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參數(shù)資料
| 型號(hào)： | LTC3200 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Low Noise, Regulated Charge Pump DC/DC Converters(可調(diào)輸出，低噪聲，穩(wěn)壓型，電荷泵DC/DC變換器（8-腳MSOP封裝）) |
| 中文描述： | 低噪聲，穩(wěn)壓電荷泵DC / DC轉(zhuǎn)換器（可調(diào)輸出，低噪聲，穩(wěn)壓型，電荷泵型DC / DC變換器（8 -腳型MSOP封裝）） |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 178K |
| 代理商： | LTC3200 |
LTC3200/LTC3200-5
8
output resistance of a voltage doubling charge pump is
given by:
R
V
V
I
f
OUT MIN
(
IN
OUT
OUT
OSC FLY
)
–
≡
2
1
Where f
OSC
is the switching frequency (2MHz typ) and
C
FLY
is the value of the flying capacitor. The charge pump
will typically be weaker than the theoretical limit due to
additional switch resistance, however for very light load
applications the above expression can be used as a guide-
line in determining a starting capacitor value.
Ceramic Capacitors
Ceramic capacitors of different materials lose their capaci-
tance with higher temperature and voltage at different
rates. For example, a capacitor made of X5R or X7R
material will retain most of its capacitance from –40
°
C to
85
°
C whereas a Z5U or Y5V style capacitor will lose
considerable capacitance over that range. Z5U and Y5V
capacitors may also have a very poor voltage coefficient
causing them to lose 60% or more of their capacitance
when the rated voltage
is applied. Therefore, when com-
paring different capacitors it is often more appropriate to
compare the amount of achievable capacitance for a given
case size rather than discussing the specified capacitance
value. For example, over rated voltage and temperature
conditions, a 1
μ
F, 10V, Y5V ceramic capacitor in an 0603
case may not provide any more capacitance than a
0.22
μ
F, 10V, X7R available in the same 0603 case. In fact
for most LTC3200/LTC3200-5 applications these capaci-
tors can be considered roughly equivalent . The capacitor
manufacturer’s data sheet should be consulted to deter-
mine what value of capacitor is needed to ensure the
desired capacitance at all temperatures and voltages.
Below is a list of ceramic capacitor manufacturers and
how to contact them:
AVX
Kemet
Murata
Taiyo-Yuden
Vishay
1-(803)-448-1943
1-(864)-963-6300
1-(800)-831-9172
1-(800)-348-2496
1-(800)-487-9437
www.avxcorp.com
www.kemet.com
www.murata.com
www.t-yuden.com
www.vishay.com
Power Efficiency
The power efficiency (
η
) of the LTC3200/LTC3200-5 is
similar to that of a linear regulator with an effective input
voltage of twice the actual input voltage. This occurs
because the input current for a voltage doubling charge
pump is approximately twice the output current. In an ideal
regulating voltage doubler the power efficiency would be
given by:
η ≡
=
=
P
P
V
V
I
I
V
2
V
OUT
IN
OUT
OUT
IN
OUT
OUT
IN
2
At moderate to high output power the switching losses
and quiescent current of the LTC3200/LTC3200-5 are
negligible and the expression above is valid. For example
with V
IN
= 3V, I
OUT
= 50mA and V
OUT
regulating to 5V the
measured efficiency is 80% which is in close agreement
with the theoretical 83.3% calculation.
Operation at V
IN
> 5V
LTC3200/LTC3200-5 will continue to operate with input
voltages somewhat above 5V. However, because of its
constant frequency nature, some charge due to internal
switching will be coupled to V
OUT
causing a slight upward
movement of the output voltage at very light loads. To
avoid an output overvoltage problem with high V
IN
, a
moderate standing load current of 1mA will help the
LTC3200/LTC3200-5 maintain exceptional line regula-
tion. This can be achieved with a 5k resistor from V
OUT
to
GND.
Layout Considerations
Due to its high switching frequency and the high transient
currents produced by the LTC3200/LTC3200-5, careful
board layout is necessary. A true ground plane and short
connections to all capacitors will improve performance and
ensure proper regulation under all conditions. Figure 3
shows an example layout for the LTC3200-5.
OPERATIOU
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3200-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:DC/DC CONVERTERl |
| 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(kāi)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(kāi)關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無(wú) 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(kāi)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(kāi)關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無(wú) 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(kāi)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(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(kāi)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(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 |
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