LM2685

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 ideal for use in battery powered systems. The device is in a small 14-pin TSSOP package. Features n n n n n n n +5V regulated output Inverts V05(+5V) to VNEG(−5V) 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 DS101100-2 14-Pin TSSOP DS101100-1 Ordering Information Order Number LM2685MTC LM2685MTCX Package Type TSSOP-14 TSSOP-14 NSC Package Drawing MTC14 MTC14 Supplied As 94 Units, Rail 2.5k Units, Tape and Reel © 2000 National Semiconductor Corporation DS101100 www.national.com LM2685 Pin Description Pin No. 1 2...