45)
0.0118 (0.30)
0.0078 (0.20)
1
0.043 (1.09)
4
7
0.0118 (0.30)
0.0078 (0.20)
5
0.0763 (1.94)
All dimensions in inches ±0.01 (mm ±0.25mm). All pins on a 0.1 (2.54) pitch and within ±0.01 (0.25) of true position.
Weight: 1.30g (SIP) 1.48g (DIP)
www.murata-ps.com
Technical enquiries
-
email:
mk@murata-ps.com,
tel:
+44 (0)1908 615232
KDC_LMEC_E03
Page 3 of 5
LME Series
Isolated 250mW Single Output DC/DC Converters
PACKAGE SPECIFICATIONS (continued)
RECOMMENDED FOOTPRINT DETAILS
8 Pin DIP Package
4 Pin SIP Package
Unless otherwise stated all dimensions in inches (mm ±0.5mm).
TUBE OUTLINE DIMENSIONS
8 Pin DIP Tube
4 Pin SIP Tube
Unless otherwise stated all dimensions in inches (mm ±0.5mm).
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