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參數(shù)資料
| 型號： | LM2664MDC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 80 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 340K |
| 代理商： | LM2664MDC |
Connection Diagram
Ordering Information
Order Number
Package
Number
Package
Marking
Supplied as
LM2664M6
MA06A
SO3A (Note 9)
Tape and Reel (1000 units/rail)
LM2664M6X
MA06A
SO3A (Note 9)
Tape and Reel (3000 units/rail)
Note 9: The first letter
″S″ identifies the part as a switched capacitor converter. The next two numbers are the device number. The fourth letter ″A″ indicates the
grade. Only one grade is available. Larger quantity reels are available upon request.
Pin Description
Pin
Name
Function
1
GND
Power supply ground input.
2
OUT
Negative voltage output.
3
CAP
Connect this pin to the negative terminal of the charge-pump capacitor.
4SD
Shutdown control pin, tie this pin to V+ in normal operation, and to GND for shutdown.
5
V+
Power supply positive voltage input.
6
CAP+
Connect this pin to the positive terminal of the charge-pump capacitor.
Circuit Description
The LM2664 contains four large CMOS switches which are
switched in a sequence to invert the input supply voltage.
Energy transfer and storage are provided by external capaci-
tors.
Figure 2 illustrates the voltage conversion scheme.
When S
1 and S3 are closed, C1 charges to the supply volt-
age V+. During this time interval, switches S
2 and S4 are
open. In the second time interval, S
1 and S3 are open; at the
same time, S
2 and S4 are closed, C1 is charging C2. After a
number of cycles, the voltage across C
2 will be pumped to
V+. Since the anode of C
2 is connected to ground, the output
at the cathode of C
2 equals (V+) when there is no load cur-
rent. The output voltage drop when a load is added is deter-
mined by the parasitic resistance (R
ds(on) of the MOSFET
switches and the ESR of the capacitors) and the charge
transfer loss between capacitors. Details will be discussed in
the following application information section.
Application Information
Simple Negative Voltage Converter
The main application of LM2664 is to generate a negative
supply voltage. The voltage inverter circuit uses only two ex-
ternal capacitors as shown in the Basic Application Circuits.
The range of the input supply voltage is 1.8V to 5.5V.
The output characteristics of this circuit can be approximated
by an ideal voltage source in series with a resistance. The
voltage source equals (V+). The output resistance R
out is a
function of the ON resistance of the internal MOSFET
switches, the oscillator frequency, the capacitance and ESR
of C
1 and C2. Since the switching current charging and dis-
charging C
1 is approximately twice as the output current, the
6-Lead Small Outline Package (M6)
DS100031-4
Top View With Package Marking
DS100031-22
Actual Size
DS100031-5
FIGURE 2. Voltage Inverting Principle
LM2664
www.national.com
5
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LM2665 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LM2665M6 | 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 |
| LM2665M6/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 |
| LM2665M6/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter (DC-DC) IC |
| LM2665M6X | 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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