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參數(shù)資料
| 型號： | LTC3543EDCB#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229, DFN-6 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大?。?/td> | 329K |
| 代理商： | LTC3543EDCB#PBF |
LTC3543
11
3543fa
The basic LTC3543 application circuit is shown on the
front page of this data sheet. External component selec-
tion 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 1μH to 4.7μH. 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
ΔIL = 130mA
20% ILOAD(MAX).
ΔI
V
fL
V
L
OUT
IN
=
1
(1)
TheDCcurrentratingoftheinductorshouldbeatleastequal
to the maximum load current plus half the ripple current
to prevent core saturation. Thus, a 665mA rated induc-
tor should be enough for most applications (600mA +
65mA). For better efciency, choose a low DC-resistance
inductor.
The inductor value also has an effect on Burst Mode opera-
tion. The transition to low current operation begins when
the inductor current peaks fall to approximately 100mA.
Lower inductor values (higher
ΔIL) will cause this to occur
at lower load currents, which can cause a dip in efciency
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 induc-
tor. Toroid or shielded pot cores in ferrite or permalloy
materials are small and do not radiate much en-
ergy, but generally cost more than powdered iron core
inductors with similar electrical characteristics. The choice
of which style inductor to use often depends more on the
price vs size requirements, and any radiated eld/EMI re-
quirements, than on what the LTC3543 requires to operate.
Table 1 shows some typical surface mount inductors that
work well in LTC3543 applications.
APPLICATIONS INFORMATION
Table 1. Representative Surface Mount Inductors
MANUFACTURER
PART NUMBER
VALUE (μH)
MAX DC CURRENT (A)
DCR (m
Ω)
HEIGHT (mm)
TDK
VLF3010AT-2R2M1R0
2.2
1.0
100
1.0
VLF3012AT-2R2M1R0
2.2
1.0
88
1.2
VLCF4020T-2R2N1R7
2.2
1.7
54
2.0
VLCF5020-2R7N1R7
2.7
1.7
58
2.0
VLCF5020-3R3N1R6
3.3
1.6
69
2.0
VLCF5020-4R7N1R4
4.7
1.4
79
2.0
Sumida
CDRH2D18/HP-2R2NC
2.2
1.6
48
2.0
Taiyo Yuden
NR4018T4R7M
4.7
1.7
90
1.8
NP03SB4R7M
4.7
1.2
47
1.8
CoEv
DN4835-2R2
2.2
2.6
47
3.5
DN4835-3R3
3.3
2.43
58
3.5
DN4835-6R8
6.8
1.41
117
3.5
Murata
LQH32CN2R2M33
2.2
0.79
97
3.2
LQH55DN2R2M03
2.2
3.2
29
4.7
LQH55DN3R3M03
3.3
2.9
36
4.7
LQH55DN4R7M03
4.7
2.7
41
4.7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3544 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
| LTC3544B | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
| LTC3544BEUD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
| LTC3544BEUD#PBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3544BEUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
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