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LTC3442 bảng dữ liệu(PDF) 13 Page - Linear Integrated Systems

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LTC3442
13
3442f
APPLICATIO S I FOR ATIO
COMPONENT SELECTION
Table 1. Inductor Vendor Information
SUPPLIER
PHONE
FAX
WEB SITE
Coilcraft
(847) 639-6400
(847) 639-1469
www.coilcraft.com
CoEv Magnetics
(800) 227-7040
(650) 361-2508
www.circuitprotection.com/magnetics.asp
Murata
(814) 237-1431
(814) 238-0490
www.murata.com
(800) 831-9172
Sumida
USA: (847) 956-0666
USA: (847) 956-0702
www.sumida.com
Japan: 81(3) 3607-5111
Japan: 81(3) 3607-5144
TDK
(847) 803-6100
(847) 803-6296
www.component.tdk.com
TOKO
(847) 297-0070
(847) 699-7864
www.tokoam.com
Figure 6. Recommended Component Placement. Traces Carrying
High Current Should be Short and Wide. Trace Area at FB and VC
Pins are Kept Low. Lead Length to Battery Should be Kept Short.
VOUT and VIN Ceramic Capacitors Close to the IC Pins.
Inductor Selection
The high frequency operation of the LTC3442 allows the
use of small surface mount inductors. The inductor ripple
current is typically set to 20% to 40% of the maximum
inductor current. For a given ripple the inductance terms
are given as follows:
L
VV
V
fI
V
H
L
VV
V
fI
V
H
BOOST
IN MIN
OUT
IN MIN
L
OUT
BUCK
OUT
IN MAX
OUT
L
IN MAX
>
∆
>
∆
()
()
()
()
•(
–
)
••
•(
–
)
••
2
2
12
11
10
9
8
7
1
2
3
4
5
6
FB
VC
RLIM
VIN
VOUT
BURST
SHDN/SS
RT
SGND
SW1
PGND
SW2
VIN
VOUT
GND
RT
MULTIPLE
VIAS
3442 F06
VIN
where f = operating frequency, Hz
∆IL = maximum allowable inductor ripple current, A
VIN(MIN) = minimum input voltage, V
VIN(MAX) = maximum input voltage, V
VOUT = output voltage, V
IOUT(MAX) = maximum output load current
For high efficiency, choose a ferrite inductor with a high
frequency core material to reduce core loses. The inductor
should have low ESR (equivalent series resistance) to
reduce the I2R losses, and must be able to handle the peak
inductor current without saturating. Molded chokes or
chip inductors usually do not have enough core to support
the peak inductor currents in the 1A to 2A region. To
minimize radiated noise, use a shielded inductor. See
Table 1 for a suggested list of inductor suppliers.
Output Capacitor Selection
The bulk value of the output filter capacitor is set to reduce
the ripple due to charge into the capacitor each cycle. The
steady state ripple due to charge is given by:
% RIPPLE_BOOST =
IV
V
CV
f
OUT MAX
OUT
IN MIN
OUT
OUT
()
(
)
•(
–
) •
••
%
100
2
% RIPPLE_BUCK =
IV
V
CV
V
f
OUT MAX
IN MAX
OUT
OUT
IN MAX
OUT
()
()
()
•(
–
) •
••
•
%
100
where COUT = output filter capacitor in Farads and
f = switching frequency in Hz.



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