参数资料
型号: LTC3670EDDB#TRPBF
厂商: Linear Technology
文件页数: 9/12页
文件大小: 210K
描述: IC REG TRPL BCK/LINEAR 12DFN
标准包装: 2,500
拓扑: 降压(降压)同步(1),线性(LDO)(2)
功能: 任何功能
输出数: 3
频率 - 开关: 2.25MHz
电压/电流 - 输出 1: 可调至0.8V,400mA
电压/电流 - 输出 2: 可调至0.8V,150mA
电压/电流 - 输出 3: 可调至0.8V,150mA
带 LED 驱动器:
带监控器:
带序列发生器:
电源电压: 2.5 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 12-WFDFN 裸露焊盘
供应商设备封装: 12-DFN-EP(3x2)
包装: 带卷 (TR)
LTC3670
9
3670f
 APPLICATIONS INFORMATION
Buck Regulator Inductor Selection
Many different sizes and shapes of inductors are avail-
able from numerous manufacturers. Choosing the right
inductor from such a large selection of devices can be
overwhelming, but following a few basic guidelines will
make the selection process much simpler.
The buck regulator is designed to work with inductors in
the range of 2.2糎 to 10糎. A 4.7糎 inductor is a good
starting point. Larger value inductors reduce ripple cur-
rent which improves output ripple voltage. Lower value
inductors result in higher ripple current and improved
transient response time. To maximize ef ciency, choose
an inductor with a low DC resistance. Choose an inductor
with a DC current rating at least 1.5 times larger than the
maximum load current to ensure that the inductor does not
saturate during normal operation. If output short-circuit
is a possible condition, the inductor should be rated to
handle the maximum peak current speci ed for the buck
regulator.
Different core materials and shapes will change the size/cur-
rent and price/current relationship of an inductor. Toroid
or shielded pot cores in ferrite or Permalloy materials
are small and do not radiate much energy, but generally
cost more than powdered iron core inductors with similar
electrical characteristics. Inductors that are very thin or
have a very small volume typically have much higher core
and DCR losses, and will not give the best ef ciency. The
choice of which style inductor to use often depends more
on the price vs size, performance, and any radiated EMI
requirements than on what the buck regulator needs to
operate.
Table 1 shows several inductors that work well with the
buck regulator. These inductors offer a good compromise
in current rating, DCR and physical size. Consult each
manufacturer for detailed information on their entire
selection of inductors.
Table 1. Recommended Inductors for the Buck Regulator
INDUCTOR TYPE
L
(糎)
MAXIMUM I
DC
 
(A)
MAXIMUM DCR
(?
SIZE in mm
(L ?/SPAN> W ?/SPAN> H)    MANUFACTURER
EPL2014-472ML  4.7
1.3
0.254
1.8 ?2.0 ?1.4
Coilcraft
www.coilcraft.com
LPS3015
4.7
3.3
1.1
1.3
0.2
0.13
3.0 ?3.0 ?1.5
3.0 ?3.0 ?1.5
DE2818C
4.7
3.3
1.25
1.45
0.072
0.053
3.0 ?2.8 ?1.8
3.0 ?2.8 ?1.8
Toko
www.toko.com
DE2812C
4.7
3.3
1.15
1.37
0.13*
0.105*
3.0 ?2.8 ?1.2
3.0 ?2.8 ?1.2
CDRH3D16
4.7
0.9
0.11
4.0 ?4.0 ?1.8
Sumida
www.sumida.com
CDRH2D11
4.7
3.3
0.5
0.6
0.17
0.123
3.2 ?3.2 ?1.2
3.2 ?3.2 ?1.2
SD3118
4.7
3.3
1.3
1.59
0.162
0.113
3.1 ?3.1 ?1.8
3.1 ?3.1 ?1.8
Cooper
www.cooperet.com
*Typical DCR
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