LM2686

Regulated Switched Capacitor Voltage Converter

General Description

The LM2686 CMOS charge-pump voltage converter oper-

ates 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

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 +5V regulated output

n Doubles input supply voltage

n TSSOP 14 package

n 80% typical conversion efficiency at 25mA

n Input voltage range of 2.85V to 6.5V

n Independent shutdown control pins

Applications

n Cellular phones

n Pagers

n PDAs

n Handheld Instrumentation

n 3.3V to 5V Voltage Conversion Applications

Typical Application and Connection Diagram

Ordering Information

Order Number

Package Type

NSC Package

Drawing

Supplied As

LM2686MTC

TSSOP-14

MTC14

94 Units, Rail

LM2686MTCX

TSSOP-14

MTC14

2.5k Units, Tape and Reel

DS101141-1

DS101141-2

14-Pin TSSOP

November 1999

© 1999 National Semiconductor Corporation

DS101141

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