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參數(shù)資料
| 型號(hào)： | LM2663M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switched Capacitor Voltage Converter |
| 中文描述： | SWITCHED CAPACITOR CONVERTER, 150 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 282K |
| 代理商： | LM2663M |
Application Information
(Continued)
CAPACITOR SELECTION
As discussed in the Simple Negative Voltage Converter section, the output resistance and ripple voltage are dependent on the
capacitance and ESR values of the external capacitors. The output voltage drop is the load current times the output resistance,
and the power efficiency is
Where I
(V+) is the quiescent power loss of the IC device, and I
L2
R
OUT
is the conversion loss associated with the switch on-
resistance, the two external capacitors and their ESRs.
Low ESR capacitors (Table 3) are recommended for both capacitors to maximize efficiency, reduce the output voltage drop and
voltage ripple. For convenience, C
1
and C
2
are usually chosen to be the same.
The output resistance varies with the oscillator frequency and the capacitors. In Figure 3 the output resistance vs. oscillator fre-
quency curves are drawn for four difference capacitor values. At very low frequency range, capacitance plays the most important
role in determining the output resistance. Once the frequency is increased to some point (such as 100 kHz for the 47 μF capaci-
tors), the output resistance is dominated by the ON resistance of the internal switches and the ESRs of the external capacitors.
A low value, smaller size capacitor usually has a higher ESR compared with a bigger size capacitor of the same type. Ceramic
capacitors can be chosen for their lower ESR. As shown in Figure 3 in higher frequency range, the output resistance using the
10 μF ceramic capacitors is close to these using higher value tantalum capacitors.
TABLE 3. Low ESR Capacitor Manufacturers
Manufacturer
Nichicon Corp.
AVX Corp.
Sprague
Sanyo
Murata
Taiyo Yuden
Tokin
Phone
Capacitor Type
(708)-843-7500
(803)-448-9411
(207)-324-4140
(619)-661-6835
(800)-831-9172
(800)-348-2496
(408)-432-8020
PL, PF series, through-hole aluminum electrolytic
TPS series, surface-mount tantalum
593D, 594D, 595D series, surface-mount tantalum
OS-CON series, through-hole aluminum electrolytic
Ceramic chip capacitors
Ceramic chip capacitors
Ceramic chip capacitors
DS100003-36
FIGURE 3. Output Source Resistance vs Oscillator Frequency
www.national.com
8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LM2664 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Switched Capacitor Voltage Converter |
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