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參數(shù)資料
| 型號： | 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)： | 6/12頁 |
| 文件大?。?/td> | 282K |
| 代理商： | LM2663M |
Connection Diagrams
Pin Description
Pin
Name
Function
Voltage Inverter
Voltage Doubler
1
FC
Frequency control for internal oscillator:
FC = open, f
OSC
= 20 kHz (typ);
FC = V+, f
OSC
= 150 kHz (typ);
FC has no effect when OSC pin is driven
externally.
Shutdown control pin, tie this pin to the ground
in normal operation.
Connect this pin to the positive terminal of
charge-pump capacitor.
Power supply ground input.
Connect this pin to the negative terminal of
charge-pump capacitor.
Negative voltage output.
Low-voltage operation input. Tie LV to GND
when input voltage is less than 3.5V. Above
3.5V, LV can be connected to GND or left
open. When driving OSC with an external clock,
LV must be connected to GND.
Oscillator control input. OSC is connected to an
internal 15 pF capacitor. An external capacitor
can be connected to slow the oscillator. Also,
an external clock can be used to drive OSC.
Power supply positive voltage input.
Same as inverter.
(LM2662)
1
SD
(LM2663)
CAP+
Same as inverter.
2
Same as inverter.
3
4
GND
CAP
Power supply positive voltage input.
Same as inverter.
5
6
OUT
LV
Power supply ground input.
LV must be tied to OUT.
7
OSC
Same as inverter except that OSC cannot be
driven by an external clock.
8
V+
Positive voltage output.
Circuit Description
The LM2662/LM2663 contains four large CMOS switches
which are switched in a sequence to invert the input supply
voltage. Energy transfer and storage are provided by exter-
nal capacitors. Figure 2 illustrates the voltage conversion
scheme. When S
and S
are closed, C
charges to the sup-
ply voltage V+. During this time interval switches S
and S
4
are open. In the second time interval, S
1
and S
are open
and S
and S
are closed, C
is charging C
. After a number
of cycles, the voltage across C
will be pumped to V+. Since
the anode of C
is connected to ground, the output at the
cathode of C
equals (V+) assuming no load on C
, no loss
in the switches, and no ESR in the capacitors. In reality, the
charge transfer efficiency depends on the switching fre-
quency, the on-resistance of the switches, and the ESR of
the capacitors.
8-Lead SO (M)
DS100003-20
DS100003-21
Top View
Order Number LM2662M, LM2663M
See NS Package Number M08A
DS100003-22
FIGURE 2. Voltage Inverting Principle
www.national.com
6
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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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