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參數資料
| 型號： | LMC7660 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Switched Capacitor Voltage Converter |
| 中文描述： | 開關電容電壓轉換器 |
| 文件頁數： | 6/12頁 |
| 文件大小： | 134K |
| 代理商： | LMC7660 |
Typical Applications
(Continued)
Increasing Output Voltage
Stacking the LMC7660s is an easy way to produce a greater
negative voltage. It should be noted that the input current re-
quired for each stage is twice the load current on that stage
as shown in Figure 6 The effective output resistance is ap-
proximately the sum of the individual R
values, and so
only a few levels of multiplication can be used.
It is possible to generate 15V from +5V by connecting the
second 7660’s pin 8 to +5V instead of ground as shown in
Figure 7 Note that the second 7660 sees a full 20V and the
input supply should not be increased beyond +5V.
Split V
+
In Half
Figure 8 is one of the more interesting applications for the
LMC7660. The circuit can be used as a precision voltage di-
vider (for very light loads), alternately it is used to generate a
1
2
supply point in battery applications. In the
1
2
cycle when
S1 and S3 are closed, the supply voltage divides across the
capacitors in a conventional way proportional to their value.
In the
1
2
cycle when S2 and S4 are closed, the capacitors
switch from a series connection to a parallel connection. This
forces the capacitors to have the same voltage; the charge
redistributes to maintain precisely V
+
/2, across C
and C
. In
this application all devices are only V
+
/2, and the supply volt-
age can be raised to 20V giving exactly 10V at V
out
.
DS009136-9
FIGURE 5. Lowering Output Resistance by Paralleling Devices
DS009136-10
FIGURE 6. Higher Voltage by Cascade
DS009136-11
FIGURE 7. Getting 15V from +5V
www.national.com
6
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMC7660IM | 功能描述:電荷泵 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 |
| LMC7660IM/NOPB | 功能描述:電荷泵 Switched Cap Vltg Converter 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 |
| LMC7660IM/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter (DC-DC) IC |
| LMC7660IMX | 功能描述:電荷泵 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 |
| LMC7660IMX/NOPB | 功能描述:電荷泵 SWITCHED CAPACITOR VOLTAGE CONVERTER 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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