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参数资料
| 型号： | LTC3410ESC6-1.2 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.63 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | PLASTIC, MO-203AB, SC-70, 6 PIN |
| 文件页数： | 15/16页 |
| 文件大小： | 326K |
| 代理商： | LTC3410ESC6-1.2 |
8
LTC3410
3410fb
The basic LTC3410 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 CIN and
COUT.
Inductor Selection
For most applications, the value of the inductor will fall in
the range of 2.2
H to 4.7H. 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 VIN or VOUT also increases the ripple
current as shown in equation 1. A reasonable starting point
for setting ripple current is
IL = 120mA (40% of 300mA).
= ()( )
I
fL
V
L
OUT
IN
1
11
()
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.
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
100mA. Lower inductor values (higher
IL) 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.
APPLICATIO S I FOR ATIO
WU
UU
Inductor Core Selection
Different core materials and shapes will change the size/
current and price/current relationship of an inductor. Tor-
oid or shielded pot cores in ferrite or permalloy materials
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-
tor to use often depends more on the price vs size require-
ments and any radiated field/EMI requirements than on
what the LTC3410 requires to operate. Table 1 shows some
typical surface mount inductors that work well in
LTC3410 applications.
Table 1. Representative Surface Mount Inductors
MAX DC
MANUFACTURER PART NUMBER
VALUE CURRENT DCR HEIGHT
Taiyo Yuden
CB2016T2R2M
2.2
H 510mA 0.13 1.6mm
CB2012T2R2M
2.2
H 530mA 0.33 1.25mm
LBC2016T3R3M
3.3
H 410mA 0.27 1.6mm
Panasonic
ELT5KT4R7M
4.7
H 950mA 0.2 1.2mm
Sumida
CDRH2D18/LD
4.7
H 630mA 0.086 2mm
Murata
LQH32CN4R7M23 4.7
H 450mA 0.2 2mm
Taiyo Yuden
NR30102R2M
2.2
H 1100mA 0.1 1mm
NR30104R7M
4.7
H 750mA 0.19 1mm
FDK
FDKMIPF2520D
4.7
H 1100mA 0.11 1mm
FDKMIPF2520D
3.3
H 1200mA 0.1 1mm
FDKMIPF2520D
2.2
H 1300mA 0.08 1mm
CIN and COUT Selection
In continuous mode, the source current of the top MOSFET
is a square wave of duty cycle VOUT/VIN. 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:
C
required I
I
VV
V
IN
RMS
OMAX
OUT
IN
OUT
IN
()
[]12/
This formula has a maximum at VIN = 2VOUT, where
IRMS = IOUT/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
VIN
CIN
4.7
F
CER
VIN
2.7V
TO 5.5V
LTC3410
RUN
4.7
H
10pF
232k
464k
3410 F01
SW
VFB
GND
COUT
4.7
F
CER
VOUT
1.2V
Figure 1. High Efficiency Step-Down Converter
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| LTC3411AEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.25A 10DFN 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:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 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:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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