SP682 データシートの表示（PDF） - Signal Processing Technologies

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SP682

Micro Power Inverting Charge Pump

Signal Processing Technologies 

Corporation

SP682

Micro Power Inverting Charge Pump

■ Low Power Voltage Conversion

■ +2.4V to +5.5V Input Range

■ 99% Voltage Conversion Efficiency

■ Typical 60µA Supply Current

■ Requires Only Three External Capacitors

■ Includes Low Power Shutdown Option

■ Ideal in Portable Applications Such As

Handheld Instruments

Cellular Phones

Personal Digital Assistants

Laptops and Notebooks

■ Pin Compatible Upgrade to Microchip's

TC682

C1- 1

C2+ 2

C2- 3

VOUT 4

SP682

8 Pin MSOP

8 SD

7 C1+

6 VCC

5 GND

APPLICATIONS

■ LCD Display

■ Negative bias supply for op amps

■ Serial interface protocol circuits

DESCRIPTION

The SP682 is a monolithic charge pump voltage converter that produces a doubled, negative

voltage from a single positive supply. The SP682 charge pump outputs a –10V voltage from

a +5V input. Three external charge pump capacitors are required to support the voltage

conversion and voltage doubling process. An internal oscillator generates a 12kHz clock

which cycles the internal switching that charges the storage and transfer capacitors. The

charge pump architecture is fabricated using a low power BiCMOS process technology.

The SP682 charge pump is ideal for low power applications requiring a typical +3V battery

source such as a lithium cell. Typical applications are handheld instruments, notebook and

laptop computers, cellular phones, and data acquisition or GP systems. The SP682 is

packaged in either 8-pin NSOIC, 8-pin MSOP for surface mount applications, and 8 Pin PDIP.

TYPICAL APPLICATION CIRCUIT

+2.4V to +5V

1µF

+

6

7

VCC

C1+

C1

VOUT 4

1 C1–

2

SP682

C2+

C2

3 C2–

GND

5

SD 8

- VOUT

COUT

Date: 5/20/04

SP682 Micro Power Inverting Charge Pump

1

© Copyright 2004 Sipex Corporation

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