
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 A and an operating
efficiency greater than 90% with most loads, the LM2682
provides ideal performance for battery powered systems.
The LM2682 offers a switching frequency of 6 kHz.
Features
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Inverts then doubles input supply voltage
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Small MSOP-8 package (mini SO-8) and SO-8 package
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90
typical output impedance
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94% typical power efficiency at 10 mA
Applications
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LCD contrast biasing
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GaAs power amplifier biasing
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Interface power supplies
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Handheld instrumentation
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Laptop computers and PDAs
Typical Operating Circuit and Pin Configuration
8-Pin MSOP
or 8-Pin SOIC
10099701
10099702
Ordering Information
Order Number
Package
Package Number
Package Marking
Supplied As
LM2682MM
MSOP-8
MUA08A
S11A
Tape and Reel (1000 units/reel)
LM2682MMX
MSOP-8
MUA08A
S11A
Tape and Reel (3500 units/reel)
LM2682M
SO-8
M08A
LM2682M
Rail (95 units/rail)
LM2682MX
SO-8
M08A
LM2682M
Tape and Reel (2500 units/reel)
November 1999
LM2682
Switched
Capacitor
V
oltage
Doubling
Inverter
2004 National Semiconductor Corporation
DS100997
www.national.com