TC2682(2002) Ver la hoja de datos (PDF) - Microchip Technology

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componentes Descripción

Fabricante

TC2682
(Rev.:2002)

Inverting Charge Pump Voltage Doublers

Microchip Technology 

M TC2682/TC2683/TC2684

Inverting Charge Pump Voltage Doublers

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

- 95µA (typ) for TC2682

- 225µA (typ) for TC2683

- 700µA (typ) for TC2684

Applications

• LCD Panel Bias

• Cellular Phones PA Bias

• Pagers

• PDAs, Portable Data Loggers

• Battery-Powered Devices

Device Selection Table

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

Package Type

8-Pin MSOP

C1– 1

C2+ 2

C2– 3

VOUT 4

TC2682

TC2683

TC2684

8 NC

7 C1+

6 VIN

5 GND

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 120Ω),

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

+

C1+

C1

C1–

VIN

Input

C2+ TC2682

+

TC2683

C2

C2– TC2684

GND

VOUT

VOUT = -(2 x VIN)

– COUT

+

C1 must have a voltage rating ≥ VIN

C2 and COUT must have a voltage rating ≥ 2VIN

 2002 Microchip Technology Inc.

DS21548B-page 1

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