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參數(shù)資料
| 型號： | LTC3200-5 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Noise, Regulated Charge Pump DC/DC Converters(5V輸出，低噪聲，穩(wěn)壓型，電荷泵DC/DC變換器（6-腳SOT-23封裝）) |
| 中文描述： | 低噪聲，穩(wěn)壓電荷泵DC / DC轉(zhuǎn)換器（5V的輸出，低噪聲，穩(wěn)壓型，電荷泵型DC / DC變換器（6 -腳的SOT - 23封裝）） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 178K |
| 代理商： | LTC3200-5 |
LTC3200/LTC3200-5
7
Tantalum and aluminum capacitors are not recommended
because of their high ESR.
The value of C
OUT
directly controls the amount of output
ripple for a given load current. Increasing the size of C
OUT
will reduce the output ripple at the expense of higher
minimum turn on time and higher start-up current. The
peak-to-peak output ripple is approximately given by the
expression:
I
f
C
OSC
OUT
V
RIPPLEP P
OUT
2
Where f
OSC
is the LTC3200/LTC3200-5’s oscillator fre-
quency (typically 2MHz) and C
OUT
is the output charge
storage capacitor.
Both the style and value of the output capacitor can signifi-
cantly affect the stability of the LTC3200/LTC3200-5. As
shown in the Block Diagrams, the LTC3200/LTC3200-5
use a linear control loop to adjust the strength of the charge
pump to match the current required at the output. The
error signal of this loop is stored directly on the output
charge storage capacitor. The charge storage capacitor
also serves to form the dominant pole for the control loop.
To prevent ringing or instability on the LTC3200-5 it is
important for the output capacitor to maintain at least 0.47
μ
F
of capacitance over all conditions. On the adjustable
LTC3200 the output capacitor should be at least 0.47
μ
F
×
5V/V
OUT
to account for the alternate gain factor.
Likewise excessive ESR on the output capacitor will tend
to degrade the loop stability of the LTC3200/LTC3200-5.
The closed loop output resistance of the LTC3200-5 is
designed to be 0.5
. For a 100mA load current change,
the output voltage will change by about 50mV. If the output
capacitor has 0.3
or more of ESR, the closed loop
frequency response will cease to roll off in a simple one
pole fashion and poor load transient response or instabil-
ity could result. Ceramic capacitors typically have excep-
tional ESR performance and combined with a tight board
layout should yield very good stability and load transient
performance.
As the value of C
OUT
controls the amount of output ripple,
the value of C
IN
controls the amount of ripple present at
the input pin (V
IN
). The input current to the LTC3200/
LTC3200-5 will be relatively constant while the charge
pump is on either the input charging phase or the output
nonoverlap times. Since the nonoverlap time is small
(~25ns), these missing “notches” will result in only a
small perturbation on the input power supply line. Note
that a higher ESR capacitor such as tantalum will have
higher input noise due to the input current change times
the ESR. Therefore ceramic capacitors are again recom-
mended for their exceptional ESR performance.
Further input noise reduction can be achieved by powering
the LTC3200/LTC3200-5 through a very small series in-
ductor as shown in Figure 2. A 10nH inductor will reject the
fast current notches, thereby presenting a nearly constant
current load to the input power supply. For economy the
10nH inductor can be fabricated on the PC board with
about 1cm (0.4") of PC board trace.
OPERATIOU
Figure 2. 10nH Inductor Used for
Additional Input Noise Reduction
LTC3200/
LTC3200-5
0.22
μ
F
1
μ
F
V
IN
GND
10nH
V
IN
32005 F02
Flying Capacitor Selection
Warning: A polarized capacitor such as tantalum or
aluminum should never be used for the flying capacitor
since ts voltage can reverse upon start-up of he LTC3200/
LTC3200-5. Low ESR ceramic capacitors should always
be used for the flying capacitor.
The flying capacitor controls the strength of the charge
pump. In order to achieve the rated output current it is
necessary to have at least 0.68
μ
F of capacitance for the
flying capacitor.
For very light load applications the flying capacitor may be
reduced to save space or cost. The theoretical minimum
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3200EMS8 | 功能描述:IC REG SWITCHED CAP DBL 8MSOP RoHS:否 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:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關(guān):900kHz 電流 - 輸出:100mA 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:SOT-23-6 細(xì)型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR |
| LTC3200EMS8#PBF | 功能描述:IC REG SWITCHED CAP DBL 8MSOP 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:500 系列:- 類型:切換式電容器（充電泵），反相 輸出類型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開關(guān):900kHz 電流 - 輸出:100mA 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:SOT-23-6 細(xì)型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱:LTC1983ES6-3#TRMTR |
| LTC3200EMS8#TR | 功能描述:IC REG SWITCHED CAP DBL 8MSOP RoHS:否 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 |
| LTC3200EMS8#TRPBF | 功能描述:IC REG SWITCHED CAP DBL 8MSOP 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 |
| LTC3200EMS8PBF | 制造商:Linear Technology 功能描述:LTC3200 adj 100mA CP SU dc-dc converter |
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