LM2685 Dual Output Regulated Switched Capacitor Voltage Converter
May 2000
LM2685 Dual Output Regulated Switched Capacitor Voltage Converter
General Description
The LM2685 CMOS charge-pump voltage converter operates 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 −5V.
The LM2685 operates at a 130 kHz switching frequency to reduce 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 idea...