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PDF LM2665M6 Data sheet ( Hoja de datos )
| Número de pieza | LM2665M6 | |
| Descripción | Switched Capacitor Voltage Converter | |
| Fabricantes | National Semiconductor | |
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November 1999
LM2665
Switched Capacitor Voltage Converter
General Description
The LM2665 CMOS charge-pump voltage converter oper-
ates as a voltage doubler for an input voltage in the range of
+2.5V to +5.5V. Two low cost capacitors and a diode
(needed during start-up) are used in this circuit to provide up
to 40 mA of output current. The LM2665 can also work as a
voltage divider to split a voltage in the range of +1.8V to
+11V in half.
The LM2665 operates at 160 kHz oscillator frequency to re-
duce output resistance and voltage ripple. With an operating
current of only 650 µA (operating efficiency greater than 90%
with most loads) and 1µA typical shutdown current, the
LM2665 provides ideal performance for battery powered
systems. The device is in SOT-23-6 package.
Features
n Doubles or Splits Input Supply Voltage
n SOT23-6 Package
n 12Ω Typical Output Impedance
n 90% Typical Conversion Efficiency at 40 mA
n 1µA Typical Shutdown Current
Applications
n Cellular Phones
n Pagers
n PDAs
n Operational Amplifier Power Suppliers
n Interface Power Suppliers
n Handheld Instruments
Basic Application Circuits
Voltage Doubler
Splitting Vin in Half
DS100049-1
DS100049-2
© 1999 National Semiconductor Corporation DS100049
www.national.com
1 page  
Connection Diagram
6-Lead SOT (M6)
DS100049-22
Actual Size
DS100049-13
Top View With Package Marking
Ordering Information
Order Number
LM2665M6
LM2665M6X
Package
Number
MA06A
MA06A
Package
Marking
SO4A (Note 9)
SO4A (Note 9)
Supplied as
Tape and Reel (1000 units/rail)
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
1 V+
2 GND
3 CAP−
4 SD
5 OUT
6 CAP+
Function
Voltage Doubler
Power supply positive voltage input.
Power supply ground input
Connect this pin to the negative terminal of the
charge-pump capacitor
Shutdown control pin, tie this pin to ground in normal
operation.
Positive voltage output.
Connect this pin to the positive terminal of the
charge-pump capacitor.
Voltage Split
Positive voltage output.
Same as doubler
Same as doubler.
Same as doubler.
Power supply positive voltage
input
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 S2 and S4 are closed, C1 charges to the supply volt-
age V+. During this time interval, switches S1 and S3 are
open. In the next time interval, S2 and S4 are open; at the
same time, S1 and S3 are closed, the sum of the input volt-
age V+ and the voltage across C1 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 (Rd-
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.
FIGURE 2. Voltage Doubling Principle
DS100049-14
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
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| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LM2665M6.PDF ] | |
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