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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 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

output current at +5.0V (

鹵

5%). The LM2686 operates at a

130 kHz switching frequency to reduce output resistance

and voltage ripple. With an operating current of only 450碌A(chǔ)

(operating efficiency greater than 80% with most loads) and

6.0碌A(chǔ) typical shutdown current, the LM2686 is ideal for use

in battery powered systems. The device is in a small 14-pin

TSSOP package.

Features

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+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

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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

漏 1999 National Semiconductor Corporation

DS101141

www.national.com

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