SELECTION GUIDE
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
3
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.
Nominal
Input
Output
Output
Isolation
Package
Voltage
Voltage
Current
Efficiency Capacitance
MTTF
1
Style
Order Code
(V)
(V)
(mA)
(%)
(pF)
kHrs
LME0305D
3.3
5
50
70
25
2767
DIP
LME0305S
3.3
5
50
70
25
2767
SIP
LME0309D
3.3
9
28
75
30
1250
DIP
LME0309S
3.3
9
28
75
30
1250
SIP
LME0312D
3.3
12
21
75
38
655
DIP
LME0312S
3.3
12
21
75
38
655
SIP
LME0315D
3.3
15
16
75
38
367
DIP
LME0315S
3.3
15
16
75
38
367
SIP
LME0503D
5
3.3
76
70
25
2637
DIP
LME0503S
5
3.3
76
70
25
2637
SIP
LME0505D
5
5
50
70
29
2279
DIP
LME0505S
5
5
50
70
29
2279
SIP
LME0509D
5
9
28
75
37
1139
DIP
LME0509S
5
9
28
75
37
1139
SIP
LME0512D
5
12
21
75
41
624
DIP
LME0512S
5
12
21
75
41
624
SIP
LME0515D
5
15
16
75
40
357
DIP
LME0515S
5
15
16
75
40
357
SIP
LME1205D
12
5
50
70
38
536
DIP
LME1205S
12
5
50
70
38
536
SIP
LME1209D
12
9
28
75
40
434
DIP
LME1209S
12
9
28
75
40
434
SIP
LME1212D
12
12
21
75
43
330
DIP
LME1212S
12
12
21
75
43
330
SIP
LME1215D
12
15
16
75
45
237
DIP
LME1215S
12
15
16
75
45
237
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.
Parameter
Conditions
MIN
TYP
MAX
Units
Continuous operation, 3.3V input types
2.97
3.3
3.63
Voltage Range
Continuous operation, 5V input types
4.5
5
5.5
V
Continuous operation, 12V input types
10.8
12
13.2
Short-circuit duration
3
1 second
Lead temperature 1.5mm from case for 10 seconds
300C
Input voltage V
IN
, LME03 types
5V
Input voltage V
IN
, LME05 types
7V
Input voltage V
IN
, LME12 types
15V
INPUT CHARACTERISTICS
OUTPUT CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
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
=25C, nominal input voltage and rated output current unless otherwise specified.
LME SERIES
Isolated 250mW Single Output DC-DC Converters
www.dc-dc.com
Parameter
Conditions
MIN
TYP
MAX
Units
Rated Power
2
T
A
= 0C to 70C
0.25
W
Voltage Set
Point Accuracy
See tolerance envelope
Line Regulation High V
IN
to low V
IN
1.2
%/%
10% load to rated load,
Load Regulation
3.3V & 5V output types
15
%
10% load to rated load,
all other output types
10
Ripple & Noise
BW=DC to 20MHz, LME03 types
75
mV p-p
BW=DC to 20MHz, all other output types
100
LME SERIES
Isolated 250mW Single Output DC-DC Converters
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
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
ISOLATION CHARACTERISTICS
PERFORMANCE CHARACTERISTICS
GENERAL CHARACTERISTICS
TEMPERATURE CHARACTERISTICS
PIN CONNECTIONS
Parameter
Conditions
MIN
TYP
MAX
Units
Isolation Test Voltage
Flash tested for 1 second
1000
VDC
Resistance
Viso=500VDC
1
G
Parameter
Conditions
MIN
TYP
MAX
Units
Switching Frequency
All input types
100
kHz
11.50
9.80
MECHANICAL DIMENSIONS
Parameter
Conditions
MIN
TYP
MAX
Units
Specification
All output types
0
70
C
Storage
55
150
C
Cooling
Free air convection
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
tolerance envelope
+
10%
+5%
V nominal
+2.5%
-2.5%
-7.5%
10
50
100
Output Load Current (%)
6.80
7.62
7.62
0.250.05
0.250.05
4.1
5.08
0.500.05
11.50
6.00
10.0
1.9 Printed Face
1.25
7.62
4.1
0.500.05
0.500.05
All dimensions in mm XX.XX 0.25mm. All pins on a
2.54mm pitch and within 0.25mm of true position.
8 Pin DIP
4 Pin SIP
LME0505D
YYWW
LME0505S
YYWW
1
1
7
5
4
2 3 4
temperature derating graph
0.500
0.375
0.250
0.125
0
40
0
50
70
100 125 150
Ambient Temperature (C)
Safe Operating Area
PDF 
ZIP