LTC3672B-1
9
3672B1f
APPLICATIONS INFORMATION
Table 1. Recommended Inductors for the Buck Regulator
INDUCTOR TYPE
L
(糎)
MAX I
DC
(A)
MAX DCR
(?/SPAN>)
SIZE IN mm
(L ?/SPAN> W ?/SPAN> H)
MANUFACTURER
DB318C
D312C
DE2812C
4.7
3.3
4.7
3.3
4.7
3.3
1.07
1.2
0.79
0.9
1.15
1.37
0.1
0.07
0.24
0.2
0.13*
0.105*
3.8 ?3.8 ?1.8
3.8 ?3.8 ?1.8
3.6 ?3.6 ?1.2
3.6 ?3.6 ?1.2
3 ?2.8 ?1.2
3 ?2.8 ?1.2
Toko
www.toko.com
CDRH3D16
CDRH2D11
CLS4D09
4.7
3.3
4.7
3.3
4.7
0.9
1.1
0.5
0.6
0.75
0.11
0.085
0.17
0.123
0.19
4 ?4 ?1.8
4 ?4 ?1.8
3.2 ?3.2 ?1.2
3.2 ?3.2 ?1.2
4.9 ?4.9 ?1
Sumida
www.sumida.com
SD3118
SD3112
SD12
SD10
4.7
3.3
4.7
3.3
4.7
3.3
4.7
3.3
1.3
1.59
0.8
0.97
1.29
1.42
1.08
1.31
0.162
0.113
0.246
0.165
0.117*
0.104*
0.153*
0.108*
3.1 ?3.1 ?1.8
3.1 ?3.1 ?1.8
3.1 ?3.1 ?1.2
3.1 ?3.1 ?1.2
5.2 ?5.2 ?1.2
5.2 ?5.2 ?1.2
5.2 ?5.2 ?1
5.2 ?5.2 ?1
Cooper
www.cooperet.com
LPS3015
4.7
3.3
1.1
1.3
0.2
0.13
3 ?3 ?1.5
3 ?3 ?1.5
Coil Craft
www.coilcraft.com
* = Typical DCR
INPUT/OUTPUT CAPACITOR SELECTION
Low ESR (equivalent series resistance) ceramic capacitors
should be used to bypass the following pins to ground:
V
IN
, V
IN1
, the buck output, LDO1, and LDO2. Only X5R
or X7R ceramic capacitors should be used because they
retain their capacitance over wider voltage and temperature
ranges than other ceramic types. A 10糉 output capaci-
tor is suf cient for the buck regulator output. For good
transient response and stability the output capacitor for
the buck regulator should retain at least 4糉 of capaci-
tance over operating temperature and bias voltage. The
V
IN
pin should be bypassed with a 2.2糉 capacitor. The
LDO1 and LDO2 output pins should be bypassed with a
1糉 capacitor or greater. V
IN1
should be bypassed with a
1糉 capacitor, which may be omitted if V
IN1
is tied to the
buck regulators output capacitor.
Consult with capacitor manufacturers for detailed infor-
mation on their selection and speci cations of ceramic
capacitors. Many manufacturers now offer very thin (<1mm
tall) ceramic capacitors ideal for use in height-restricted
designs. Table 2 shows a list of several ceramic capacitor
manufacturers.
Table 2. Ceramic Capacitor Manufacturers
AVX
www.avxcorp.com
Murata
www.murata.com
Taiyo Yuden
www.t-yuden.com
Vishay Siliconix
www.vishay.com
TDK
www.tdk.com
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