LM2682 Datasheet, PDF (1/7 Pages) National Semiconductor (TI) – Switched Capacitor Voltage Doubling Inverter

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 90Ω typical 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