參數(shù)資料
型號(hào)： LT3464ETS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Micropower Boost Converter with Integrated Schottky and Output Disconnect in ThinSOT
中文描述： 0.14 A SWITCHING REGULATOR, PDSO8
封裝： 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 8 PIN
文件頁(yè)數(shù)： 8/16頁(yè)
文件大小： 260K
代理商： LT3464ETS8
LT3464
8
3464i
V
OUT
(V)
I
O
3464 F02
10
25
20
15
10
5
0
25
15
20
30
35
L = 22
μ
H
L = 47
μ
H
L = 4.7
μ
H
L = 10
μ
H
V
OUT
(V)
I
O
3464 F03
25
20
15
10
5
0
25
15
20
30
35
L = 22
μ
H
L = 47
μ
H
L = 4.7
μ
H
L = 10
μ
H
V
OUT
(V)
I
O
3464 F01
10
17.5
15.0
12.5
10.0
7.5
5.0
2.5
0
25
15
20
30
35
L = 22
μ
H
L = 10
μ
H
L = 47
μ
H
L = 4.7
μ
H
APPLICATIU
W
U
U
Choosing an Inductor
The low current limit and fast switching of the LT3464
allow the use of very small surface mount inductors. The
minimum inductor size that may be used in a given
application depends on required efficiency and output
current. Some inductors that work with the LT3464 are
listed in Table 1, although there are many other manufac-
turers and devices that can be used. Consult each manu-
facturer for more detailed information and for their entire
selection of related parts. Many different sizes and shapes
are available.
Table 1. Recommended Inductors
PART NUMBER
LQH32CN680K51
DCR (
)
2.86
CURRENT (mA)
130
MANUFACTURER
Murata
814-237-1431
www.murata.com
Panasonic
714-373-7334
www.panasonic.com
Sumida
847-956-0666
www.Sumida.com
Taiyo Yuden
408-573-4150
www.t-yuden.com
ELJPC220KF
ELJPA470KF
4.0
2.25
160
135
CMD4D11-47
2.2
180
LB2016-220
LEM2520-220
LEM2520-330
LEMC2520-220
LEMC2520-330
LEMF2520-220
LEMC3225-68
LEMC3225-100
1.0
5.5
7.1
2.7
4.8
1.2
3.3
4.3
105
125
110
160
120
105
120
100
evaluates to less than t
OFF
, then use Equation 3 to calculate
maximum output current. Otherwise, use Equation 2.
This inequality is true when the LT3464 is operating in
discontinuous mode.
LI
–
V
(
V
V
t
LIM
OUT
IN
F
OFF
)
+
<
(INEQUALITY 1)
Use this equation to calculate the maximum output current
when the LT3464 is operating in continuous mode.
I
(
LI
t
V
(
(
V
–
V
V
V
LV
2
V
V
OUT CM
2
LIM
OFF
IN
OUT
F
IN
)
CESAT
OUT
CESAT
F
(
)
+
–
–
))(
+
–
)
=
(2)
Use this equation to calculate the maximum output current
when the LT3464 is operating in discontinuous mode.
I
LI
V
(
V
LI
(
2
V t
t
V
V
V
V
OUT DCM
(
LIM
–
IN
CESAT
)(–
LIM
OFF
CESAT
IN
OUT
F
)
–
)
)
=
+
+
+
2
(3)
Where V
F
is the Schottky forward voltage, I
LIM
is the
switch current limit, t
OFF
is the switch off time, and V
CESAT
is the switch saturation voltage. See the Electrical Speci-
fications. Figures 1 through 3 show the worst-case maxi-
mum output current as given by Equations 2 and 3 using
20% inductor derating and worst-case LT3464 specifica-
tions. Also note that for some applications the maximum
output current is limited to 25mA by the output disconnect
circuitry.
The following set of formulas can be used to calculate
maximum output current given V
IN
, V
OUT
and L values.
Inequality 1 is used to determine if the LT3464 is operating
in discontinuous mode. If the left hand side of inequality 1
Figure 3. Maximum Output Current
V
IN
= 8.4V
Figure 2. Maximum Output Current
V
IN
= 5V
Figure 1. Maximum Output Current
V
IN
= 3.6V
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