參數(shù)資料
型號(hào)： LTC3411
廠商： Linear Technology Corporation
英文描述： 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
中文描述： 電流1.25A，4MHz，同步降壓型DC / DC轉(zhuǎn)換器
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 288K
代理商： LTC3411
LTC3411
9
sn3411 3411fs
APPLICATIU
typical surface mount inductors that work well in LTC3411
applications.
W
U
U
Table 1. Representative Surface Mount Inductors
MANU-
FACTURER PART NUMBER
Toko
A914BYW-2R2M-D52LC 2.2
μ
H
Toko
A915AY-2ROM-D53LC
Coilcraft
D01608C-222
Coilcraft
LP01704-222M
Sumida
CDRH4D282R2
Sumida
CDC5D232R2
Taiyo Yuden N06DB2R2M
Taiyo Yuden N05DB2R2M
Murata
LQN6C2R2M04
MAX DC
VALUE CURRENT DCR
2.05A
2
μ
H
3.3A
2.2
μ
H
2.3A
2.2
μ
H
2.4A
2.2
μ
H
2.04A
2.2
μ
H
2.16A
2.2
μ
H
3.2A
2.2
μ
H
2.9A
2.2
μ
H
3.2A
HEIGHT
2mm
3mm
3mm
49m
22m
70m
120m
1mm
23m
30m
2.5mm
29m
3.2mm
32m
2.8mm
24m
3mm
5mm
Catch Diode Selection
Although unnecessary in most applications, a small im-
provement in efficiency can be obtained in a few applica-
tions by including the optional diode D1 shown in Figure5,
which conducts when the synchronous switch is off.
When using Burst Mode operation or pulse skip mode, the
synchronous switch is turned off at a low current and the
remaining current will be carried by the optional diode. It
is important to adequately specify the diode peak current
and average power dissipation so as not to exceed the
diode ratings. The main problem with Schottky diodes is
that their parasitic capacitance reduces the efficiency,
usually negating the possible benefits for LTC3411 cir-
cuits. Another problem that a Schottky diode can intro-
duce is higher leakage current at high temperatures, which
could reduce the low current efficiency.
Remember to keep lead lengths short and observe proper
grounding (see Board Layout Considerations) to avoid
ringing and increased dissipation when using a catch
diode.
Input Capacitor (C
IN
) Selection
In continuous mode, the input current of the converter is
a square wave with a duty cycle of approximately V
OUT
/
V
IN
. To prevent large voltage transients, a low equivalent
series resistance (ESR) input capacitor sized for the maxi-
mum RMS current must be used. The maximum RMS
capacitor current is given by:
I
I
V
V
V
V
RMS
MAX
OUT
IN
OUT
IN
≈
(
)
where the maximum average output current I
MAX
equals
the peak current minus half the peak-to-peak ripple cur-
rent, I
MAX
= I
LIM
–
I
L
/2.
This formula has a maximum at V
IN
= 2V
OUT
, where
I
RMS
= I
OUT
/2. This simple worst case is commonly used
to design because even significant deviations do not offer
much relief. Note that capacitor manufacturer’s ripple
current ratings are often based on only 2000 hours life-
time. This makes it advisable to further derate the capaci-
tor, or choose a capacitor rated at a higher temperature
than required. Several capacitors may also be paralleled to
meet the size or height requirements of the design. An
additional 0.1
μ
F to 1
μ
F ceramic capacitor is also recom-
mended on V
IN
for high frequency decoupling, when not
using an all ceramic capacitor solution.
Output Capacitor (C
OUT
) Selection
The selection of C
OUT
is driven by the required ESR to
minimize voltage ripple and load step transients. Typically,
once the ESR requirement is satisfied, the capacitance is
adequate for filtering. The output ripple (
V
OUT
) is deter-
mined by:
≈
+
V
I ESR
f C
8
OUT
OUT
1
where f = operating frequency, C
OUT
= output capacitance
and
I
L
= ripple current in the inductor. The output ripple
is highest at maximum input voltage since
I
L
increases
with input voltage. With
I
L
= 0.3 I
LIM
the output ripple
will be less than 100mV at maximum V
IN
and f
O
= 1MHz
with:
ESRC
OUT
< 150m
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3411A 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
LTC3411AEDD#PBF 功能描述:IC REG BUCK SYNC ADJ 1.25A 10DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:升壓（升壓） 輸出類(lèi)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類(lèi)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
LTC3411AEDD#TRPBF 功能描述:IC REG BUCK SYNC ADJ 1.25A 10DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:升壓（升壓） 輸出類(lèi)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類(lèi)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
LTC3411AEDD-PBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
LTC3411AEDD-TRPBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:1.25A, 4MHz, Synchronous Step-Down DC/DC Converter
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