AAT2820
Triple-Output Charge Pump Regulator
™
ChargePump
General Description
Features
The AAT2820 is a member of AnalogicTech's Total
Power Management IC™ (TPMIC™) product fam-
ily. It is a triple output charge pump targeted for
active matrix thin-film transistor (TFT), liquid crys-
tal displays (LCDs), and CCD camera bias for sys-
tems operating with lithium-ion/polymer batteries.
The device generates three regulated output volt-
ages for turn-on gate drive bias (VPOS), turn-off
gate voltage bias (VNEG), and logic voltage.
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VIN Range: 2.7V to 5.5V
5V Regulated Output Voltage
Two Adjustable Regulated Output Voltages:
VPOS and VNEG
— Positive Charge Pump Up to +25V
— Negative Charge Pump Down to -25V
— Optional Power-Up Sequence with
AAT2820-1
Internal Power MOSFETs
<1µA of Shutdown Current
Internally Controlled Soft Start
Fast Transient Response
Ultra-Thin Solution (No Inductors)
16-Pin TDFN44 Package
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The VPOS and VNEG output voltages are independ-
ently regulated. Both outputs use external diode
and capacitor multiplier stages (as many stages as
required) to regulate output voltages up to +25V
and -25V. An additional regulated output voltage is
provided for biasing the display module. Built-in
soft-start circuitry prevents excessive inrush current
during start-up. A high switching frequency enables
the use of very small external capacitors. A low
shutdown feature disconnects the load from VIN and
reduces quiescent current to less than 0.1µA.
Temperature Range: -40°C to +85°C
Applications
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CCD Cameras
The AAT2820 is available in a Pb-free TDFN44-16
package and is specified over the -40°C to +85°C
operating temperature range.
Hand-Held Instruments
Passive-Matrix Displays
Personal Digital Assistants (PDAs)
TFT Active-Matrix LCDs
Typical Application
CFLY
C+
C-
EN
V
IN
IN
Enable
CIN
Enable (Positive and
Negative Output)
EN/PN
OUT
VOUT
DRVN
COUT
AAT2820
FBN
DRVP
VNEG
REF
FBP
VPOS
GND
2820.2006.04.1.4
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