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參數資料
| 型號： | LM2663 |
| 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： | 9/12頁 |
| 文件大小： | 282K |
| 代理商： | LM2663 |
Other Applications
PARALLELING DEVICES
Any number of LM2662s (or LM2663s) can be paralleled to reduce the output resistance. Each device must have its own pumping
capacitor C
1
, while only one output capacitor C
out
is needed as shown in Figure 4 The composite output resistance is:
CASCADING DEVICES
Cascading the LM2662s (or LM2663s) is an easy way to produce a greater negative voltage (as shown in Figure 5). If n is the
integer representing the number of devices cascaded, the unloaded output voltage V
out
is (nV
in
). The effective output resistance
is equal to the weighted sum of each individual device:
A three-stage cascade circuit shown in Figure 6 generates 3V
in
, from V
in
.
Cascading is also possible when devices are operating in doubling mode. In Figure 7 two devices are cascaded to generate 3V
in
.
An example of using the circuit in Figure 6 or Figure 7 is generating +15V or 15V from a +5V input.
Note that, the number of n is practically limited since the increasing of n significantly reduces the efficiency and increases the out-
put resistance and output voltage ripple.
DS100003-24
FIGURE 4. Lowering Output Resistance by Paralleling Devices
DS100003-25
FIGURE 5. Increasing Output Voltage by Cascading Devices
www.national.com
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相關PDF資料 |
PDF描述 |
|---|---|
| LM2663M | Switched Capacitor Voltage Converter |
| LM2670 | SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync |
| LM2670T-3.3 | SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync |
| LM2670T-5.0 | SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync |
| LM2670T-ADJ | SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator with Sync |
相關代理商/技術參數 |
參數描述 |
|---|---|
| LM2663M | 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 |
| LM2663M/NOPB | 功能描述:電荷泵 SWITCHED CAPACITOR 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 |
| LM2663M/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter (DC-DC) IC |
| LM2663MX | 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 |
| LM2663MX/NOPB | 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 |
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