LM2686 Datasheet | National Semiconductor

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 50m A of output current at +5.0V ( ± 5%). The LM2686 operates at a 130 k Hz 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 25m A 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 .national. 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 supply input voltage. Power supply ground. Power supply ground. Power supply ground. Chip enable input. This pin is high for normal operation and low for shutdown and VPSW load disconnect. Shutdown input. This pin is low for normal operation and high for shutdown and VPSW load disconnect. Power supply input voltage. No connection. No connection. Regulated +5V output. V05 output connected through a series switch, PSW. Output of doubled input voltage. The positive terminal of doubling charge-pump capacitor, C1. The negative terminal of doubling charge-pump capacitor, C1. Function SD VIN- NC NC V05 VPSW VDBL C1+ C1- - All VIN pins, pin...