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| 型号： | LT3479EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INV ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 升压（升压），反相 |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.24 V ~ 42 V |
| 输入电压： | 2.5 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 3.5MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1331 (CN2011-ZH PDF) |
LT3479
APPLICATIONS INFORMATION
Capacitor Selection
Low ESR (equivalent series resistance) ceramic capaci-
tors should be used at the output to minimize the output
ripple voltage. Use only X5R or X7R dielectrics, as these
materials retain their capacitance over wider voltage and
temperature ranges better than other dielectrics. A 4.7μF
to 10μF output capacitor is suf?cient for most high output
current designs. Converters with lower output currents
may need only a 1μF or 2.2μF output capacitor.
can pass a current larger than its rated value without
damaging it. Aggressive designs where board space is
precious will exceed the maximum current rating of the
inductor to save board space. Consult each manufacturer
to determine how the maximum inductor current is
measured and how much more current the inductor can
reliably conduct.
Physically larger inductors provide better ef?ciency than
smaller ones. Figure 1 shows a 3% to 4% ef?ciency gain
Table 1. Ceramic Capacitor Manufacturers
MANUFACTURER PHONE
Taiyo Yuden (408) 573-4150
AVX (803) 448-9411
WEB
www.t-yuden.com
www.avxcorp.com
in using a larger inductor in a 1MHz, 5V to 12V application.
The ef?ciency of the TOKO FDV0630-4R7M, which mea-
sures 7mm × 7.7mm and 3 mm thick, peaks at 87%. The
smaller Sumida CDRH4D28-4R7 which is 5mm × 5mm and
3mm thick yields a peak ef?ciency of 85% in an identical
Murata
(714) 852-2001
www.murata.com
application. Thus, if board space is abundant, then larger
Inductor Selection
Several inductors that work well with the LT3479 are listed
in Table 2. However, there are many other manufacturers
inductors should be used to maximize ef?ciency.
90
85
and devices that can be used. Consult each manufacturer
for more detailed information and their entire range of
parts. Ferrite core inductors should be used to obtain the
best ef?ciency. Choose an inductor that can handle the
necessary peak current without saturating, and ensure
that the inductor has a low DCR (copper-wire resistance)
to minimize I 2 R power losses. A 4.7μH or 10μH inductor
80
75
70
65
60
55
TOKO FDV0630-4R7
SUMIDA CDRH4D28-4R7
will suf?ce for most LT3479 applications.
50
0
0.2
0.4
0.6
0.8
Inductor manufacturers specify the maximum current
rating as the current where the inductance falls to some
percentage of its nominal value—typically 65%. An inductor
Table 2. Suggested Inductors
I OUT (A)
3479 F01
Figure 1. Ef?ciency vs Inductor Size
MANUFACTURER
I DC
INDUCTANCE
MAX DCR
L × W × H
PART NUMBER
CDRH6D283R0
CDRH6D28100
CDRH4D284R7
LM N 05D B4R7M
LM N 05D B100K
LQH55DN4R7M01L
LQH55DN100M01K
FDV0630-4R7M
(A)
3
1.7
1.32
2.2
1.6
2.7
1.7
4.2
(μH)
3
10
4.7
4.7
10
4.7
10
4.7
(mΩ)
24
65
72
49
10
57
130
49
(mm)
6.7 × 6.7 × 3.0
6.7 × 6.7 × 3.0
5.0 × 5.0 × 3.0
5.9 × 6.1 × 2.8
5.9 × 6.1 × 2.8
5.7 × 5.0 × 4.7
5.7 × 5.0 × 4.7
7.0 × 7.7 × 3.0
MANUFACTURER
Sumida
www.sumida.com
Taiyo Yuden
www.t-yuden.com
Murata
www.murata.com
Toko
www.toko.com
3479fc
8
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