LM2686

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. 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 Applications n n n n n Cellular phones Pagers PDAs Handheld Instrumentation 3.3V to 5V Voltage Conversion Applications Typical Application and Connection Diagram DS101141-2 DS101141-1 14-Pin TSSOP Ordering Information Order Number LM2686MTC LM2686MTCX Package Type TSSOP-14 TSSOP-14 NSC Package Drawing MTC14 MTC14 Supplied As 94 Units, Rail 2.5k Units, Tape and Reel © 1999 National Semiconductor Corporation DS101141 www.national.com LM2686 Pin Description Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Name VIN* GND** GND** GND** CE Power suppl...