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LM2767
Switched Capacitor Voltage Converter
General Description
The LM2767 CMOS charge-pump voltage converter oper-
ates as a voltage doubler for an input voltage in the range of
+1.8V to +5.5V. Two low cost capacitors and a diode are
used in this circuit to provide at least 15 mAof output current.
The LM2767 operates at 11 kHz switching frequency to
avoid audio voice-band interference. With an operating cur-
rent of only 40 μA(operating efficiency greater than 90% with
most loads), the LM2767 provides ideal performance for bat-
tery powered systems. The device is manufactured in a
SOT23-5 package.
Features
n
Doubles Input Supply Voltage
n
SOT23-5 Package
n
20
Typical Output Impedance
n
96% Typical Conversion Efficiency at 15mA
Applications
n
Cellular Phones
n
Pagers
n
PDAs, Organizers
n
Operational Amplifier Power Suppliers
n
Interface Power Suppliers
n
Handheld Instruments
Basic Application Circuit
Ordering Information
Order Number
Package
Number
MA05B
MA05B
Package
Marking
S17B (Note 1)
S17B (Note 1)
Supplied as
LM2767M5
LM2767M5X
Tape and Reel (1000 units/reel)
Tape and Reel (3000 units/reel)
Note 1:
The small physical size of the SOT-23 package does not allow for the full part number marking. Devices will be marked with the designation shown in
the column Package Marking.
Voltage Doubler
DS101274-1
February 2000
L
2000 National Semiconductor Corporation
DS101274
www.national.com