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參數(shù)資料
| 型號： | LTC3618EFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-24 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 603K |
| 代理商： | LTC3618EFE#TRPBF |
LTC3618
15
3618f
The largest ripple current occurs at the highest VIN. To
guarantee that the ripple current stays below a specied
maximum, the inductor value should be chosen according
to the following equation:
L =
VOUT
fSW IL(MAX)
1–
VOUT
VIN(MAX)
Inductor Core Selection
Once the value for L is known, the type of inductor must
be selected. Actual core loss is independent of core size
for xed inductor value, but it is very dependent on the
inductance selected. As the inductance increases, core
losses decrease. Unfortunately, increased inductance
requires more turns of wire, and therefore, copper losses
will increase.
Ferrite designs have very low core losses and are pre-
ferred at high switching frequencies, so design goals can
concentrate on copper loss and preventing saturation.
Ferrite core material saturates hard, which means that
inductance collapses abruptly when the peak design current
is exceeded. This results in an abrupt increase in inductor
ripple current and consequent output voltage ripple. Do
not allow a ferrite core to saturate!
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 materials
are small and do not radiate much energy, but generally
cost more than powdered iron core inductors with similar
characteristics. The choice of which style inductor to use
mainly depends on the price versus size requirements
and any radiated eld/EMI requirements. Table 1 shows
some typical surface mount inductors that work well in
LTC3618 applications.
Input Capacitor CIN Selection
In continuous mode, the source current of the top P-
channel MOSFET is a square wave of duty cycle VOUT/VIN.
To prevent large voltage transients, a low ESR capacitor
sized for the maximum RMS current must be used for CIN.
The maximum RMS capacitor current is given by:
IRMS =IOUT(MAX)
VOUT
VIN
VIN
VOUT
–1
APPLICATIONS INFORMATION
Table 1. Representative Surface Mount Inductors
INDUCTANCE
(μH)
DCR
(mΩ)
MAX
CURRENT (A)
DIMENSIONS
(mm)
HEIGHT
(mm)
Vishay IHLP-2020BZ-01
0.33
7.6
25
5.18
× 5.49
2
0.47
8.9
21
5.18
× 5.49
2
0.68
11.2
15
5.18
× 5.49
2
1
18.9
16
5.18
× 5.49
2
Toko DE3518C Series
0.22
8
24
4.3
× 4.7
2
Sumida CDMC6D28 Series
0.3
3.2
15.4
6.7
× 7.25
3
0.47
4.2
13.6
6.7
× 7.25
3
0.68
5.4
11.3
6.7
× 7.25
3
1
8.8
6.7
× 7.25
3
NEC/Tokin MPLC0730L Series
0.47
4.5
16.6
6.9
× 7.7
3.0
0.75
7.5
12.2
6.9
× 7.7
3.0
1.0
9.0
10.6
6.9
× 7.7
3.0
Coilcraft DO1813H Series
0.33
4
10
8.9
× 6.1
5
0.56
10
7.7
8.9
× 6.1
5
Coilcraft SLC7530 Series
0.27
0.1
14
7.5
× 6.7
3
0.35
0.1
11
7.5
× 6.7
3
0.4
0.1
8
7.5
× 6.7
3
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| LTC3618EUF#PBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618EUF#TRPBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618IFE#PBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618IFE#TRPBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3618IUF#PBF | 功能描述:IC REG DUAL SYNC 3A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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