- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄358829 > LM2767M5X (NATIONAL SEMICONDUCTOR CORP) Switched Capacitor Voltage Converter PDF資料下載
參數(shù)資料
| 型號(hào)： | LM2767M5X |
| 廠(chǎng)商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Switched Capacitor Voltage Converter |
| 中文描述： | 0.03 A SWITCHED CAPACITOR CONVERTER, 25 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 7/9頁(yè) |
| 文件大小： | 194K |
| 代理商： | LM2767M5X |
Other Applications
Paralleling Devices
Any number of LM2767s can be paralleled to reduce the out-
put resistance. Since there is no closed loop feedback, as
found in regulated circuits, stable operation is assured. Each
device must have its own pumping capacitor C
, while only
one output capacitor C
is needed as shown in Figure 3.
The composite output resistance is:
Cascading Devices
Cascading the LM2767s is an easy way to produce a greater
voltage (A two-stage cascade circuit is shown in Figure 4).
The effective output resistance is equal to the weighted sum
of each individual device:
R
out
= 1.5R
out_1
+ R
out_2
Note that increasing the number of cascading stages is prac-
itically limited since it significantly reduces the efficiency, in-
creases the output resistance and output voltage ripple.
Regulating V
OUT
It is possible to regulate the output of the LM2767 by use of
a low dropout regulator (such as LP2980-5.0). The whole
converter is depicted in Figure 5.
A different output voltage is possible by use of LP2980-3.3,
LP2980-3.0, or LP2980-adj.
Note that the following conditions must be satisfied simulta-
neously for worst case design:
2V
in_min
>
V
out_min
+V
drop_max
(LP2980) + I
out_max
x R
out_max
(LM2767)
2V
in_max
<
V
out_max
+V
drop_min
(LP2980) + I
out_min
x R
out_min
(LM2767)
DS101274-19
FIGURE 3. Lowering Output Resistance by Paralleling Devices
DS101274-20
FIGURE 4. Increasing Output Voltage by Cascading Devices
L
www.national.com
7
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM2767 | Switched Capacitor Voltage Converter |
| LM2770SD-1215 | 16 Characters x 2 Lines, 5x7 Dot Matrix Character and Cursor |
| LM2770SD-12157 | 16 Characters x 2 Lines, 5x7 Dot Matrix Character and Cursor |
| LM2770SDX-1215 | High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode |
| LM2770SDX-12157 | High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2767M5X/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 |
| LM2770 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode |
| LM2770A-AABZ WAF | 制造商:Texas Instruments 功能描述: |
| LM2770SD-1215 | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| LM2770SD-1215/NOPB | 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。