 2002 Microchip Technology Inc.

DS21548B-page 1

Features

• Small 8-Pin MSOP Package

• Operates from 1.8V to 5.5V

• 120 Ohms (typ) Output Resistance

• 99% Voltage Conversion Efficiency

• Only 3 External Capacitors Required

• Power-Saving Shutdown Mode

• Low Active Supply Current

-95

µA (typ) for TC2682

- 225

µA (typ) for TC2683

- 700

µA (typ) for TC2684

Applications

• LCD Panel Bias

• Cellular Phones PA Bias

• Pagers

• PDAs, Portable Data Loggers

• Battery-Powered Devices

Device Selection Table

Package Type

General Description

The TC2682/TC2683/TC2684 are CMOS charge pump

converters that provide an inverted doubled output

from a single positive supply. An on-board oscillator

provides the clock and only three external capacitors

are required for full circuit implementation. Switching

frequencies are 12kHz for the TC2682, 35kHz for the

TC2683, and 125kHz for the TC2684.

Low output source impedance (typically 120

Ω),

provides output current up to 10mA. The TC2682/

TC2683/TC2684 feature a 1.8V to 5.5V operating

voltage range and high efficiency, which make them an

ideal choice for a wide variety of applications requiring

a negative doubled voltage derived from a single

positive supply (for example: generation of -7.2V from

a +3.6V lithium cell or -10V generated from a +5V logic

supply).

The minimum external part count and small physical

size make this family of products useful for a wide

variety of negative bias power supply applications.

Functional Block Diagram

Part

Number

Package

Osc.

Freq.

(kHz)

Operating

Temp.

Range

TC2682EUA

8-Pin MSOP

12

-40°C to +85°C

TC2683EUA

8-Pin MSOP

35

-40°C to +85°C

TC2684EUA

8-Pin MSOP

125

-40°C to +85°C

1

2

3

4

8

7

6

5

TC2682

TC2683

TC2684

NC

C2–

GND

C1–

C1+

C2+

8-Pin MSOP

C1+

C2+

C1–

C2

C2–

C1

TC2682

TC2683

TC2684

+

+

+

– C

OUT

Input

GND

C1 must have a voltage rating

≥ VIN

Inverting Charge Pump Voltage Doublers