LMC7660 Switched Capacitor Voltage Converter
April 1997
LMC7660
Switched Capacitor Voltage Converter
General Description
The LMC7660 is a CMOS voltage converter capable of con-
verting a positive voltage in the range of +1.5V to +10V to
the corresponding negative voltage of −1.5V to −10V. The
LMC7660 is a pin-for-pin replacement for the
industry-standard 7660. The converter features: operation
over full temperature and voltage range without need for an
external diode, low quiescent current, and high power effi-
ciency.
The LMC7660 uses its built-in oscillator to switch 4 power
MOS switches and charge two inexpensive electrolytic ca-
pacitors.
Features
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Operation over full temperature and voltage range
without an external diode
n
Low supply current, 200 µA max
n
Pin-for-pin replacement for the 7660
n
Wide operating range 1.5V to 10V
n
97% Voltage Conversion Efficiency
n
95% Power Conversion Efficiency
n
Easy to use, only 2 external components
n
Extended temperature range
n
Narrow SO-8 Package
Block Diagram
DS009136-1
Pin Configuration
DS009136-2
Ordering Information
Package
Temperature Range
Industrial
−40˚C to +85˚C
8-Lead Molded DIP
8-Lead Molded Small Outline
LMC7660IN
LMC7660IM
N08E
M08A
NSC
Drawing
© 1997 National Semiconductor Corporation
DS009136
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
