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LM2665 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2665
Description  Switched Capacitor Voltage Converter
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM2665 Datasheet(HTML) 5 Page - National Semiconductor (TI)

   
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Connection Diagram
Ordering Information
Order Number
Package
Number
Package
Marking
Supplied as
LM2665M6
MA06A
SO4A (Note 9)
Tape and Reel (1000 units/rail)
LM2665M6X
MA06A
SO4A (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
Voltage Doubler
Voltage Split
1
V+
Power supply positive voltage input.
Positive voltage output.
2
GND
Power supply ground input
Same as doubler
3
CAP−
Connect this pin to the negative terminal of the
charge-pump capacitor
Same as doubler.
4
SD
Shutdown control pin, tie this pin to ground in normal
operation.
Same as doubler.
5
OUT
Positive voltage output.
Power supply positive voltage
input
6
CAP+
Connect this pin to the positive terminal of the
charge-pump capacitor.
Same as doubler
Circuit Description
The LM2665 contains four large CMOS switches which are
switched in a sequence to double the input supply voltage.
Energy transfer and storage are provided by external capaci-
tors. Figure 2 illustrates the voltage conversion scheme.
When S
2 and S4 are closed, C1 charges to the supply volt-
age V+. During this time interval, switches S
1 and S3 are
open. In the next time interval, S
2 and S4 are open; at the
same time, S
1 and S3 are closed, the sum of the input volt-
age V+ and the voltage across C
1 gives the 2V+ output volt-
age when there is no load. The output voltage drop when a
load is added is determined by the parasitic resistance (R
d-
s(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
Positive Voltage Doubler
The main application of the LM2665 is to double the input
voltage. The range of the input supply voltage is 2.5V to
5.5V.
The output characteristics of this circuit can be approximated
by an ideal voltage source in series with a resistance. The
6-Lead SOT (M6)
DS100049-13
Top View With Package Marking
DS100049-22
Actual Size
DS100049-14
FIGURE 2. Voltage Doubling Principle
www.national.com
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