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AAT3190

Positive/Negative Charge Pump for Voltage Bias

General Description

The AAT3190 charge pump controller provides the

regulated positive and negative voltage biases

required by active matrix thin-film transistor (TFT)

liquid-crystal displays (LCDs), charge-coupled

device (CCD) sensors, and organic light emitting

diodes (OLEDs). Two low-power charge pumps

convert input supply voltages ranging from 2.7V to

5.5V into two independent output voltages.

The dual low-power charge pumps independently

regulate a positive (V

POS

) and negative (V

NEG

) out-

put voltage. These outputs use external diode and

capacitor multiplier stages (as many stages as

required) to regulate output voltages up to 鹵25V.

Built-in soft-start circuitry prevents excessive in-

rush current during start-up. A high switching fre-

quency enables the use of small external capaci-

tors. The device鈥檚 shutdown feature disconnects

the load from V

IN

and reduces quiescent current to

less than 1.0碌A(chǔ).

The AAT3190 is available in an MSOP-8 or

TSOPJW-12 package and is specified over the

-40擄C to +85擄C operating temperature range.

Features

鈥?/div>

ChargePump

鈩?/div>

V

IN

Range: 2.7V to 5.5V

Adjustable 鹵 Dual Charge Pump

Positive Supply Output Up to +25V

Negative Supply Output Down to -25V

Up to 30mA Output Current

1.0MHz Switching Frequency

<1.0碌A(chǔ) Shutdown Current

Internal Power MOSFETs

Internally Controlled Soft Start

Fast Transient Response

Ultra-Thin Solution (No Inductors)

-40擄C to +85擄C Temperature Range

Available in 8-Pin MSOP or 12-Pin TSOPJW

Package

Applications

鈥?/div>

CCD Sensor Voltage Bias

OLEDs

Passive-Matrix Displays

Personal Digital Assistants (PDAs)

TFT Active-Matrix LCDs

Typical Application

INPUT

IN

EN

DRVN

AAT3190

DRVP

FBN

NEGATIVE

OUTPUT

REF

FBP

GND

POSTIVE

OUTPUT

3190.2005.03.1.0

1

型號

版本

描述

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