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| 型号： | LTC3410BESC6-1.8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V .3A SC70-6 |
| 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： | 1.8V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 300mA |
| 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： | 6-TSSOP，SC-88，SOT-363 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SC-70-6 |
LTC3410B
APPLICATIO S I FOR ATIO
V IN
2.7V
TO 5.5V
C IN
2.2 μ F
CER
V IN SW
LTC3410B
RUN
4.7 μ H
10pF
C OUT
2.2 μ F
CER
V OUT
1.2V
Inductor Core Selection
Different core materials and shapes will change the size/
current and price/current relationship of an inductor. Tor-
V FB
oid or shielded pot cores in ferrite or permalloy materials
GND
232k
464k
3410 F01
are small and don’t radiate much energy, but generally cost
more than powdered iron core inductors with similar
electrical characteristics. The choice of which style induc-
Figure 1. High Efficiency Step-Down Converter
The basic LTC3410B application circuit is shown in Fig-
ure 1. External component selection is driven by the load
requirement and begins with the selection of L followed by
C IN and C OUT .
tor to use often depends more on the price vs size require-
ments and any radiated field/EMI requirements than on
what the LTC3410B requires to operate. Table 1 shows
some typical surface mount inductors that work well in
LTC3410B applications.
Table 1. Representative Surface Mount Inductors
MAX DC
Inductor Selection
For most applications, the value of the inductor will fall in
the range of 2.2 μ H to 4.7 μ H. Its value is chosen based on
the desired ripple current. Large value inductors lower
MANUFACTURER PART NUMBER
Taiyo Yuden CB2016T2R2M
CB2012T2R2M
LBC2016T3R3M
Panasonic ELT5KT4R7M
VALUE CURRENT DCR HEIGHT
2.2 μ H 510mA 0.13 ? 1.6mm
2.2 μ H 530mA 0.33 ? 1.25mm
3.3 μ H 410mA 0.27 ? 1.6mm
4.7 μ H 950mA 0.2 ? 1.2mm
ripple current and small value inductors result in higher
Sumida
CDRH2D18/LD
4.7 μ H
630mA 0.086 ? 2mm
ripple currents. Higher V IN or V OUT also increases the ripple
Murata
LQH32CN4R7M23 4.7 μ H
450mA
0.2 ?
2mm
? I L OUT ? 1 ? OUT ?
=
1 ? V ?
( )( ) L
V
?
V IN ?
f
currentasshowninEquation1.Areasonablestartingpoint
for setting ripple current is ? I L = 120mA (40% of 300mA).
(1)
Taiyo Yuden
FDK
NR30102R2M
NR30104R7M
FDKMIPF2520D
FDKMIPF2520D
FDKMIPF2520D
2.2 μ H
4.7 μ H
4.7 μ H
3.3 μ H
2.2 μ H
1100mA 0.1 ? 1mm
750mA 0.19 ? 1mm
1100mA 0.11 ? 1mm
1200mA 0.1 ? 1mm
1300mA 0.08 ? 1mm
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 360mA rated
inductor should be enough for most applications (300mA
+ 60mA). For better efficiency, choose a low DC-resistance
inductor.
C IN and C OUT Selection
In continuous mode, the source current of the top MOS-
FET 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 maxi-
mum RMS capacitor current is given by:
?? V OUT ( V IN ? V OUT ) ??
C IN required I RMS ? I OMAX
V IN
1/22
3410bfa
8
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| LTC3410ESC6#TRMPBF | 功能描述:IC REG BUCK SYNC ADJ 0.3A SC70-6 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 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:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR |
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