© 2006 Microchip Technology Inc.

DS21453C-page 1

TC682

Features:

• 99.9% Voltage Conversion Efficiency

• 92% Power Conversion Efficiency

• Wide Input Voltage Range:

- +2.4V to +5.5V

• Only 3 External Capacitors Required

• 185

μA Supply Current

• Space-Saving 8-Pin SOIC and 8-Pin PDIP

Packages

Applications:

• -10V from +5V Logic Supply

• -6V from a Single 3V Lithium Cell

• Portable Handheld Instruments

• Cellular Phones

• LCD Display Bias Generator

• Panel Meters

• Operational Amplifier Power Supplies

Device Selection Table

General Description:

The TC682 is a CMOS charge pump converter that

provides an inverted doubled output from a single

positive supply. An on-board 12 kHz (typical) oscillator

provides the clock and only 3 external capacitors are

required for full circuit implementation.

Low output source impedance (typically

140

Ω),

provides output current up to 10 mA. The TC682 fea-

tures low quiescent current and high efficiency, making

it the ideal choice for a wide variety of applications that

require a negative voltage derived from a single

positive supply (for example: generation of -6V from a

3V lithium cell or -10V generated from a +5V logic

supply).

The minimum external parts count and small physical

size of the TC682 make it useful in many medium-

current, dual voltage analog power supplies.

Functional Block Diagram

Package Type

Part

Number

Package

Operating

Temp.

Range

TC682COA

8-Pin SOIC

0°C to +70°C

TC682CPA

8-Pin PDIP

0°C to +70°C

TC682EOA

8-Pin SOIC

-40°C to +85°C

TC682EPA

8-Pin PDIP

-40°C to +85°C

GND

+

–

+

–

+

GND

All Caps = 3.3

μF

TC682

1

2

3

4

8

7

6

5

TC682CPA

TC682EPA

NC

GND

1

2

3

4

8

7

6

5

TC682COA

TC682EOA

8-Pin PDIP

8-Pin SOIC

NC

GND

Inverting Voltage Doubler