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LM2686 - Regulated Switched Capacitor Voltage Converter

General Description

The LM2686 CMOS charge-pump voltage converter operates as an input voltage doubler and a +5V regulator for an input voltage in the range of +2.85V to +6.5V.

Three low cost capacitors are used in this circuit to provide up to 50mA of output current at +5.0V ( ± 5%).

Key Features

  • n n n n n n +5V regulated output Doubles input supply voltage TSSOP 14 package 80% typical conversion efficiency at 25mA Input voltage range of 2.85V to 6.5V Independent shutdown control pins.

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LM2686 Regulated Switched Capacitor Voltage Converter November 1999 LM2686 Regulated Switched Capacitor Voltage Converter General Description The LM2686 CMOS charge-pump voltage converter operates as an input voltage doubler and a +5V regulator for an input voltage in the range of +2.85V to +6.5V. Three low cost capacitors are used in this circuit to provide up to 50mA of output current at +5.0V ( ± 5%). The LM2686 operates at a 130 kHz switching frequency to reduce output resistance and voltage ripple. With an operating current of only 450µA (operating efficiency greater than 80% with most loads) and 6.0µA typical shutdown current, the LM2686 is ideal for use in battery powered systems. The device is in a small 14-pin TSSOP package.