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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 oper-

ates 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 (

鹵

5%), and 15mA at 鈭?V. The

LM2685 operates at a 130 kHz switching frequency to re-

duce output resistance and voltage ripple. With an operating

current of only 800碌A (operating efficiency greater than 80%

with most loads) and 6碌A typical shutdown current, the

LM2685 is ideal for use in battery powered systems. The de-

vice is in a small 14-pin TSSOP package.

Features

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+5V regulated output

Inverts V

05

(+5V) to V

NEG

(鈭?V)

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

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

漏 2000 National Semiconductor Corporation

DS101100

www.national.com

next

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