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參數(shù)資料
| 型號： | ICL7660 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Switched-Capacitor Voltage Converters(非穩(wěn)壓型，輸出電流10mA，輸出電壓-VIN，+2VIN，電荷泵電壓變換器) |
| 中文描述： | 開關(guān)電容電壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 157K |
| 代理商： | ICL7660 |
M
current is: I = f x
Q = f x C1(V+ - V
). Rewriting this
equation in Ohm’s law form defines an equivalent resis-
tance synthesized by the switched-capacitor circuit
where:
(V+ - V
1 / (f x C1)
and
where f is one-half the oscillator frequency. This resis-
tance is a major component of the output impedance of
switched-capacitor circuits like the MAX1044/ICL7660.
As shown in Figure 4, the MAX1044/ICL7660 contain
MOSFET switches, the necessary transistor drive cir-
cuitry, and a timing oscillator.
________________Design Information
The MAX1044/ICL7660 are designed to provide a
simple, compact, low-cost solution where negative or
doubled supply voltages are needed for a few low-
power components. Figure 5 shows the basic negative
voltage converter circuit. For many applications, only
two external capacitors are needed. The type of
capacitor used is not critical.
Proper Use of the Low-V oltage (LV ) Pin
Figure 4 shows an internal voltage regulator inside the
MAX1044/ICL7660. Use the LV pin to bypass this
regulator, in order to improve low-voltage performance
I
)
R
1
f x C1
OUT
EQUIV
=
=
S witc hed-Capac itor Voltage Converters
6
_______________________________________________________________________________________
S1
V+
S2
S3
S4
C1
C2
V
OUT
= -(V+)
Figure 2. Ideal Voltage Inverter
V+
C1
f
C2
R
LOAD
V
OUT
Figure 3a. Switched Capacitor Model
R
EQUIV
=
R
EQUIV
V
OUT
R
LOAD
1
V+
f
×
C1
C2
Figure 3b. Equivalent Circuit
1M
BOOST
pin 1
OSC
pin 7
LV
pin 6
GND
pin 3
CAP-
pin 4
S2
S1
S4
S3
CAP+
pin 2
V+
pin 8
V
pin 5
÷ 2
Q
O
I
R
Q
Figure 4. MAX1044 and ICL7660 Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL7660 DIE | 制造商:Harris Corporation 功能描述: |
| ICL7660ACBA | 功能描述:電荷泵 CMOS VAGE CNVRTR COM RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| ICL7660ACBA-T | 功能描述:電荷泵 CMOS VAGE CNVRTR COM TAPE RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| ICL7660ACBAZ | 制造商:Intersil 功能描述:Bulk |
| ICL7660ACBAZA | 功能描述:電荷泵 W/ANNEAL CMOS VOLT CONVRTR 8 COM RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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