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 ±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 V
IN
and reduces quiescent current to
less than 1.0µA.
The AAT3190 is available in a Pb-free MSOP-8 or
TSOPJW-12 package and is specified over the
-40°C to +85°C operating temperature range.
Features
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ChargePump
™
V
IN
Range: 2.7V to 5.5V
Adjustable ± Dual Charge Pump
Positive Supply Output Up to +25V
Negative Supply Output Down to -25V
Up to 30mA Output Current
1.0MHz Switching Frequency
<1.0µA 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 or 12-Pin TSOPJW
Package
Applications
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CCD Sensor Voltage Bias
OLEDs
Passive-Matrix Displays
Personal Digital Assistants (PDAs)
TFT Active-Matrix LCDs
Typical Application
INPUT
IN
EN
EN
DRVN
AAT3190
DRVP
NEGATIVE
OUTPUT
FBN
REF
FBP
GND
POSTIVE
OUTPUT
3190.2006.01.1.2
1
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
