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| 型号： | LTC3104EMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 339K |
| 描述： | IC REG DL BCK/LINEAR 16-MSOP |
| 标准包装： | 37 |
| 拓扑： | 降压（降压）同步（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 1.2MHz |
| 电压/电流 - 输出 1： | 0.6 V ~ 13.8 V，300mA |
| 电压/电流 - 输出 2： | 0.6 V ~ 14.5 V，10mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 2.5 V ~ 15 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
| 包装： | 管件 |
LTC3104
12
3104f
APPLICATIONS INFORMATION
The basic LTC3104 application circuit is shown as the
Typical Application on the front page of this data sheet.
The external component selection is determined by the
desired output voltage, output current, desired noise im-
munity and ripple voltage requirements for each particular
application. However, basic guidelines and considerations
for the design process are provided in this section.
Inductor Selection
The choice of inductor value influences both the efficiency
and the magnitude of the output voltage ripple. Larger in-
ductance values will reduce inductor current ripple and will
therefore lead to lower output voltage ripple. For a fixed DC
resistance, a larger value inductor will yield higher efficiency
by lowering the peak current to be closer to the average.
However, a larger value inductor within the same family
will generally have a greater series resistance, thereby
offsetting this efficiency advantage. Given a desired peak
to peak current ripple, I
L
(A), the required inductance
can be calculated via the following expression:
Le
V
OUT
1.2 I
L
1
V
OUT
V
IN
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
礖
( )
A reasonable choice for ripple current is I
L
= 120mA
which represents 40% of the maximum 300mA load
current. The DC current rating of the inductor should be
at least equal to the maximum load current plus half the
ripple current in order to prevent core saturation and loss
of efficiency during operation. To optimize efficiency the
inductor should have a low series resistance. In particularly
space restricted applications it may be advantageous to
use a much smaller value inductor at the expense of larger
ripple current. In such cases, the converter will operate
in discontinuous conduction for a wider range of output
loads and efficiency will be reduced. In addition, there is a
minimum inductor value required to maintain stability of the
current loop (given the fixed internal slope compensation).
Specifically, if the buck converter is going to be utilized at
duty cycles greater than 40%, the inductance value must
be at least L
MIN
as given by the following equation:
L
MIN
e 2.5 " V
OUT
(礖)
Table 1 depicts the minimum required inductance for
several common output voltages using standard induc-
tor values.
Table 1. Minimum Inductance
OUTPUT VOLTAGE (V)
MINIMUM INDUCTANCE (礖)
0.8
2.2
1.2
3.3
2.0
5.6
2.7
6.8
3.3
8.3
5.0
15
A large variety of low ESR, power inductors are available
that are well suited to the LTC3104 converter applications.
The trade-off generally involves PCB area, application
height, required output current and efficiency. Table 2
provides a representative sampling of small surface mount
inductors that are well suited for use with the LTC3104
buck converter. The inductor specifications listed are for
comparison purposes but other values within these induc-
tor families are generally well suited to this application
as well. Within each family (i.e., at a fixed inductor size),
the DC resistance generally increases and the maximum
current generally decreases with increased inductance.
Output Capacitor Selection
A low ESR output capacitor should be utilized at the buck
output in order to minimize voltage ripple. Multilayer ce-
ramic capacitors are an excellent choice as they have low
ESR and are available in small footprints. In addition to
controlling the output ripple magnitude, the value of the
output capacitor also sets the loop crossover frequency
and therefore can impact loop stability. There is both a
minimum and maximum capacitance value required to
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