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| 型号： | LTC3406ES5-1.8#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V TSOT23-5 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.8V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 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： | 剪切带 (CT) |
| 供应商设备封装： | TSOT-23-5 |
| 其它名称： | LTC3406ES5-1.8 LTC3406ES5-1.8#TRMCT LTC3406ES5-1.8-ND |
LTC3406
LTC3406-1.5/LTC3406-1.8
APPLICATIO S I FOR ATIO
The basic LTC3406 application circuit is shown in Figure 1.
External component selection is driven by the load require-
ment and begins with the selection of L followed by C IN and
C OUT .
inductor to use often depends more on the price vs size
requirements and any radiated field/EMI requirements
than on what the LTC3406 requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3406 applications.
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
Table 1. Representative Surface Mount Inductors
PART VALUE DCR MAX DC SIZE
NUMBER ( μ H) ( ? MAX) CURRENT (A) W × L × H (mm 3 )
Sumida 1.5 0.043 1.55 3.8 × 3.8 × 1.8
CDRH3D16 2.2 0.075 1.20
currents. Higher V IN or V OUT also increases the ripple
current as shown in equation 1. A reasonable starting point
3.3
4.7
0.110
0.162
1.10
0.90
for setting ripple current is ? I L = 240mA (40% of 600mA).
Sumida
CMD4D06
2.2
3.3
0.116
0.174
0.950
0.770
3.5 × 4.3 × 0.8
V OUT ? 1 ? OUT ?
? I L =
1
( f )( L )
? V ?
? V IN ?
(1)
Panasonic
ELT5KT
4.7
3.3
4.7
0.216
0.17
0.20
0.750
1.00
0.95
4.5 × 5.4 × 1.2
The DC current rating of the inductor should be at least
equal to the maximum load current plus half the ripple
Murata
LQH32CN
1.0
2.2
4.7
0.060
0.097
0.150
1.00
0.79
0.65
2.5 × 3.2 × 2.0
current to prevent core saturation. Thus, a 720mA rated
[ V OUT ( V IN OUT ) ] 1 / 2
inductorshouldbeenoughformostapplications(600mA
+ 120mA). For better efficiency, choose a low DC-resis-
tance inductor.
The inductor value also has an effect on Burst Mode
operation. The transition to low current operation begins
when the inductor current peaks fall to approximately
200mA. Lower inductor values (higher ? I L ) will cause this
to occur at lower load currents, which can cause a dip in
efficiency in the upper range of low current operation. In
Burst Mode operation, lower inductance values will cause
the burst frequency to increase.
Inductor Core Selection
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
C IN and C OUT Selection
In continuous mode, the source current of the top MOSFET
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:
? V
C IN required I RMS ? I OMAX
V IN
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.
3406fa
8
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