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參數(shù)資料
| 型號： | LTC3410BESC6-1.8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.63 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | PLASTIC, MO-203AB, SC-70, 6 PIN |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 285K |
| 代理商： | LTC3410BESC6-1.8 |
8
LTC3410B
3410bfa
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
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
(1)
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.
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 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
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 MOS-
FET 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 maxi-
mum RMS capacitor current is given by:
CI
VV
V
IN
OMAX
OUT
IN
OUT
required IRMS
()
1/2
2
VIN
Figure 1. High Efficiency Step-Down Converter
VIN
CIN
2.2
F
CER
VIN
2.7V
TO 5.5V
LTC3410B
RUN
4.7
H
10pF
232k
464k
3410 F01
SW
VFB
GND
COUT
2.2
F
CER
VOUT
1.2V
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