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參數(shù)資料
| 型號： | LTC1046 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 5V to -5V Monolithic CMOS Switched Voltage Converter(5V 到 -5V單片CMOS開關(guān)電容電壓轉(zhuǎn)換器) |
| 中文描述： | 5V至- 5V的單片CMOS開關(guān)電壓轉(zhuǎn)換器（5V的到- 5V的單片的CMOS開關(guān)電容電壓轉(zhuǎn)換器） |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 176K |
| 代理商： | LTC1046 |
7
LTC1046
U
S
A
O
PPLICATI
TYPICAL
Negative Voltage Converter
Figure 7. Negative Voltage Converter
Figure 7 shows a typical connection which will provide a
negative supply from an available positive supply. This
circuit operates over full temperature and power supply
ranges without the need of any external diodes. The LV pin
(Pin 6) is shown grounded, but for V
+
≥
3V, it may be
floated, since LV is internally switched to GND (Pin 3) for
V
+
≥
3V.
The output voltage (Pin 5) characteristics of the circuit are
those of a nearly ideal voltage source in series with an 27
resistor. The 27
output impedance is composed of two
terms: 1) the equivalent switched capacitor resistance
(see Theory of Operation), and 2) a term related to the ON
resistance of the MOS switches.
At an oscillator frequency of 30kHz and C1 = 10
μ
F, the first
term is:
R
=
1
/2
f
EQUIV
OSC
1
10 10
(
)
=
=
.
–
C1
15 10
6 7
3
6
.
Notice that the equation for R
EQUIV
is not a capacitive
reactance equation (X
C
= 1/
ω
C) and does not contain a 2
π
term.
The exact expression for output impedance is complex,
but the dominant effect of the capacitor is clearly shown on
Figure 8. Voltage Doubler
Figure 9. Ultraprecision Voltage Divider
the typical curves of output impedance and power effi-
ciency versus frequency. For C1 = C2 = 10
μ
F, the output
impedance goes from 27
at f
OSC
= 30kHz to 225
at
f
OSC
= 1kHz. As the 1/fC term becomes large compared to
switch ON resistance term, the output resistance is deter-
mined by 1/fC only.
Voltage Doubling
Figure 8 shows a two diode, capacitive voltage doubler.
With a 5V input, the output is 9.1V with no load and 8.2V
with a 10mA load.
1
2
3
4
8
7
6
5
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
LTC1046
10
μ
F
10
μ
F
1046 F07
V
+
1.5V TO 6V
V
OUT
= –V
+
REQUIRED FOR V
+
< 3V
T
MIN
≤
T
A
≤
T
MAX
+
+
1
2
3
4
8
7
6
5
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
LTC1046
10
μ
F
10
μ
F
V
D
V
D
+
+
1046 F08
V
+
1.5V TO 6V
V
OUT
= 2
(V
IN
– 1)
REQUIRED
FOR
V
+
< 3V
+
+
Ultraprecision Voltage Divider
An ultraprecision voltage divider is shown in Figure 9. To
achieve the 0.0002% accuracy indicated, the load current
should be kept below 100nA. However, with a slight loss
in accuracy, the load current can be increased.
1
2
3
4
8
7
6
5
V
+
OSC
LV
V
OUT
BOOST
CAP
+
GND
CAP
–
LTC1046
C1
10
μ
F
C2
10
μ
F
T
MIN
≤
T
A
≤
T
MAX
I
L
≤
100nA
REQUIRED FOR V
+
< 6V
1046 F09
V
+
3V TO 12V
+
+
±
0.002%
V
+
2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1046C | 制造商:LINER 制造商全稱:Linear Technology 功能描述:“Inductorless” 5V to + 5V Converter |
| LTC1046CN8 | 功能描述:IC REG SWITCHED CAP DIV INV 8DIP 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 |
| LTC1046CN8#PBF | 功能描述:IC REG SWITCHED CAP DIV INV 8DIP 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 |
| LTC1046CS8 | 功能描述:IC REG SWITCHD CAP DIV INV 8SOIC 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: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 |
| LTC1046CS8#PBF | 功能描述:IC REG SWITCHD CAP DIV INV 8SOIC 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 |
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