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PDF LM2682MM Data sheet ( Hoja de datos )

Número de pieza LM2682MM
Descripción Switched Capacitor Voltage Doubling Inverter
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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November 1999
LM2682
Switched Capacitor Voltage Doubling Inverter
General Description
The LM2682 is a CMOS charge-pump voltage inverter ca-
pable of converting positive voltage in the range of +2.0V to
+5.5V to the corresponding doubled negative voltage of
−4.0V to −11.0V respectively. The LM2682 uses three low
cost capacitors to provide 10 mA of output current without
the cost, size, and EMI related to inductor based circuits.
With an operating current of only 150 µA and an operating ef-
ficiency greater than 90% with most loads, the LM2682 pro-
vides ideal performance for battery powered systems. The
LM2682 offers a switching frequency of 6 kHz.
Features
n Inverts then doubles input supply voltage
n Small MSOP-8 package (mini SO-8) and SO-8 package
n 90typical output impedance
n 94% typical power efficiency at 10 mA
Applications
n LCD contrast biasing
n GaAs power amplifier biasing
n Interface power supplies
n Handheld instrumentation
n Laptop computers and PDAs
Typical Operating Circuit and Pin Configuration
8-Pin MSOP
or 8-Pin SOIC
Ordering Information
Order Number
LM2682MM
LM2682MMX
LM2682M
LM2682MX
Package
MSOP-8
MSOP-8
SO-8
SO-8
DS100997-1
DS100997-2
Package Number
MUA08A
MUA08A
M08A
M08A
Package Marking
S11A
S11A
LM2682M
LM2682M
Supplied As
Tape and Reel (1000 units/reel)
Tape and Reel (3500 units/reel)
Rail (95 units/rail)
Tape and Reel (2500 units/reel)
© 1999 National Semiconductor Corporation DS100997
www.national.com

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LM2682MM pdf
Application Information (Continued)
+5V to −5V Regulated Voltage Converter
Another application in which the LM2682 can be used is for
generating a −5V regulated supply from a +5V unregulated
supply. This involves using an op-amp and a reference and
is connected as shown in Figure 2. The LM358 op-amp was
chosen for its low cost and versatility and the LM4040-5.0
reference was chosen for its low bias current requirement.
Of course other combinations may be used at the designer’s
discretion to fit accuracy, efficiency, and cost requirements.
With this configuration the circuit is well regulated and is still
capable of providing nearly 10 mA of output current. With a 9
mA load the circuit can typically maintain 5% regulation on
the output voltage with the input varying anywhere from 4.5V
to the maximum of 5.5V. With less load the results are even
better. Voltage ripple concerns are reduced in this case since
the ripple at the output of the LM2682 is reduced at the out-
put by the PSRR of the op-amp used.
Paralleling Devices
Any number of devices can be paralleled to reduce the out-
put resistance. As shown in Figure 3, each device must have
its own pumping capacitors, C1 and C2, but only one shared
output capacitor is required. The effective output resistance
is the output resistance of one device divided by the number
of devices used in parallel. Paralleling devices also gives the
capability of increasing the maximum output current. The
maximum output current now becomes the maximum output
current for one device multiplied by the number of devices
used in parallel. For example, if you parallel two devices you
can get 20 mA of output current and have half the output re-
sistance of one device supplying 10 mA.
FIGURE 3. Paralleling Devices
DS100997-5
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