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| AAT2820 Datasheet, PDF (1/18 Pages) Advanced Analogic Technologies – Triple-Output Charge Pump Regulator | |||
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AAT2820
Triple-Output Charge Pump Regulator
General Description
Features
ChargePumpâ¢
The AAT2820 is a member of AnalogicTech's Total
Power Management IC⢠(TPMICâ¢) 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.
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.
The AAT2820 is available in a Pb-free TDFN44-16
package and is specified over the -40°C to +85°C
operating temperature range.
⢠VIN Range: 2.7V to 5.5V
⢠5V Regulated Output Voltage
⢠Two Adjustable Regulated Output Voltages:
VPOS and VNEG
â Positive Charge Pump Up to +25V
â Negative Charge Pump Down to -25V
â 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
⢠Temperature Range: -40°C to +85°C
Applications
⢠CCD Cameras
⢠Hand-Held Instruments
⢠Passive-Matrix Displays
⢠Personal Digital Assistants (PDAs)
⢠TFT Active-Matrix LCDs
Typical Application
CFLY
VIN
VNEG
C+
C-
IN
EN
CIN
EN/PN
DRVN
OUT
COUT
AAT2820
FBN
REF
DRVP
GND FBP
Enable
Enable (Positive and
Negative Output)
VOUT
VPOS
2820.2006.04.1.4
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