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參數(shù)資料
| 型號： | LQH32C |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Dual Micropower DC/DC Converters with Schottky Diodes |
| 中文描述： | 雙微功率DC / DC轉(zhuǎn)換的肖特基二極管 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 193K |
| 代理商： | LQH32C |
5
LT3463/LT3463A
3463f
Choosing an Inductor
Several recommended inductors that work well with the
LT3463 are listed in Table 1, although there are many other
manufacturers and devices that can be used. Consult each
manufacturer for more detailed information and for their
entire selection of related parts. Many different sizes and
shapes are available. Use the equations and recommenda-
tions in the next few sections to find the correct inductance
value for your design.
Table 1. Recommended Inductors
MAX
MAX
HEIGHT
(mm)
0.8
PART
CMD4D06
L (
μ
H) I
DC
(mA) DCR(
)
4.7
750
10
500
22
310
10
500
22
310
4.7
600
10
400
22
280
10
450
15
300
22
250
4.7
340
MANUFACTURER
Sumida
(847) 956-0666
www.sumida.com
Sumida
0.22
0.46
1.07
0.19
0.36
0.16
0.30
0.64
0.39
0.75
0.92
0.85
CDRH3D16
1.8
LPO4812
1.2
Coilcraft
(847) 639-6400
www.coilcraft.com
Murata
(714) 852-2001
www.murata.com
Murata
LQH32C
1.8
LQH31C
1.8
Inductor Selection—Boost Regulator
The formula below calculates the appropriate inductor
value to be used for a boost regulator using the LT3463 (or
at least provides a good starting point). This value pro-
vides a good tradeoff in inductor size and system perfor-
mance. Pick a standard inductor close to this value. A
larger value can be used to slightly increase the available
output current, but limit it to around twice the value
calculated below, as too large of an inductance will in-
crease the output voltage ripple without providing much
additional output current. A smaller value can be used
(especially for systems with output voltages greater than
12V) to give a smaller physical size. Inductance can be
calculated as:
L
V
V
V
I
t
OUT
IN MIN
D
LIM
OFF
=
+
)
where V
D
= 0.5V (Schottky diode voltage), I
LIM
= 250mA
(or 400mA) and t
OFF
= 300ns; for designs with varying V
IN
APPLICATIU
W
U
U
such as battery powered applications, use the minimum
V
IN
value in the above equation. For most regulators with
output voltages below 7V, a 4.7
μ
H inductor is the best
choice, even though the equation above might specify a
smaller value.
For higher output voltages, the formula above will give
large inductance values. For a 3V to 20V converter (typical
LCD Bias application), a 21
μ
H inductor is called for with
the above equation, but a 10
μ
H inductor could be used
without much reduction in the maximum output current.
Inductor Selection—Inverting Regulator
The formula below calculates the appropriate inductor
value to be used for an inverting regulator using the
LT3463 (or at least provides a good starting point). This
value provides a good tradeoff in inductor size and system
performance. Pick a standard inductor close to this value
(both inductors should be the same value). A larger value
can be used to slightly increase the available output
current, but limit it to around twice the value calculated
below, as too large of an inductance will increase the
output voltage ripple without providing much additional
output current. A smaller value can be used (especially for
systems with output voltages greater than 12V) to give a
smaller physical size. Inductance can be calculated as:
L
V
V
I
t
OUT
D
LIM
OFF
=
+
2
where V
D
= 0.5V (Schottky diode voltage), I
LIM
= 250mA
(or 400mA) and t
OFF
= 300ns.
For higher output voltages, the formula above will give
large inductance values. For a 3V to 20V converter (typical
LCD bias application), a 49
μ
H inductor is called for with
the above equation, but a 10
μ
H or 22
μ
H inductor could be
used without much reduction in the maximum output
current.
Inductor Selection—Inverting Charge Pump Regulator
For the inverting regulator, the voltage seen by the internal
power switch is equal to the sum of the absolute value of
the input and output voltages, so that generating high
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| LQH32CH100K23L | 功能描述:固定電感器 10uH 10% 1MHz RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
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