DC/DC Converter. LME0305SC Datasheet

LME0305SC Converter. Datasheet pdf. Equivalent


Murata LME0305SC
www.murata-ps.com
LME0305SC
Isolated 0.25W Single Output DC/DC Converter
FEATURES
„RoHS compliant
„UL 94V-0 package material
„No heatsink required
„Industry standard pinout
„1kVDC isolation
„Internal SMD construction
„Fully encapsulated with toroidal
magnetics
„No external components required
„No electrolytic or tantalum capacitors
DESCRIPTION
The LME0305SC is optimized for low-power
applications and is ideally suited to generating a
negative supply where only a positive rail exists.
SELECTION GUIDE
Order Code
Nominal Input
Voltage
LME0305SC
V
3.3
Output
Voltage
V
5
Output Current Efficiency
mA %
50 70
Isolation
Capacitance
pF
25
Package
Style
SIP
INPUT CHARACTERISTICS
Parameter
Conditions
Voltage range
Continuous operation, 3.3V input types
Min. Typ. Max. Units
2.97 3.3 3.63
V
OUTPUT CHARACTERISTICS
Parameter
Conditions
Rated Power1
TA=0°C to 70°C
Voltage Set Point Accuracy See tolerance envelope
Line regulation
High VIN to low VIN
Load Regulation
10% load to rated load
Ripple and Noise
BW=DC to 20MHz
Min. Typ. Max. Units
0.25 W
1.0 1.2 %/%
3.5 15
%
75 mV p-p
ISOLATION CHARACTERISTICS
Parameter
Conditions
Isolation test voltage
Flash tested for 1 second
Resistance
Viso= 500V
Min. Typ. Max. Units
1000 VDC
1 10
GENERAL CHARACTERISTICS
Parameter
Conditions
Switching frequency
Min. Typ. Max. Units
100 kHz
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
Specification
All output types
Storage
Min. Typ. Max. Units
0 70
°C
-50 130
ABSOLUTE MAXIMUM RATINGS
Lead temperature 1.5mm from case for 10 seconds
Input voltage VIN
300°C
5.5V
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%.
1. See derating graph.
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
KDC_LME0305SC.A02 Page 1 of 3


LME0305SC Datasheet
Recommendation LME0305SC Datasheet
Part LME0305SC
Description Isolated 0.25W Single Output DC/DC Converter
Feature LME0305SC; www.murata-ps.com LME0305SC Isolated 0.25W Single Output DC/DC Converter FEATURES „RoHS compliant.
Manufacture Murata
Datasheet
Download LME0305SC Datasheet




Murata LME0305SC
RoHS COMPLIANCE INFORMATION
LME0305SC
Isolated 0.25W Single Output DC/DC Converter
The LME0305SC 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
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 LME0305SC DC/DC converter is 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 LME0305SC, 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 materi-
als, construction and environment. The LME0305SC has a toroidal isolation transformer, 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.
PACKAGE SPECIFICATIONS
MECHANICAL DIMENSIONS
0.236
(6.00)
0.45
(11.48)
PIN CONNECTIONS
Pin Function
1 -VIN
2 +VIN
3 -VOUT
4 +VOUT
0.393
(10.0) LME0305SC
XYYWW
0.022 (0.55)
0.018 (0.45)
1234
0.181 (4.60)
0.142 (3.60)
0.074 (1.89)
0.109 (2.77)
0.022 (0.55)
0.018 (0.45)
0.0118 (0.30)
0.0078 (0.20)
0.049
(1.25)
0.3
(7.62)
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
www.murata-ps.com
KDC_LME0305SC.A02 Page 2 of 3



Murata LME0305SC
PACKAGE SPECIFICATIONS (continued)
RECOMMENDED FOOTPRINT DETAILS
4 HOLES
0.1 (0.00394)
Ø
1.15
1.00
(0.0453)
(0.0394)
2.54
(0.1)
LME0305SC
Isolated 0.25W Single Output DC/DC Converter
TUBE OUTLINE DIMENSIONS
9.30 (0.366)
2.54
(0.1)
Unless otherwise stated all dimensions in inches (mm ±0.5mm).
TEMPERATURE DERATING GRAPH
3
2 70°C
Safe Operating
1 Area
0
-40 0 50 100 150
Ambient Temperature (°C)
5.00 (0.2)
Unless otherwise stated all dimensions in inches (mm ±0.5mm).
Tube length: 20.47 (520mm ±2mm).
Tube Quantity : 35
TOLERANCE ENVELOPE
+10%
+1.5%
V
NOM
Typical Load Line
+2.5%
-2%
-7.5%
10 25 50 75 100
Output Load Current (%)
The voltage tolerance envelope shows typical load regulation characteristics for this
product series. The tolerance envelope is the maximum output voltage variation due to
changes in output loading.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
www.murata-ps.com/locations
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.
© 2010 Murata Power Solutions, Inc.
KDC_LME0305SC.A02 Page 3 of 3







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