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參數(shù)資料
| 型號： | LTC3564IDCB#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 3 MM, LEAD FREE, PLASTIC, MO-229TBD, DFN-6 |
| 文件頁數(shù)： | 9/9頁 |
| 文件大?。?/td> | 271K |
| 代理商： | LTC3564IDCB#PBF |
9
LTC3564
3564f
The basic LTC3564 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 0.47
μH to 2.2μH. 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 = 500mA (40% of 1.25A).
Δ = ()( )
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 1.5A rated
inductor should be enough for most applications (1.25A
+ 250mA). For better efficiency, choose a low DC-resis-
tance 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
300mA. Lower inductor values (higher
ΔIL) 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.
Inductor Core Selection
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 mate-
rials are small and don’t radiate much energy, but gener-
ally 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 field/EMI requirements
than on what the LTC3564 requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3564 applications.
APPLICATIO S I FOR ATIO
WU
U
Table 1. Representative Surface Mount Inductors
MANUFATURER
PART NUMBER
VALUE (
μH)
MAX DC CURRENT (A)
DCR (m
Ω)
HEIGHT (mm)
Toko
A915AY-1R1M-DC53LC
1.1
3.25
16
3
1070AS-1R0N-DB3020C
1
1.9
47
2
Sumida
CDRH4D18C/LD-1R1
1.1
2.1
24
2
CDRH3D14-1R2
1.2
2.2
36
1.5
CR5D11-1R0
1
2.2
40
1.2
CDRH2D18/HP-2R2
2.2
1.6
48
2
FDK
MIPW3226D0R9M
0.9
1.4
70
1
Coilcraft
LPO6610-122ML
1.2
2.1
80
1
LPS4018-222ML
2.2
2.5
70
1.8
Vishay
IHLP1616ABERR47M01
0.47
5
20
1.2
IHLP1616ABER1R0M01
1
4
45
1.2
VIN
LTC3564
RUN
R1
3564 F01
R2
CF
L
CIN
COUT
SW
VIN
VOUT
VFB
GND
Figure 1. LTC3564 General Schematic
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3564IDCB-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.25MHz, 1.25A Synchronous Step-Down Regulator |
| LTC3564IS5#PBF | 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 2.25MHz, 1.2A Synchronous Step-Down Regulator in T |
| LTC3564IS5#TRMPBF | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC3564IS5#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC3564IS5-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.25MHz, 1.25A Synchronous Step-Down Regulator |
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