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| 型号： | LTC3406BES5-1.2#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.2V TSOT23-5 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.2V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
LTC3406B-1.2
APPLICATIO S I FOR ATIO
The basic LTC3406B-1.2 application circuit is shown in
Table 1. Representative Surface Mount Inductors
Figure 1. External component selection is driven by the
load requirement and begins with the selection of L fol-
PART
NUMBER
VALUE
( μ H)
DCR
( ? MAX)
MAX DC SIZE
CURRENT (A) W × L × H (mm 3 )
lowed by C IN and C OUT .
Inductor Selection
For most applications, the value of the inductor will fall in
the range of 1 μ H to 4.7 μ H. Its value is chosen based on the
desired ripple current. Large value inductors lower ripple
current and small value inductors result in higher ripple
currents. Higher V IN or V OUT also increases the ripple
current as shown in equation 1. A reasonable starting point
for setting ripple current is ? I L = 240mA (40% of 600mA).
Sumida
CDRH3D16
Sumida
CMD4D06
Panasonic
ELT5KT
Murata
LQH3C
1.5
2.2
3.3
4.7
2.2
3.3
4.7
3.3
4.7
1.0
2.2
4.7
0.043
0.075
0.110
0.162
0.116
0.174
0.216
0.17
0.20
0.060
0.097
0.150
1.55
1.20
1.10
0.90
0.950
0.770
0.750
1.00
0.95
1.00
0.79
0.65
3.8 × 3.8 × 1.8
3.5 × 4.3 × 0.8
4.5 × 5.4 × 1.2
2.5 × 3.2 × 2.0
V OUT ? 1 ? OUT ?
? I L =
1
( f )( L )
? V ?
? V IN ?
(1)
C IN and C OUT Selection
In continuous mode, the source current of the top MOSFET
The DC current rating of the inductor should be at least
equal to the maximum load current plus half the ripple
current to prevent core saturation. Thus, a 720mA rated
inductor should be enough for most applications (600mA
is a square wave of duty cycle V OUT /V IN . To prevent large
voltage transients, a low ESR input capacitor sized for the
maximum RMS current must be used. The maximum
RMS capacitor current is given by:
+ 120mA). For better efficiency, choose a low DC-resis-
tance inductor.
Inductor Core Selection
C IN required I RMS ? I OMAX
[ V OUT ( V IN ? V OUT ) ] 1 / 2
V IN
Different core materials and shapes will change the size/
current and price/current relationship of an inductor.
Toroid or shielded pot cores in ferrite or permalloy mate-
rials are small and don’t radiate much energy, but gener-
ally cost more than powdered iron core inductors with
similar electrical characteristics. The choice of which style
inductor to use often depends more on the price vs size
requirements and any radiated field/EMI requirements
than on what the LTC3406B-1.2 requires to operate. Table
1 shows some typical surface mount inductors that work
well in LTC3406B-1.2 applications.
This formula has a maximum at V IN = 2V OUT , where
I RMS = I OUT /2. This simple worst-case condition is com-
monly used for design because even significant deviations
do not offer much relief. Note that the capacitor
manufacturer’s ripple current ratings are often based on
2000 hours of life. This makes it advisable to further derate
the capacitor, or choose a capacitor rated at a higher
temperature than required. Always consult the manufac-
turer if there is any question.
The selection of C OUT is driven by the required effective
series resistance (ESR).
sn3406b12 3406b12fs
7
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