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LT3464 Datasheet(PDF) 8 Page - Linear Technology

Part # LT3464
Description  Micropower Boost Converter with Integrated Schottky and Output Disconnect in ThinSOT
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3464 Datasheet(HTML) 8 Page - Linear Technology

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LT3464
8
3464i
VOUT (V)
3464 F02
10
25
20
15
10
5
0
25
15
20
30
35
L = 22
µH
L = 47
µH
L = 4.7
µH
L = 10
µH
VOUT (V)
3464 F03
25
20
15
10
5
0
25
15
20
30
35
L = 22
µH
L = 47
µH
L = 4.7
µH
L = 10
µH
VOUT (V)
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
µH
L = 10
µH
L = 47
µH
L = 4.7
µH
APPLICATIO S I FOR ATIO
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
DCR (
Ω)
CURRENT (mA)
MANUFACTURER
LQH32CN680K51
2.86
130
Murata
814-237-1431
www.murata.com
ELJPC220KF
4.0
160
Panasonic
ELJPA470KF
2.25
135
714-373-7334
www.panasonic.com
CMD4D11-47
2.2
180
Sumida
847-956-0666
www.Sumida.com
LB2016-220
1.0
105
Taiyo Yuden
LEM2520-220
5.5
125
408-573-4150
LEM2520-330
7.1
110
www.t-yuden.com
LEMC2520-220
2.7
160
LEMC2520-330
4.8
120
LEMF2520-220
1.2
105
LEMC3225-68
3.3
120
LEMC3225-100
4.3
100
evaluates to less than tOFF, 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
VV
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
V
V
OUT CM
LIM
OFF IN
OUT
F
IN
CESAT
OUT
CESAT
F
()
(
(
–
–
))(
–
)
(–
)
=
+
+
2
2
(2)
Use this equation to calculate the maximum output current
when the LT3464 is operating in discontinuous mode.
I
LI
V
V
LI
V t
t
V
V
V
V
OUT DCM
LIM
IN
CESAT
LIM
IN OFF
OFF
CESAT
IN
OUT
F
()
(–
)
(
–
)(–
)
=
++
+
2
2
(3)
Where VF is the Schottky forward voltage, ILIM is the
switch current limit, tOFF is the switch off time, and VCESAT
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 VIN, VOUT 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
VIN = 8.4V
Figure 2. Maximum Output Current
VIN = 5V
Figure 1. Maximum Output Current
VIN = 3.6V



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