LME SERIES
Isolated 250mW Single Output DC-DC Converters
SELECTION GUIDE
Nominal
Input
Voltage
Output
Voltage
Output
Current
Isolation
Efficiency Capacitance
MTTF
1
Package
Style
Order Code
LME0305D
LME0305S
LME0309D
LME0309S
LME0312D
LME0312S
LME0315D
LME0315S
FEATURES
s
High Efficiency for Low Power
Applications
s
Pin Compatible with NME & NML
s
1kVDC Isolation
s
SIP & DIP Package Styles
s
Single Output Rail
s
Power Density 0.36W/cm
s
3.3V, 5V and 12V Input
s
3.3V, 5V, 9V, 12V and 15V Output
s
Footprint from 0.69cm
2
s
UL 94V-0 Package Material
s
No Heatsink Required
s
Internal SMD Construction
s
Toroidal Magnetics
s
Fully Encapsulated
s
No External Components Required
s
MTTF up to 3.2 Million Hours
s
PCB Mounting
s
Custom Solutions Available
DESCRIPTION
The LME series of DC-DC converters are
optimised for low-power operation. Due to
the low quiescent current they are able to
offer efficiencies up to 75%. The use of
advanced magnetics ensures a minimal
quiescent current of around 2.5mA which
ensures that efficiency is maximised in low
power applications. They are ideally suited
to generating a negative supply where only
a positive rail exists.
3
LME0503D
LME0503S
LME0505D
LME0505S
LME0509D
LME0509S
LME0512D
LME0512S
LME0515D
LME0515S
LME1205D
LME1205S
LME1209D
LME1209S
LME1212D
LME1212S
LME1215D
LME1215S
(V)
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
5
5
5
5
5
5
5
5
5
5
12
12
12
12
12
12
12
12
(V)
5
5
9
9
12
12
15
15
3.3
3.3
5
5
9
9
12
12
15
15
5
5
9
9
12
12
15
15
(mA)
50
50
28
28
21
21
16
16
76
76
50
50
28
28
21
21
16
16
50
50
28
28
21
21
16
16
(%)
70
70
75
75
75
75
75
75
70
70
70
70
75
75
75
75
75
75
70
70
75
75
75
75
75
75
(pF)
25
25
30
30
38
38
38
38
25
25
29
29
37
37
41
41
40
40
38
38
40
40
43
43
45
45
kHrs
2767
2767
1250
1250
655
655
367
367
2637
2637
2279
2279
1139
1139
624
624
357
357
536
536
434
434
330
330
237
237
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
DIP
SIP
When operated
with
additional external load capacitance the rise time of the input voltage will determine the
maximum external capacitance 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
Conditions
MIN
TYP
MAX
Units
Voltage Range
Continuous operation, 3.3V input types
Continuous operation, 5V input types
Continuous operation, 12V input types
2.97
4.5
10.8
3.3
5
12
3.63
5.5
13.2
V
OUTPUT CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Rated Power
2
Voltage Set
Point Accuracy
Line Regulation
T
A
= 0°C to 70°C
See tolerance envelope
0.25
W
High V
IN
to low V
IN
10% load to rated load,
3.3V & 5V output types
Load Regulation
10% load to rated load,
all other output types
BW=DC to 20MHz, LME03 types
Ripple & Noise
BW=DC to 20MHz, all other output types
1.2
15
%/%
%
10
75
100
mV p-p
ABSOLUTE MAXIMUM RATINGS
Short-circuit duration
3
Lead temperature 1.5mm from case for 10 seconds
Input voltage V
IN
, LME03 types
Input voltage V
IN
, LME05 types
Input voltage V
IN
, LME12 types
1 second
300°C
5V
7V
15V
www.dc-dc.com
1 Calculated using MIL-HDBK-217F with nominal input voltage at full load.
2 See derating curve
3 Supply voltage must be discontinued 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.
LME SERIES
Isolated 250mW Single Output DC-DC Converters
ISOLATION CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
PIN CONNECTIONS
1000
1
VDC
GΩ
8 Pin DIP
PIN
1 GND
4
V
IN
5
+V
7
0V
4 Pin SIP
PIN
1 GND
2
V
IN
3
0V
4
+V
Isolation Test Voltage
Resistance
Flash tested for 1 second
Viso=500VDC
GENERAL CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Switching Frequency
All input types
100
kHz
TEMPERATURE CHARACTERISTICS
Parameter
Conditions
MIN
TYP
MAX
Units
Specification
Storage
Cooling
All output types
Free air convection
0
–55
70
150
°C
°C
PERFORMANCE CHARACTERISTICS
tolerance envelope
+
10%
+5%
V nominal
0.500
+2.5%
-2.5%
-7.5%
0.250
0.125
0
0.375
temperature derating graph
Safe Operating Area
10
50
Output Load Current (%)
100
–40
0
50 70 100 125 150
Ambient Temperature (°C)
MECHANICAL DIMENSIONS
8 Pin DIP
9.80
11.50
7.62
LME0505D
YYWW
6.80
7.62
1
7
4
5
5.08
1.9 Printed Face
0.25±0.05
0.25±0.05
4.1
0.50±0.05
4 Pin SIP
6.00
11.50
LME0505S
10.0
YYWW
1
.25
7
.62
4.1
1 2 3 4
0.50±0.05
0.50±0.05
All dimensions in mm XX.XX ±0.25mm. All pins on a
2.54mm pitch and within ±0.25mm of true position.
C&D Technologies (NCL) Limited reserve the right to alter or improve the
specification, internal design or manufacturing process at any time, without
notice. Please check with your supplier or visit our web site to ensure that
you have the current and complete specification for your product before use.
© C&D Technologies (NCL) Limited 2001
NDC LME.2
No part of this publication may be copied, transmitted or stored in a
retrieval system or reproduced in any way including, but not limited to,
photography, photocopy, magnetic or other recording means, without prior
written permission from C&D Technologies (NCL) Limited.
Instructions for use are available from www.dc-dc.com
C&D Technologies (NCL) Ltd
Tanners Drive, Blakelands North
Milton Keynes MK14 5BU, England
Tel: +44 (0)1908 615232
Fax:+44 (0)1908 617545
email: info@cdtechno-ncl.com
www: http://www.dc-dc.com
C&D Technologies (NCL), Inc.
5816 Creedmoor Road, Raleigh
NC 27612, USA
Tel: +1 (919) 571-9405
Fax: +1 (919) 571-9262
email: info@us.cdtechno-ncl.com
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