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001-01 / 20030729 / e531_ldr655312.fm
Inductors
Wound Type for Power Circuit
SMD
These products are low height type power inductors optimum to a
DC-DC converter for driving an LCD panel. A plane accuracy of a
user terminal is increased by separating a winding terminal. In
addition, an application of a new-designed thin type drum core sig-
nificantly lowers leakage flux so as to satisfy needs for high density
mounting.
FEATURES
• The first low height realized by using new magnetic material
superior in superimposed DC current characteristics with high
specific resistance and by adopting a design in which a lead
frame is directly bonded.
• Mountable on the back side of the LCD surface because of low
height type (1.20mm max.).
• Low leakage flux drum core with original design applied.
• Size equivalent to a half of a conventional core having the same
characteristics realized, thus enabling light weight (0.1g max.).
• Automatic inserter usable in taping specifications.
• All terminals are welded without lead.
APPLICATIONS
LCD driving circuits (DC-DC converters) such as notebook-sized
personal computers, portable terminal equipment, game units
SPECIFICATIONS
Operating temperature range
Storage temperature range
–25 to +85°C
[Including self-temperature rise]
–40 to +85°C[Unit of products]
LDR Series LDR655312 Type
PRODUCT IDENTIFICATION
LDR 655312 T- 2R2 W
(1)
(2) (3) (4) (5)
(1) Series name
(2) DimensionsL×W×T
655312
6.5×5.3×1.2mm
(3) Packaging style
T
Taping(reel)
(4) Inductance value
2R2
100
2.2µH
10µH
(5)Variation code
W
Welding
PACKAGING STYLE AND QUANTITIES
Packaging style
Taping
Quantity
3000 pieces/reel
APPLICATION EXAMPLES
Step-up chopper circuit
LDR
RECOMMENDED SOLDERING CONDITIONS
REFLOW SOLDERING
240˚C
230˚C Soldering
200˚C
160˚C
40s max.
130˚C
Approx. 90s
Preheating
Time (s)
Approx. 150s
5s max.
9s max.
Natural
cooling
IN
IC
OUT
Inverting chopper circuit
IN
LDR
IC
OUT
Step-down chopper circuit
LDR
IN
IC
OUT
• All specifications are subject to change without notice.
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001-01 / 20030729 / e531_ldr655312.fm
Inductors
Wound Type for Power Circuit
SMD
LDR Series LDR655312 Type
SHAPES AND DIMENSIONS/RECOMMENDED PC BOARD PATTERN
6.5max.
Start mark
#1
Rising of welded terminal in pack portion
0.08min.
Welding part
1.2max.
#1
4
1
22
#2
Marking
(Inductance code)
5.3±0.1
CONNECTION
#1
Weight: 0.1g typ.
Dimensions in mm
N1
#2
2.3
#2
Connection pad
Terminal reinforcement pad
Dimensions in mm
1
ELECTRICAL CHARACTERISTICS
Inductance
(µH)
2.2
3.3
4.7
6.8
10
15
22
33
47
Inductance
tolerance (%)
±20
±20
±20
±20
±20
±20
±20
±20
±20
Test frequency L
(kHz)
100
100
100
100
100
100
100
100
100
DC resistance
(Ω)±20%
0.125
0.155
0.206
0.24
0.37
0.46
0.668
1.1
1.38
Rated current (A)
∗
max.
1.2
0.96
0.9
0.8
0.7
0.6
0.5
0.42
0.34
Part No.
LDR655312T-2R2W
LDR655312T-3R3W
LDR655312T-4R7W
LDR655312T-6R8W
LDR655312T-100W
LDR655312T-150W
LDR655312T-220W
LDR655312T-330W
LDR655312T-470W
∗
Rated current: Value obtained when self-temperature has risen to 40°C.
• Test equipment Inductance: YHP 4284 LDR METER, or equivalent(Test frequency:100kHz/20mV)
Rdc: DIGITAL MILLIOHM METER VP-2941A MATSUSHITA, or equivalent
TYPICAL ELECTRICAL CHARACTERISTICS
INDUCTANCE CHANGE vs. DC SUPERPOSITION
CHARACTERISTICS
100
47µH
33µH
30
22µH
Inductance (
µH
)
15µH
10
10µH
6.8µH
4.7µH
3.3µH
3
2.2µH
1
0.01
0.03
0.1
0.3
1
DC current (A)
3
10
• All specifications are subject to change without notice.
6
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