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AAT3190
(Rev.:2004)

Positive/Negative Charge Pump for Voltage Bias

Analog Technology Inc 

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), CCD Sensors and

OLEDs. Two low-power charge pumps convert

input supply voltages ranging from 2.7-5.5V into two

independent output voltages.

The dual low-power charge pumps independently

regulate a positive (VPOS) and a negative (VNEG)

output voltage. These outputs use external diode

and capacitor multiplier stages (as many stages as

required) to regulate output voltages up to ±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’s shutdown feature disconnects

the load from VIN and reduces the quiescent cur-

rent to less than 1.0 µA.

The AAT3190 is available in MSOP 8 or TSOPJW-

12 packages and is specified over a -40°C to 85°C

operating temperature range

Typical Application

Features

ChargePump™

• VIN Range: 2.7-5.5 Volts

• Adjustable ± dual charge pump

• Positive supply output up to +25V

• Negative supply output down to -25V

• Up to 30mA output current

• 1.0 MHz Switching Frequency

• < 1.0µA Shutdown Current

• Internal power MOSFETs

• Internally controlled Soft-Start

• Fast Transient Response

• Ultra-Thin Solution (No Inductors)

• -40°C to 85°C Temperature Range

• Available in 8-Pin MSOP, 12-pin TSOPJW

Applications

• TFT Active-Matrix LCDs

• Passive-Matrix Displays

• Personal Digital Assistants (PDAs)

• CCD Sensor Voltage Bias

• Organic LEDs (OLED)

INPUT

EN

NEGATIVE

OUTPUT

IN

EN

DRVN

AAT3190

FBN

DRVP

REF

FBP

GND

POSTIVE

OUTPUT

3190.2004.05.0.91

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