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| LM2685 Datasheet, PDF (1/9 Pages) National Semiconductor (TI) – Dual Output Regulated Switched Capacitor Voltage Converter | |||
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May 2000
LM2685
Dual Output Regulated Switched Capacitor Voltage
Converter
General Description
The LM2685 CMOS charge-pump voltage converter oper-
ates as an input voltage doubler, +5V regulator and inverter
for an input voltage in the range of +2.85V to +6.5V. Five low
cost capacitors are used in this circuit to provide up to 50mA
of output current at +5V (± 5%), and 15mA at â5V. The
LM2685 operates at a 130 kHz switching frequency to re-
duce output resistance and voltage ripple. With an operating
current of only 800µA (operating efficiency greater than 80%
with most loads) and 6µA typical shutdown current, the
LM2685 is ideal for use in battery powered systems. The de-
vice is in a small 14-pin TSSOP package.
Features
n +5V regulated output
n Inverts V05(+5V) to VNEG(â5V)
n Doubles input supply voltage
n TSSOP-14 package
n 80% typical conversion efficiency at 25mA
n Input voltage range of 2.85V to 6.5V
n Independent shutdown control pins
Applications
n Cellular phones
n Pagers
n PDAs
n Handheld instrumentation
n 3.3V to 5V voltage conversion applications
Typical Application and Connection Diagram
Ordering Information
Order Number
LM2685MTC
LM2685MTCX
Package Type
TSSOP-14
TSSOP-14
DS101100-1
NSC Package
Drawing
MTC14
MTC14
DS101100-2
14-Pin TSSOP
Supplied As
94 Units, Rail
2.5k Units, Tape and Reel
© 2000 National Semiconductor Corporation DS101100
www.national.com
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