AAT3244
300mA Adjustable Dual CMOS
Low Voltage LDO Linear Regulator
™
PowerLinear
General Description
Features
The AAT3244 is a dual, low input voltage, low
dropout (LDO) linear regulator with two Power OK
(POK) outputs. Two integrated regulators provide
high power outputs of 300mA from an input voltage
range of 1.8V to 5.5V.
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Low Input Voltage
— 1.8V to 5.5V
Ultra-Low Adjustable Output Voltage
— 3.6V to 0.6V
High Output Current
— 300mA per LDO
Two POK pins provide open drain signals when
their respective regulator is within regulation. The
AAT3244 has independent voltage inputs and
enable pins for increased design flexibility. The
device features a very low quiescent current (typi-
cally 85µA) and low dropout voltages (200mV at
full load), making it ideal for portable applications
where battery life is critical.
Low Dropout Voltage
— Typ 200mV @ 300mA
Low 85µA Quiescent Current (Both LDOs On)
High Output Accuracy: 1.5ꢀ
Independent Input Supply and Enable Pins
Over-Temperature Protection
12-Pin TSOPJW Package
-40°C to +85°C Temperature Range
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The AAT3244 is available in a space-saving, Pb-free
12-pin TSOPJW package and is capable of opera-
tion over the -40°C to +85°C temperature range.
Applications
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Cellular Phones
Digital Cameras
Handheld Instruments
Microprocessor/DSP Core/IO Power
PDAs and Handheld Computers
Typical Application
V
IN = 3.6V
VOUTA = 1.8V
VCC
INA
OUTA
FBA
100kΩ
118kΩ
59kΩ
Enable A
ENA
POKA
POKA
OUTB
INB
VOUTB = 3.3V
2.2μF
267kΩ
CIN
100kΩ
1μF
POKB
FBB
POKB
Enable B
ENB
2.2μF
59kΩ
GND
GND
3244.2007.08.1.1
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