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參數(shù)資料
| 型號： | LTC1144C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Switched-Capacitor Wide Input Range Voltage Converter with Shutdown |
| 中文描述： | 開關(guān)電容寬輸入范圍電壓轉(zhuǎn)換器，帶有關(guān)斷 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 235K |
| 代理商： | LTC1144C |
7
LTC1144
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
S
A
O
PPLICATI
TYPICAL
Negative Voltage Converter
Figure 8 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 output voltage (pin 5) characteristics of the circuit are
those of a nearly ideal voltage source in series with a 56
resistor. The 56
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.
Figure 9. Voltage Doubler
1
2
3
4
8
7
6
5
+
+
+
+
V
2V TO 18V
V
OUT
= 2(V
IN
– 1)
10
μ
F
10
μ
F
V
d
1N4148
V
d
1N4148
1144 F09
LTC1144
Ultra-Precision Voltage Divider
An ultra-precision voltage divider is shown in Figure 10. 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.
At an oscillator frequency of 10kHz and C1 = 10
μ
F, the first
term is:
1
2
1
5 10
/
R
f
C
EQUIV
OSC
=
(
)
×
=
×
=
1
10 10
20
3
6
Notice that the above equation for R
EQUIV
is nota capaci-
tive reactance equation (X
C
= 1/
ω
C) and does not contain
a 2
π
term.
The exact expression for output impedance is extremely
complex, but the dominant effect of the capacitor is clearly
shown in Figure 5. For C1 = C2 = 10
μ
F, the output
impedance goes from 56
at f
OSC
= 10kHz to 250
at
f
OSC
= 1kHz. As the 1/(f
×
C) term becomes large compared
to the switch on-resistance term, the output resistance is
determined by 1/(f
×
C) only.
Voltage Doubling
Figure 9 shows a two-diode capacitive voltage doubler.
With a 15V input, the output is 29.45V with no load and
28.18V with a 10mA load.
Figure 8. Negative Voltage Converter
1
2
3
4
8
7
6
5
+
+
10
μ
F
10
μ
F
V
+
2V TO 18V
V
OUT
= –V
+
T
MIN
≤
T
A
≤
T
MAX
1144 F08
LTC1144
1
2
3
4
8
7
6
5
+
+
C2
10
μ
F
C1
10
μ
F
V
+
4V TO 36V
1144 F10
LTC1144
±0.002%
T
MIN
≤
T
A
≤
T
MAX
I
L
≤
100nA
V+
2
Figure 10. Ultra-Precision Voltage Divider
Battery Splitter
A common need in many systems is to obtain (+) and (–
)
supplies from a single battery or single power supply
system. Where current requirements are small, the circuit
shown in Figure 11 is a simple solution. It provides
symmetrical
±
output voltages, both equal to one half the
input voltage. The output voltages are both referenced to
pin 3 (output common).
1
2
3
4
8
7
6
5
+
+
C2
10
μ
F
C1
10
μ
F
OUTPUT
COMMON
V
B
/2
9V
–V
B
/2
–9V
1144 F11
LTC1144
V
B
18V
+
Figure 11. Battery Splitter
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| LTC1144CN8 | Switched-Capacitor Wide Input Range Voltage Converter with Shutdown |
| LTC1144CS8 | Switched-Capacitor Wide Input Range Voltage Converter with Shutdown |
| LTC1144I | Switched-Capacitor Wide Input Range Voltage Converter with Shutdown |
| LTC1144IS8 | Switched-Capacitor Wide Input Range Voltage Converter with Shutdown |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1144CN8 | 功能描述:IC REG SWITCHED CAP 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 |
| LTC1144CN8#PBF | 功能描述:IC REG SWITCHED CAP 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 |
| LTC1144CN8PBF | 制造商:Linear Technology 功能描述:LTC1144CN8PBF |
| LTC1144CS8 | 功能描述:IC REG SWITCHED CAP 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: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 |
| LTC1144CS8#PBF | 功能描述:IC REG SWITCHED CAP 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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